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Similar standardsGB/T 38470-2019: Recycling materials for brass---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38470-2019GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.150.30 H 62 Recycling materials for brass Issued on: DECEMBER 31, 2019 Implemented on: JULY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 4 4 Classification... 7 5 Technical requirements... 7 6 Test methods... 11 7 Inspection rules... 14 8 Marking, packaging, transportation, storage and quality certificate... 16 9 Order form (or contract) content... 17 Appendix A (Informative) Typical photos of recycling materials for brass... 18 Appendix B (Informative) Inspection methods of radioactive contaminants... 22 Appendix C (Normative) Testing method of moisture content... 28 Appendix D (Normative) Preparation of chemical composition sample and testing method of metal recycling rate... 30 Appendix E (Informative) Inspection process of recycling materials for brass 32 Bibliography... 33 Recycling materials for brass1 ScopeThis Standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, quality certificate and order form (or contract) content of recycling materials for brass (hereinafter referred to as materials). This Standard applies to brass materials and their recycling and domestic and foreign trade in the field of circulation.2 Normative referencesThe following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 5121 (all parts) Methods for chemical analysis of copper and copper alloys GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values YS/T 482 Methods for analysis of copper and copper alloys - The atomic emission spectrometry YS/T 483 Methods for analysis of copper and copper alloys - X-Ray fluorescence spectrometric (wavelength dispersive)3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Recycling materials for brass material is 0.5 kg; the mass of moisture is 0.2 kg; the mass of non-copper metals such as aluminum and iron is 2 kg; the mass of copper and copper alloy is 97.3 kg; then the metal brass content is 97.3%. 3.7 Total metal content The amount of metal (including metal brass and non-copper metal) per unit mass of representative sample after removal of foreign material and moisture, expressed as a percentage. Note. For example, extract 100 kg of representative sample; of which, the mass of foreign material is 0.5 kg; the mass of moisture is 0.2 kg; the mass of non-copper metals such as aluminum and iron is 2 kg; the mass of copper and copper alloy is 97.3 kg; then the total metal content is 99.3%. 3.8 Coating material The material coated on the surface of the materials. Note. Coating material generally includes identification paint, anti-rust paint, insulating layer, etc. 3.9 Plating material The material plated on the surface of the materials. Note. Plating material generally includes nickel, tin, zinc, aluminum, chromium, etc. 3.10 Chemical composition sample The sample which is directly extracted from the materials or prepared after melting for detecting the content of copper and other elements. 3.11 Metal recycling rate The ratio OF the mass of the ingot, obtained after pretreatment, melting and solidification of a unit mass of representative sample, TO the mass of the original representative sample, expressed as a percentage. The inspection of metal recycling rate of the materials shall be carried out in accordance with Appendix D. 6.8 Other requirements Other requirements of the materials are inspected by sensory organs.7 Inspection rules7.1 Inspection process Refer to Appendix E for the inspection process of the materials. 7.2 Inspection and acceptance The purchaser shall inspect the received materials in accordance with the provisions of this Standard. If the inspection result is not in conformity with the provisions of this Standard and the order form (or contract), it shall be submitted to the supplier in written form; the supplier and the purchaser shall negotiate and resolve. If arbitration is required, it shall be negotiated between the supplier and the purchaser. 7.3 Lot grouping The materials shall, in lots, be submitted for acceptance. Each lot shall be composed of the materials with the same name or code. The lot weight shall not exceed 50 t. 7.4 Inspection items The apparent characteristics, radioactive contaminants, foreign material content, moisture content, total metal content, and metal brass content of each lot of the materials shall be inspected. When necessary, the chemical composition and metal recycling rate shall also be inspected. 7.5 Sampling The sampling of the materials shall meet the requirements of Table 5. materials does not meet the requirements of this Standard.8 Marking, packaging, transportation, storage andquality certificate 8.1 Marking Each lot of the materials shall be accompanied by a label indicating. a) Supplier name; b) Material name; c) Material code; d) Lot number; e) Total weight; f) Net weight; g) Number of this Standard; h) Others. 8.2 Packaging The materials can be packaged in bulk, packaged, or pressed, etc. The packaging method, size and mass shall be negotiated and determined by both the supplier and the purchaser. 8.3 Transportation and storage 8.3.1 During transportation, different categories of bulk materials shall not be mixed. 