Ys T 252 3 2007 Translated English Of Chinese Standard Ys T 252 3 2007 Yst252 3 2007

This Part specifies the method for determination of cobalt content in high nickel matte. This Part is applicable to the determination of cobalt content in high-nickel matte. Measuring range: 0.1% ~ 2%. 2 Method summary Decompose the sample with hydrochloric acid, nitric acid-potassium chlorate saturated solution. Use air-acetylene flame in hydrochloric acid (2 + 98) medium, to measure the absorbance at the wavelength of 240.7 nm of atomic absorption spectrometer, after subtracting the background. Calculate the cobalt content according to the standard curve method. 3 Reagents 3.1 Hydrochloric acid (¦Ñ1.19 g/mL). 3.2 Nitric acid (¦Ñ1.42 g/mL). 3.3 Nitric acid (1 + 1). 3.4 Ammonia (1 + 3). 3.5 Nitric acid-potassium chlorate saturated solution: Dissolve potassium chlorate in nitric acid (3.2) until saturated. 3.6 Cobalt standard storage solution: Weigh 1.0000 g of metallic cobalt (mass fraction of cobalt ¡Ý 99.95%). Slowly add 20 mL of nitric acid (3.3) into a 400 mL beaker. Cover with a watch glass. Heat at low temperature to completely dissolve. Remove it. Use water to rinse the watch glass and cup wall. Heat and boil to remove nitrogen oxides. Remove it. Cool to room temperature. Transfer it into a 1000 mL volumetric flask. Use water to wash the watch glass and cup wall. Combine the washing liquid into the volumetric flask. Use water to make the volume reach to the mark. 1 mL of this solution YS/T 252.3-2007 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 8 contains 1 mg of cobalt. 3.7 Cobalt standard solution: Pipette 20.00 mL of cobalt stand

This Part specifies the method for determination of iron content in high nickel matte. This Part is applicable to the determination of iron content in high nickel matte. Measuring range: 0.5% ~ 7%. 2 Method summary The sample is decomposed with hydrochloric acid, nitric acid-potassium chlorate saturated solution. In the hydrochloric acid medium of pH1.5 ~ pH3.0, iron (III) and sulfosalicylic acid form a reddish-brown complex, whose absorbance is measured at the wavelength of 545 nm with a spectrophotometer. Calculate the iron content according to the standard curve method. 3 Reagents 3.1 Hydrochloric acid (¦Ñ1.19 g/mL). 3.2 Hydrochloric acid (1 + 3). 3.3 Nitric acid (¦Ñ1.42 g/mL). 3.4 Ammonia (1 + 3). 3.5 Nitric acid-potassium chlorate saturated solution: Dissolve potassium chlorate in nitric acid (3.3) until saturated. 3.6 Sulfosalicylic acid solution (100 g/L): Weigh 10 g of sulfosalicylic acid. Dissolve it in water and dilute it to 100 mL. Adjust it to about pH2 with ammonia water (3.4). 3.7 Iron standard solution: Weigh 0.1500 g of metallic iron (mass fraction of iron ¡Ý 99.9%). Place it in a 250 mL beaker. Add 20 mL of nitric acid (1 + 1). Heat to completely dissolve. Boil to drive out nitrogen oxides. Remove it. Cool to room temperature. Transfer to a 1000 mL volumetric flask. Use water to make the volume reach to the mark. 1 mL of this solution contains 0.15 mg of iron. YS/T 252.2-2007 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 8 4 Instruments Spectrophotometer. 5 Analytical procedures 5.1 Sample Weigh 0.400 g of sample, accurate to 0.0001

This Part specifies the method for determination of sulfur content in high nickel matte. This Part is applicable to the determination of sulfur content in high nickel matte. Measuring range: 15% ~ 25%. 2 Method summary The sample uses copper wire as flux and burns in air flow at 1250 ¡ãC ~ 1300 ¡ãC, to convert sulfur into sulfur dioxide. It is absorbed and oxidized into sulfuric acid by hydrogen peroxide. Methyl red-methylene blue solution is used as a mixed indicator. Use sodium hydroxide standard titration solution to make titration, until the solution changes from purple to bright green, which is taken as the end point. 3 Reagents 3.1 Copper wire (mass fraction of copper ¡Ý 99.95%, diameter 0.25 mm ~ 0.5 mm). 3.2 Acid absorption solution (potassium dichromate-sulfuric acid solution): Heat and dissolve 5 g of potassium dichromate with a small amount of water. After cooling, add 100 mL of sulfuric acid. 3.3 Desiccant: Anhydrous calcium chloride. 3.4 Alkali absorption solution: Sodium hydroxide (50 g/L). 3.5 Phenolphthalein indicator (10 g/L), ethanol solution. 3.6 Methyl red-methylene blue mixed indicator: Weigh 0.3 g of methyl red and 0.25 g of methylene blue. Dissolve in 500 mL of absolute ethanol. 3.7 Hydrogen peroxide absorption solution (pre

