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Method for producing nano zinc oxide by utilizing leaching residues of zincic acid electrolysis method

A nano-zinc oxide and leaching slag technology, 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 pressure of environmental protection treatment, high energy consumption, etc., and achieve the effect of avoiding a large amount of co-precipitation of impurities

Active Publication Date: 2018-11-23
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 residue of a company in Sichuan has a zinc content of 8.46% and a sulfur content of 14.09%.

[0114] Take 2000 grams of electrolytic zinc acid leaching residue and put it into 10000 ml of ammonia-ammonium bicarbonate mixture (total ammonia mass concentration 10%, carbonate mass concentration 5.5%) for stirring leaching. The leaching temperature is normal temperature and the stirring time is After 2 hours, it is filtered. The filtered liquid contains 1.47% of zinc (based on zinc oxide equivalent) and the mass concentration of sulfate in the liquid is 8.8%. According to the test data, the zinc recovery rate is 86.9%.

[0115] Purify the zinc-ammonia complex solution obtained by filtering the zinc-ammonia complex solution.

[0116] Add 256.7 grams of calcium oxide to the purified zinc-ammonia complex solution to precipitate sulfate radicals, and filter after 1 hour of reaction.

[0117] Add 18 grams of calcium hydroxide for the synthesis of cal...

Embodiment 2

[0122] Electrolytic zinc acid leaching residue from a company in Yunnan has a zinc content of 7.98% and a sulfur content of 16.01%.

[0123] Take 2000 g of electrolytic zinc acid leaching residue and put it into 10000 ml of ammonia-ammonium bicarbonate mixed solution (total ammonia mass concentration 10%, carbonate mass concentration 6%) for stirring leaching. The leaching temperature is normal temperature and the stirring time is After 2 hours, it is filtered. The filtered liquid contains 1.367% of zinc (based on zinc oxide equivalent), and the mass concentration of sulfate in the liquid is 9.61%. According to the test data, the zinc recovery rate was 86.63%.

[0124] Purify the zinc-ammonia complex solution obtained by filtering the zinc-ammonia complex solution.

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

[0126] Add 16 grams of calcium hydroxide for the synthesis...

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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 electrolytic zinc acid leaching residue, and particularly relates to a method for producing nanometer zinc oxide by using electrolytic zinc acid leaching residue. Background technique [0002] 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 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 are problems that need to be solved urgently. At the same time, my country's zinc production and consumption rank first in the worl...

Claims

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Application Information

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Patent Type & Authority Applications(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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