Introduction: Since the implementation of GB/t 38470-2019"raw materials for recycled brass" , GB/t 38471-2019"raw materials for recycled copper" and GB/t 38472-2019"raw materials for recycled cast aluminum alloy" , production, use, trade enterprises and regulatory authorities on the understanding of the standard there are some inconsistencies. In response to various questions, the reply is summarized as follows.

1. How are standards positioned, and what is the object of standardization? A: "recycled copper raw materials" "recycled brass raw materials" "recycled aluminum alloy raw materials" are high quality recycled materials for direct melting/melting, is containing copper or aluminum waste after sorting, processing, treatment of clean high-quality products, so positioning as raw material product standards. 

2. Circular No. 43 of 2020 of the Ministry of Ecology and environment, the General Administration of Customs, the Ministry of Commerce and the Ministry of Industry and Information Technology of the People's Republic of China, "announcement on regulating the administration of the import of recycled brass raw materials, recycled copper raw materials and recycled cast aluminum alloy raw materials, " clearly stipulates that the import of those materials that do not meet the requirements of the three standards shall be prohibited, however, it is not clear whether solid waste does not meet the three criteria. What do you mean? A: Notice No. 43 clearly prohibits the import of solid waste that does not meet the requirements of the three criteria, except for those that have obtained a permit for solid waste that can be used as raw material. According to the definitions of "recycled brass raw material" , "recycled copper raw material" and "recycled casting aluminum alloy raw material" in the three standards, the recycled metal raw material must be a product that has been effectively sorted or pretreated, and it has the characteristics of direct production and utilization. Recycled materials that are not effectively separated or pre-treated and that require further treatment in the country for use do not meet the definition of recycled materials in the three standards and are considered nonconforming. Whether it belongs to solid waste should be identified in accordance with the provisions of the law of the People's Republic of China on the prevention and control of environmental pollution by solid waste and the guidelines of GB 34330-2017 -- General Rules for identification of solid waste.

3. There are many technical requirements and inspection items in the standards of recycled copper raw material and recycled brass raw material, which are the inspection items of high quality raw material? A: The two national standards are applicable to the recovery and separation of raw materials at home and abroad. The standards have been prepared taking into account the international and domestic markets, the trade needs of both the supply and demand sides, and the requirements of the users, at the same time, taking into account the requirements of Customs Inspection, during the implementation of the standards, test items can be divided into: key items for high quality raw materials: apparent characteristics, inclusions, radioactive contamination, other requirements (standard 5.5 hazardous substances) , copper (Copper Alloy) quantity; General Program: total metal, moisture, metal recovery, fracture organization, marking, packaging, transportation, storage and quality certification.

 4. The three standards, GB/t 38470-2019, GB/t 38471-2019 and Gb/t 38472-2019, do not specify the specific limits of non-conformity of the apparent characteristics, such as a small number of non-conformity, whether it is directly judged as non-conformity? In GB/t 38470-2019 and Gb/t 38471-2019,7.6.3"if any of the apparent characteristics, radioactive contamination, or other requirements of the test result are not in conformity with the requirements of this standard, the batch of raw materials shall be judged not to be in conformity with the provisions of this standard" , "apparent characteristics" do not meet the requirements, is directly judged to be unqualified. GB/T 38472-2019, 7.4.1"if any of the samples fails in the visual examination, a double number of samples shall be taken from the lot and repeated tests shall be conducted. Repeated tests, the results are all qualified, the batch of raw materials qualified, otherwise the batch does not meet the provisions of this standard. A small number of apparent features and how to grasp the scale, by the customs in accordance with existing regulations, such as from the perspective of environmental control requirements for screening. If the visual estimation of inclusion is not up to standard, inspection shall be carried out. 

