GB/T 20899.7-2022Methods for chemical analysis of gold ores—Part 7: Determination of iron content (English PDF)

Foreword

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 7 of GB/T 20899 "Methods for Chemical Analysis of Gold Ore". GB/T 20899 has issued the following 13 part.

--- Part 1: Determination of the amount of gold;

--- Part 2: Determination of silver content by flame atomic absorption spectrometry;

--- Part 3: Determination of the amount of arsenic;

--- 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 the amount of arsenic, mercury, cadmium, lead and bismuth atomic fluorescence spectrometry;

--- Part 13: Determination of the amount of lead, zinc, bismuth, cadmium, chromium, arsenic and mercury by inductively coupled plasma atomic emission spectrometry;

--- Part 14: Determination of the amount of thallium Inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry.

This document replaces GB/T 20899.7-2007 "Methods for Chemical Analysis of Gold Ore Part 7: Determination of Iron Content", and Compared with GB/T 20899.7-2007, except for structural adjustment and editorial changes, the main technical changes are as follows.

a) The determination method was changed, mercury dichloride was deleted, and it was changed to stannous chloride-titanium trichloride reduction (see 8.3.8, 5.3.3 of the 2007 edition);

b) Increased interference elimination methods (see 8.3.6, 8.3.7);

c) The calculation formula has been changed [see formula (1), formula (2) of the 2007 edition];

d) Delete the requirement of "allowable difference" (see Chapter 7 of the 2007 edition);

e) Increased "repeatability" and "reproducibility" requirements (see Chapter 10).

Introduction

After the raw ore has been sorted and processed, its main components have been enriched in the ore, and at the same time, the secondary components of the ore or other associated metals have also been obtained.

From recycling to recycling, GB/T 20899 "Chemical Analysis Methods of Gold Ore" aims to help gold industrial and mining enterprises to accurately understand the main components and impurities of gold ore It is beneficial to optimize the control parameters of the dressing and smelting process, precisely control the consumption of reagents, reduce the interference of impurity elements on the smelting and purification process, and improve the The comprehensive recovery rate of valuable elements can contribute to the efficient recycling of resources in the entire gold industry, sustainable green and healthy development, and the development of smart mines. Construction provides technical support. GB/T 20899 is proposed to consist of 14 parts.

--- Part 1: Determination of the amount of gold. The purpose is to specify the fire test gold gravimetric method and fire test gold enrichment-flame method for the determination of gold in gold ore. Atomic absorption spectrometry, activated carbon enrichment-flame atomic absorption spectrometry, activated carbon enrichment-iodometric method and applicable determination of each method scope.

--- Part 2: Determination of the amount of silver flame atomic absorption spectrometry. The purpose is to specify the flame atom for the determination of the amount of silver in gold ore Absorption Spectrometry and Applicable Measurement Range.

--- Part 3: Determination of the amount of arsenic. The purpose is to specify the silver diethyldithiocarbamate spectrophotometer for the determination of arsenic in gold ore Degree method and potassium dichromate titration method and applicable measurement range of each method.

--- Part 4: Determination of the amount of copper. The purpose is to specify the method of flame atomic absorption spectrometry and thiosulfuric acid for the determination of the amount of copper in gold ore Sodium titration method and applicable measurement range of each method.

--- Part 5: Determination of the amount of lead. The purpose is to specify the method of flame atomic absorption spectrometry and ethylenediamine tetramine for the determination of lead in gold ore Disodium acetate titration method and applicable determination range of each method.

--- Part 6: Determination of the amount of zinc. The purpose is to specify the flame atomic absorption spectrometry method and the applicable method for the determination of zinc in gold ore set range.

--- Part 7: Determination of iron content. The purpose is to specify the potassium dichromate titration method for the determination of iron in gold ore and its applicable determination scope.

--- Part 8: Determination of sulfur content. The purpose is to specify the barium sulfate gravimetric method and the combustion-acid-base titration method for the determination of sulfur in gold ore And the applicable measurement range of each method.

--- Part 9: Determination of carbon content. The purpose is to specify the ethanol-ethanolamine-potassium hydroxide titration method and method for the determination of carbon content in gold ores. Applicable measurement range.

--- Part 10: Determination of the amount of antimony. The purpose is to specify the cerium sulfate titration method and the hydride generation-principle method for the determination of antimony in gold ores. Sub-fluorescence spectroscopy and the applicable measurement range of each method.

--- Part 12: Determination of the amount of arsenic, mercury, cadmium, lead and bismuth atomic fluorescence spectrometry. The purpose is to regulate arsenic, mercury, cadmium, Hydride generation-atomic fluorescence spectrometry for the determination of lead and bismuth and its applicable measurement range.

--- Part 13: Determination of the amount of lead, zinc, bismuth, cadmium, chromium, arsenic and mercury Inductively coupled plasma atomic emission spectrometry. The purpose is 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 range of measurement.

--- Part 14: Determination of the amount of thallium Inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry. head Inductively Coupled Plasma Atomic Emission Spectrometry and Inductively Coupled Plasma Mass Spectrometry for the Determination of Thallium in Gold Ore method and the applicable measurement range of each method.

--- Part 15: Determination of copper, lead, zinc, silver, iron, manganese, nickel, cobalt, aluminum, chromium, cadmium, antimony, bismuth, arsenic, mercury, selenium, barium and beryllium Combined plasma mass spectrometry. The purpose is to specify copper, lead, zinc, silver, iron, manganese, nickel, cobalt, aluminum, chromium, cadmium, antimony, bismuth, arsenic, Inductively coupled plasma mass spectrometry and applicable measurement ranges for the determination of mercury, selenium, barium and beryllium.

1 Scope

This document specifies a method for the determination of the amount of iron in gold ores.

This document applies to the determination of the amount of iron in gold ore. Measuring range: the mass fraction is 1.00%~10.00%.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 17433 Basic Terms for Chemical Analysis of Metallurgical Products

3 Terms and Definitions

The terms and definitions defined in GB/T 17433 apply to this document.

4 Principles

Dissolve the sample with hydrochloric acid, nitric acid, and sulfuric acid. When the copper content is greater than 1 mg, use ammonia water-ammonium chloride to precipitate iron and separate copper from the matrix.

In the medium, stannous chloride reduced most of the iron, and the remaining small amount of iron was reduced by titanium trichloride with sodium tungstate as indicator. Add sulfur-phosphorus mixed acid to di Sodium aniline sulfonate was used as indicator, and it was titrated with potassium dichromate standard titration solution.

5 Reagents or Materials

Unless otherwise stated, only reagents and distilled or deionized water or water of equivalent purity were used in the test confirmed to be of analytical grade.

5.1 Ammonium chloride.

5.2 Hydrochloric acid, rho=1.19g/mL.

5.3 Nitric acid, rho=1.42g/mL.

5.4 Sulfuric acid, rho=1.84g/mL.

5.5 Perchloric acid, rho=1.76g/mL.

5.6 Hydrobromic acid, rho=1.50g/mL.

5.7 Ammonia water, rho=0.88g/mL.

5.8 Hydrochloric acid, (1 1).

5.9 Hydrochloric acid, (5 95).

5.10 Sulfuric acid, (1 1).

5.11 Sodium fluoride solution, rho=50g/L.