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Method for determining arsenic content in ore

A technology of ore and content, applied in the field of analytical chemistry, to achieve the effect of high accuracy and wide measurement range

Inactive Publication Date: 2018-06-12
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of environmentally friendly and non-toxic reagents involved in the determination of arsenic in ores, the present invention provides a method for determining the arsenic content in ores. Potassium dichromate is used to replace iodine in the traditional base phosphate titration method, and sulfurous acid Ferric ammonium replaces the toxic sodium arsenite reagent in the traditional base phosphate titration method. Compared with the traditional base phosphate titration method, this method avoids the use of sodium arsenite medicine, has a non-toxic and environmentally friendly effect, and is also To avoid the problem of toxic drug control and environmental pollution caused by the use of arsenic trioxide, this method uses potassium dichromate and ferrous ammonium sulfate reagents for joint titration, avoiding the use of toxic and harmful reagents, which is safe and environmentally friendly, and the method is simple to operate , wide measurement range, accurate measurement results, suitable for test and analysis of a large number of samples, can be widely used in the field of test and analysis of arsenic content in ores, this method is suitable for the analysis of ores with arsenic content of 0.15% to 10%

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  • Method for determining arsenic content in ore

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Using GBW 07278 arsenic ore national first-class standard material to carry out experiments, verify the precision and accuracy of the method, a method for measuring arsenic content in ore, the specific steps are as follows:

[0043] Step 1, the ore that particle size is 0.038~0.074mm is pulverized, dried and weighed 0.2000g sample and puts into 500mL conical flask, then adds 15mL concentrated nitric acid;

[0044] Step 2, place the above-mentioned Erlenmeyer flask on the electric stove and heat for 2 minutes;

[0045] Step 3, take off the Erlenmeyer flask from the electric stove, add 0.3g potassium chlorate, then place the Erlenmeyer flask on the electric stove to heat, after the sample is completely dissolved, take it off and cool;

[0046] Step 4, add 10mL (1+1) sulfuric acid to the Erlenmeyer flask, rinse the bottle wall with water, heat to emit sulfur trioxide smoke, keep the smoke state for 3min, remove and cool;

[0047]Step 5. Add 30mL water to the Erlenmeyer fl...

Embodiment 2

[0081] Adopt YSS021-2004 copper concentrate national primary standard material to carry out experiment, verify the precision and accuracy of the method, a kind of method for measuring arsenic content in ore, concrete steps are as follows:

[0082] Step 1, the ore that particle size is 0.038~0.074mm is pulverized, dried and weighed 0.3000g sample and puts into 500mL conical flask, then adds 18mL concentrated nitric acid;

[0083] Step 2, place the above-mentioned Erlenmeyer flask on the electric stove and heat for 3 minutes;

[0084] Step 3, take off the Erlenmeyer flask from the electric stove, add 0.4g potassium chlorate, then place the Erlenmeyer flask on the electric stove to heat, after the sample is completely dissolved, take it off and cool it;

[0085] Step 4, add 12mL (1+1) sulfuric acid into the Erlenmeyer flask, rinse the bottle wall with water, heat to emit thick smoke of sulfur trioxide, keep the state of emitting dense smoke for 4min, take it off and cool;

[008...

Embodiment 3

[0120] Adopt GBW07175 antimony ore national primary standard material to carry out experiment, the precision and accuracy of verification method, a kind of method for measuring arsenic content in ore, concrete steps are as follows:

[0121] Step 1, the ore that particle size is 0.038~0.074mm is pulverized, dried and weighed 0.5000g sample is put into 500mL conical flask, then adds 20mL concentrated nitric acid;

[0122] Step 2, place the above-mentioned Erlenmeyer flask on the electric stove and heat for 5 minutes;

[0123] Step 3, take off the Erlenmeyer flask from the electric stove, add 0.5g potassium chlorate, then place the Erlenmeyer flask on the electric stove to heat, after the sample is completely dissolved, take it off and cool it;

[0124] Step 4, add 15mL (1+1) sulfuric acid in the Erlenmeyer flask, rinse the bottle wall with water, heat to emit thick smoke of sulfur trioxide, keep the state of emitting dense smoke for 5min, take off and cool;

[0125] Step 5. Add...

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Abstract

The invention belongs to the technical field of analytical chemistry, and particularly relates to a method for determining arsenic content in ore. Potassium dichromate is adopted to replace iodine inthe conventional hypophosphite titration method, and ammonium ferrous sulfate is adopted to replace poisonous sodium arsenite reagent in the conventional hypophosphite titration method. Compared withdetermination by conventional hypophosphite titration, the method avoids the usage of sodium arsenite medicine, achieving the a poison-less and environment-friendly effect, and also avoids the problemof poisonous chemical control and environmental pollution caused by the usage of arsenic trioxide. The method adopts potassium dichromate and ammonium ferrous sulfate for joint titration, avoiding the usage of poisonous and harmful reagents, so the method is not only safe but also environmentally friendly; moreover, the method is easy to operate, the range of determination is wide, determinationresults are accurate, and the method is suitable for the testing and analysis of samples in large batch, and can be widely applied in the field of testing and analysis of arsenic content in ore. The method is suitable for the analysis of ore with arsenic content of 0.15 to 10 percent.

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 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 ores is critical to the environment as well as the development of the geological industry. At present, the commonly used methods for determining arsenic in ores are: spectrophotometry, base phosphate titration and iodometric method; 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 reagent, which seriously pollutes the environment and affects the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 苏广东刘正红陈永红芦新根孟宪伟洪博
Owner CHANGCHUN GOLD RES INST
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