GB/T 6150.12-2023Methods for chemical analysis of tungsten concentrates—Part 12: Determination of silicon dioxide content—Silicomolybdenum blue spectrophotometry and gravimetry (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document is Part 12 of GB/T 6150 "Chemical Analysis Methods for Tungsten Concentrates". GB/T 6150 has released the following parts.

---Part 1: Determination of tungsten trioxide content by ammonium tungstate ignition gravimetric method;

---Part 2: Determination of tin content by potassium iodate titration and inductively coupled plasma atomic emission spectrometry;

---Part 3: Determination of phosphorus content by phosphomolybdenum yellow spectrophotometry and inductively coupled plasma atomic emission spectrometry;

---Part 4: Determination of sulfur content by high-frequency induction infrared absorption method and combustion-iodometric method;

---Determination of calcium content by EDTA volumetric method and atomic absorption spectrometry;

---Part 6: Gravimetric method for determination of wet water content;

---Determination of tantalum and niobium content by plasma emission spectrometry and spectrophotometry;

---Part 8: Determination of molybdenum content by thiocyanate spectrophotometry;

---Determination of copper content by flame atomic absorption spectrometry;

---Part 10: Determination of lead content by hydride generation atomic fluorescence spectrometry and flame atomic absorption spectrometry;

---Determination of zinc content by flame atomic absorption spectrometry;

---Part 12: Determination of silica content by silicon-molybdenum blue spectrophotometry and gravimetric method;

---Part 13: Determination of arsenic content by atomic fluorescence spectrometry and DDTC-Ag spectrophotometry;

---Determination of manganese content by ferrous ammonium sulfate volumetric method and flame atomic absorption spectrometry;

---Part 15: Determination of bismuth content by hydride generation atomic fluorescence spectrometry and flame atomic absorption spectrometry;

---Determination of iron content by sulfosalicylic acid spectrophotometry;

---Part 17: Determination of antimony content by atomic fluorescence spectrometry;

---Part 18: Determination of barium content by inductively coupled plasma atomic emission spectrometry.

This document replaces GB/T 6150.12-2008 "Methods for chemical analysis of tungsten concentrate - Determination of silica content - Silicon Molybdenum Blue Spectrophotometry "Method and Weight Method", compared with GB/T 6150.12-2008, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) The measurement range of Method 1 has been changed from 0.50%~3.00% to 0.50%~10.00% (see Chapter 1, 2008 edition Chapter 1);

b) Added "Terms and Definitions" (see Chapter 3);

c) Changed the sample dissolution method and separation conditions of silica and tungsten in Method 1 (see 4.5.4.1, 6.4.1 and 6.4.4 of the 2008 edition);

d) The reduction and color development conditions of Method 1 have been changed (see 4.5.4.2, 6.4.6 of the 2008 edition);

e) "Precision" has been changed (see 4.8 and 5.6, Chapter 8 and Chapter 16 of the 2008 edition).

Introduction

Tungsten concentrate is an important strategic resource. As an important industrial raw material, tungsten and tungsten alloys are produced due to their high melting point and high specific ratio.

Due to its heavy weight and high hardness, it is widely used in mechanical processing, metallurgy, mining, electronic telecommunications, construction industry, weapons industry, aerospace and other fields.

GB/T 6150 aims to establish through experimental research a complete set of chemical compositions that are practical and adaptable to the production and trade needs of tungsten concentrate products.

Methodological standards for analysis. Limited by the length of the document, usage requirements, scope of application, and technical independence between each analysis method, etc. Therefore, GB/T 6150 is planned to consist of 20 parts.

---Part 1: Determination of tungsten trioxide content. Ammonium tungstate ignition gravimetric method. The purpose is to establish the determination of tungsten trioxide content method.

---Part 2: Determination of tin content by potassium iodate titration and inductively coupled plasma atomic emission spectrometry. The purpose is to ensure Determination method of tin content.