5. The three standards do not cover all recycled copper and aluminum. What should be done with high quality recycled copper and aluminum materials that are not covered by the three standards? For example, GB/t 38470-2019 is for brass alloys and GB/t 38471-2019 is for pure copper. But in addition to pure copper (red copper) , brass, there are nickel-containing bronze alloys and copper alloys. If a company imports old propeller, the composition is CU1(grade 1 manganese bronze) , CU2(grade 2 nickel manganese bronze) , CU3(grade 3 nickel aluminum bronze) , CU4(grade 4 manganese aluminum bronze) , any of the copper alloy, are bronze alloy, not brass alloy. A: due to the time constraints of the standard-setting process and the lack of data for some high-quality raw materials, all three national standards have not been incorporated. From the composition of the single old propeller imported by a certain company, all copper alloys of any kind, whether CU1(grade 1 manganese bronze) , CU2(grade 2 nickel manganese bronze) , CU3(grade 3 nickel aluminum bronze) , CU4(grade 4 manganese aluminum bronze) , are bronze alloys, it's not brass. Does not comply with GB/t 38470-2019"recycled brass raw materials, " the "zinc content needs to be greater than the copper other than the content of a single metal element. Therefore, the single old propeller is not suitable for GB/t 38470-2019 national standard of recycled brass raw materials. Considering the efficient use of strategic metal resources, it is recommended to refer to the key items in question 3 that reflect high-quality raw materials if they meet the environmental requirements of the port, declaration of bronze and cupronickel alloys not covered by the standard after examination or new code, of course, it is best to first obtain the intention of the customs clearance port. The next step is to revise standards to regulate the recycling of other high-quality recycled copper and aluminum materials.

6. The declared name is recycled copper, the appearance is in line with No. 2 copper, the composition is copper-tin alloy, the copper content is 94.2% , the tin content is 5.47% , the other items are all qualified, the surface is very clean (as shown below) , but the copper content is slightly less than the requirement of No. 3 copper not less than 96% , but more than 3 copper rice not less than 94% of the requirements, how to determine?

Answer: from the composition and the picture, this raw material is tin bronze, is the processing surplus material. This situation is similar to question 5. It is recommended that the declaration be made after inspection or addition of codes, taking into account the key items in question 3 that represent high-quality raw materials.

1. Standard Interpretation 1. Apparent characteristics and sources of copper scrap not included in raw materials for recycled copper in GB/t 38470-2019: enamelled wire, due to the organic coating on the surface, during smelting, volatile air pollution, does not meet the requirements of high-quality raw materials, the amount of mixed should not exceed 5% of the total amount of raw materials. Copper chips, because in the process contains a large number of cutting oil, cutting fluid, in the smelting process, will volatile environmental pollution of the gas, does not meet the requirements of high-quality raw materials, should not be mixed into any kind of raw materials. Copper Water tank, because it contains water or a lot of sludge, or PB, SN and other heavy metals, and PB has environmental pollution, does not meet the requirements of high-quality raw materials, should not be mixed into any kind of raw materials. 

2, GB/t 38471-2019"recycled brass raw materials" not included in the recycled brass raw materials of copper scrap apparent characteristics and sources: brass water meter shell, due to a large number of paint on the surface, in the smelting process, volatile air pollution, does not meet the requirements of high-quality raw materials, the amount of mixed should not exceed 5% of the total amount of raw materials. If there is no paint on the surface, it can be classified as mixed brass. Brass water tank contains water or a lot of sludge, or PB, SN and other heavy metals, and PB has environmental pollution effect, does not meet the requirements of high quality raw materials, should not be mixed into any kind of raw materials. 3. What is recycled copper, what are recycled brass materials, and how do they come about? A: recycled copper (brass) raw material is recovered copper (or brass) or its mixed metal after disassembling, crushing, sorting, processing, to meet the requirements of this standard can be used directly in the production of raw materials. Disassembly refers to the separation from the system, such as the separation of valves from buildings, the separation of wires from electricity, the separation of copper-containing components from electrical appliances; fragmentation refers to the further separation of copper-containing components from disassembly, such as removing glass and ceramics from failed valves, removing insulation from wires, removing plastics, wood, ceramics and other inclusions from copper parts; sorting refers to the removal of copper and brass parts from dismantled and broken materials, as the principle of separation is based on copper composition, the physical shape and specifications of the material after separation are not consistent.

