YS/T 820.5-2012Methods for chemical analysis of laterite nickel ores. Part 5: Determination of cobalt content. Flame atomic absorption spectrometry (English PDF)

Foreword

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

YS/T 820-2012 "Methods for chemical analysis of nickel laterite ore" is divided into 26 parts.

--- Part 1. Determination of nickel content by flame atomic absorption spectrometry;

--- Part 2. Determination of the amount of nickel dimethylglyoxime spectrophotometry;

--- Part 3. Determination of total iron content of dichromate method;

--- Part 4. Determination of phosphorus content - Molybdenum blue spectrophotometric method;

--- Part 5. Determination of cobalt content by flame atomic absorption spectrometry;

--- Part 6. Determination of copper content - Flame atomic absorption spectrometry;

--- Part 7. Determination of calcium and magnesium content by flame atomic absorption spectrometry;

--- Part 8. Determination of the amount of silica silicon potassium fluoride titration;

--- Part 9. scandium, cadmium content - Inductively Coupled Plasma - Mass Spectrometry;

--- Part 10. calcium, cobalt, copper, magnesium, manganese, nickel, zinc and phosphorus content - Inductively Coupled Plasma - Atomic Emission Spectrometry;

--- Part 11. Determination of the amount of fluorine and chlorine ion chromatography;

--- Part 12. Determination of manganese content by flame atomic absorption spectrometry;

--- Part 13. Determination of lead content by flame atomic absorption spectrometry;

--- Part 14. Determination of zinc content - Flame atomic absorption spectrometry;

--- Part 15. Determination of cadmium content by flame atomic absorption spectrometry;

--- Part 16. carbon, sulfur content was measured by high frequency combustion infrared absorption spectroscopy;

--- Part 17. arsenic, antimony, bismuth contents hydride generation - atomic fluorescence spectrometry;

--- Part 18. Determination of mercury content - Cold atomic absorption spectrometry;

--- Part 19. Determination of energy aluminum, chromium, iron, magnesium, manganese, nickel and silicon content dispersive X-ray fluorescence spectrometry;

--- Part 20. Determination of aluminum content EDTA titration;

--- Part 21. Determination of chromium content ammonium ferrous sulfate titration;

--- Part 22. Determination of magnesium content EDTA titration;

--- Part 23. cobalt, iron, nickel, phosphorus, aluminum oxide, calcium oxide, chromium oxide, magnesium oxide, manganese oxide, silicon dioxide and titanium dioxide volume Wavelength dispersive X-ray fluorescence spectrometry;

--- Part 24. Determination of hygroscopic water weight method;

--- Part 25. Determination of combined water content - Gravimetric method;

--- Part 26. Determination of loss on ignition - Gravimetric method.

This section YS/T 820-2012 Part 5.

This method is a method of arbitration.

This standard by the national non-ferrous metals Standardization Technical Committee (SAC/TC243) centralized.

This standard by the Beijing General Research Institute of Mining and Metallurgy, People's Republic of China Bayuquan Exit Inspection and Quarantine, Jinchuan Group Ltd, Drafted.

This section is drafted. Jinchuan Group Co., Ltd., Beijing General Research Institute of Mining and Metallurgy.

Participated in the drafting of this section. People's Republic of China, Nantong Exit Inspection and Quarantine, People's Republic of China Tianjin Entry-Exit Inspection and Quarantine Bureau, Northwest Nonferrous Metal Research Institute, Zhongbao Binhai Nickel Industry Co., Ltd. Guangxi Silver billion mining and metallurgy.

1 Scope

This section YS/T 820 specifies the method for the determination of cobalt content of the nickel laterite ore.

This section applies to the determination of the amount of cobalt laterite nickel ore. Measuring range. 0.01% to 0.20%.

2 Method summary

Samples with hydrochloric acid, nitric acid, hydrofluoric acid and perchloric acid decomposition. Dissolved salts with hydrochloric acid, in dilute hydrochloric acid medium, atomic absorption spectrometer wave 240.7nm at length, using air - acetylene flame measured absorbance of cobalt, calculated the amount of cobalt.

3 Reagents

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

3.1 hydrochloride (rho1.19g/mL).

Nitrate 3.2 (rho1.42g/mL).

3.3 Hydrofluoric acid (rho1.13g/mL).

3.4 perchloric acid (rho1.67g/mL).

3.5 nitric acid (11).

3.6 cobalt standard stock solution. Weigh 1.0000g metal cobalt (wCo>=99.95%), placed in 300mL beaker, add 30mL of nitric acid (3.5) to dissolve completely get rid of nitrogen oxides and heated to boiling, cooled to room temperature and removed, transferred to 1000mL volumetric flask, dilute to the mark with water Degree, and mix. 1mL solution containing 1mg cobalt.

3.7 cobalt standard solution. Pipette 10.00mL cobalt standard stock solution (3.6) in 200mL volumetric flask, was added 10mL of nitric acid (3.5), Dilute with water to volume, and mix. This solution 1mL containing 50µg cobalt.

4 Instrument

Atomic absorption spectrometer, with cobalt hollow cathode lamp.

Under optimum working conditions for those who can reach the following indicators can be used.

--- Characteristic concentration. the test solution is consistent with the measurement of the solution, the concentration of cobalt features should not exceed 0.07µg/mL.

--- Precision. standard solution with the highest concentration of 10 times the absorbance measurements, the standard deviation should not exceed 0.3% of the average absorbance;

The lowest concentration of standard solution used (instead of "zero" standard solution) absorbance measured 10 times, and the standard deviation should not exceed the maximum concentration 0.5% of the mean absorbance of standard solution.

--- Linear curve. The curve is divided into five sections according to concentration, absorbance difference between the absorbance difference between the highest and the lowest segment of the segment Ratio of not less than 0.70.