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Method for separating and detecting complicated mixed state arsenic in coal

A mixed-state and complex technology, applied in material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of high test cost, difficult development, and single information obtained, and achieve the effect of low test cost and short test time.

Inactive Publication Date: 2015-07-22
XINJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing detection technology, either according to the national standard, the arsenic content in the ash after high-temperature burning is determined by using the magnesium oxide arsenic fixation method; It is relatively high, the information obtained is single, and the requirements for testing equipment and personnel are high. It is not suitable for the actual testing business of enterprises and institutions. It cannot obtain complete detailed information on arsenic content in coal and its occurrence forms, and it is difficult to develop and optimize in a targeted manner. Flue gas conditioning of different sources and qualities of raw coal during combustion and post-treatment process and device for arsenic removal and arsenic fixation in flue gas after combustion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1.1 Pretreatment and sample preparation: Use a grinder to grind the raw coal numbered 1436 to 200 mesh, take 20g and put it in a constant temperature box, and heat it at 105°C for 24 hours to remove the moisture in the raw coal to obtain 1436a Raw coal dry base sample;

[0035] 1.2 Reagents used

[0036] 1.2.1 Deionized water

[0037] 1.2.2 Sodium dihydrogen phosphate solution, superior grade, 1mol / L

[0038] 1.2.3 Zinc chloride solution, superior grade, density 1.25g / cm 3

[0039] 1.2.4 Zinc chloride solution, superior grade, density 1.35g / cm 3

[0040] 1.2.5 Zinc chloride solution, superior grade, density 1.45g / cm 3

[0041] 1.2.6 Sodium hydroxide solution, superior grade, 1mol / L

[0042] 1.2.7 Mixed solution of nitric acid-hydrogen peroxide (mass fraction of hydrogen peroxide is 10%), superior grade

[0043] 1.2.8 N-Methylpyrrolidone, excellent grade

[0044] 1.2.9 n-Hexane, premium grade

[0045] 1.2.10 Mixed solution of n-hexane-ethyl acetate (volume fra...

Embodiment 2

[0061] 1.1 Pretreatment and sample preparation: Use a grinder to grind the raw coal numbered 1454 to 200 mesh, take 20g and put it in a constant temperature box, and heat it at 105°C for 24 hours to remove the moisture in the raw coal to obtain 1454a Raw coal dry base sample;

[0062] 1.2 Reagents used

[0063] 1.2.1 Deionized water

[0064] 1.2.2 Sodium dihydrogen phosphate solution, superior grade, 1mol / L

[0065] 1.2.3 Zinc chloride solution, superior grade, density 1.25g / cm 3

[0066] 1.2.4 Zinc chloride solution, superior grade, density 1.35g / cm 3

[0067] 1.2.5 Zinc chloride solution, superior grade, density 1.45g / cm 3

[0068] 1.2.6 Sodium hydroxide solution, superior grade, 1mol / L

[0069] 1.2.7 Mixed solution of nitric acid-hydrogen peroxide (mass fraction of hydrogen peroxide is 10%), superior grade

[0070] 1.2.8 N-Methylpyrrolidone, excellent grade

[0071] 1.2.9 n-Hexane, premium grade

[0072] 1.2.10 Mixed solution of n-hexane-ethyl acetate (volume fra...

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Abstract

The invention relates to detection of arsenic contents in raw coal used in such municipal administration and industries as a thermal power plant, a thermomax company, a coking plant, steelmaking, coal industry and the like. The invention provides an effective method for separating and detecting complicated mixed state arsenic in coal, and the method can be realized by common reagents and conventional instruments, thereby being convenient, quick and low in cost. The method is used for separating and measuring mixed inorganic and organic arsenic in different macroscopic coal ingredients in the coal by cooperatively utilizing density fractionation, sequential extraction and column chromatography. According to the method, the defects that the content of the arsenic element in the coal is low and the arsenic element belongs to a plurality of kinds of complicated mixed states to be difficultly separated and detected are overcome, such information of the arsenic element in the coal as enrichment characteristic, main speciation distribution and micro chemical structure can be obtained so as to judge the category and transportation law of arsenic-containing pollutants in residues, wastewater and waste gases generated in such coal processing and utilization procedures as coal washing and coal combustion, and therefore efficient arsenic removing and arsenic fixing processes can be typically developed and optimized.

Description

technical field [0001] The invention relates to the detection of arsenic content in raw coal used in thermal power plants, thermal power companies, coking, steelmaking, coal chemical industry and other municipal and industrial industries. The invention provides an effective method for separating and detecting complex mixed state arsenic in coal. Background technique [0002] my country is a big coal producing and consuming country. Coal production accounts for 37% of the world's total output, and coal combustion accounts for 75% of the total energy structure. Sulfur and nitrogen pollution produced during coal processing and utilization is already one of the environmental hazards strictly controlled by the Ministry of Environmental Protection. In the past ten years, trace harmful element pollution (such as mercury, arsenic, lead, cadmium pollution) in coal has become increasingly prominent. Arsenic is a neurotoxin. After the human body ingests arsenic through breathing, ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 赵志西陈平王帅
Owner XINJIANG NORMAL UNIVERSITY
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