"recycled copper raw material" and "recycled brass raw material" are high-quality recycled materials which can be used directly. "Copper and Copper Alloy Scrap" is also waste material which needs to be pre-treated or disassembled, but the content of inclusions, water, oil and non-copper metals is too high to be used directly, and it is basically returned to the refining process. 2) the principle of distinguishing raw materials from waste materials is: A) the raw materials are obtained by physical or chemical pretreatment of copper-containing recyclables, such as the plastic insulation skin on the surface of the stripped wire and cable; b) The inclusion, radioactive contamination, total metal content and copper content of raw materials are far more stringent than those of waste materials; c) the waste materials, even after proper classification, are mostly mixed materials, and the raw materials show better uniformity in physical and chemical properties. 5. Methods of chemical composition detection for Gb/t 38470-2019 and Gb/t 38471-2019. According to the standard, Gb/t 5121.1"methods for chemical analysis of copper and copper alloys -- Part 1, determination of copper content" was chosen as the arbitration method, YS/t 482(direct reading spectrometry) and YS/T 483(xrf spectrometry) as the screening method. GB/T 5121.1 includes three methods for the determination of copper: All involve the use of electrolytic devices, which may cause inconvenience to some laboratories in the detection of equipment, and the detection time is longer. YS/T 482(direct-reading spectroscopy) and YS/t 483(x-ray fluorescence spectroscopy) are relatively fast, but their accuracy is not good. Can Alternative methods be used? A: Impurity elements can be measured using GBT 5121.27-2008 methods of chemical analysis of copper and copper alloys part 27: Inductively coupled plasma atomic emission spectroscopy, and the copper content can be obtained by calculating the allowance. YS/T 521.1"methods for chemical analysis of crude copper-part 1: determination of copper content, iodometric method" can also be used for the determination of copper content by chemical titration. Some applicable methodological standards may be added to the next revision. 6. The test items of copper content, copper content in GB/t 38470-2019 and GB/t 38471-2019 and Gb/t 38470-2019, as well as the lead content in Gb/t 38470-2019, are difficult to obtain the sample data directly in the field. How should they be operated in practice? Answer: Metal Copper quantity is obtained by weighing method in the spot, the method is simple. The copper content and the lead content, the chemical composition of the material, are to be tested in the laboratory. On-site with the help of Portable XRF or portable spectrometer, if there is a problem, then sent to the laboratory testing to determine. 7. In the determination of copper content, it is necessary to select metal copper and copper alloy by hand, but it is difficult to distinguish metal copper or copper alloy from other metals by appearance, so it is difficult to select by hand, and there are some problems in the determination of copper content. How do you fix it? A: The determination of copper content requires sampling, sample preparation, sample pretreatment before melting, as far as possible to pick out inclusions and non-copper metals, even if not completely, melting process is also carried out slag, no impact on the determination of copper content. In addition, if the testing laboratory does not have a sample of high-quality samples in accordance with the standard, the quality of the sample can be reduced to the degree acceptable to the laboratory for further testing of the sample. Group batch problem, the current enterprise and customs understanding of the group batch is inconsistent, how to determine the group batch? Answer: In the three national standards, "group Batch" means "group inspection batch" , which is suitable for the inspection of raw material recovery and separation at home and abroad. The customs applies the environmental protection clause applicable to the control of the port to conduct on-the-spot examination of the attributes of solid waste from the customs point of view. If there is any objection to the examination, it will be identified. In view of the split of the waybill and the problems in the actual operation, it is suggested that the customs take samples for examination in accordance with the existing customs rules. 9. Does the same lot accept partial shipment? Does the definition of "different types of bulk materials should not be mixed" mean that different types of bulk materials should not be mixed? A: the same batch of raw materials should be the same batch of transport. Do not mix the object only refers to different types of bulk raw materials, not including the raw materials with independent packaging, but the same independent packaging unit is not allowed to mix. 10, in practice, some of the recycled metal raw materials coming into the port are a mixture of various parts and materials, the appearance of great difference, how to declare? How? A: The customs applies the environmental protection provisions applicable to the control of ports to conduct on-site inspection of the properties of solid waste from the customs point of view. For the recycled raw materials that meet the environmental protection requirements, the requirements of "each batch shall consist of the same name or code" as set out in three standards (article 7.3 of Gb/t 38470-2019, Article 7.3 of Gb/t 38471-2019 and article 7.2 of Gb/t 38472-2019) are strictly enforced. For example, when importing recycled copper raw material, it must declare according to Gb/t 38471-2019"table 2 raw material appearance characteristic and source" of the specification name, according to its request to carry on the appearance characteristic conformity inspection to the goods. If "the composition, specifications and sources of the same container are obviously from different raw materials" depends on whether it conforms to "mixed brass" or "copper processed materials" , the following treatment shall be carried out according to 7.3 of Gb/t 38470-2019 and 7.3 of GB/t 38471-2019 in combination with table 2 of the standard. 11. The standard requires that the inclusion and the powder (dust, sludge, crystal salt, metal oxide, fiber end, etc.) with the particle size not more than 2 mm should not be more than 0.1% , and the non-metal inclusion should be less than 1% . It is difficult to detect inclusions and powder in practice. How To solve this problem? A: The inspection cited SNT 1791.9-2018, part 9: Waste Non-ferrous metal, which has been in operation for more than 20 years from promulgation to revision. In the actual inspection, the customs may first judge the inclusion content on the spot by means of visual inspection and touching. If the inclusion is suspected to be not up to standard, it shall be sent to sieving for examination and appraisal, and if there is any objection to the appraisal result, it shall be submitted to arbitration. How to deal with the relationship between the standards of recycled copper and aluminum and GB 16487.7-2017 environmental protection control standards for imported solid waste usable as raw materials-waste Non-ferrous metal? A: GB 16487.7-2017 has been abolished and implemented in accordance with the newly formulated standards. 13. What should be done if the goods are found to contain inclusions, bullets, excessive radiation, etc. ? A: It is suggested that such cases be treated as non-conforming returns or as required by the relevant regulatory authorities. 14, cargo mixed with waste circuit boards, electronic components containing hazardous substances, etc. , whether according to the General Inclusion Treatment? A: In accordance with standard 5.5.2"the raw materials are prohibited to be mixed with closed containers, pressure containers, national regulations of hazardous substances"implementation. 15, cargo mixed with oil, whether it can be treated as hazardous waste, that cargo mixed with hazardous waste, does not meet the standard requirements? A: The "engine oil" mixed into the cargo is a dangerous substance stipulated by national laws and regulations, it does not meet the requirements of standard 5.5.2. 16, GB/t 38470-2019, GB/t 38471-2019 on the packaging, transport, storage and quality certificate of goods have clear provisions, the current imported products are not in line with the provisions, whether to determine whether the goods do not meet the requirements of Gb/t 38470-2019 or Gb/t 38471-2019 standards? Or would you like to clarify this for the industry? A: The "marking, packing, transportation, storage and quality certificate" clause in the standard is a format requirement based on national product standards. It is applicable to both the supplier and the demander, not a necessary requirement. "signs, packaging, transportation, storage and quality certificates" can be ignored if they meet the environmental requirements of the control point.

