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Process for purifying Cu2+ impurity in zinc electrolytic solution by employing SO2 in smoke gas with by-product of cuprous oxide

A technology for cuprous oxide and zinc purification, applied in copper oxide/copper hydroxide, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problem of high treatment costs, achieve significant environmental benefits, considerable economic benefits, good market value

Inactive Publication Date: 2010-11-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome Cu in the existing zinc electrolyte 2+ To deal with the problem of high cost, provide a new process to achieve "use waste to treat waste" and save costs, and at the same time prepare a new process for cuprous oxide

Method used

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  • Process for purifying Cu2+ impurity in zinc electrolytic solution by employing SO2 in smoke gas with by-product of cuprous oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Refer to attached figure 1 , first adjust the pH value of the zinc leaching solution containing copper ions with a concentration of 1.2g / L, then add zinc oxide powder into it, add and stir while controlling the pH value to 5-6, let the zinc oxide be slightly excessive, and add it all at once into the bubbling absorption tower. The emission from the flue gas of a smelter is about 120Nm 3 / h branch, first wash with water to remove dust, and then controlled by the control valve to blow into a bubbling absorption tower, due to the air stirring, the suspended matter can be avoided from settling. In the present invention, the bubbling reaction is carried out under normal pressure and the reaction temperature is normal temperature, and the residual flue gas after the absorption reaction is directly discharged through the top of the bubbling absorption tower. After the reaction, a large amount of dark red products are produced, and the pH is detected When the value is 2.5-3.5...

Embodiment 2

[0023] First adjust the pH value of the copper ion concentration to 2.0g / L zinc leaching solution, add zinc oxide powder to it, add and stir, control the pH value to 5-6, let the zinc oxide be slightly excessive; adjust the pH value The final zinc leaching solution containing copper ions is sent to the spray absorption tower. The discharge volume extracted from the flue of acid production tail gas in a smelter is about 1000Nm 3 The / h branch is blown into a spray absorption tower, and the liquid at the bottom of the absorption tower is pumped out and circulated for repeated absorption. Under the conditions of normal pressure and reaction temperature, the absorption reaction is carried out, and the residual flue gas after the absorption reaction is directly discharged through the top of the spray tower. After the reaction, a large amount of dark red products are produced at the bottom of the tower. The pH value is monitored at From 2.5 to 3.5, pump the product into a constant ...

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Abstract

The invention discloses a process for purifying Cu<2+> impurity in zinc electrolytic solution with SO2 in flue gas and simultaneously producing cuprous oxide as a byproduct. The invention is characterized in that the process comprises adding zinc oxide into zinc leaching solution containing Cu<2+> to adjust the pH to 5-6; allowing flue gas containing SO2 and the zinc leaching solution containing Cu<2+> to react in a desulphurizing tower to get precipitants including SO4<2-> and Cu2O; stopping the reaction when the pH of the mixed reaction solution is assayed to be 2.5-3.5; after heating and heat preserving, filtering the mixed solution after reaction to obtain cupric-removed purified liquid and cuprous oxide filter cakes. The invention overcomes the shortcoming of low cost of the prior method for processing Cu<2+> contained in the zinc electrolytic solution and provides a new process which treats the waste with another waste, and can save energy and simultaneously produce cuprous oxide.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a method for utilizing SO in flue gas 2 Purification of Cu Containing Cu in Electrolyte Supernatant of Zinc Concentrate Smelting 2+ A new process for waste water, while producing cuprous oxide. Background technique [0002] Cuprous oxide is a chemical product with a wide range of uses. It can be used to make ship bottom antifouling paint, as a fungicide, as a coloring agent for ceramics and enamel, as a red glass staining agent, as well as for making various copper salts, analytical reagents and Rectifier plating in the electrical industry. [0003] At present, the domestic and foreign methods for removing impurity copper ions in zinc electrolyte mainly use zinc powder replacement. During the zinc hydrometallurgy process, copper ions in zinc sulfate solution are currently reduced and removed by zinc powder. High, the total amount is large, and the price of zinc powder i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/66B01D53/50C01G3/02
Inventor 李立清叶华唐明成
Owner CENT SOUTH UNIV
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