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Zinc calcine short-process zinc hydrometallurgy method

A technology of hydrometallurgy and zinc calcination, which is applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of harsh condition control, long time, and heavy workload in the iron sinking process, and achieve simplification of the leaching process, The effect of improving production efficiency and shortening the process flow

Active Publication Date: 2020-12-25
JIANGSU UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

Strict control of iron sinking process conditions, long time and heavy workload have become a bottleneck restricting the development of hydrometallurgy process to some extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Zinc calcined sand in a zinc factory mainly contains (wt%): Zn 57.45, Fe 9.63, Si 1.45, Pb 1.60, Cu 1.07, Mn 0.76, Ca 0.62, Al 0.42, Cd 0.25, Mg 0.16 and S 1.90.

[0023] Reagents (component content, wt%): food grade aminoacetic acid, content ≥99%; industrial grade iminodiacetic acid, content ≥98%; analytical pure sodium hydroxide, content ≥99%.

[0024] (1) At 70°C, use sodium hydroxide to adjust the pH value of the mixed aqueous solution of aminoacetic acid and iminodiacetic acid to 8.0, and prepare the total concentration of aminoacetate ions to be 3.5mol / L, and the total concentration of iminodiacetic acid ions to be Add 150mL of 0.2mol / L mixed system aqueous solution into a 200mL autoclave.

[0025] (2) In the autoclave, add 15g of zinc calcined sand according to the liquid-solid ratio of 10:1, tighten the autoclave and raise the temperature to 140°C, and stop the heating reaction after 4 hours of reaction. After the temperature in the kettle drops below 60°C, sol...

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PUM

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Abstract

The invention belongs to the field of zinc calcine wet processing, and particularly relates to a zinc calcine short-process zinc hydrometallurgy method. The zinc calcine short-process zinc hydrometallurgy method comprises the steps that in a closed container, a mixed system of aminoacetate and iminodiacetate is adopted for high-temperature reinforced dissolution of zinc calcine, in the leaching process, valuable metal lead, cadmium, copper, nickel and cobalt are dissolved together with main metal zinc and enter leaching liquid, and impurities of iron, silicon, calcium and magnesium are not dissolved out and are left in leaching residues. The leaching liquid is subjected to electrodeposition zinc extraction after being reduced and purified by zinc powder. Zinc is directly and selectively leached in one step, so that zinc-iron separation is realized, the complicated two-stage leaching and iron precipitation process of an existing process is avoided, the leaching process is simplified, the wet zinc extraction process flow of the zinc calcine is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of zinc calcine wet treatment, in particular to a method for preparing electric zinc by short-flow wet treatment of zinc calcine. Background technique [0002] Hydro-smelting zinc is still the mainstream zinc smelting method in the industry. The annual zinc production of the hydro-smelting zinc method accounts for more than 80% of the total zinc production of the year, while the method of extracting zinc from zinc calcined sand through "leaching-purification-electrodeposition" is One of the most mainstream methods. However, the leaching process of zinc calcine is still a very cumbersome process. The essential reason is that in addition to zinc oxide (ZnO) which is easily soluble in acid, zinc calcine also contains a large amount of difficult-to-handle zinc ferrite (ZnFe 2 o 4 ), and a small amount of zinc silicate (ZnSiO 4 ). Zinc ferrite is a complex oxide that is very difficult to dissolve and can only be dissol...

Claims

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Application Information

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IPC IPC(8): C22B19/20C22B3/16C25C1/16
CPCC22B19/20C22B3/1616C25C1/16Y02P10/20
Inventor 窦爱春张也刘云建苏明如周玉陈耀东
Owner JIANGSU UNIV