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A method for removing arsenic from coal

A technology for coal and arsenic removal, applied in separation methods, chemical instruments and methods, fuels, etc., can solve environmental hazards and other problems, achieve the effects of promoting leaching, facilitating subsequent processing, and increasing leaching rates

Active Publication Date: 2020-08-11
青岛赛诺威尔工业水处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although arsenic can be enriched on the surface of fly ash, the emission of arsenic can be effectively reduced by dust removal, but if the arsenic in fly ash is not properly treated, it will also cause serious harm to the environment
[0003] The arsenic in coal includes inorganic arsenic, organic arsenic, etc. Most of them are inorganic arsenic. Nitric acid can be used to leach inorganic arsenic in coal to achieve the purpose of coal arsenic removal, but this method needs to consume acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The composite additive in this embodiment is made up of ferric sulfate, aluminum sulfate, sodium chloride, aluminum chloride and ferric chloride, and the mass percent of ferric sulfate, aluminum sulfate, sodium chloride, aluminum chloride and ferric chloride in the composite additive 50%, 24%, 8%, 8%, and 10%, respectively.

[0021] The solid-to-liquid mass ratio of coal and water in the high-arsenic coal slurry is 1:10, the pH value of the slurry is 2, the temperature is 50°C, and the concentration of the compound additive is 1550mg / L. It is used to circulate and wash the flue gas containing sulfur dioxide. The leaching rate of inorganic arsenic reached 93%, the pentavalent arsenic in the leaching solution accounted for 92% of the total arsenic, and the flue gas desulfurization rate was 95%. Arsenic accounts for 14% of the total arsenic, and the flue gas desulfurization rate is 84%.

Embodiment 2

[0023] The composite additive in the present embodiment is made up of sodium chloride, aluminum chloride, magnesium chloride and calcium chloride, and the mass percent of sodium chloride, aluminum chloride, magnesium chloride and calcium chloride in the composite additive is respectively 6%, 84%, 5% and 5%.

[0024] The solid-to-liquid mass ratio of coal and water in the high-arsenic coal slurry is 1:20, the pH value of the slurry is 1.4, the temperature is 50°C, and the concentration of the compound additive is 950mg / L. It is used to circulate and wash the flue gas containing sulfur dioxide. The leaching rate of inorganic arsenic reached 97%, the pentavalent arsenic in the leachate accounted for 96% of the total arsenic, and the flue gas desulfurization rate was 91%. Arsenic accounts for 16% of the total arsenic, and the flue gas desulfurization rate is 66%.

Embodiment 3

[0026] The composite additive in the present embodiment is made up of ferric sulfate, sodium chloride, ferric chloride, magnesium chloride and calcium chloride, and the mass percentage of ferric sulfate, sodium chloride, ferric chloride, magnesium chloride and calcium chloride in the composite additive is respectively 30%, 5%, 60%, 3% and 2%.

[0027] The solid-to-liquid mass ratio of coal and water in the high-arsenic coal slurry is 1:20, the pH value of the slurry is 1.4, the temperature is 50°C, and the concentration of the compound additive is 1350mg / L. It is used to circulate and wash the flue gas containing sulfur dioxide. The leaching rate of state arsenic can reach 96%, the pentavalent arsenic in the leaching solution accounts for 93% of the total arsenic, and the flue gas desulfurization rate is 90%. Valence arsenic accounts for 14% of the total arsenic, and the flue gas desulfurization rate is 68%

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Abstract

The invention discloses a coal dearsenification method and an additive thereof, and belongs to the technical field of coal and smoke gas purification. The additive is a composite additive prepared from at least one of aluminum chloride, ferric chloride, sodium chloride, magnesium chloride, calcium chloride, ferric sulfate and aluminum sulfate or prepared according to a certain proportion. The additive is added into coal slurry, and is used for washing smoke gas containing sulfur dioxide; inorganic arsenium in the coal is leached out by the sulfur dioxide; meanwhile, the smoke gas desulfurization is realized. The used additive can promote the leaching of the inorganic arsenium in the coal and / or can accelerate the oxidization of trivalent arsenic in the leaching liquid into pentavalent arsenic, so that the toxicity of the arsenium is reduced; the subsequent treatment of the leached arsenium is facilitated.

Description

technical field [0001] The invention relates to a method for removing arsenic from coal and an additive used therefor, belonging to the technical field of coal and flue gas purification. Background technique [0002] my country's energy is dominated by coal. Coal contains arsenic, a harmful trace element. During coal combustion, most of the arsenic in coal can be released into the air, which can cause serious harm to the environment. Although arsenic can be enriched on the surface of fly ash, the emission of arsenic can be effectively reduced by dust removal, but if the arsenic in fly ash is not properly treated, it will also cause serious harm to the environment. [0003] Arsenic in coal includes inorganic arsenic, organic arsenic, etc. Most of them are inorganic arsenic. Nitric acid can be used to leach inorganic arsenic in coal to achieve the purpose of coal arsenic removal, but this method needs to consume acid. The common valence states of arsenic in the leaching solu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/02C10L9/10B01D53/78B01D53/50
CPCB01D53/50B01D53/78B01D2258/0283C10L9/02C10L9/10C10L2290/22
Inventor 孙文寿郭远峰张敬帅
Owner 青岛赛诺威尔工业水处理有限公司
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