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GB/T 20899.9-2025: Methods for chemical analysis of gold ores - Part 9: Determination of carbon content
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Methods for chemical analysis of gold ores - Part 9: Determination of carbon content
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GB/T 20899.9-2025
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| GB/T 20899.9-2007 | English | 159 |
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Methods for chemical analysis of gold ores -- Part 9: Determination of carbon contents
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GB/T 20899.9-2007
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Basic data | Standard ID | GB/T 20899.9-2025 (GB/T20899.9-2025) | | Description (Translated English) | Methods for chemical analysis of gold ores - Part 9: Determination of carbon content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D46 | | Classification of International Standard | 73.060.99 | | Word Count Estimation | 13,124 | | Date of Issue | 2025-06-30 | | Date of Implementation | 2026-01-01 | | Older Standard (superseded by this standard) | GB/T 20899.9-2007 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20899.9-2025: Methods for chemical analysis of gold ores - Part 9: Determination of carbon content
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ICS 73.060.99
CCSD46
National Standard of the People's Republic of China
Replaces GB/T 20899.9-2007
Chemical analysis methods for gold ores
Part 9.Determination of carbon content
Released on June 30, 2025
Implementation on January 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Method 1.Non-aqueous titration 1
4.1 Principle 1
4.2 Reagents or Materials 1
4.3 Instruments and Equipment 2
4.4 Sample 3
4.5 Test Step 4
4.6 Experimental data processing 4
4.7 Precision 5
4.8 Test report 5
5 Method 2.High frequency combustion infrared absorption method 5
5.1 Principle 5
5.2 Reagents or materials 6
5.3 Instruments and Equipment 6
5.4 Sample 6
5.5 Test Step 6
5.6 Experimental data processing 7
5.7 Precision 7
5.8 Test report 8
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is Part 9 of GB/T 20899 “Methods for chemical analysis of gold ores”. GB/T 20899 has published the following 14 parts.
part.
--- Part 1.Determination of gold content;
--- Part 2.Determination of silver content - Flame atomic absorption spectrometry;
--- Part 3.Determination of arsenic content;
--- Part 4.Determination of copper content;
--- Part 5.Determination of lead content;
--- Part 6.Determination of zinc content;
--- Part 7.Determination of iron content;
--- Part 8.Determination of sulfur content;
--- Part 9.Determination of carbon content;
--- Part 10.Determination of antimony content;
--- Part 12.Determination of arsenic, mercury, cadmium, lead and bismuth content - Atomic fluorescence spectrometry;
--- Part 13.Determination of lead, zinc, bismuth, cadmium, chromium, arsenic and mercury content - Inductively coupled plasma atomic emission spectrometry;
--- Part 14.Determination of thallium content - Inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry.
--- Part 15.Determination of the content of copper, lead, zinc, silver, iron, manganese, nickel, cobalt, aluminium, chromium, cadmium, antimony, bismuth, arsenic, mercury, selenium, barium and beryllium
Combined plasma mass spectrometry.
This document replaces GB/T 20899.9-2007 "Chemical analysis methods of gold ores Part 9.Determination of carbon content" and GB/T 20899.9-
Compared with.2007, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Added the introduction and elimination methods of interference in non-aqueous titration method (see 4.5.3.1);
b) Added high-frequency combustion infrared absorption method (see Chapter 5).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed and coordinated by the National Gold Standardization Technical Committee (SAC/TC379).
This document was drafted by. Changchun Gold Research Institute Co., Ltd., Henan Zhongyuan Gold Smelter Co., Ltd., Inner Mongolia Taiping Mining
Co., Ltd., Changchun National Inspection (Jiyuan) Testing Technology Co., Ltd., Zijin Mining Group Co., Ltd., Shandong Gold Geology and Mineral Exploration Co., Ltd.
Co., Ltd., Shenzhen Gold and Silver Jewelry Testing and Research Center Co., Ltd., SDIC Jincheng Metallurgical Co., Ltd., Shandong Gold Mining Technology
Co., Ltd. Metallurgical Laboratory Branch, Henan Gold Industry Technology Research Institute Co., Ltd., Jiangxi Sanhe Gold Industry Co., Ltd., Changchun Gold Research Institute
Yantai Precious Metals Materials Research Institute Co., Ltd. and Yunnan Gold Mining Group Precious Metals Testing Co., Ltd.
The main drafters of this document are. Lu Xingen, Yang Xing, Guan Guojun, Zhang Yue, Wang Xia, Sun Ke, Zhang Weibin, Zhao Kedi, Li Yanhong, Pang Wenhao, Ren Lifang,
Mu Yan, Lin Cuifang, Du Yuanyuan, Li Qianqian, Qin Guanglin, Li Jianzheng, Chen Yu, Wu Shuai, Zhou Xuliang, Liu Peng, Wang Shaoxi, Yang Ling, Li Yanji, and Chen Xiaoke.
The previous versions of this document and the documents it replaces are as follows.
---GB/T 20899.9-2007;
---This is the first revision.
introduction
GB/T 20899 "Methods for Chemical Analysis of Gold Ores" aims to help gold mining companies accurately understand the valuable elements and impurity content of gold ores.
It is beneficial to optimize the control parameters of the smelting process, accurately control the consumption of reagents, reduce the interference of impurity elements on the smelting and purification process, and improve the efficiency of various
The comprehensive recovery rate of valence elements can contribute to the efficient recycling of resources, sustainable green and healthy development, and the construction of smart mines in the entire gold industry.
GB/T 20899 is planned to consist of 14 parts.
