GB/T 3884.2-2025 (GB/T 3884.2-2012) English PDF
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GB/T 3884.2: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 3884.2-2025 | 919 | Add to Cart | 7 days | Methods for chemical analysis of copper concentrates - Part 2: Determination of gold and silver contents - Flame atomic absorption spectrmetric method and fire assay method | Valid |
| GB/T 3884.2-2012 | 85 | Add to Cart | Auto, 9 seconds. | Methods for chemical analysis of copper concentrates - Part 2: Determination of gold and silver contents - Flame atomic absorption spectrometric method and fire assay method | Valid |
| GB/T 3884.2-2000 | 319 | Add to Cart | 3 days | Methods for chemical analysis of copper concentrates. Determination of gold and silver content | Obsolete |
| GB/T 3884.2-1983 | RFQ | ASK | 3 days | Methods for chemical analysis of copper concentrates--The wet chemical and fire-assaying methods for the determination of gold and silver content | Obsolete |
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GB/T 3884.2-2012: Methods for chemical analysis of copper concentrates - Part 2: Determination of gold and silver contents - Flame atomic absorption spectrometric method and fire assay method
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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.120.60 H 13 Replacing GB/T 3884.2-2000 Methods for chemical analysis of copper concentrates - Part 2.Determination of gold and silver contents - Flame atomic absorption spectrometric method and fire assay method Issued on. DECEMBER 31, 2012 Implemented on. OCTOBER 1, 2013 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3 1 Scope... 5 2 Method 1 - Flame atomic absorption spectrometric method... 5 3 Method 2 - Fire assay method... 9Foreword
GB/T 3884 Methods for chemical analysis of copper concentrates is divided into 14 parts. — Part 1.Determination of copper content - Iodine titration method — Part 2.Determination of gold and silver contents - Flame atomic absorption spectrometric method and fire assay method — Part 3.Determination of sulfur content - Gravimetric method and combustion-titration method — Part 4.Determination of magnesium oxide content - Flame atomic absorption spectrophotometry method — Part 5.Determination of fluoride content - Ion selective electrode method — Part 6.Determination of lead, zinc, cadmium and nickel content - Flame atomic absorption spectrometry method — Part 7.Determination of lead content - Na2EDTA titration method — Part 8.Determination of zinc content - Na2EDTA titration method — Part 9.Determination of arsenic and bismuth contents - Hydride generation-atomic fluorescence spectrometry method - The potassium bromate titration method and the silver diethyldithiocarbamate photometric method — Part 10.Determination of antimony content - Hydride generation atomic fluorescence spectrometry method — Part 11.Determination of mercury content - Cold atomic absorption spectrometric method — Part 12.Determination of fluoride content and chloride content - Ion chromatography — Part 13.Determination of copper - Electrogravimetric method — Part 14.Determination of gold and silver - Fire assay gravimetric and flame atomic absorption spectrometric method This Part is Part 2. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 3884.2-2000 Methods for chemical analysis of copper concentrates - Determination of gold and silver contents. Compared with GB/T 3884.2-2000, the following changes have occurred. — The text format was modified; — Precision and test report terms were supplemented. This Part shall be under the jurisdiction of the National Technical Committee for Standardization of Nonferrous Metals (SAC/TC 243). Responsible drafting organization of this Part. Daye Nonferrous Metals Group Holdings Co., Ltd. Drafting organization of this Part. Daye Nonferrous Metals Group Holdings Co., Ltd. Participating drafting organizations of this Part. Beijing General Research Institute of Mining & Metallurgy, Tongling Nonferrous Metals Group Holding Co., Ltd., Jiangxi Copper Industry Co., Ltd., Zhongtiaoshan Non-ferrous Metals Group Co., Ltd., Yunnan