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GB/T 8152.14-2019 PDF English

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GB/T 8152.14-2019: Methods for chemical analysis of lead concentrates -- Part 14: Determination of silicon dioxide content -- Molybdenum blue spectrophotometry
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GB/T 8152.14-2019119 Add to Cart 3 days Methods for chemical analysis of lead concentrates -- Part 14: Determination of silicon dioxide content -- Molybdenum blue spectrophotometry Valid

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GB/T 8152.14-2019: Methods for chemical analysis of lead concentrates -- Part 14: Determination of silicon dioxide content -- Molybdenum blue spectrophotometry


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(Methods for chemical analysis of lead concentrates - Part 14. Determination of silica content) ICS 77.120.60 H13 National Standards of People's Republic of China Lead concentrates - Methods of chemical analysis - Part 14 Determination of silica content - Molybdenum blue spectrophotometric method Methodsforchemicalanalysisofleadconcentrates- Part 14. Determinationofsilicondioxidecontent- Molybdenumbluespectrophotometry Published on.2019-08-30 2020-07-01 implementation State market supervision and administration China National Standardization Administration issued

Foreword

GB/T 8152 "Leading Concentrate Chemical Analysis Method" is divided into 14 parts. --- Part 1. Determination of lead content - Acid dissolution - EDTA titration; --- Part 2. Determination of lead content - lead sulfate precipitation - EDTA back titration; --- Part 3. Determination of aluminium oxide content - chrome azure S spectrophotometric method; ---Part 4. Determination of zinc content EDTA titration; ---Part 5. Determination of arsenic content by atomic fluorescence spectrometry; --- Part 6. Polarographic determination of strontium content; ---Part 7. Determination of copper content by flame atomic absorption spectrometry; --- Part 8. Determination of bismuth content by dithiodiantipyrymethane spectrophotometry; ---Part 9. Determination of magnesium oxide content by flame atomic absorption spectrometry; ---Part 10. Determination of silver content and gold content - lead or ash blasting test and flame atomic absorption spectroscopy; --- Part 11. Determination of mercury content by atomic fluorescence spectrometry; ---Part 12. Determination of cadmium content by flame atomic absorption spectrometry; --- Part 13. Determination of bismuth content - Inductively coupled plasma mass spectrometry and inductively coupled plasma-atomic emission Spectral method -- Part 14. Determination of silica content - Molybdenum blue spectrophotometric method. This part is the 14th part of GB/T 8152. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part was proposed by the China Nonferrous Metals Industry Association. This part is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243). This section drafted by. North Mine Detection Technology Co., Ltd., Guangdong Industrial Analysis and Testing Center, Shaoguan City, Guangdong Province, quality measurement supervision Institute of Testing, Jiangxi Copper Lead-Zinc Metal Co., Ltd., Zhangzhou Jingui Yinye Co., Ltd., China Nonferrous Guilin Institute of Mineral Geology Company, Hunan Nonferrous Metals Research Institute, Shenzhen Zhongjin Lingnan Nonferrous Metals Co., Ltd., Tongling Nonferrous Metals Group Holdings Co., Ltd. Division, Nantong Entry-Exit Inspection and Quarantine Bureau Inspection and Quarantine Comprehensive Technology Center, Hunan Non-ferrous Geological Exploration Research Institute, Kunming Metallurgical Research Institute. The main drafters of this section. Ma Li, Yan Guishen, Xie Hui, Yuan Qi, Tang Huaquan, Zeng Long, Lu Meiling, Liu Juan, Gu Li, Wang Jinping, Wang Chaoying, Wei Xianghui, Liu Weili, Zhang Yongjin, Qiu Weiming, Dai Bin, Chen Xiaoshan, Hu Wei, Zhang Xuelian, Wang Tingxiang, Ye Xin, Li Guowei, Wang Wei, Shi Wei. Lead concentrates - Methods of chemical analysis - Part 14 Determination of silica content - Molybdenum blue spectrophotometric method

1 Scope

This part of GB/T 8152 specifies the method for determining the silica content of lead concentrate. This section applies to the determination of silica in lead concentrate by molybdenum blue spectrophotometry. Measuring range. 0.30%~6.70%.

2 Method summary

The sample is melt-decomposed with potassium hydroxide at 750 ° C to 800 ° C. In a hydrochloric acid medium, silicon and ammonium molybdate form silicon molybdenum heteropoly acid to sulfuric acid. Ferrous ammonium-ascorbic acid reduced silicon molybdenum heteropoly acid is silicon molybdenum blue. The absorbance was measured at a wavelength of 650 nm of the spectrophotometer.

