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Multisection acid leaching, multistage countercurrent washing and filter pressing integrated system and method

A technology of countercurrent washing and acid leaching, which is applied to chemical instruments and methods, separation methods, filtration and separation, etc. It can solve problems such as multiple washing effects of equipment, poor process water, and complicated processes, so as to realize the concept of clean production and reduce environmental pollution. Risk, Effect of Simplified Steps

Inactive Publication Date: 2011-05-25
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many enterprises and research institutes at home and abroad have done a lot of research, invented many patented technologies, and many processes have been applied in actual production, but generally speaking, the efficient acid leaching of zinc calcine and the efficient washing of water-soluble zinc residues are still It has not been well solved, and there are problems such as complicated process, many equipments, poor washing effect and even system process water expansion

Method used

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  • Multisection acid leaching, multistage countercurrent washing and filter pressing integrated system and method
  • Multisection acid leaching, multistage countercurrent washing and filter pressing integrated system and method
  • Multisection acid leaching, multistage countercurrent washing and filter pressing integrated system and method

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Embodiment 1

[0051] As a specific embodiment of the present invention, the integrated system of the present invention is used to carry out integrated treatment of multi-stage acid leaching, multi-stage countercurrent washing, and pressure filtration on zinc calcine. The zinc calcine used in this embodiment is dissolved in water The zinc content is 127g / l (as Zn 2+ ), the content of undissolved zinc in the residual zinc slag filter cake after acid leaching is 16%, and the content of water-soluble zinc is 5% (calculated as Zn). Such as figure 1 As shown, the specific implementation steps are as follows:

[0052] 1) Open the control valves 10, 20, 21 and the pump 2, inject the zinc calcine in the feeding tank 1 into the membrane filter press 3 directly, and the filter press fluid flows into the filtrate pool 8, when the filter residue fills the entire membrane filter press When the filter plate chamber of the machine 3 is closed, the pump 2 and the control valves 10, 20, 21 are closed;

[...

Embodiment 2

[0062] As another specific embodiment of the present invention, a simplified process of the integrated system of the present invention is used to carry out multi-stage acid leaching, multi-stage countercurrent washing, and pressure filtration integrated treatment on zinc calcine. The zinc calcine used in this embodiment The content of water-soluble zinc in the acidic leaching solution of the first stage of sand is 134g / l (as Zn 2+ ), the content of undissolved zinc in the residual zinc slag filter cake after acid leaching is 17.4%, and the content of water-soluble zinc is 4.3% (in terms of Zn), such as figure 2 As shown, the specific implementation steps are as follows:

[0063] 1) Open the control valves 10, 20, 21 and the pump 2, inject the zinc calcine in the feeding tank 1 into the membrane filter press 3 directly, and the filter press fluid flows into the filtrate pool 8, when the filter residue fills the entire membrane filter press When the filter plate chamber of the...

Embodiment 3

[0072] As another specific embodiment of the present invention, another simplified process of the integrated system of the present invention is used to carry out the integrated treatment of secondary countercurrent washing and pressure filtration on the zinc calcine, and the water-soluble The content of zinc is 131g / l (as Zn 2+ meter), the water-soluble zinc content in the residual zinc slag filter cake after acid leaching is 4.7% (in terms of Zn), such as image 3 As shown, the specific implementation steps are as follows:

[0073] 1) Open the control valves 10, 20, 21 and the pump 2, inject the zinc calcined sand leachate in the feeding tank 1 directly into the diaphragm filter press 3, and the press filter liquid flows into the filtrate pool 8, when the filter residue fills the entire diaphragm filter press 3 When the filter plate chamber is closed, close the pump 2 and close the control valves 10, 20, 21;

[0074]2) Open the control valves 11, 14 and 17, open the pump 22...

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Abstract

The invention relates to a multisection acid leaching, multistage countercurrent washing and filter pressing integrated system and method which are applicable to industries such as the metallic zinc electrolysis industry, hydrometallurgy and the like. The system provided by the invention comprises a membrane filter press, wherein the feed port end of the membrane filter press is connected with a zinc calcine acid leaching liquor feed pool, and the discharge port end of the membrane filter press is respectively connected with a filtrate pool and a collection liquor pool; and a waste electrodeposit liquor circulation pool, a circulation washing pool and a clean washing water pool are connected in parallel between the feed port end and discharge port end of the membrane filter press. The method provided by the invention comprises the following steps: (1) feeding materials; (2) carrying out multisection acid leaching by using the waste electrodeposit liquor at different temperature gradients; (3) carrying out multistage countercurrent washing by using zinc-containing washing water of different concentrations; and (4) carrying out filter pressing on the filter cake. According to the invention, the content of water-soluble zinc (in terms of Zn) in zinc waste slag in the mainstream technique in metallic zinc electrolysis industry at present can be reduced from 3.5-6.0% to below 0.5%; and the acid leaching and washing efficiency are greatly enhanced, and the acid leaching recovery rate of zinc ore can be higher than 97%.

Description

technical field [0001] The invention relates to a system and method integrating multi-stage acid leaching, multi-stage countercurrent washing and pressure filtration, which is applied to the electrolytic metal zinc industry to extract and recover zinc from zinc ore and hydrometallurgy and other related industries. Background technique [0002] Zinc is an important non-ferrous metal raw material, which is widely used in the production of galvanizing, copper alloys and batteries. The production of zinc is mainly based on wet electrolysis, which mainly adopts the production process of acid leaching of zinc concentrate or zinc calcined sand produced after roasting, leaching solution purification and electrodeposition. Among them, acid leaching includes one-stage acid leaching, two-stage acid leaching and three-stage acid leaching, but most of them use two-stage acid leaching. [0003] The zinc ore used is mainly zinc sulfide ore. Because it is difficult to leaching directly, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B3/08C22B3/22B01D25/12C22B19/00
CPCY02P10/20
Inventor 段宁潘涔轩汝振广刘闺华王璠周长波但智钢降林华
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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