This Part specifies the method for determination of nickel content in high nickel matte. This Part is applicable to the determination of nickel content in high-nickel matte. Measuring range: 20% ~ 80%. 2 Method summary The sample is decomposed with hydrochloric acid or nitric acid-potassium chlorate saturated solution. In the ammonia medium, nickel and diacetyl oxime form a red nickel diacetyl oxime precipitate, which is separated from other impurity elements. The precipitate is filtered, washed, and dried to constant weight; the amount of nickel is calculated. The amount of nickel in the mixed filtrate is extracted with chloroform under pH6.5, separated from other impurities, measured using diacetyl oxime spectrophotometry and then corrected. 3 Reagents 3.1 Hydrochloric acid (¦Ñ1.19 g/mL). 3.2 Hydrochloric acid (1 + 1). 3.3 Hydrochloric acid (1 + 24). 3.4 Nitric acid (¦Ñ1.42 g/mL). 3.5 Nitric acid (1 + 1). 3.6 Sulfuric acid (¦Ñ1.83 g/mL). 3.7 Ammonia (1 + 1). 3.8 Chloroform. 3.9 Nitric acid-potassium chlorate saturated solution: Dissolve potassium chlorate in YS/T 252.1-2007 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 10 nitric acid (3.4) until saturated. 3.10 Potassium sodium tartrate solution (200 g/L), filter it before use. 3.11 Ammonium acetate solution (200 g/L), filter it before use. 3.12 Sodium thiosulfate solution (200 g/L), filter it before use. 3.13 Dimethylglyoxime ethanol solution (10 g/L), filter it before use. 3.14 Dimethylglyoxime-sodium hydroxide solution (10 g/L): Dissolve 15 g of sodium hydroxide in 100 mL of water. After cooling to room temperature, dissolve 1 g of dimethylglyoxime in the solution. Mix well. 3.15 Ferric persulfate solution (50 g/L). 3.16 Nickel standard stock solution: Weigh 0.1000

This standard specifies the method for determination of copper content in high nickel matte. This standard is applicable to the determination of copper content in high nickel matte. Measuring range: 6% ~ 55%. 2 Method summary The sample is decomposed with hydrochloric acid and nitric acid-potassium chlorate saturated solution. The ammonium bifluoride is used to mask the iron and the solution is controlled at pH3.5 ~ pH4. Potassium iodide is added, to cause the copper to precipitate copper iodide and precipitate an equal amount of iodine. Use the starch solution as an indicator; use sodium thiosulfate standard titration solution to indirectly determine the amount of copper. 3 Reagents 3.1 Ammonium bifluoride. 3.2 Potassium iodide. 3.3 Ammonia water (¦Ñ0.90 g/mL). 3.4 Hydrochloric acid (¦Ñ1.19 g/mL). 3.5 Nitric acid (¦Ñ1.42 g/mL). 3.6 Nitric acid (1 + 1). 3.7 Sulfuric acid (1 + 1). 3.8 Urea saturated solution. 3.9 Potassium sulfate solution (100 g/L). YS/T 252.4-2007 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 9 3.10 Nitric acid-potassium chlorate saturated solution: Dissolve potassium chlorate in nitric acid (3.5) until saturated. 3.11 Starch solution (5 g/L). 3.12 Copper standard solution: Accurately weigh 1.0000 g of metallic copper (mass fraction of copper ¡Ý 99.95%). Place it in a 400 mL beaker. Add 20 mL of nitric acid (3.6). Dissolve at low temperature and evaporate to a viscous state. Cool it. Add 5 mL of sulfuric acid (3.7). Heat until a lot of white smoke comes out. Cool it slightly. Add water to boil to dissolve the salts. Cool to room temperature. Pipette it into a 1000 mL volumetric flask. Use water to make the volume reach to the mark. 1 mL of this solution contains 1.0 mg of co

This Part specifies the determination of silicon dioxide content in bauxite. This Part is applicable to the determination of silicon dioxide content in bauxite; the measurement range: 15.00%.

This part specifies the determination method for the loss on ignition of bauxite. This part applies to determination of the loss on ignition in the bauxite ore, AND the determination range is 10% ~ 30%.

This Part specifies the determination of ferric oxide content in the bauxite. This Part is applicable to the determination of ferric oxide content in the bauxite; the determination range: 5.00%.