Method for recovering lead, copper and arsenic from white smoke dust

A technology of white smoke, lead and copper, applied in the field of recycling lead, copper and arsenic, can solve the problems of low recycling efficiency, recycling single metal, polluting the environment, etc., and achieve the effect of reducing the amount of discharge and treatment, reducing waste of resources, and reducing environmental pollution

Inactive Publication Date: 2019-06-21
济源市中亿科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0002] During the smelting process of non-ferrous metals, white fumes are often produced. Most of the white fumes are rich in copper, arsenic, lead and other precious metals. If the white fumes are discharged directly, the environment will be seriously polluted. The return of the gas to the smelting system for processing will cause the accumulation of harmful elements such as precious metals in the system, reduce the processing capacity of the smelting furnace, and ...
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Method used

The white soot described in step (1) is the ash collected by the copper smelting electric dust collector, mainly containing lead, copper and arsenic, etc., which is off-white powder, referred to as white soot. The invention recycles the metals in the white smoke dust produced in the smelting process of nonferrous metals, which not only reduces the disch...
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Abstract

The invention discloses a method for recovering lead, copper and arsenic from white smoke dust. The method specifically comprises the following steps that the white smoke dust is brought into ammoniawater for ammonia leaching treatment, pressurizing and filtering are carried out, an obtained solid is washed to obtain lead mud, then high-pressure hydrogen reduction treatment is carried out on a filtrate, an obtained solid is washed and dried to obtain copper powder, then lime is added into the filtrate obtained in the previous step, arsenic precipitation and ammonia water regeneration treatment are carried out, namely the lime is added for reaction, filtering is carried out on an obtained product after the reaction is ended, wherein the filtered filtrate is used as the ammonia water in thesteps in a cyclic mode, a filtered solid is washed and dried to obtain calcium arsenate, finally vacuum carbon reduction treatment is carried out on the calcium arsenate, and reactants are separatedto obtain calcium oxide and the metal arsenic. According to the method, metal in white smoke dust generated in the nonferrous metal smelting process is recovered, so that the environmental pollution is reduced, and recovery of the valuable metal and cyclic utilization of resources are realized.

Application Domain

Process efficiency improvementCalcium/strontium/barium oxides/hydroxides

Technology Topic

High pressure hydrogenSal ammoniac +12

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  • Method for recovering lead, copper and arsenic from white smoke dust
  • Method for recovering lead, copper and arsenic from white smoke dust

Examples

  • Experimental program(1)

Example Embodiment

[0012] Embodiment: The present invention provides a kind of method of reclaiming lead, copper and arsenic from white smoke, and the concrete steps are as follows:
[0013] (1) pass the white smoke dust into ammonia water for ammonia leaching treatment, after the reaction is finished, the resultant is subjected to pressure filtration, and the obtained solid is washed to be lead mud;
[0014] (2) passing hydrogen into the filtrate obtained in step (1) and pressurizing it, performing high-pressure hydrogen reduction treatment, filtering the product after the reaction, washing and drying the obtained solid to obtain copper powder;
[0015] (3) Add lime to the filtrate obtained in step (2), carry out arsenic precipitation and regenerate ammonia water treatment, that is, add lime to react, and filter the obtained product after the reaction is completed, wherein the filtered filtrate is used as step (1) The ammonia water in the process is recycled, and the filtered solid is washed and dried to obtain calcium arsenate;
[0016] (4) carrying out vacuum carbon reduction treatment on the calcium arsenate obtained in step (3), and separating the reactants to obtain calcium oxide and metal arsenic, wherein calcium oxide is recycled as lime in step (3).
[0017] The white soot in step (1) is the ash collected by the copper smelting electric precipitator, mainly containing lead, copper and arsenic, etc., and is a gray-white powder, referred to as white soot. The invention recovers the metals in the white smoke generated in the non-ferrous metal smelting process, not only reduces the discharge and treatment amount of waste water and waste gas, reduces environmental pollution, but also realizes the recovery of valuable metals and reduces the waste of resources. The reactants produced in the process, such as ammonia water, calcium oxide, etc., are recycled, which improves the utilization efficiency of white smoke and reduces the production cost.

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Description & Claims & Application Information

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