Copper Industry Co., Ltd., Zhuzhou Smelter Group Co., Ltd., Zijin Mining Group Co., Ltd., MCC Huludao Nonferrous Metals Group Co., Ltd., Hunan Shuikoushan Nonferrous Metals Group Co., Ltd., Yanggu Xiangguang Copper Industry Co., Ltd., and Hunan Research Institute for Nonferrous Metals. Main drafters of method 1 in this Part. Yuan Gongqi, Xiao Zehong, Li Xiaoyu, Feng Yuan, Wang Haoying, Zhou Xiaokai, Wang Junyi, Chen Yao, Ma Lijun, Zhang Yu, Mu Xiumei, Zheng Wenying, Zhang Yanyun, Peng Jian, Zhang Hongxian, Chi Fenghua, Cao Yan, Luo Yongfeng, Zhang Yongzhong, and Li Bing. Main drafters of method 2 in this Part. Wang Yongbin, Yuan Gongqi, Feng Congxin, Huang Shangyuan, Xiong Meiyu, Yuan Yuxia, Liu Chenghua, Li Qinmei, Wang Datong, Chang Jixiang, Zhang Zhongxiang, Han Yunshan, Zhang Ming, Chen Liqing, Liu Zhiqiang, Ma Ning, Wang Yue, Zeng Guangming, Zhou Hongding, and Zhang Qiaoyan. The release of previous editions of the standards replaced by this Part is. — GB/T 3884.2-1983, GB/T 3884.14-1986, GB/T 3884.15-1986, and GB/T 3884.2-2000. Methods for chemical analysis of copper concentrates - Part 2.Determination of gold and silver contents - Flame atomic absorption spectrometric method and fire assay method1 Scope
This method specifies the method for determining gold and silver contents in copper concentrates. This method applies to the determination of gold and silver contents in copper concentrates. Determination range of method 1.silver. 10.0g/t to 300.0g/t; determination range of method 2.gold. 0.50g/t to 40.00g/t; silver. 50.0g/t to 2,500.0g/t.2 Method 1 - Flame atomic absorption spectrometric
method 2.1 Method summary DISSOLVE the specimen by nitric acid and perchloric acid. In a dilute hydrochloric acid medium, MEASURE the absorbance of silver by an air-acetylene flame at an atomic absorption spectrometer at a wavelength of 328.1nm. DEDUCT the background absorption. CALCULATE the silver content according to the standard curve. 2.2 Reagents Unless otherwise stated, only analytically pure reagents and distilled or deionized water or water of comparable purity are used in the analysis. 2.3 Instruments Atomic absorption spectrometer, with silver hollow cathode lamp. Under the best operating conditions of the instrument, those that can reach the following indexes may be used. 2.4 Specimen 2.4.1 The sample size shall be no more than 100μm. 2.4.2 The sample shall be dried at 100°C to 105°C for 1h and then placed in a desiccator to cool to room temperature. 2.5 Analytical procedure 2.7 Precision 2.7.1 Repeatability The measured values of the two independent test results obtained under the repeatability conditions are within the range of average values given below. The absolute difference between the two test results does not exceed the repeatability limit (r).3 Method 2 - Fire assay method
3.1 Method summary The specimen is compounded and melted at a high temperature. The precious metal in the molten metal lead capture specimen forms a lead buckle. 3.2 Reagents Unless otherwise stated, only analytically pure reagents and distilled or deionized water or water of comparable purity are used in the analysis. 3.2.5 Starch. powdery. 3.2.6 Potassium nitrate. powdery. 3.2.7 Sodium chloride. industrial pure, powdery. 3.2.8 Pure silver. 99.99%. 3.2.9 Lead foil. 0.1mm to 0.15mm thick, 3g to 5g in mass, square, with a gold content of less than 0.1g/t. 3.2.10 Nitric acid (ρ=1.42g/mL), guaranteed reagent. 3.2.11 Nitric acid (1+7), free of chloride. 3.3.3 Clay crucible. Made of refractory clay with a volume of about 300mL. 3.3.4 Electric blast oven. 3.3.5 Cupel machine. 3.3.6 Specimen pulverizer. 3.3.7 Cupel. The top inner diameter is 35mm, the bottom outer diameter is 40mm, the height is 30mm, and the depth is about 17mm. Preparation method. One portion by weight of ash is mixed well with three portions by weight of cement (#425). ADD appropriate amount of water, and STIR well. PRESS and FORM on a cupel machine. DRY for three months for later use. 3.3.8 Porcelain crucible (low profile). The volume is 30mL. 3.3.9 Porcelain crucible. The volume is 50mL. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
