Method for reducing water-soluble zinc in zinc-containing slag produced in zinc hydrometallurgy

A technology of hydrometallurgy and water-soluble zinc, which is applied in the direction of improving process efficiency, etc., to achieve the effects of saving costs, less investment, and improving zinc recovery rate

Active Publication Date: 2013-07-31
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for reducing water-soluble zinc from the zinc-containing slag of hydrometallurgy to solve the problems in the above-mentioned various methods

Method used

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  • Method for reducing water-soluble zinc in zinc-containing slag produced in zinc hydrometallurgy

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Send the slurry-like zinc-containing slag produced by the hydrometallurgy system into the box filter press to complete the initial feeding, and then enter the special primary filter press to obtain the primary filtrate and filter residue, and the filter residue is left in the box filter press. In the filter machine, the primary filtrate is returned to the leaching process; 10% of the weight of the filter residue obtained in the previous filter press cycle is added to the pulping tank equipped with waste water, the temperature of the pulp is adjusted to 40 °C, and the liquid-solid ratio of the pulp is 3:1. Obtain the zinc-containing slag after slurrying, send in the filter press and merge with the filter residue therein and carry out secondary pressure filtration, obtain secondary filtrate and filter residue, secondary filtrate and primary filtrate merge and return leaching process, filter residue 10% (weight ) to the slurry tank, and the rest are returned to the lead sys...

example 2

[0025] 15% of the filter residue (weight) is sent into the slurrying tank, the controlled slurrying temperature is 60° C., the liquid-solid ratio of the ore slurry is 6: 1, and all the other are the same as in Example 1.

example 3

[0027] 30% of the filter residue (weight) is sent into the slurrying tank, the controlled slurrying temperature is 70° C., the liquid-solid ratio of the ore slurry is 2: 1, and all the other are the same as in Example 1.

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Abstract

The invention discloses a method for reducing water-soluble zinc in zinc-containing slag produced in zinc hydrometallurgy. The method is characterized in that the method comprises steps that: A, zinc-containing slag in a pulp state is subject to primary press-filtration in a box-type filter press, such that primary filtrate and filter residue are obtained; the filter residue is left in the box-type filter press; B, the primary filtrate obtained in the step A is delivered back to a leaching process; the filter residue left in the box-type filter press is combined with pulped zinc-containing slag additionally pumped into the filter press, and secondary press-filtration is carried out, such that secondary filtrate and filter residue are obtained; C, the secondary filtrate obtained in the step B is combined with the primary filtrate; the mixture is delivered back to the leaching process; one part of the obtained filter residue is delivered to a pulping tank, and prepared pulped zinc-containing slag is delivered to the box-type filter press; the other part of the filter residue is delivered back to a lead system or a zinc system in which valuable metals are recycled, such that a press filtration period is accomplished. In the pulping process, a pulping temperature is controlled at 40 to 70 DEG C, and a liquid-solid ratio is controlled at 2-6:1. The method provided by the invention is mainly used for reducing water-soluble zinc in zinc-containing slag produced in a filtration process of zinc hydrometallurgy enterprises.

Description

technical field [0001] The invention relates to a method for reducing water-soluble zinc, in particular to a method for reducing water-soluble zinc from zinc-containing slag of hydrometallurgy. Background technique [0002] The main intermediate slag materials in the zinc hydrometallurgy system include ore powder leaching slag, zinc oxide leaching slag (lead slag), iron slag, high acid leaching slag, sulfur slag, etc. Squeeze box type filter press, the slag contains about 22% water, and the slag contains high water-soluble zinc (4.0-5.5%). If it is directly processed in a volatilization kiln, the zinc loss rate is as high as 10%, and the slag contains high zinc, which increases the system capacity. production cost; if directly sent to the lead system for processing, the loss of zinc in the lead slag is as high as 30%. How to reduce the water-soluble zinc in the slag will directly affect the recovery rate of zinc in the hydrometallurgy process. [0003] At present, the meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/30
CPCY02P10/20
Inventor 刘朗明陈爱国李向东袁建明何纯海李敦华钟谦陈敬阳邓奕小周礼要王瑞红赵晓朝
Owner ZHUZHOU SMELTER GRP
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