YS/T 820.7-2012Methods for chemical analysis of laterite nickel ores. Part 7: Determination of calcium and magnesium 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 by 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 7. 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 Limited.

Participated in the drafting of this section. People's Republic of China, Nantong Exit Inspection and Quarantine, Beijing General Research Institute of Mining, Zijin Mining Group the company.

1 Scope

This section YS/T 820 specifies the method for determination of nickel laterite calcium and magnesium content.

This section applies to the determination of calcium and magnesium content of nickel laterite ore. Measurement range. Ca. 0.05% to 0.30%; Mg. 0.40% to 2.50%.

2 Method summary

Samples with hydrochloric acid, nitric acid, hydrofluoric acid and perchloric acid decomposition. Dissolved salts with hydrochloric acid, in dilute hydrochloric acid and strontium salt solution medium, in an atomic absorption Close spectrometer at a wavelength of 422.7nm, using air - acetylene flame measured absorbance calcium, calculated. Atomic absorption spectrometer wavelength 285.2nm at using air - acetylene flame measured absorbance magnesium calculated amount of magnesium.

3 Reagents

Unless otherwise indicated in the analysis using only confirmed for the gifted class pure 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 (rho1.15g/mL).

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

3.5 nitric acid (11).

3.6 strontium salt solution (200g/L). Weigh 50g strontium chloride in 400mL beaker, dissolved in water and transferred to 250mL volumetric flask with water Dilute to volume, and mix.

3.7 Calcium standard stock solution. Weigh 0.6996g of calcium oxide (wCaO>=99.99%, previously at 105 °C ± 5 °C under drying 2h, dry place Desiccator, cooled to room temperature), placed in a beaker of 250mL, was added 20mL of hydrochloric acid (3.1), cover sheet pan, low dissolution was complete, remove the cooling to room temperature and transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL containing 0.5mg of calcium.

3.8 Calcium standard solution. Pipette 20.00mL calcium standard stock solution (3.7) in 500mL volumetric flask, dilute with water to volume, and mix.

This solution 1mL containing 20µg calcium.

3.9 Magnesium standard stock solution. Weigh 0.1658g of magnesium oxide (wMgO>=99.99%, previously at 800 °C ± 5 °C to constant weight by burning and dry Desiccator, cooled to ambient temperature) was placed in a beaker of 250mL, 20mL of nitric acid was added (3.5) to dissolve completely get rid of nitrogen oxides and heated to boiling, taking Cool to room temperature and transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL containing 0.1mg of magnesium.

3.10 Magnesium standard solution. Pipette 20.00mL magnesium standard stock solution (3.9), in 200mL volumetric flask, dilute to the mark, mix uniform. This solution 1mL containing 10µg magnesium.

4 Instrument

Atomic absorption spectrometer, with calcium, magnesium hollow cathode lamp.