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Method for intensifying coal arsenic leaching by using organic additive

An organic additive and additive technology, applied in the direction of improving process efficiency, can solve problems such as low arsenic leaching rate, achieve high arsenic removal effect, broad market application prospects, and reduce toxicity.

Active Publication Date: 2021-12-24
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

[0004] The arsenic in the coal can also be leached by using the oxygen and sulfur dioxide coexisting in the flue gas. This method can realize the desulfurization of the flue gas while leaching the harmful substances such as arsenic in the coal. Arsenic leaching rate is key

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example is a method of using organic additives to strengthen the leaching of arsenic from coal. In this method, a swirl plate tower is used as a mass transfer device, and the flue gas containing sulfur dioxide and oxygen enters from the lower part of the swirl plate tower. The coal slurry containing organic additives is The swirl tray is contacted with the flue gas for mass transfer reaction, the coal arsenic is leached, and the sulfur dioxide in the flue gas is oxidized to sulfate and removed; among them, the organic ligand additive is citric acid, and the concentration of citric acid in the coal slurry is 0.1mmol / L, the solid-to-liquid mass ratio of coal to water is 1:10, the pH value of the slurry is 2.5, and the temperature is 50°C. Soluble arsenic such as arsenic is continuously leached, the arsenic leaching rate is 80%, and the flue gas desulfurization rate is 91%.

[0018] In this embodiment, the combination of organic additives and ultraviolet light irradia...

Embodiment 2

[0021] In this embodiment, a bubble reactor is used as the mass transfer reaction equipment, and the flue gas containing sulfur dioxide is passed into the bubble reactor, and the flue gas and the coal slurry containing an organic additive are subjected to a contact mass transfer reaction in the reactor, and the organic additive is lemon The concentration of acid and citric acid in the slurry is 1mmol / L, the solid-to-liquid mass ratio of coal to water is 1:10, the pH value of the slurry is 1.8, and the temperature is 50°C. In the bubble reactor, the inorganic state in the coal Soluble arsenic such as arsenic is continuously leached, the leaching rate is 93%, and the flue gas desulfurization rate is 92%.

[0022] Under the same conditions above, when adding ultraviolet light irradiation, the leaching rate reaches 97%, the pentavalent arsenic in the leaching solution accounts for more than 90% of the total arsenic, and the flue gas desulfurization rate is 94%. When irradiated, th...

Embodiment 3

[0024] In this embodiment, a swirling plate tower is used as the mass transfer equipment, and the flue gas containing sulfur dioxide is passed into the swirling plate tower, and the flue gas in the tower and the coal slurry containing an organic additive undergo a contact mass transfer reaction, and the organic additive is citric acid , the concentration of citric acid in the slurry is 0.5mmol / L, the solid-to-liquid mass ratio of coal to water is 1:10, the pH value of the slurry is 2, and the temperature is 50°C. The flue gas, soluble arsenic such as inorganic arsenic in coal is continuously leached, the leaching rate is 89%, and the flue gas desulfurization rate is 91%.

[0025] Under the same conditions above, when adding ultraviolet light irradiation, the arsenic leaching rate reaches 93%, the pentavalent arsenic in the leaching solution accounts for more than 90% of the total arsenic, and the flue gas desulfurization rate is 94%. When light is irradiated, the arsenic leach...

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Abstract

The invention belongs to the technical field of coal and flue gas purification, and relates to a method for intensifying coal arsenic leaching by using an organic additive, which is characterized by comprising the following specific steps: adding water into pulverized coal with the particle size of 200-450 microns to prepare coal slurry, adding a carboxyl-containing additive into the coal slurry, and then carrying out contact mass transfer reaction with flue gas containing sulfur dioxide, leaching soluble arsenic in the coal into a solution, and oxidizing the sulfur dioxide in the flue gas into sulfate radicals; the pH value of the coal slurry is 1.4-2.8, and the temperature is 35-75 DEG C; and the additive is at least one of oxalic acid, citric acid, tartaric acid and ferric citrate. The inventor finds for the first time that the carboxyl-containing organic additive can promote leaching of coal arsenic, increase the arsenic leaching rate and increase the removal rate of sulfur dioxide; and the method is scientific, simple to operate, high in arsenic removal effect and wide in market application prospect.

Description

Technical field: [0001] The invention belongs to the technical field of coal and flue gas purification, and relates to a method for strengthening coal arsenic leaching with organic additives. Background technique: [0002] my country's energy is dominated by coal. Coal contains harmful trace element arsenic. During coal combustion, most of the arsenic forms highly toxic As 2 o 3 and As 2 o 5 , into the atmosphere with fly ash and particulate matter, polluting the atmosphere. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/11C22B30/04
CPCC22B7/007C22B1/11C22B30/04Y02P10/20
Inventor 孙文寿
Owner 青岛赛诺威尔工业水处理有限公司
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