Method for synergistically converting and decomposing calcium-arsenic precipitate through ultrasonic waves

A sediment and ultrasonic technology, applied in the fields of metallurgy and environmental protection, can solve the problems of unstable chemical properties, harsh conditions, and high energy consumption costs

Active Publication Date: 2021-05-18
YUNNAN CHIHONG ZINC & GERMANIUM +1
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  • Claims
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Problems solved by technology

[0004] From the previous patents and the research status at home and abroad, it can be seen that most arsenic fixation technologies adopt lime precipitation method (atmospheric pressure method, hydrothermal method), and other methods include scorodite method and vitrification method; these technologies are all There are certain defects: (1) The lime precipitation method is a commonly used treatment method for arsenic sulfide slag and arsenic-containing wastewater. This method uses lime to precipitate arsenic in the solution, and then produces arsenic-containing intermediate products-calcium arsenate or arsenous acid Calcium; the main component of calcium arsenate is a mixture of calcium hydroxide and calcium arsenate. The calcium salt of arsenic has a high solubility and is not stable in chemical properties. Pay high environmental protection tax per ton; therefore, due to environmental protection and economic considerations, it is imminent to realize the economical, environmental protection, safe and harmless disposal of calcium arsenate slag
(2) The scorodite method is to oxidize the arsenic precipitate in the iron-containing solution through normal pressure or pressurized hydrothermal reac

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  • Method for synergistically converting and decomposing calcium-arsenic precipitate through ultrasonic waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The raw material used in this embodiment is the calcium arsenate slag obtained by adding 1.2 times the theoretical amount of lime to the lead anode slime oxygen pressure alkaline immersion solution, and the calcium arsenate slag contains 29.98% of arsenic.

[0035] Add 100.00g of calcium arsenate slag to 1000mL of water, stir mechanically until a slurry is formed, and at a leaching temperature of 80°C, introduce carbon dioxide gas into a cavitation generating device, the molar ratio of carbon dioxide and calcium in calcium arsenate The ratio is 5:1, the carbon dioxide feed time is 360 minutes, and the cavitation effect time is 360 minutes. After the reaction is completed, the mixed slurry is subjected to liquid-solid separation to obtain calcium carbonate and arsenic-containing solution. The arsenic content in the calcium carbonate is 0.01%. After the arsenic solution is evaporated and crystallized, the carbothermal reduction is carried out at a temperature of 800°C, a t...

Embodiment 2

[0037] The raw material used in this example is a mixture containing calcium arsenite obtained by adding 1.5 times the theoretical amount of lime to arsenic-containing wastewater, and the mixture contains 14.56% arsenic.

[0038] Add 100.00g of the mixture containing calcium arsenite to 600mL of water, stir mechanically until a slurry is formed, and at a leaching temperature of 80°C, pass in carbon dioxide gas and introduce a cavitation generating device, carbon dioxide, calcium arsenate and arsenous The molar ratio of calcium element in the calcium carbonate is 5: 1, and the carbon dioxide feed time is 360min, and the cavitation effect time is 360min, and after the reaction is finished, the mixed slurry is subjected to liquid-solid separation to obtain calcium carbonate and arsenic-containing solution; The arsenic content in calcium carbonate is 0.04%. After the arsenic-containing solution is evaporated and crystallized, the carbothermal reduction is carried out at a temperatu...

Embodiment 3

[0040] The raw material used in this embodiment is a mixture containing calcium arsenite obtained by adding 1.2 times the theoretical amount of lime to the lead anode slime normal-pressure alkaline immersion solution, and the mixture contains 21.75% arsenic.

[0041] Add 100.00g of calcium arsenate slag to 800mL of water, stir mechanically until a slurry is formed, and at a leaching temperature of 80°C, pass in carbon dioxide gas and introduce a cavitation generating device, carbon dioxide and calcium arsenate and calcium arsenite The molar ratio of elements is 5: 1, the carbon dioxide feed time is 360min, and the cavitation effect time is 360min. After the reaction is finished, the mixed slurry is subjected to liquid-solid separation to obtain calcium carbonate and arsenic-containing solution; The arsenic content is 0.03%; after the arsenic-containing solution is evaporated and crystallized, the carbothermal reduction is carried out at a temperature of 1200°C, a time of 120 mi...

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Abstract

The invention relates to a method for synergistically converting and decomposing a calcium-arsenic precipitate through ultrasonic waves. The method for synergistically converting and decomposing the calcium-arsenic precipitate through the ultrasonic waves comprises the following steps that (1), the calcium-arsenic precipitate and water are mixed according to a liquid-solid ratio of (2 to 10) to 1 for size mixing, carbon dioxide gas is introduced at a leaching temperature of 25-90 DEG C, a cavitation generation device is introduced, the calcium-arsenic precipitate is reacted with an aqueous solution of carbon dioxide, and mixed slurry is obtained; (2), liquid-solid separation is carried out on the mixed slurry to obtain calcium carbonate and an arsenic-containing solution; and (3), evaporative crystallization-carbon thermal reduction is carried out on the arsenic-containing solution to obtain metal arsenic. According to the method for synergistically converting and decomposing the calcium-arsenic precipitate through the ultrasonic waves, the calcium-arsenic precipitate (calcium arsenate, calcium arsenite or a mixture of the calcium arsenate and the calcium arsenite) can be quickly converted and decomposed, so that calcium carbonate with low arsenic content is obtained from the calcium-arsenic precipitate under the action of an ultrasonic cavitation effect, the conversion rate of the calcium-arsenic precipitate is effectively improved, the content of arsenic in the calcium carbonate is further reduced, and finally, the purposes of reducing the hazardous waste disposal cost of the arsenic of enterprises and performing harmless disposal are achieved.

Description

technical field [0001] The invention belongs to the technical fields of metallurgy and environmental protection, and in particular relates to a method for ultrasonic synergistic conversion and decomposition of calcium-arsenic precipitates. Background technique [0002] Arsenic is a toxic element that mainly exists in the form of sulfide and is associated with minerals formed by other metals such as lead, zinc, copper, etc. It will produce a large amount of sulfide in the process of non-ferrous metal smelting and sulfuric acid industrial flue gas acid production process Arsenic slag and high (low) arsenic wastewater. The arsenic in these arsenic sulfide residues and arsenic-containing wastewater must be removed with stable compounds. Therefore, the removal and harmless disposal of arsenic in the field of non-ferrous metal smelting has always been a research hotspot. [0003] The current patents on the disposal of arsenic-containing waste liquid and the decomposition method o...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B5/10C22B26/20C22B30/04C01F11/18
CPCC22B7/006C22B7/001C22B5/10C22B30/04C22B26/20C01F11/18Y02P10/20
Inventor 杨大锦付维琴贾著红刘俊场马雁鸿邹维李衍林谢天鉴张候文牟兴兵代龙果翟忠标
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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