Zinc calcined sand short-process hydrometallurgy method

A technology for hydrometallurgical zinc and zinc calcining, which is applied in the improvement of process efficiency, instruments, optics, etc., can solve the problems of heavy workload, harsh control of iron precipitation process conditions, and long time, so as to improve production efficiency and simplify The effect of leaching process and shortening process flow

Active Publication Date: 2022-06-21
JIANGSU UNIV
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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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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Zinc calcining sand of a zinc factory mainly becomes (wt%): Zn 57.45, Fe 9.63, Si 1.45, Pb 1.60, Cu1.07, Mn 0.76, Ca 0.62, Al 0.42, Cd 0.25, Mg 0.16 and S 1.90.

[0022] Reagent (component content, wt%): food grade aminoacetic acid, content ≥99%; industrial grade iminodiacetic acid, content ≥98%; analytical pure sodium hydroxide, content ≥99%.

[0023] (1) At 70 °C, the pH value of the mixed aqueous solution of aminoacetic acid and iminodiacetic acid is adjusted to 8.0 with sodium hydroxide, and the total concentration of aminoacetic acid ions is 3.5 mol / L and the total concentration of iminodiacetic acid is 3.5 mol / L. 150 mL of 0.2 mol / L mixed-type system aqueous solution was added to a 200 mL autoclave.

[0024] (2) In the autoclave, add 15g of zinc calcine at a liquid-solid ratio of 10:1, tighten the autoclave and heat up to 140°C, and stop the heating reaction after 4 hours of reaction. When the temperature in the kettle drops below 60°C, solid-liquid separation is...

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Abstract

The invention belongs to the field of zinc calcine wet treatment, and in particular relates to a short-flow zinc calcine wet process zinc smelting method. In a closed container, the mixed system of aminoacetate and iminodiacetate is used for high-temperature enhanced dissolution of zinc calcine. During the leaching process, the valuable metals lead, cadmium, copper, nickel and cobalt are together with the main metal zinc. Dissolved into the leaching solution, impurities such as iron, silicon, calcium and magnesium are not dissolved and remain in the leaching residue. After the leaching solution is reduced and purified by zinc powder, zinc is extracted by electrowinning. Direct one-step selective zinc leaching to realize the separation of zinc and iron, avoiding the complicated two-stage leaching and iron precipitation process of the existing process, simplifying the leaching process, shortening the process flow of zinc extraction by zinc calcination wet method, and improving production efficiency.

Description

technical field [0001] The invention belongs to the field of zinc calcine wet processing, in particular to a method for preparing electrozinc by short-process wet processing of zinc calcine. Background technique [0002] Hydro-zinc smelting is still the mainstream zinc smelting method in the industry. The annual zinc output of the hydro-zinc smelting method accounts for more than 80% of the total zinc output of the year. One of the most popular methods. However, the leaching process of zinc calcine is still a very cumbersome process. 2 O 4 ), and a small amount of zinc silicate (ZnSiO 4 ). Zinc ferrite is a very insoluble complex oxide, which can only be dissolved under high temperature and high acid conditions. The widely used zinc calcine leaching process is two-stage leaching. The first stage uses medium acid (or low acid) to leaching easily soluble zinc oxide, and the insoluble zinc ferrite in the middle leaching residue is leached with high temperature and high aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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