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Desiliconization process in zinc hydrometallurgy

A technology of hydro-method zinc smelting and desiliconization, which is applied in the direction of improving process efficiency, etc., can solve the problems that can not completely solve silica gel, hinder filtration, and the effect of desiliconization is not very obvious, so as to improve metal recovery rate, improve adaptability, good filtering speed

Active Publication Date: 2012-12-19
BAIYIN NONFERROUS GROUP
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Problems solved by technology

The disadvantage of this method is that, although the coagulation volume of silica gel increases, the desilication is still in the form of coagulation of silica gel, which cannot completely solve the problem that silica gel is easy to stick to the filter cloth and hinder filtration, and the desiliconization effect is not very obvious.

Method used

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Embodiment Construction

[0030] The present invention realizes desiliconization through the control of specific parameters on the basis of the original process steps of "neutral leaching → acid leaching → pre-neutralization → sinking alum and iron removal" in hydrometallurgy, and the control process is as follows:

[0031] (1) pH control

[0032] Middle leaching pH control

[0033] In the neutral leaching step, the pH value of the leaching pulp is alternately controlled between 1.5~2.0 and 3.5~4.0 in the middle leaching chute. Specifically, after the pH value is controlled at 1.5~2.0 and reacted for 20~40 minutes, the pH value is immediately increased React to 3.5~4.0 for 20~40 minutes, then import the pulp in the leaching tank into the leaching tank for reaction, add the pulp to the leaching chute and adjust the pH value in the leaching chute to 1.5~2.0, and operate in a cycle. This alternate operation not only avoids the precipitation of silica gel in the pH range of 2.0-2.5, but also easily ensu...

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Abstract

The invention belongs to the technical field of zinc hydrometallurgy and relates to a desiliconization process in the zinc hydrometallurgy. The process mainly controls pulp in a soaking groove to alternately react in a pH value region between 1.5-2.0 and 3.5-4.0 on the basis of process steps of zinc hydrometallurgy such as neutral leaching, acid leaching, preneutralization, vitriol sediment and iron removal, avoids a pH value region between 2.0-2.5 when silica gel is easy to separate out, and easily guarantees finish pH value of leached central and upper clear liquid. The desiliconization process is simple in process requirement and obvious in desiliconization effect, obviously improves a pulp filtration rate, and improves adaptability of raw materials.

Description

technical field [0001] The invention belongs to the technical field of zinc hydrometallurgy and relates to a desiliconization process in zinc hydrometallurgy. Background technique [0002] In the hydrometallurgy zinc leaching process, calcined soluble silicon (mainly Zn 2 SiO 4 When the content is 2.5~3.5% or higher, a large amount of silica gel will be formed, the leaching residue will deteriorate sharply, the residue will not form, and the filtrate will be difficult to filter, seriously affecting the yield of the supernatant. The general leaching method will lead to a large amount of silica gel in the leaching solution, making it difficult to clarify, filter, and wash the pulp, which seriously affects the output of the supernatant and the zinc content of the slag. Commonly used desiliconization techniques such as anion and cation methods are based on the neutralization of negatively charged silica gel and positively charged aluminum sulfate plasma to coagulate the silica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/06C22B3/44
CPCY02P10/20
Inventor 王新文段小维刘安强冶玉花刘向东梁燕罗启顺
Owner BAIYIN NONFERROUS GROUP
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