Technology for extracting lead from lead slag by using whole wet method

A fully wet, lead slag technology, applied in the field of metal metallurgy, can solve the problems of high production cost, large investment, long process, etc., and achieve the effect of reducing production cost, overcoming large investment in equipment, and avoiding pollution and waste.

Inactive Publication Date: 2014-05-14
HUNAN RES INST FOR NONFERROUS METALS +1
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Problems solved by technology

However, this process is characterized by long process, high energy consumption, prominent environmental pollution problems, large investment and high production cost.

Method used

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  • Technology for extracting lead from lead slag by using whole wet method
  • Technology for extracting lead from lead slag by using whole wet method
  • Technology for extracting lead from lead slag by using whole wet method

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the examples and accompanying drawings, and the percentages mentioned in the examples all refer to mass percentages.

[0047] Extract lead from lead slag with the method of the present invention, take the lead slag of a certain factory in Hengyang as example, the lead slag composition (wt%) of this factory is as follows:

[0048]Table 1 Analysis results of main chemical elements of lead slag

[0049]

[0050] The spent alkali is the covering agent after cadmium refining in a cadmium factory, which is formed by water absorption and carbonization, of which Na 2 CO 3 68.99%, Zn 16.26%;

[0051] A process for extracting lead from lead slag by an all-wet method, such as figure 1 As shown, the specific steps are:

[0052] (1) Transformation: mix the lead slag with the above waste alkali and water, control the pH to be greater than 7 and stir the transformation to obtain the mixture; filter the m...

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Abstract

The invention belongs to the field of metal metallurgy and provides a technology for extracting lead from lead slag by using a whole wet method. The technology specifically comprises the following steps of: transforming PbSO4 in the lead slag into PbCO3 by using Na2CO3, leaching PbCO3 material by using NaOH, producing electric lead by lixivium through electro-deposition, washing the electric lead with acid to recycle ZnSO4*H2O, and at the same time, improving the quality of the electric lead; and after the electro-deposition, evaporating and concentrating the lixivium to produce Na2CO3 crystals, causticizing the Na2CO3 crystals through slaked lime to recycle NaOH, and carrying out alkaline leaching on evaporated mother liquor and causticized liquid. The method is strong in adaptability, and is applicable to the lead slag with different components and grades; the production cost is lower than that of a pyrogenic process technology, and the direct yield of lead can be more than 90%.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a process for extracting lead from lead slag by an all-wet method. Background technique [0002] Lead slag is a dangerous solid waste, which can easily pollute the environment if not handled properly. At present, my country mainly adopts the fire method to treat this kind of lead slag. This process technology is mature and the product quality is basically stable. However, this process is characterized by long process, high energy consumption, prominent environmental pollution problems, large investment and high production cost. According to the requirements of the notice of the State Council on the "Twelfth Five-Year Plan" for energy conservation and emission reduction, relevant departments have formulated corporate clean production and comprehensive recycling policies, and under the background of encouraging independent innovation of enterprises, they proposed the process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/12C22B1/00C25C1/18
CPCY02P10/20
Inventor 吴海国刘亮杨文何辉刘景槐谭得友李婕王智友肖超姚金江
Owner HUNAN RES INST FOR NONFERROUS METALS
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