2.Question 17 on Gb/t 38470-2019"raw materials for recycled brass" , the unsorted sundries as shown in the figure below, before the customs were imported as "solid waste which can be used as raw materials" , how to determine at present?

DESCRIPTION: performance characteristics: by the brass casting, or service failure of the casting, rolling, steel products and other hybrid composition. MIXED BRASS RCUZN-4C A: This picture is from the standard picture, which shows the raw materials mainly from the service failure of various parts, so the physical shapes are diverse, but are all brass class. The ingredients of this kind of raw materials which have been effectively separated or pretreated meet the requirements of the standards. The content of copper and zinc is very high. When put directly into the furnace, there is no need to add additional new metal materials such as lead. They are high quality raw materials that meet the requirements of the standards, therefore, RCuZn-4C mixture of brass in Gb/t 38470-2019 is included. It is estimated that about 28% of the low-quality recycled brass raw materials previously imported as "solid waste usable as feedstock" do not meet the requirements of Gb/t 38470-2019 and can not be imported. 18. For the "5.3 inclusion content, moisture content, total metal content and total metal brass content" clause, the quality of the raw materials containing the coating shall not be greater than 5% of the total raw material quality, 1) what weight ratio does 5% refer to? 2) how to test the quality ratio of coating materials in practice? 3) from all kinds of valves, water meters and other parts of the mixed brass most of the coating or coating, how to determine the material? A: 1)5% means that the weight of coated materials does not exceed 5% of the total weight of materials; 2) the specific testing method should be in accordance with the standard 6.3.4 test; 3) from all kinds of valves, water meters and other components of the mixed brass most of the coating or coating, the coating surface is generally nickel, tin, zinc, aluminum, chromium metal, the subsequent use of no impact on the environment, but the surface of the organic coating in the melting process of gas pollution of the environment. In order to ensure the high quality of raw materials, if the coated raw materials are more than 5% of the total quality of raw materials, should be ordered not to import non-conforming requirements, in order to prevent environmental pollution. As shown in the following figure of the material coating material weight far more than 5% , the material does not meet the requirements, unqualified return.

