GB/T 6150.2-2022Methods for chemical analysis of tungsten concentrates—Part 2: Determination of tin content—Potassium iodate titrimetry and inductively coupled plasma atomic emission spectrometry (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 of Standardization Documents" drafted.

This document is part 2 of GB/T 6150 "Methods for Chemical Analysis of Tungsten Concentrates". GB/T 6150 has released the following parts.

--- Determination of the amount of tungsten trioxide ammonium tungstate burning gravimetric method;

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

--- Determination of phosphorus content by phosphorous molybdenum yellow spectrophotometry;

--- Determination of sulfur content by high-frequency infrared absorption method;

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

--- Determination of wet water storage gravimetric method;

--- Determination of the amount of tantalum and niobium plasma emission spectrometry and spectrophotometry;

--- Determination of molybdenum content by thiocyanate spectrophotometry;

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

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

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

--- 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;

--- Determination of the amount of bismuth by flame atomic absorption spectrometry;

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

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

This document replaces GB/T 6150.2-2008 "Chemical Analysis of Tungsten Concentrates - Determination of Tin Amount by Potassium Iodate Volumetric Method and Hydride Compared with GB/T 6150.2-2008, except for structural adjustment and editorial changes, the main technical changes are as follows.

a) The measurement range of Method 1 is changed from 0.20%~2.0% to 1.00%~20.00% (see Chapter 1, Chapter 1 of the 2008 edition), more Method 2 was changed from hydride atomic absorption spectrometry to inductively coupled plasma atomic emission spectrometry, and the measurement range was 0.010%~2.00% (see Chapter 1, Chapter 1 and Chapter 9 of the 2008 edition);

b) Changed the reducing agent in the principle (see Chapter 2 of 4.1, 2008 edition);

c) Changed the weighing of the sample (see 4.5.1, 5.1 of the 2008 edition);

d) Change the tolerance to reproducibility (see 4.7.2, 5.7.2, 7.2, 16.2 of the 2008 edition);

e) quality assurance and control are deleted (see Chapter 8 of the 2008 edition);

f) Added the chapter "Test Report" (see Chapter 6).

Introduction

Tungsten concentrate is an important strategic resource, and tungsten and tungsten alloys are produced as important industrial raw materials.

It has the characteristics of heavy and high hardness, and is widely used in machining, metallurgy, mining, electronic communication, construction industry, weapon industry, aerospace and other fields.

GB/T 6150 aims to establish a set of complete, practical and suitable chemical production and trade requirements for tungsten concentrate products through experimental research.

Methodological standards for compositional analysis. Due to the limitations of document length, usage requirements, scope of application, and technical independence between analytical methods, etc. Therefore, GB/T 6150 is intended to consist of 20 parts.

--- Part 1: Determination of tungsten trioxide content by ammonium tungstate burning 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 phosphoro-molybdenum yellow spectrophotometry and inductively coupled plasma atomic emission spectrometry;

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

--- Part 5: Determination of calcium content by EDTA volumetric method and flame atomic absorption spectrometry;

--- Part 6: Determination of wet moisture content gravimetric method;

--- Part 7: Determination of tantalum and niobium content by plasma emission spectrometry and spectrophotometry;

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

--- Part 9: 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;

--- Part 11: Determination of zinc content by flame atomic absorption spectrometry;

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

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

--- Part 14: Determination of manganese content by volumetric ammonium ferrous sulfate and flame atomic absorption spectrometry;

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

--- Part 16: 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;

--- Part 19: Determination of fluorine content by ion-selective electrode method;

--- Part 20: Determination of mercury content by spectrophotometry.

The series of standardization documents for chemical analysis methods of tungsten concentrates are mainly drafted according to the technical indicators in the product standards of tungsten concentrates. Since 1985 Come, has released two versions of GB/T 6150.GB/T 6150.2-2008 has been released and implemented for more than ten years. During this period, the applicable YS/T 231 The product standards have been revised in 2015, and various technical indicators have undergone new changes, and upstream and downstream customers in the tungsten industry have also experienced product testing.

At the same time, the analysis and detection technology has also developed and improved. In view of this, it is indeed necessary to revise GB/T 6150.2-2008, Ensure that standards adapt to industry changes and market needs.

This document further enhances the applicability of the standard, in improving the quality of tungsten concentrate products, promoting their production, trade and expanding application demand. The face is important.

1 Scope

This document specifies methods for the determination of tin content in tungsten concentrates, including potassium iodate titration (method 1) and inductively coupled plasma atomic Emission Spectroscopy (Method Two).

This document is applicable to the determination of tin content in tungsten concentrates, the determination range (mass fraction) of method 1.1.00%~20.00%. Method Two Determination range (mass fraction). 0.010%~2.00%. For the overlapping part of the measurement range, method 2 is used as the arbitration method.

2 Normative references

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

GB/T 6682 Analysis Laboratory Water Specifications and Test Methods

GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values

3 Terms and Definitions

There are no terms and definitions that need to be defined in this document.

4 Method 1.Potassium iodate titration