A kind of method utilizing electrolytic zinc acid leaching residue to produce zinc oxide

A technology of leaching residue and zinc acid method, which is applied in the comprehensive utilization of resources and the comprehensive application of new materials, can solve the problems of shortage of zinc raw materials, high energy consumption, high pressure on environmental protection treatment, etc. high effect

Active Publication Date: 2020-02-21
CHONGQING DONGQUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical solution proposed in this disclosure solves the current shortage of zinc raw materials. It is a good method of preparing zinc oxide through calcium zincate. multifaceted problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] The electrolytic zinc acid leaching slag from a company in Sichuan has a zinc content of 8.46% and a sulfur content of 14.09%.

[0113] Get 2000 grams of electrolytic zinc acid method leaching slag, put into 10000 milliliters of ammonia-ammonium bicarbonate mixed solution (10% of total ammonia mass concentration, 5.5% of carbonate root mass concentration) and carry out stirring and leaching, leaching temperature is normal temperature, stirring time is After 2 hours, it was filtered, and the filtered liquid contained 1.47% zinc (in terms of zinc oxide equivalent), and the sulfate radical mass concentration in the liquid was 8.8%. According to the test data, the recovery rate of zinc is 86.9%.

[0114] The zinc-ammonia complex liquid zinc-ammonia complex liquid obtained by filtering is purified.

[0115] Add 256.7 grams of calcium oxide to the purified zinc-ammonia complex solution to precipitate sulfate radicals, react for 1 hour and then filter.

[0116] Add 18 grams ...

Embodiment 2

[0121] The electrolytic zinc acid leaching slag from a company in Yunnan has a zinc content of 7.98% and a sulfur content of 16.01%.

[0122]Get 2000 grams of electrolytic zinc acid leaching slag, put into 10000 milliliters of ammonia-ammonium bicarbonate mixed solution (10% of total ammonia mass concentration, 6% of carbonate root mass concentration) and carry out stirring and leaching, leaching temperature is normal temperature, stirring time is After 2 hours, it was filtered, and the filtered liquid contained 1.367% zinc (in terms of zinc oxide equivalent), and the sulfate radical mass concentration in the liquid was 9.61%. According to the inspection data, the recovery rate of zinc is 86.63%.

[0123] The zinc-ammonia complex liquid zinc-ammonia complex liquid obtained by filtering is purified.

[0124] Add 280 grams of calcium oxide to the purified zinc-ammonia complex solution to precipitate sulfate radicals, react for 1 hour and then filter.

[0125] Add 16 grams of c...

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PUM

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Abstract

The invention relates to a method for producing zinc oxide through electrolytic zinc acid process leaching residues. The method comprises a primary digestion step, an optional purifying step, a desulfuration step, a calcium zincate synthesizing step, a primary calcining step, a secondary digestion step, a pressurizing and crystallizing step, a pressure reducing and decomposing step, an optional rinsing step and a secondary calcining step. According to the method, the problem about environmental protection is solved, secondary utilization of the leaching residues is achieved, pollution of multiple heavy metals is avoided, and meanwhile resource utilization of the leaching residues is achieved. Ammonia distillation is not needed, the method is simple, convenient and practical, and the energyconsumption of the process is greatly reduced. Sulfate ions as a pollution source are converted into wealth from waste through calcium sulfate, calcium zincate synthesis is achieved in a zinc ammoniaenvironment for the first time, zinc oxide is obtained from calcium zincate, the decomposing condition of ammonium carbonate is creatively utilized in the process, and recycling of carbon dioxide isachieved through differential pressure.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of resources and comprehensive application of new materials, relates to environmental protection treatment and resource utilization of leaching slag of electrolytic zinc acid method, and particularly relates to a method for producing zinc oxide by using leaching slag of electrolytic zinc acid method. Background technique [0002] The electrolytic zinc acid leaching slag is the most important pollutant in the electrolytic zinc industry. It belongs to the leaching slag produced by the conventional leaching method in the lead-zinc smelting process and the sulfur slag (leaching slag) produced by atmospheric oxygen leaching and pressurized oxygen leaching in the national hazardous waste catalog. ). The treatment and resource utilization of electrolytic zinc acid leaching residue is an urgent problem to be solved. At the same time, the production and consumption of zinc in my country ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B3/14C22B3/44C22B19/34
CPCC22B3/14C22B3/44C22B7/008C22B7/04C22B19/34Y02P10/20
Inventor 孙晓明孙际童钟琳灏
Owner CHONGQING DONGQUN TECH CO LTD
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