3 reagents

Unless otherwise stated, only reagents identified as superior grade and distilled or deionized water or water of comparable purity were used in the analysis. 3.1 Mixing flux. Mix two parts of anhydrous sodium carbonate with one part of boric acid. 3.2 Potassium hydroxide. 3.3 Ammonium ferrous sulfate. 3.4 Oxalic acid. 3.5 Ascorbic acid. 3.6 Sulfuric acid (ρ=1.84g/mL). 3.7 Hydrochloric acid (ρ = 1.19 g/mL). 3.8 Hydrochloric acid (1 1). 3.9 Hydrochloric acid (1 6). 3.10 Hydrochloric acid (8 92). 3.11 Potassium hydroxide solution (200g/L). 3.12 Ammonium molybdate solution (100g/L). Weigh 50g of ammonium molybdate in a 500mL beaker, add 400mL of boiling water, stir until dissolved Whole, diluted to 500mL. 3.13 Phenolphthalein indicator (10g/L). Weigh 1g of phenolphthalein in 100mL of ethanol. 3.14 Reducing solution. Weigh 8.4g ammonium ferrous sulfate (3.3), 10.9g oxalic acid (3.4), 0.68g ascorbic acid (3.5) in 1000mL beaker Add.200 mL of water, slowly add 45.5 mL of sulfuric acid (3.6), stir while stirring, and dilute to 500 mL after the dissolution is complete. 3.15 Silica standard storage solution. Weigh 0.2500g of superior pure silica (pre-fired at 950 °C for 30min, placed in the dryer In the middle of cooling to room temperature) in a platinum crucible containing 5g of mixed flux (3.1), mix, and then cover 2g of mixed flux (3.1), placed at 900 ° C ~ Melt in a high temperature furnace at 950 ° C for 1 h, take out, slightly cold, rinse the bottom of the crucible with water, place in a 300 mL Teflon beaker, add Immerse in 150 mL of hot water, wash it, cool to room temperature, transfer to a 500 mL volumetric flask, dilute to the mark with water, and mix. Immediately transfer to plastic Store in the bottle. 1 mL of this solution contained 500 μg of silica. 3.16 Silica standard solution. Pipette 5.00mL of silica standard storage solution (3.15), place in a 100mL volumetric flask, dilute with water Release to the scale and mix. Immediately transfer to a plastic bottle for storage. 1 mL of this solution contained 25 μg of silica. GB/T 8152.14-2019 (Methods for chemical analysis of lead concentrates - Part 14. Determination of silica content) ICS 77.120.60 H13 National Standards of People's Republic of China Lead concentrates - Methods of chemical analysis - Part 14 Determination of silica content - Molybdenum blue spectrophotometric method Methodsforchemicalanalysisofleadconcentrates- Part 14. Determinationofsilicondioxidecontent- Molybdenumbluespectrophotometry Published on.2019-08-30 2020-07-01 implementation State market supervision and administration China National Standardization Administration issued

