YS/T 1050.4-2015Methods for chemical analysis of lead antimony concentrates - Part 4: Determination of zinc content - Na2EDTA titration method (English PDF)

Foreword

YS/T 1050-2015 "Methods for chemical analysis of lead-antimony concentrate" is divided into the following nine sections.

--- Part 1. Determination of lead content Na2EDTA titration;

--- Part 2. Determination of antimony content cerium sulfate titration;

--- Part 3. Determination of arsenic content potassium bromate titration;

--- Part 4. Determination of zinc contents Na2EDTA titration;

--- Part 5. Determination of sulfur content - Gravimetric method;

--- Part 6. Determination of iron content cerium sulfate titration;

--- Part 7. Determination of the amount of bismuth and copper - Flame atomic absorption spectrometry amount;

--- Part 8. gold and silver content determination fire assay;

--- Part 9. Determination of the amount of silver by flame atomic absorption spectrometry.

This is Part 4.

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. Guangxi Metallurgical Product Quality Supervision and Inspection Station.

Drafting this Part. Analysis and Testing Research Center of Guangxi Zhuang Autonomous Region.

Participated in the drafting of this section. Beijing Nonferrous Metal Research Institute, Nanning Abacus Detection Technology Co., Ltd., China Guangxi Nonferrous Forest Research Institute of Geology for Mineral Resources Limited.

1 Scope

YS/T 1050 provisions of this part of the determination of lead, antimony concentrate zinc content.

This section applies to the determination of lead-antimony concentrate zinc content measurement range (mass fraction) of 1.00% to 10.00%.

2 Method summary

Sample with nitric acid, potassium chlorate and sulfuric acid dissolved, hydrobromide except antimony, precipitation of lead in the presence of an oxidant in the ammonia medium precipitation stars from iron, manganese, bismuth and other interfering elements, the filtrate was added masking agent to eliminate the interference of copper, aluminum and the like, with xylenol orange as indicator, the pH value 5.0 to 6.0 in acetic acid - sodium acetate buffer solution, titrated to a solution from the standard solution with Na2EDTA purple to bright yellow as the end point.

3 Reagents

Unless otherwise indicated, this part of the reagents were analytical reagent, the water for the two water.

3.1 zinc (Zn mass fraction >=99.99%).

3.2 ascorbic acid.

3.3 anhydrous sodium acetate.

3.4 ammonium chloride.

3.5 potassium chlorate.

3.6 hydrochloric acid (rho = 1.19g/mL).

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

3.8 sulfate (rho = 1.84g/mL).

3.9 hydrobromide (rho = 1.49g/mL).

3.10 aqueous ammonia (rho = 0.90g/mL).

3.11 acetic acid (rho = 1.049g/mL).

3.12 hydrochloric acid (11).

Sulfuric acid 3.13 (11).

Sulfuric acid 3.14 (19).

Sulfuric acid 3.15 (298).

3.16 nitric acid (11).

3.17 ammonia (11).

3.18 washing solution. Weigh 2g of ammonium chloride (3.4) dissolved in 100mL of water, ammonia added 0.5mL (3.17) and mix.

3.19 ammonium persulfate solution (200g/L), with the preparation.

3.20 potassium fluoride solution (200g/L), stored in a plastic bottle.

3.21 sodium thiosulfate solution (100g/L).