--- Part 1.Determination of gold content. The purpose is to specify the fire assay gravimetric method, fire assay enrichment-flame
Atomic absorption spectrometry, activated carbon enrichment-flame atomic absorption spectrometry, activated carbon enrichment-iodine titration and the determination of the applicable methods
scope.
--- Part 2.Determination of silver content flame atomic absorption spectrometry. The purpose is to specify the flame atomic absorption spectrometry method for the determination of silver content in gold ores
Absorption spectroscopy and applicable measurement range.
--- Part 3.Determination of arsenic content. The purpose is to specify the diethyldithiocarbamate silver spectrophotometric method for the determination of arsenic content in gold ores.
The titration method and potassium dichromate titration method and the applicable determination range of each method.
--- Part 4.Determination of copper content. The purpose is to specify the flame atomic absorption spectrometry and thiosulfate method for the determination of copper content in gold ores
Sodium titration method and the applicable measurement range of each method.
--- Part 5.Determination of lead content. The purpose is to specify the flame atomic absorption spectrometry and ethylenediaminetetramine method for the determination of lead content in gold ores.
Disodium acetate titration method and the applicable determination range of each method.
--- Part 6.Determination of zinc content. The purpose is to specify the flame atomic absorption spectrometric method for the determination of zinc content in gold ores and the applicable measurement methods.
Set a range.
--- Part 7.Determination of iron content. The purpose is to specify the potassium dichromate titration method for the determination of iron content in gold ore and the applicable determination method.
scope.
--- Part 8.Determination of sulfur content. The purpose is to specify the barium sulfate gravimetric method and combustion-acid-base titration method for the determination of sulfur content in gold ores
and the applicable measurement range of each method.
--- Part 9.Determination of carbon content. The purpose is to specify the non-aqueous titration method and high-frequency combustion infrared absorption method for the determination of carbon content in gold ores
Method and applicable measurement range.
--- Part 10.Determination of antimony content. The purpose is to specify the flame atomic absorption spectrometry and cerium sulfate drop method for the determination of antimony content in gold ores
The determination method and the applicable measurement range of each method.
--- Part 12.Determination of arsenic, mercury, cadmium, lead and bismuth content by atomic fluorescence spectrometry.
Determination of lead and bismuth by hydride generation-atomic fluorescence spectrometry and its applicable determination range.
--- Part 13.Determination of lead, zinc, bismuth, cadmium, chromium, arsenic and mercury content - Inductively coupled plasma atomic emission spectrometry.
Inductively coupled plasma atomic emission spectrometry for the determination of lead, zinc, bismuth, cadmium, chromium, arsenic and mercury in specified gold ores and its application
measurement range.
--- Part 14.Determination of thallium content - Inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry.
The purpose is to determine the amount of thallium in gold ores by inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry
Methods and the applicable measurement range of each method.
--- Part 15.Determination of the content of copper, lead, zinc, silver, iron, manganese, nickel, cobalt, aluminium, chromium, cadmium, antimony, bismuth, arsenic, mercury, selenium, barium and beryllium
The purpose is to determine the content of copper, lead, zinc, silver, iron, manganese, nickel, cobalt, aluminum, chromium, cadmium, antimony, bismuth, arsenic,
Determination of mercury, selenium, barium and beryllium by inductively coupled plasma mass spectrometry and applicable determination range.
Chemical analysis methods for gold ores
Part 9.Determination of carbon content
1 Scope
This document specifies the method for the determination of carbon content in gold ores.
This document is applicable to the determination of carbon content in gold ore. Method 1 Non-aqueous titration method Determination range. 0.10%~5.00%; Method 2 High-frequency combustion
Determination range of infrared absorption method. 0.02%~5.00%.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 17433 Basic terminology for chemical analysis of metallurgical products
3 Terms and Definitions
The terms and definitions defined in GB/T 17433 apply to this document.
4 Method 1.Non-aqueous titration
4.1 Principle
The sample is burned in an oxygen flow at 1200℃~1250℃, using copper oxide as a co-solvent to convert carbon into carbon dioxide, and hydrogen peroxide and
Active manganese dioxide is used as a desulfurizer, thymolphthalein is used as an indicator, and ethanol-ethanolamine-potassium hydroxide solution is used to absorb and titrate carbon dioxide.
4.2 Reagents or materials
Unless otherwise stated, only reagents of confirmed analytical grade and distilled or deionized water or water of equivalent purity were used in the tests.
4.2.1 Calcium carbonate. w ≥ 99.99%.
4.2.2 Copper oxide. powder.
4.2.3 Anhydrous ethanol.
4.2.4 Sulfuric acid. ρ = 1.84 g/mL.
4.2.5 Hydrogen peroxide. φ=30%.
4.2.6 Potassium permanganate-sodium hydroxide solution. Weigh 3.0 g of potassium permanganate and dissolve it in 100 mL of water. Add 10 g of sodium hydroxide and dissolve.
Into the gas washing bottle.
4.2.7 Activated manganese dioxide slurry (1000 g/L). Weigh 50 g of activated manganese dioxide powder into a gas washing bottle and add 50 mL of distilled water.
4.2.8 Absorption solution. Potassium hydroxide standard solution [c(KOH)≈0.03mol/L]. Dissolve 30mL of ethanolamine in 970mL of anhydrous ethanol.
Add 1.5g potassium hydroxide to the alcohol (4.2.3), and after the potassium hydroxide is completely dissolved, add 150mg thymolphthalein indicator, mix well, filter, and keep
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