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A method for producing nanometer zinc oxide by using electrolytic zinc acid leaching slag

A nano-zinc oxide and leaching slag technology is applied in the comprehensive utilization of resources and the comprehensive application of new materials, which can solve the problems of shortage of zinc raw materials, high environmental protection treatment pressure and high energy consumption, and achieve the effect of avoiding a large amount of co-precipitation of impurities

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

[0113] 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%.

[0114] 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%.

[0115] The zinc-ammonia complex liquid zinc-ammonia complex liquid obtained by filtering is purified.

[0116] 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.

[0117] Add 18 grams ...

Embodiment 2

[0122] 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%.

[0123] 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%.

[0124] The zinc-ammonia complex liquid zinc-ammonia complex liquid obtained by filtering is purified.

[0125] Add 280 grams of calcium oxide to the purified zinc-ammonia complex solution to precipitate sulfate radicals, react for 1 hour and then filter.

[0126] Add 16 grams of ca...

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Abstract

The invention relates to a method for producing nano zinc oxide by utilizing leaching residues of a zincic acid electrolysis method. The method comprises a primary extraction step, an optional purification step, a desulfurization step, a calcium zincate synthesis step, a primary calcination step, a secondary extraction step, a pressurizing and crystallization step, a decompression and decomposition step, an optional rinsing step and a secondary calcination step. According to the method disclosed by the invention, secondary utilization of the leaching residues is realized when environmental protection problems are solved; resource utilization is realized when various types of heavy metal pollution are solved; sulfate ions which are considered as a pollution source are changed into valuablethings through calcium sulfate transformation; the synthesis of the calcium zincate under a zinc-ammonia environment is realized for the first time; the nano zinc oxide is obtained through the calciumzincate; ammonia steaming is not needed and the method is simple and feasible; the energy consumption of a technology is greatly reduced; high-temperature and high-pressure potential safety hazards and equipment corrosion problems, which are caused by the ammonia steaming, are also avoided; decomposition conditions of ammonium carbonate are creatively utilized in the technology and cyclic utilization of carbon dioxide is realized through pressure difference.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of resources and comprehensive application of new materials, relates to the environmental protection treatment and resource utilization of leaching slag from electrolytic zinc acid method, and particularly relates to a method for producing nanometer zinc oxide by using leaching slag from 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 z...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02C01B32/50
CPCC01B32/50C01G9/02C01P2004/64
Inventor 孙晓明孙际童钟琳灏
Owner CHONGQING DONGQUN TECH CO LTD
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