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Method for recovering copper and arsenic from copper smelting white smoke dust leaching solution and arsenic filter cake

A technology of white smoke and leachate, applied in the field of comprehensive utilization of resources, can solve the problems of low copper deposition rate and high production cost, achieve high recovery rate, save time and energy consumption, and shorten the production process

Active Publication Date: 2020-04-10
黑龙江紫金铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the outlet problem of the arsenic filter cake in the copper smelting process, in the early 1990s, Jiangtong Guixi Smelter introduced Toyo technology from Japan, and used copper powder as raw material to replace the arsenic filter cake after oxidative leaching to produce arsenic trioxide. Products and copper sulfide, arsenic trioxide are sold outside, and copper sulfide is returned to the system for smelting, which realizes the resource utilization of arsenic filter cake, but this process has the disadvantage of high production cost. The production of 1 ton of arsenic trioxide requires 3.5 to 4.0 tons of copper powder. Now Change to high pressure oxidation leaching process
[0005] Chinese invention patent application "A comprehensive recovery method for copper smelting arsenic sulfide slag and smoke leaching solution arsenic" (application publication number: CN108249480A) discloses a method of treating arsenic filter cake with white smoke and dust leaching solution to comprehensively recover arsenic, copper, zinc and other elements The process, the main process of which is "copper sulfide precipitation - liquid reduction after sulfide - concentration, mixed crystallization - crystallization dissolution, refining". The advantage of this method is to realize the resource utilization of arsenic filter cake and white smoke dust. The disadvantage is that The copper precipitation reaction is carried out under the conditions of normal pressure, 50-80°C, and 3-8 hours. The copper precipitation rate is relatively low, resulting in the co-crystallization of arsenic trioxide and copper sulfate during the concentration process.

Method used

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  • Method for recovering copper and arsenic from copper smelting white smoke dust leaching solution and arsenic filter cake
  • Method for recovering copper and arsenic from copper smelting white smoke dust leaching solution and arsenic filter cake
  • Method for recovering copper and arsenic from copper smelting white smoke dust leaching solution and arsenic filter cake

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Experimental program
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Effect test

Embodiment 1

[0047] 1. Pressurized sinking copper

[0048] Under the conditions of reaction temperature 102°C, reaction time 2h, nitrogen (or inert gas) pressure 0.3MPa, acidity of white soot leaching solution 30g / l, arsenic filter cake amount 0.7 times the theoretical amount, the copper precipitation reaction was carried out, and the reaction was carried out in 2L Carried out in an autoclave, the composition of the arsenic filter cake and white smoke leach solution before the reaction is shown in the following table:

[0049]

[0050] 2. Cooling and filtering

[0051] After the reaction is completed, filter after pressure relief and cooling to obtain copper-precipitated liquid and copper sulfide. The relevant components are shown in the following table:

[0052]

[0053] 3. Cooling crystallization

[0054] The concentration of As in the liquid after copper precipitation is low, and it has not yet reached saturation, so it cannot crystallize during the cooling process, and returns ...

Embodiment 2

[0056] 1. Pressure sinking copper

[0057] Under the conditions of reaction temperature 115°C, reaction time 2h, nitrogen (or inert gas) pressure 0.3MPa, acidity of white soot leaching solution 80g / l, arsenic filter cake amount 1.05 times the theoretical amount, the copper precipitation reaction was carried out, and the reaction was carried out in 2L Carried out in an autoclave, the composition of the arsenic filter cake and white smoke leach solution before the reaction is shown in the following table:

[0058]

[0059] 2. Cooling filter

[0060] After the reaction is completed, after pressure relief and cooling, filter to obtain the copper-precipitated liquid and copper sulfide. The relevant components are shown in the following table:

[0061]

[0062] 3. Cooling and crystallization

[0063] The filtered copper-precipitated liquid continues to be stirred and cooled to room temperature to obtain crude crystals of diarsenic trioxide and crystallization mother liquor, cr...

Embodiment 3

[0071] 1. Pressurized sinking copper

[0072] Under the conditions of reaction temperature 125°C, reaction time 2h, nitrogen (or inert gas) pressure 0.3MPa, acidity of white soot leaching solution 100g / l, arsenic filter cake amount 0.7 times the theoretical amount, the copper precipitation reaction was carried out, and the reaction was carried out in 2L Carried out in an autoclave, the composition of the arsenic filter cake and white smoke leach solution before the reaction is shown in the following table:

[0073]

[0074] 2. Cooling and filtering

[0075]

[0076] 3. Cooling crystallization

[0077] The filtered copper-precipitated liquid continues to be stirred and cooled to room temperature to obtain crude crystals of diarsenic trioxide and crystallization mother liquor, crystallization mother liquor

[0078] Return to the leaching of white smoke, the composition of the mother liquor is shown in the following table:

[0079] name As Zn Cu h 2 SO...

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Abstract

The invention relates to a method for recovering copper and arsenic from a copper smelting white smoke dust leaching solution and an arsenic filter cake, and belongs to the technical field of comprehensive utilization of resources. The method comprises the following steps: a, pressurization copper deposition; b, cooling and filtering; c, cooling and crystallizing; and d, arsenic trioxide refining.The method has the following advantages that the resource utilization of the arsenic filter cake is realized, the recovery rate of copper and arsenic is high, the whole process is closed-loop circulation, and secondary pollution is avoided; meanwhile, sulfur dioxide does not need to be used for reduction, the production cost is saved, the production process is shortened, the time and the energy consumption are saved, and therefore the method has the outstanding advantages of economy, environmental protection, high efficiency, energy saving and the like.

Description

technical field [0001] The invention relates to a method for recovering copper and arsenic from copper smelting white smoke leach solution and arsenic filter cake, and belongs to the technical field of comprehensive utilization of resources. Background technique [0002] White soot is the soot collected from the electric dust collection process in the copper smelting process, which contains elements such as copper, lead, zinc, arsenic, bismuth, antimony, gold and silver. The cyclic accumulation of harmful impurities such as bismuth will deteriorate the furnace condition and even affect the quality of electrolytic copper products. The white smoke must be opened from the system and recycled separately. [0003] The arsenic filter cake is the arsenic sulfide slag obtained by sulfidizing and dearsenicizing the waste acid opened in the flue gas washing and purification process in the copper smelting process, and its main component is arsenic sulfide. There are two main types of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B15/00C22B30/04C22B19/20
CPCC22B7/006C22B7/02C22B15/0089C22B19/26C22B30/04Y02P10/20
Inventor 林泓富吴健辉周安梁李田玉罗伟金李光明林青刘忠梅
Owner 黑龙江紫金铜业有限公司
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