Method of recycling valuable metals from arsenic-containing soot

A technology for valuable metals and soot, which is applied in the field of recovery of valuable metals from arsenic-containing soot, can solve the problems of land occupation, environmental pollution, etc., and achieve the effects of short process flow, small footprint and simple operation

Active Publication Date: 2015-02-18
五矿铜业(湖南)有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used treatment methods are to first neutralize the dirty acid to neutral, and then use the vulcanization method and lime method to precipitate; the above-mentioned neutralization and precipitation method can achieve the purpose of treating dirty acid, but it will generate piles of gypsum slag, which takes up a lot of land resources, causing serious pollution to the environment

Method used

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  • Method of recycling valuable metals from arsenic-containing soot
  • Method of recycling valuable metals from arsenic-containing soot
  • Method of recycling valuable metals from arsenic-containing soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The dirty acid used in this example is lead smelting dirty acid, and the specific components are shown in Table 1; the white soot is copper smelting soot, and the specific components are shown in Table 2.

[0015] (1) The dirty acid and white soot are mixed according to the liquid-solid ratio of 5:1, the pH value is controlled at 2.5-3.0, and 500ml is taken for acid leaching at a temperature of 70°C for 2 hours. Filter to obtain leachate and lead slag. After testing, the leaching solution was 380ml, the lead slag was 78.8g, the leaching rate of As was 95.4%, the leaching rate of Zn was 83.1%, and the leaching rate of Pb was only 2.34%. The specific leaching data are shown in Table 3;

[0016] (2) the leaching solution is replaced with zinc powder for indium, and filtered to obtain indium slag;

[0017] (3) The filtrate was de-arsenized and de-zincified by cyclone electrowinning, and arsenic slag and zinc slag were recovered. The de-arsenic rate was 99.2%, and the de-zi...

Embodiment 2

[0029] The dirty acid used in this example is zinc smelting dirty acid, and the specific components are shown in Table 5; the white soot is copper smelting soot, and the specific components are shown in Table 6.

[0030] (1) The dirty acid and white soot are mixed according to the liquid-solid ratio of 5:1, the pH value is controlled at 2.5-3.0, and 500ml is taken for acid leaching at a temperature of 80°C for 2 hours. Filter to obtain leachate and lead slag. After testing, the leaching rate of As was 95.7%, the leaching rate of Zn was 82.8%, and the leaching rate of Pb was only 2.37%. The specific leaching data are shown in Table 7;

[0031] (2) the leaching solution is replaced with zinc powder for indium, and filtered to obtain indium slag;

[0032] (3) The filtrate was de-arsenized and de-zincified by cyclone electrowinning, and arsenic slag and zinc slag were recovered. The de-arsenic rate was 99.1%, and the de-zinc rate was 58.9%. The specific data are shown in Table 8....

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Abstract

The invention relates to a method of recycling valuable metals from arsenic-containing soot. The method comprises the following steps: (1) mixing acidic wastewater with white soot, controlling the pH value to 2.5-3.0, performing acid leaching at a temperature of 70-80 DEG C, and filtering to obtain leachate and lead slag; (2) replacing indium for the leachate by using zinc powder, and filtering to obtain indium slag; (3) performing rotational-flow electrodeposition arsenic removal and zinc removal on filtrate in sequence to obtain arsenic slag and zinc slag. The method disclosed by the invention can be used for purifying the acidic wastewater to reach a condition for recycling the acidic wastewater to a smelting acid manufacturing and purifying section, so that the treated acidic wastewater can be directly returned to the acid manufacturing and purifying section, and therefore, the gypsum slag is completely removed to truly achieve the purpose of zero emission. Meanwhile, the method disclosed by the invention can also be used for achieving the treatment of white soot and recycling the valuable metals, so that environmental protection and resource comprehensive utilization are achieved.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a method for recovering valuable metals from arsenic-containing soot. Background technique [0002] White soot is the soot obtained from flue gas dust collection in the metal smelting process. It is one of the most representative alkaline wastes in the industry at present. It not only contains heavy metal valuable elements such as Pb, Bi, Zn, but also contains harmful elements such as As. If this waste is not disposed of in time, it will not only cause serious environmental pollution, but also cause a waste of resources. The commonly used treatment method is to directly return the soot to the smelting system for treatment; the above method not only reduces the processing capacity of the flash furnace and deteriorates the furnace condition, but also increases the harmful components such as As in the charge. [0003] Sludge acid is the waste acid produced by wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B13/00C22B58/00C22B30/04C22B19/30
CPCY02P10/20
Inventor 周中元李绪忠虢振强于熙广胡长松王水云高伟卢丽赵凌波陈林吴班陈寒秋邓涛门海芬张弘强贺迎春夏传
Owner 五矿铜业(湖南)有限公司
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