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Method for recovering lead from lead-containing solid wastes

A solid waste and chloride technology, applied in the field of lead recovery, can solve the problems of complex lead paste, inability to directly apply lead-containing solid waste recycling, difficult recovery and treatment, etc., and achieves high lead recovery rate, low processing cost, and easy operation. Effect

Inactive Publication Date: 2013-09-11
CHANGSHA HUAMING COMPOSITE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, the all-wet method or combined dry-wet method lead recovery technology is mostly used in the recycling of waste lead-acid batteries with high lead content, and the composition of low-grade lead-containing solid waste is more complicated than that of waste lead-acid battery lead paste , and difficult to recycle
None of the above-mentioned existing technologies can be directly applied to the recovery and utilization of low-grade lead-containing solid waste with complex components

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] This embodiment includes the following steps:

[0038] (1) Lead leaching in concentrated salt solution: crush the lead slag of electrolytic manganese anode slime, ball mill it to below 60 mesh, weigh 50g, and leaching in 200ml of sodium chloride-calcium chloride solution, the concentration of sodium chloride in the solution 300g / L, the concentration of calcium chloride is 20g / L, leaching is accompanied by stirring, the leaching temperature is 80°C, and the leaching time is 2 hours; after filtration, lead-containing filtrate is obtained;

[0039] (2) Submerge lead in alkaline solution: add 10wt% NaOH solution (2ml) to the filtrate obtained in step (1) to make the PbCl in the solution 2 It is completely converted into basic lead chloride, the conversion temperature is 80°C, and the conversion time is 32 minutes. The reaction is complete, filtered, washed, and the filtrate and filter residue are obtained. The filter residue is basic lead chloride;

[0040] (3) Conversion of...

Embodiment 2

[0044] This embodiment includes the following steps:

[0045] (1) Lead leaching in concentrated salt solution: crush the lead slag from electrolytic manganese anode slime, ball mill it to below 60 mesh, weigh 50g, and leaching in 300ml of sodium chloride-calcium chloride solution, the concentration of sodium chloride in the solution 300g / L, the concentration of calcium chloride is 40g / L, stirring while leaching, the leaching temperature is 90°C, and the leaching time is 1.5 hours; filter to obtain filtrate and filter residue;

[0046] (2) Submerge lead in alkaline solution: add 10wt% NaOH solution (3.5ml) to the filtrate obtained in step (1) to make the PbCl in the solution 2 It is completely converted into basic lead chloride, the conversion temperature is 90°C, and the conversion time is 30 minutes. The reaction is complete, filtered and washed to obtain filtrate and filter residue, which is basic lead chloride;

[0047] (3) Conversion of basic lead chloride: the basic lead...

Embodiment 3

[0051] This embodiment includes the following steps:

[0052] (1) Lead leaching in concentrated salt solution: crush the lead slag from electrolytic manganese anode slime, ball mill it to below 60 mesh, weigh 50g, and leaching in 300ml of calcium chloride solution with a concentration of 350g / L, the leaching temperature is 70℃ , the leaching time is 1.0 hour; filter to obtain filtrate and filter residue;

[0053] (2) Submerge lead in alkaline solution: add 10wt% NaOH solution (3.5ml) to the filtrate obtained in step (1) to make the PbCl in the solution 2 It is completely converted into basic lead chloride, the conversion temperature is 70°C, and the conversion time is 30 minutes. The reaction is complete, filtered and washed to obtain filtrate and filter residue, which is basic lead chloride;

[0054] (3) Conversion of basic lead chloride: the basic lead chloride obtained in step (2) is added to 10wt% NaOH solution, so that the basic lead chloride in the solution is completel...

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Abstract

A method for recovering lead from lead-containing solid wastes comprises the following steps: 1, fragmenting the lead-containing solid wastes, ball-milling, leaching with an alkali chloride-alkaline earth metal chloride solution or an alkaline earth metal chloride solution as a leaching agent, and filtering; 2, adding an NaOH solution or solid NaOH to a filtrate obtained in step 1 for completely converting PbCl2 in the solution at 20-90DEG C for 30-120min to form basic lead chloride, filtering after the reaction completion, and washing to obtain a filtrate and a filter residue which is basic lead chloride; 3, adding basic lead chloride to the NaOH solution for completely converting basic lead chloride into lead hydroxide, filtering after the reaction completion, washing to obtain a filtrate and a filter residue which is lead hydroxide, and carrying out drying dehydration of lead hydroxide to form lead oxide; and 4, recovering or regenerating the leaching agent. The method has the advantages of simple process, simple operation, low processing cost, high lead recovery rate and no pollution to the environment.

Description

technical field [0001] The invention relates to a method for recovering lead from lead-containing solid waste, in particular to a method for recovering lead from lead-containing solid waste with low lead content produced in the nonferrous metal smelting process. Background technique [0002] Lead is an important non-ferrous metal. With the increasing demand in the world, primary lead in minerals is facing various pressures such as the shortage of industrial mining reserves and serious pollution in mining and smelting processes. In order to solve the serious shortage of primary resources and reduce the cost of raw materials and dressing and smelting, the production of lead is increasingly relying on the secondary resources of lead—regenerated lead. main source. [0003] Lead-containing waste residue is hazardous solid waste. Improper disposal will lead to the disorderly discharge of lead-containing acid liquid and solid waste residue, causing serious pollution of ambient air...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/04C22B3/44C22B13/00
CPCY02P10/20
Inventor 叶华李发增
Owner CHANGSHA HUAMING COMPOSITE MATERIAL TECH
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