---Part 3: Determination of phosphorus content by phosphomolybdenum yellow spectrophotometry and inductively coupled plasma atomic emission spectrometry. The purpose is To establish a method for determining phosphorus content.

---Part 4: Determination of sulfur content by high-frequency induction infrared absorption method and combustion-iodometric method. The purpose is to establish the determination of sulfur content method.

---Part 5: Determination of calcium content by EDTA volumetric method and flame atomic absorption spectrometry. The purpose is to establish the measurement of calcium content Determine the method.

---Part 6: Gravimetric method for determination of wet water content. The purpose is to establish a method for determining wet water content.

---Part 7: Determination of tantalum and niobium content by plasma emission spectrometry and spectrophotometry. The purpose is to establish that tantalum and niobium contain Quantity measurement method.

---Part 8: Determination of molybdenum content by thiocyanate spectrophotometry. The purpose is to establish a method for determining molybdenum content.

---Part 9: Determination of copper content by flame atomic absorption spectrometry. The purpose is to establish a method for measuring copper content.

---Part 10: Determination of lead content by hydride generation atomic fluorescence spectrometry and flame atomic absorption spectrometry. The purpose is to ensure Method for determination of vertical lead content.

---Part 11: Determination of zinc content by flame atomic absorption spectrometry. The purpose is to establish a method for determining zinc content.

---Part 12: Determination of silica content by silicon molybdenum blue spectrophotometry and gravimetric method. The purpose is to establish the silica content method of determination.

---Part 13: Determination of arsenic content by atomic fluorescence spectrometry and DDTC-Ag spectrophotometry. The aim was to establish the arsenic content method of determination.

---Part 14: Determination of manganese content by ferrous ammonium sulfate volumetric method and flame atomic absorption spectrometry. The aim is to establish the manganese content method of determination.

---Part 15: Determination of bismuth content by hydride generation atomic fluorescence spectrometry and flame atomic absorption spectrometry. The purpose is to ensure Method for determination of bismuth content.

---Part 16: Determination of iron content by sulfosalicylic acid spectrophotometry. The purpose is to establish a method for determining iron content.

---Part 17: Determination of antimony content by atomic fluorescence spectrometry. The purpose is to establish a method for determining antimony content.

---Part 18: Determination of barium content by inductively coupled plasma atomic emission spectrometry. The purpose is to establish the determination of barium content method.

---Part 19: Determination of fluorine content by ion selective electrode method. The purpose is to establish a method for measuring fluorine content.

---Part 20: Determination of mercury content by spectrophotometry. The purpose is to establish a method for measuring mercury content.

The series of standardization documents for chemical analysis methods of tungsten concentrate are mainly drafted based on the technical indicators in the tungsten concentrate product standards. Since 1985 Since then, two versions of GB/T 6150 have been released. It has been more than ten years since GB/T 6150.12-2008 was released and implemented. During this period, its applicable products The standard has been revised in 2015 (YS/T 231-2015), and various technical indicators have undergone new changes. Upstream and downstream customers in the tungsten industry have Product testing also has new requirements, and analytical testing technology has also developed and progressed. In view of this, it is indeed necessary to revise GB/T 6150.12- It was revised in 2008 to ensure that the standard adapts to industry changes and market needs.

This document further improves the applicability of the standard and plays an important role in improving the quality of tungsten concentrate products, promoting its production, trade and expanding application demand. Masks are of great significance.

1 Scope

This document specifies a method for the determination of silica content in tungsten concentrates.

This document is applicable to the determination of silica content in tungsten concentrate and includes two methods (Method 1.Silicon Molybdenum Blue Spectrophotometry; Method 2. weight method). Method 1.Determination range (mass fraction). 0.50%~10.00%; Method 2.Determination range (mass fraction). 3.00%~ 10.00%. For overlapping measurement ranges, Method 1 will be used as the arbitration method.

2 Normative reference documents

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

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 8170 Numerical rounding rules and representation and determination of limit values

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.Silicon Molybdenum Blue Spectrophotometry