Foreword

GB/T 8152 "Leading Concentrate Chemical Analysis Method" is divided into 14 parts. --- Part 1. Determination of lead content - Acid dissolution - EDTA titration; --- Part 2. Determination of lead content - lead sulfate precipitation - EDTA back titration; --- Part 3. Determination of aluminium oxide content - chrome azure S spectrophotometric method; ---Part 4. Determination of zinc content EDTA titration; ---Part 5. Determination of arsenic content by atomic fluorescence spectrometry; --- Part 6. Polarographic determination of strontium content; ---Part 7. Determination of copper content by flame atomic absorption spectrometry; --- Part 8. Determination of bismuth content by dithiodiantipyrymethane spectrophotometry; ---Part 9. Determination of magnesium oxide content by flame atomic absorption spectrometry; ---Part 10. Determination of silver content and gold content - lead or ash blasting test and flame atomic absorption spectroscopy; --- Part 11. Determination of mercury content by atomic fluorescence spectrometry; ---Part 12. Determination of cadmium content by flame atomic absorption spectrometry; --- Part 13. Determination of bismuth content - Inductively coupled plasma mass spectrometry and inductively coupled plasma-atomic emission Spectral method -- Part 14. Determination of silica content - Molybdenum blue spectrophotometric method. This part is the 14th part of GB/T 8152. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part was proposed by the China Nonferrous Metals Industry Association. This part is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243). This section drafted by. North Mine Detection Technology Co., Ltd., Guangdong Industrial Analysis and Testing Center, Shaoguan City, Guangdong Province, quality measurement supervision Institute of Testing, Jiangxi Copper Lead-Zinc Metal Co., Ltd., Zhangzhou Jingui Yinye Co., Ltd., China Nonferrous Guilin Institute of Mineral Geology Company, Hunan Nonferrous Metals Research Institute, Shenzhen Zhongjin Lingnan Nonferrous Metals Co., Ltd., Tongling Nonferrous Metals Group Holdings Co., Ltd. Division, Nantong Entry-Exit Inspection and Quarantine Bureau Inspection and Quarantine Comprehensive Technology Center, Hunan Non-ferrous Geological Exploration Research Institute, Kunming Metallurgical Research Institute. The main drafters of this section. Ma Li, Yan Guishen, Xie Hui, Yuan Qi, Tang Huaquan, Zeng Long, Lu Meiling, Liu Juan, Gu Li, Wang Jinping, Wang Chaoying, Wei Xianghui, Liu Weili, Zhang Yongjin, Qiu Weiming, Dai Bin, Chen Xiaoshan, Hu Wei, Zhang Xuelian, Wang Tingxiang, Ye Xin, Li Guowei, Wang Wei, Shi Wei. Lead concentrates - Methods of chemical analysis - Part 14 Determination of silica content - Molybdenum blue spectrophotometric method

1 Scope

This part of GB/T 8152 specifies the method for determining the silica content of lead concentrate. This section applies to the determination of silica in lead concentrate by molybdenum blue spectrophotometry. Measuring range. 0.30%~6.70%.

2 Method summary

The sample is melt-decomposed with potassium hydroxide at 750 ° C to 800 ° C. In a hydrochloric acid medium, silicon and ammonium molybdate form silicon molybdenum heteropoly acid to sulfuric acid. Ferrous ammonium-ascorbic acid reduced silicon molybdenum heteropoly acid is silicon molybdenum blue. The absorbance was measured at a wavelength of 650 nm of the spectrophotometer.

3 reagents

Unless otherwise stated, only reagents identified as superior grade and distilled or deionized water or water of comparable purity were used in the analysis. 3.1 Mixing flux. Mix two parts of anhydrous sodium carbonate with one part of boric acid. 3.2 Potassium hydroxide. 3.3 Ammonium ferrous sulfate. 3.4 Oxalic acid. 3.5 Ascorbic acid. 3.6 Sulfuric acid (ρ=1.84g/mL). 3.7 Hydrochloric acid (ρ = 1.19 g/mL). 3.8 Hydrochloric acid (1 1). 3.9 Hydrochloric acid (1 6). 3.10 Hydrochloric acid (8 92). 3.11 Potassium hydroxide solution (200g/L). 3.12 Ammonium molybdate solution (100g/L). Weigh 50g of ammonium molybdate in a 500mL beaker, add 400mL of boiling water, stir until dissolved Whole, diluted to 500mL. 3.13 Phenolphthalein indicator (10g/L). Weigh 1g of phenolphthalein in 100mL of ethanol. 3.14 Reducing solution. Weigh 8.4g ammonium ferrous sulfate (3.3), 10.9g oxalic acid (3.4), 0.68g ascorbic acid (3.5) in 1000mL beaker Add.200 mL of water, slowly add 45.5 mL of sulfuric acid (3.6), stir while stirring, and dilute to 500 mL after the dissolution is complete. 3.15 Silica standard storage solution. Weigh 0.2500g of superior pure silica (pre-fired at 950 °C for 30min, placed in the dryer In the middle of cooling to room temperature) in a platinum crucible containing 5g of mixed flux (3.1), mix, and then cover 2g of mixed flux (3.1), placed at 900 ° C ~ Melt in a high temperature furnace at 950 ° C for 1 h, take out, slightly cold, rinse the bottom of the crucible with water, place in a 300 mL Teflon beaker, add Immerse in 150 mL of hot water, wash it, cool to room temperature, transfer to a 500 mL volumetric flask, dilute to the mark with water, and mix. Immediately transfer to plastic Store in the bottle. 1 mL of this solution contained 500 μg of silica. 3.16 Silica standard solution. Pipette 5.00mL of silica standard storage solution (3.15), place in a 100mL volumetric flask, dilute with water Release to the scale and mix. Immediately transfer to a plastic bottle for storage. 1 mL of this solution contained 25 μg of silica. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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