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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, reasonable process routes, good market value

Inactive Publication Date: 2008-04-09
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] Referring to Figure 1, first adjust the pH of the zinc leaching solution with a copper ion concentration of 1.2g / L, add zinc oxide powder to it, add and stir, control the pH to 5-6, and let the zinc oxide slightly exceed , Added to the bubbling absorption tower at one time. Displacement of flue gas drawn from a smelter is about 120Nm 3 / h branch, first washed with water to remove dust, and then controlled by the control valve to blow into a bubbling absorption tower, due to air agitation, can avoid suspended solids settling. The present invention performs bubbling reaction under normal pressure and reaction temperature at normal temperature. 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 product is produced. The pH is detected When the value is 2.5-3.5, the liquid in the bubble column is pumped into a constant temperature water tank, kept at a constan...

Embodiment 2

[0023] First adjust the pH value of the zinc leaching solution with a copper ion concentration of 2.0g / L, 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 latter zinc leaching solution containing copper ions is sent to the spray absorption tower. The displacement drawn from the exhaust flue of a smelter is about 1000Nm 3 / h branch, bubbling into a spray absorption tower, the bottom liquid of the absorption tower is pumped out and sent in circulation to repeat absorption. Under the conditions of normal pressure and normal temperature, the absorption reaction is carried out. 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 product is produced at the bottom of the tower. Monitor the pH value At 2.5-3.5 hours, the product is pumped into the thermostatic reaction kettle, and reacted at a con...

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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, and specifically relates to a method for using SO in flue gas 2 Purification of Cu in the supernatant of zinc concentrate smelting electrolyte 2+ The new process of waste water simultaneously produces cuprous oxide. Background technique [0002] Cuprous oxide is a chemical product with a wide range of uses. It can be used to make antifouling paint on ship bottoms, as a fungicide, as a colorant for ceramics and enamel, as a red glass stain, and also for the manufacture of various copper salts, analytical reagents and Used in rectifier plating in the electrical industry. [0003] At present, the main methods for removing the impurity copper ions in zinc electrolyte at home and abroad are zinc powder replacement. In the process of hydro-zinc smelting, the copper ions in the zinc sulfate solution are currently removed by zinc powder due to the copper content. High, the total amount is large, and th...

Claims

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Application Information

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Patent Type & Authority Applications(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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