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Method for measuring arsenic content of gold ore
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A gold mine and content technology, applied in the field of analytical chemistry, can solve the problems of narrow measurement range, unsafe, unfavorable promotion, etc., and achieve the effect of high accuracy and wide measurement range
Inactive Publication Date: 2017-12-01
CHANGCHUN GOLD RES INST
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At present, the commonly used methods for determining arsenic in gold mines are: spectrophotometry, base phosphate titration and iodometric method, etc. Among them, DDTC-Ag salt spectrophotometry has been popularized in the determination and analysis of arsenic content, but this method needs to use Harmful chloroform reagents seriously pollute the environment and affect the health of the staff, and the measurement range is narrow; the base phosphate titration method uses sodium arsenite and arsenic trioxide highly toxic reagents in the measurement process, which will cause serious pollution to the environment , and the reagent is a precursor drug. According to the newly promulgated "Narcotics Law of the People's Republic of China" in 2017, the reagent is controlled, which limits the implementation and promotion of the method; Benzene reagent is neither safe nor environmentally friendly, so this method is not conducive to popularization in practical applications; in summary, due to the safety and environmental problems caused by the reagents used in the method for determining the arsenic content in gold mines, serious Affected the application and popularization of analytical methods for the determination of arsenic content in gold mines
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Embodiment 1
[0077] A method for measuring arsenic content in gold ore, the specific steps are as follows:
[0078] Step 1. After pulverizing and drying the gold ore with a particle size of 0.038-0.074 mm, accurately weigh 0.5000 g of the sample and put it into a nickel crucible, then add 4 g of sodium peroxide-sodium carbonate mixed solvent, and stir evenly;
[0079] Step 2, placing the nickel crucible in a muffle furnace with a temperature of 650° C. for melting for 5 minutes;
[0080] Step 3. Take out the nickel crucible from the muffle furnace, place it for 10 minutes, put the whole nickel crucible into a 250mL beaker filled with 60mL boiling water, then cover the beaker with a watch glass, heat and boil for 10 minutes, then wash the nickel crucible with water The substance was purged into another empty beaker and the nickel crucible was removed;
[0081] Step 4: Add 1mL of 30% hydrogen peroxide solution to the above beaker, boil for 10 minutes, cool to room temperature, then transfer...
Embodiment 2
[0107] A method for measuring arsenic content in gold ore, the specific steps are as follows:
[0108] Step 1. After pulverizing and drying the gold ore with a particle size of 0.038-0.074 mm, accurately weigh 1.0000 g of the sample and put it into a nickel crucible, then add 6 g of sodium peroxide-sodium carbonate mixed solvent, and stir evenly;
[0109] Step 2, placing the nickel crucible in a muffle furnace with a temperature of 700°C for 10 minutes;
[0110] Step 3. Take out the nickel crucible from the muffle furnace, place it for 10 minutes, put the whole nickel crucible into a 250mL beaker filled with 60mL boiling water, then cover the beaker with a watch glass, heat and boil for 10 minutes, then wash the nickel crucible with water The substance was purged into another empty beaker and the nickel crucible was removed;
[0111] Step 4: Add 3mL of 30% hydrogen peroxide solution to the above beaker, boil for 10 minutes, cool to room temperature, then transfer the content ...
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Abstract
The invention belongs to the technical field of analytical chemistry, and particularly relates to a method for measuring the arsenic content of a gold ore. According to the method, a gold ore sample is molten by the aid of sodium dioxide and sodium carbonate and extracted by the aid of water, solution is acidified by sulfuric acid and reduced by potassium iodide, elements such as lead, tin and zinc are complexed by sodium tartrate, and the arsenic content is titrated by Iodine standard solution. According to the method, sodium thiosulfate replaces arsenic trioxide to perform calibration, an experimental process does not relate poisonous and harmful drugs, and the method is safe and environmentally friendly and solves the problems that environments are polluted as the arsenic content of the gold ore is measured by the aid of poisonous and harmful substances, and test analysis cannot be performed as toxic drugs are controlled. The method is high in accuracy, wide in measuring range, suitable for test analysis of mass samples and widely applied to the field of test analysis of the gold ore.
Description
technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method for measuring arsenic content in gold ore. Background technique [0002] Arsenic is a poisonous and harmful element. It is enriched in nature. The discharge of arsenic-containing wastewater in industrial production will cause serious pollution to the environment. Especially in metal smelting, arsenic will corrode steel furnaces and pipes. Therefore, accurate Determination of arsenic content in ore is critical to the environment as well as the development of the industry. At present, the commonly used methods for determining arsenic in gold mines are: spectrophotometry, base phosphate titration and iodometric method, etc. Among them, DDTC-Ag salt spectrophotometry has been popularized in the determination and analysis of arsenic content, but this method needs to use Harmful chloroform reagents seriously pollute the environment and affect the heal...
Claims
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