DESCRIPTION: performance characteristics: by the brass casting, or service failure of the casting, rolling, steel products and other hybrid composition. MIXED BRASS RCUZN-4C A: This picture is from the standard picture, which shows the raw materials mainly from the service failure of various parts, so the physical shapes are diverse, but are all brass class. The ingredients of this kind of raw materials which have been effectively separated or pretreated meet the requirements of the standards. The content of copper and zinc is very high. When put directly into the furnace, there is no need to add additional new metal materials such as lead. They are high quality raw materials that meet the requirements of the standards, therefore, RCuZn-4C mixture of brass in Gb/t 38470-2019 is included. It is estimated that about 28% of the low-quality recycled brass raw materials previously imported as "solid waste usable as feedstock" do not meet the requirements of Gb/t 38470-2019 and can not be imported. 18. For the "5.3 inclusion content, moisture content, total metal content and total metal brass content" clause, the quality of the raw materials containing the coating shall not be greater than 5% of the total raw material quality, 1) what weight ratio does 5% refer to? 2) how to test the quality ratio of coating materials in practice? 3) from all kinds of valves, water meters and other parts of the mixed brass most of the coating or coating, how to determine the material? A: 1)5% means that the weight of coated materials does not exceed 5% of the total weight of materials; 2) the specific testing method should be in accordance with the standard 6.3.4 test; 3) from all kinds of valves, water meters and other components of the mixed brass most of the coating or coating, the coating surface is generally nickel, tin, zinc, aluminum, chromium metal, the subsequent use of no impact on the environment, but the surface of the organic coating in the melting process of gas pollution of the environment. In order to ensure the high quality of raw materials, if the coated raw materials are more than 5% of the total quality of raw materials, should be ordered not to import non-conforming requirements, in order to prevent environmental pollution. As shown in the following figure of the material coating material weight far more than 5% , the material does not meet the requirements, unqualified return.

19. In the standard "6.3.4 coating" is under the "6.3 inclusion" column. Is Coating included in the inclusion category? A: "coating" and "inclusion" are two inspection items. In Chapter 5 of the standard, "coating" is specified as a footnote without separate items. In chapter 6 of the standard, in the order of inspection, "coating" is included under the "6.3 inclusions" column. The columns shall be adjusted in the next revision of the standard. 20. The material containing the marking color, as shown below, is a coating material. How?

Answer: According to the standard, the weight of the raw material with coating should not exceed 5% of the total weight of the raw material. The direct judgment of the over-weight of the raw material with coating is not up to the requirements and is not up to the standard, those who fail to meet the appraisal requirements shall be deemed to be unqualified. 21. As shown below, some of the materials declared as "mixed brass" are a mixture of undismantled taps, valves and other parts, in which plastic parts, iron parts and other parts are not brass. How?

Answer: According to the standard request is should dismantle completely, should choose completely. Among them, the undismantled plastic integral parts are judged by "inclusion" in the standard, and the undismantled iron integral parts are calculated by "non-copper metal" in the standard, and the difference of "metal brass quantity" is reduced, and according to GB/t 38470-2019"recycled brass raw material" requirements for the judgment. 22. The No. 1 brass chip in the standard is composed of processed brass chips and does not contain filings and abrasives. In practice, how to distinguish between filings and abrasive debris and processed debris? A: you can tell by the size of the particles. The particles of the chip-cutting material are large or of a certain length. Filings particles are very small, water or oil content is too large, not easy to clean, and into the furnace burning seriously.

