YS/T 955.1-2014Methods for chemical analysis of silver. Part 1: Determination of silver content. Fire assay method (English PDF)

Foreword

YS/T 955-2014 "crude chemical analysis of silver" is divided into two parts.

--- Part 1. Determination of the amount of silver fire assay;

--- Part 2. Flame atomic absorption spectrometry palladium content.

This section YS/T Part 1 955.

This section drafted in accordance with GB/T 1.1-2009 given rules.

The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.

This section is responsible for drafting unit. Zijin Mining Group Co., Ltd.

This section participated in the drafting unit. China Nonferrous Guilin Research Institute of Geology and Minerals Co. Ltd., Guangzhou Nonferrous Metal Research Institute, Hangzhou Fuchunjiang Smelting Co., Ltd., Henan Yuguang Gold & Lead Co., Ltd., Tongling Nonferrous rare metals subsidiary, Zijin Copper Co., Ltd., Jiangxi Copper shares Limited copies.

1 Scope

This method is applicable to the determination of crude silver content. Measurement range (mass fraction) of 40.00% to 99.90%.

When the sample contains platinum, palladium, ruthenium, rhodium, iridium and osmium and other platinum group elements, the method will not apply.

2 Principle of the method

The crude sample was wrapped in silver foil lead, at a high temperature molten state cupellation, lead and other metals are oxidized with gold and silver and other precious metals separation, Get together gold and silver tablets, weighing, gold after nitric acid points, minus the amount of gold and silver as measured by post along with the standard correction in a sample calculation of the mass fraction of silver.

3 Reagents and materials

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.

3.1 lead foil. pure lead (mass fraction >=99.99%) processed into a length of about 51mm, a thickness of about 0.1mm square sheet.

3.2 Silver. mass fraction >=99.99%.

3.3 gold. the mass fraction >=99.99%.

3.4 nitric acid (rho = 1.42g/mL).

3.5 nitric acid (17).

3.6 nitric acid (11).

3.7 Glacial acetic acid (rho = 1.05g/mL).

3.8 acetic acid (13).

3.9 porcelain crucible. 30mL.

3.10 MgO ash pan. with calcined magnesia powder (particle size 0.147mm) and No. 525 by 85.15 portland cement mix, adding a small amount of water, pressed Molding, dry naturally after use. Magnesium oxide ash pan size. diameter 30mm, height 26mm, inner diameter of 30mm, the concave depth 10mm.

4 Instruments and equipment

4.1 box-type high-temperature furnace.

4.2 Balance. a sense of the amount of 0.01mg.

4.3 mill machine. small, rolled up to a thickness of 0.1mm.

5 Step, Analysis