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Treatment method for separating copper and arsenic in arsenic filter cakes

A treatment method and arsenic separation technology, applied in the direction of improving process efficiency, can solve the problems of high cost, complex equipment and operating conditions, alkali consumption, etc., and achieve convenient operation, high separation rate of copper and arsenic, and simple production equipment. Effect

Active Publication Date: 2015-12-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high pressure operation used in the production process, the equipment and operating conditions are relatively complicated, so the cost is relatively high
The alkali leaching method is a wet arsenic removal method based on NaOH. The source of raw materials is convenient, the operation method is simple, and there is no need to change the original smelting process. However, the disadvantage of this method is that when the arsenic concentration is high, the consumption of alkali, The cost is high, and there is currently no simple and low-cost alkali recovery method

Method used

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  • Treatment method for separating copper and arsenic in arsenic filter cakes
  • Treatment method for separating copper and arsenic in arsenic filter cakes

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Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1: the copper arsenic separation treatment method of a kind of arsenic filter cake of the present invention, concrete operation is as follows:

[0038] The raw material used in embodiment 1 comes from a certain copper smelter. First, the raw material arsenic filter cake (the composition of the main element mass percentage included is: S42.10%, As18.20%, Cu17.10%, Bi0.82%, Pb0.41%, the main phase mass percentage components are: arsenic sulfide 1.2%, arsenate 0.75%, arsenic oxide 15.04%, soluble copper 7.23%, copper sulfide 8.94%) drying, grinding, After sieving, take 50g, add 500ml of water in proportion, mix well and then add CuCl according to Cu:As=5:8 2 Medicine 3g. The water bath heating controls the temperature at 80±5°C, while feeding air at 40L / min and stirring at a speed of 300r / min. After the reaction was carried out for 3 h, Na was added 2S solid 1.6g, continue heating and stirring for 3h. At the beginning of the leaching process, the solution wa...

Embodiment 2

[0041] Embodiment 2: the copper arsenic separation treatment method of a kind of arsenic filter cake of the present invention, specific operation is as follows:

[0042] The raw material used in embodiment 2 comes from a certain copper smelter. First, the raw material arsenic filter cake (the composition of the main element mass percentage included is: S31.2%, As13.5%, Cu17.60%, Bi0.72%, Pb0.23%, the main phase mass percentage components are: arsenic sulfide 0.95%, arsenate 0.55%, arsenic oxide 10.84%, soluble copper 8.51%, copper sulfide 9.57%) drying, grinding, Take 50g after sieving, add 600ml of water in proportion, mix well and then add CuCl according to Cu:As=5:8 2 Medicament 2.25g. The water bath heating controls the temperature at 80±5°C, while feeding air at 20L / min and stirring at a speed of 300r / min. After the reaction was carried out for 2 h, Na was added 2 S solid 0.88g, continue heating and stirring for 3h. At the beginning of the leaching process, the soluti...

Embodiment 3

[0045] Embodiment 3: the copper arsenic separation treatment method of a kind of arsenic filter cake of the present invention, specific operation is as follows:

[0046] The raw material used in embodiment 3 comes from a copper smelter, first the raw material arsenic filter cake (the composition of the main element mass percentage included is: S42.10%, As18.20%, Cu17.10%, Bi0.82%, Pb0.41%, the main phase mass percentage components are: arsenic sulfide 1.2%, arsenate 0.75%, arsenic oxide 15.04%, soluble copper 7.23%, copper sulfide 8.94%) drying, grinding, After sieving, take 50g, add 500ml of water in proportion, mix well and then add CuSO according to Cu:As=7:8 4 Medicament 4.2g. The water bath heating controls the temperature at 85±5°C and stirs at a speed of 200r / min. After the reaction was carried out for 1 h, Na was added 2 S solid 1.7g, continue heating and stirring for 5h. At the beginning of the leaching process, the solution was blue, and as the leaching process p...

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Abstract

The invention discloses a treatment method for separating copper and arsenic in arsenic filter cakes. The method comprises the following steps: (1) drying, grinding and sieving raw residues of the arsenic filter cakes; (2) mixing the sieved residues with water and pulping; (3) adding copper chloride into a solution; (4) placing the solution in a water bath stirrer at 80-85 DEG C and simultaneously introducing air and reacting for 6 hours; and (5) reacting for 1-3 hours, then adding sodium sulfide into the solution, introducing the generated sodium sulfide into leaching residues, wherein a leaching solution is an arsenic-containing solution. According to the treatment method for separating copper and arsenic of the arsenic filter cakes, the purpose of separating copper and arsenic can be effectively achieved; the leaching residue is returned to the smelting process and is used; then the leaching solution is oxidized; the pH is regulated; ferrous sulfate is used for depositing arsenic to generate scorodite crystals. The method effectively reaches high recovery rate of copper and harmless treatment of arsenic in the arsenic filter cakes with low cost.

Description

technical field [0001] The invention belongs to the treatment of arsenic-containing solid waste, and in particular relates to a treatment method for separating copper and arsenic in an arsenic filter cake. Background technique [0002] Non-ferrous smelting is one of the most important sources of arsenic pollution, and the global industry emits nearly 100,000 tons of arsenic every year. About 90% of the arsenic comes from copper, lead, zinc and other non-ferrous metal smelting industries, and the arsenic filter cake produced in the copper smelting process is also an important source of arsenic pollution. The arsenic filter cake is a substance obtained by washing the flue gas produced in the flash copper smelting with sulfuric acid, and the arsenic and other heavy metals in it enter the dirty acid solution and undergo sulfuration treatment. The slag is strongly acidic, contains high arsenic and copper content, and low content of other non-ferrous metals. Some domestic smelter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B30/04C22B15/00
CPCY02P10/20
Inventor 闵小波柴立元沈忱李辕成史美清费讲驰李青竹杨志辉唐崇俭杨卫春彭兵
Owner CENT SOUTH UNIV
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