Answer: According to the standard, brass has chip material, red copper has no chip material item. Although it has a high copper content, it generally contains more oil and sundries, and does not meet the requirements of high-quality recycled copper raw materials. 26, some recycled copper, broken copper is made of copper and other metal materials (such as aluminum) together, handpicked can not be separated, also can not be broken after mechanical separation, so can not respectively quantitative, how to determine?

Answer: to this kind of inlay metal that can not be separated, when checking"metallic copper amount", calculate according to"non-copper metal"on the whole.

Answer: In GB/t 38471-2019 Standard, the apparent characteristic of "No. 1 copper wire" stipulates that "oxidation is allowed on the surface" . The raw material of oxidized copper wire has no influence on subsequent utilization and environment. 29,2 copper material containing surface coating, as shown in the following figure, how to determine?

Answer: Gb/t 38471-2019"No. 2 copper" in the apparent characteristics of the provisions of "allow the surface coating" , the surface coating generally includes nickel, tin, zinc, aluminum, chromium and other metals, no impact on the subsequent use and the environment. The sensory judgment and inspection results of typical material legend are shown in the table below

Liquid aluminium is used for casting aluminium alloy ingots (or castings) , or for casting/spray forming wrought aluminium and aluminium alloy ingots/aluminium and aluminium alloy powder, or for casting/extrusion of wrought aluminium and aluminium alloy products such as aluminium plates/strips/bars/tubes. Casting aluminum alloy ingots are usually made by remelting, casting and heat treatment. Casting aluminum alloy ingots can also be cut into certain shape for direct use. Wrought aluminum and aluminum alloy ingots are usually rolled, extruded, stretched, forged, spun and heat treated to form aluminum sheets, strips, foils, tubes, bars, shapes, wires, forgings, etc. . Cast Aluminum Alloy Ingots (or castings) , deformed aluminum and aluminum alloy ingots are cast in microstructure, coarse grains, low toughness and fatigue resistance. Casting aluminum alloy ingots (or castings) do not need to bear subsequent pressure processing deformation, product performance requirements and deformation of aluminum and aluminum alloys are also different, the control level of impurity elements and other alloy elements is not as strict as that of wrought aluminum and aluminum alloy ingots. Therefore, the requirements of the quality of raw materials for casting aluminum alloy ingots are not as strict as those for wrought aluminum and aluminum alloy ingots. Can Be used for deformation of aluminum and aluminum alloy ingots, also can be used for casting aluminum alloy ingots. Due to the subsequent deformation of wrought aluminum and aluminum alloy ingots, in order to prevent the formation of compounds or phase structures that are harmful to plastic deformation and affect the properties of products (strength, corrosion resistance, conductivity, flexibility, fatigue resistance, etc.) , the composition of wrought aluminum and aluminum alloy ingots is strictly required, impurity element content must be controlled to a very low level, other alloy element content must also be strictly controlled within a certain range, high or low! Therefore, the deformation of aluminum and aluminum alloy ingot on its raw material quality requirements are extremely strict. By adjusting the kinds and contents of elements added in liquid aluminum, and adjusting the production process, aluminum products of different quality and suitable for different application requirements can be obtained. The flow diagram of the production and use of recycled aluminum raw material is shown in Fig. 1-1.

Second, "recycled casting aluminum alloy raw materials" Standard Analysis 1, question: The typical standards of recycled casting aluminum alloy raw materials mainly include? Answer: this standard through the actual investigation and analysis, the inclusion content situation and the metal recovery rate, as well as the remelting slagging and the waste gas discharge situation, clear the following after separation, processing, pretreatment, to obtain the raw material of recasting aluminum alloy which can be directly put into the furnace. (1) scrap aluminium alloy sheets and pure aluminium raw materials without organic coating and composite materials, such as Fig. 2-1, Fig. 2-2 and Fig. 2-3, wrought aluminum products with magnesium, silicon, copper, manganese and zinc as the main alloying elements, such as aluminum doors and windows, aircraft aluminum plates and aluminum tubes without organic coating on their surfaces, as well as pure aluminum bare wires and conducting bus wires, etc. , it can be used in the production of cast aluminum alloy if it meets the requirement of aluminum block after simple separation. However, this kind of raw material is of good quality, and is more suitable for use as raw material of recycled pure aluminum or recycled wrought aluminum alloy.