8.3.2 The transportation and storage of the materials shall be protected from rain and snow. 8.4 Quality certificate Each lot of the materials shall be accompanied by a quality certificate, which indicates. a) Supplier name;Appendix B(Informative) Inspection methods of radioactive contaminants B.1 Inspection instrument The inspection instrument shall meet the requirements of GB 18871, GB/T 12162.3 and GB/T 5202. B.2 Measurement of external irradiation penetrating radiation dose rate B.2.1 Measurement of natural environmental radiation background value B.2.1.1 Before the measurement of external irradiation penetrating radiation dose rate, the local natural environmental radiation background value shall be measured and determined first. B.2.1.2 Choose 3~5 points (which can be used as fixed survey points) on the flat open ground, which can represent the local normal natural radiation background state and have no radioactive contamination, as the measuring points. B.2.1.3 PLACE the measuring probe of the measuring instrument at a height of 1 m from the ground above the measuring point; determine its external irradiation penetrating radiation dose rate. The measured value is read once every 10 s. The average of the 10 readings is taken as the measured value at this point. USE the arithmetic mean of the measured values of each measuring point as the average of normal natural radiation. B.2.2 Tour testing B.2.2.1 Before the materials pass through the port channel, they shall be subjected to the tour testing of radioactive contamination. During the tour testing, the measuring instrument shall be as close as possible to the surface of the measured object or the surface of the container, car body, warehouse body, etc. loaded with the materials. The peripheral surface of the measured object shall be tour-tested. B.2.2.2 During the tour testing, when it is found that the radioactivity has obviously exceeded the management limits of three detection indicators, it is judged as nonconformity. When the radioactive contamination has been found to exceed the management limits of three detection indicators, no sub- Dሶ - The corrected measured value of the measuring instrument, in microGy per hour (μGy/h); K1 - The scale factor of measuring instrument (given by the instrument's verification certificate); Kη - The efficiency factor of measuring instrument; Dሶ c - The measured value reading of measuring instrument, in microGy per hour (μGy/h). B.3 Inspection of α, β surface contamination B.3.1 Testing requirements In general, the tour testing and point measurement of α and β surface contamination level shall be carried out at the same time as the measurement of external irradiation penetrating radiation dose rate. If necessary, the tour testing and point measurement of this item can also be carried out separately. B.3.2 Arrangement of test points For the detection of α and β surface contamination levels, the test points shall be arranged in accordance with B.2.3.The measurement area shall be greater than 300 cm2. B.3.3 Efficiency determination of α surface contamination meter B.3.3.1 USE α surface contamination meter to measure the count N0,α of the natural environmental radiation background 10 min. B.3.3.2 Measure the check source of the instrument for 5 min and obtain the count N1,α. B.3.3.3 Reverse the instrument probe by 180° and measure it for 5 min, to obtain the count N2,α of the check source (considering the unevenness of the plane source). B.3.3.4 According to formula (B.3), calculate the efficiency factor η4π(α) of the instrument. Where. η4π(α) - The efficiency factor of α surface radiation contamination meter;Appendix C(Normative) Testing method of moisture content C.1 Scope This appendix specifies the testing method for the moisture content of the materials. This appendix applies to the testing of the moisture content of the materials. C.2 Method summary USE alcohol and clear water to clean the sample; HEAT to a fixed temperature and keep to a constant weight. The mass loss is measured, to calculate the moisture content. C.3 Reagents or materials C.3.1 Industrial alcohol; the mass fraction of ethanol is not less than 95%. C.3.2 Water. Grade 2 water specified in GB/T 6682. C.4 Apparatus C.4.1 Drying oven. The temperature control range is 105 °C±5 °C. C.4.2 Drying disc. C.4.3 Electronic scale. The accuracy is 0.01 g. C.5 Sampling In each inspection lot, take 2 representative samples of the materials. The mass of each representative sample is not less than 1.0 kg. C.6 Test procedure C.6.1 After the drying disc has a constant weight at 105 °C, it is placed in a drying oven and cooled to room temperature. The mass is weighed and recorded as m6. C.6.2 PUT the representative sample into the drying disc and spread it flat; WEIGH the mass of the drying disc with the sample and record it as m7.Appendix D(Normative) Preparation of chemical composition sample and testing method of metal recycling rate D.1 Scope This appendix specifies the preparation method of chemical composition sample and the testing method of material metal recycling rate. This appendix applies to the preparation of chemical composition sample and testing of metal recycling rate. D.2 Method summary TAKE representative samples of the materials; after pretreatment, put them into the melting furnace; fully melt and clear the slag; prepare chemical composition samples. After the melt is solidified, the ratio of the mass of the obtained ingot to the mass of the sample is the metal recycling rate. D.3 Reagents or materials Melting covering agents and slag cleaning agents (such as charcoal, salt, borax, etc.). D.4 Apparatus D.4.1 Melting electric furnace. D.4.2 Crucible; preferably a graphite crucible. D.4.3 Mold. D.4.4 Electronic scale. Accuracy is 0.01 kg. D.5 Test procedure D.5.1 Sampling In each inspection lot, take representative samples. The mass is not less than 10 kg. D.5.2 Weighing ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