(2) clean waste aluminum castings, cast aluminum alloy products or products with silicon, copper, magnesium and zinc as main alloying elements, such as figure 2-4 can be regenerated as raw materials for casting aluminum alloy.

(3) recycled aluminum ingot, using recycled aluminum ingot, such as figure 2-5 can be used as recycled casting aluminum alloy raw materials.

Question 6: The Mix of wrought aluminum, the majority of the cargo on site is a mixture of wrought aluminum and cast aluminum. Can it be determined from the source that it has not been decomposed? The site also received 100% deformed aluminum goods, should not be in Gb/t 38472-2019 standard scope, how to determine? What should I do if some aluminium parts which are not raw materials of recycled casting aluminium alloy are mixed into the cargo? Answer: "the source of raw material" only indicates the possible source of all kinds of raw material for recycled casting aluminum alloy, not the technical requirement. The broken pieces of wrought aluminum alloy belong to the category of aluminum blocks, which can be used as raw materials of recycled casting aluminum alloy. However, the mixed cargo of wrought aluminum and cast aluminum can not be used as raw materials of recycled wrought aluminum alloy. "100% deformed aluminum" can be judged according to the newly established standard of "recycled deformed aluminum alloy raw materials" , or according to Gb/t 38472-2019. If some aluminium parts which are not the raw materials of recycled casting aluminium alloy are mixed into the goods, if the items inspected according to Gb/t 38472-2019 are all in conformity with the regulations, the raw materials shall be deemed to be qualified. Q: What about heat insulation profiles and aluminum with organic coatings? A: A small quantity of mixed coated aluminum or heat-insulated profiles is allowed, but if the excessive mixing results in the unqualified quality of the volatiles and/or inclusions in the goods, the goods shall be judged to be unqualified.

Q: What about the aluminum cans? A: A small amount of coated aluminum cans is allowed in the shipment, but the shipment shall be disqualified if excessive mixing results in the nonconforming quality of the volatiles and/or inclusions in the shipment.

Q: What about scrap aluminum castings with heavy inclusions? A: It is allowed to mix a small amount of heavy waste aluminum casting with the goods, but if the excessive mixing results in the unqualified quality of volatiles and/or inclusions in the goods, the goods should be judged to be unqualified.

10. Question: What about the aluminum scraps? Answer: Aluminum scraps in the production and recovery process easy to entrainment inclusions, easy to burn in the remelting process slag, does not belong to high-quality raw materials. These include "aluminium blocks" , which add volatile binders to crush bits of aluminium into blocks, and are not high-quality raw materials. It is planned to develop the standard of recycling, which will provide the standard basis for the recycling of aluminum scraps. A small amount of aluminum dust is allowed to be mixed in the goods, but if the excessive mixing results in the unqualified quality of the volatiles and/or inclusions of the goods, the goods shall be disqualified.

Q: What about coated or rimmed wheels, air nozzles, lead, etc. ? A: occasionally, the wheel hub is coated or inlaid with materials such as iron ring, air nozzle, lead, etc. . However, if the wheel hub is coated or not disassembled clean, resulting in the overall inclusion of the goods unqualified, the goods should be judged unqualified.

13. What happens to goods whose chemical composition does not meet the requirements of the standard for recycled aluminium raw materials? A: If the chemical composition is found to be non-aluminium material, it is suggested that the two parties should negotiate and deal with it otherwise. The chemical composition of raw materials belongs to the general inspection items. In the future, after the revision of GB/t 38472-2019"raw materials for recycled casting aluminum alloy" , the chemical composition of raw materials as a reference index will be moved to the content of "in-plant inspection and acceptance" . Question 14: What should be done to deal with serious flash and BLOWHOLE ON RECYCLED ALUMINUM INGOTS? A: There are serious flanges and air holes in the declared quality of the remanufactured aluminum ingots. Usually, there are serious inclusions in the ingots. If the quality of the remanufactured aluminum ingots can not be judged by the quality of the remanufactured aluminum ingots, and the quality of the remanufactured aluminum ingots is in doubt, the fracture structure of the reclaimed aluminum ingot should be examined.

Source: Copper Aluminum