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A method of improving zinc recovery rate in comprehensive recovery system

A recovery system and recovery rate technology, applied in the direction of process efficiency improvement, etc., can solve the problems such as not having, and achieve the effect of improving recovery rate, increasing zinc recovery rate, and reducing the increase of zinc content in water.

Active Publication Date: 2019-11-12
四川高锗再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, there is no method that can actually reduce the generation of silica gel and thereby increase the recovery rate of zinc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment provides a kind of method that improves zinc recovery rate of comprehensive recovery system, comprises the following steps:

[0028] Ripening: mix zinc oxide powder with H2O with a concentration of 150g / L 2 SO 4 The mixture is mixed according to the mass ratio of 4:1, and kept for 8 hours; then water is added according to 20% of the mass of the zinc oxide powder, immersed in water for 10 hours, and filtered to obtain zinc oxide ore.

[0029] (1) Low leaching: after low leaching of zinc oxide ore, low leaching liquid and low leaching slag are obtained; low leaching conditions: control SiO 2 The concentration is less than 1%, the pH value is controlled at 1.8, the liquid-solid ratio is 9:1, the leaching temperature is 65°C, the leaching time is 1.5h, and the leaching acidity is 1.5g / L;

[0030] (2) High leaching: after high leaching of low leaching residue, high leaching liquid and high leaching residue are obtained; high leaching conditions: liqu...

Embodiment 2

[0032] The present embodiment provides a kind of method that improves zinc recovery rate of comprehensive recovery system, comprises the following steps:

[0033] Ripening: mix zinc oxide powder with H2O at a concentration of 200g / L 2 SO 4 The mixture is mixed according to the mass ratio of 6:1, and kept for 12 hours; then water is added according to 20% of the mass of the zinc oxide powder, immersed in water for 12 hours, and the zinc oxide ore is obtained by filtration.

[0034] (1) Low leaching: after low leaching of zinc oxide ore, low leaching liquid and low leaching slag are obtained; low leaching conditions: control SiO 2 The concentration is less than 1%, the pH value is controlled at 1.8, the liquid-solid ratio is 9:1, the leaching temperature is 65°C, the leaching time is 1.5h, and the leaching acidity is 1.5g / L;

[0035] (2) High leaching: after high leaching of low leaching residue, high leaching liquid and high leaching residue are obtained; high leaching condit...

Embodiment 3

[0037] The present embodiment provides a kind of method that improves zinc recovery rate of comprehensive recovery system, comprises the following steps:

[0038] Ripening: mix zinc oxide powder with H2O with a concentration of 180g / L 2 SO 4 Mix the materials according to the mass ratio of 5:1, and keep for 10 hours; then add water according to 20% of the mass of the zinc oxide powder, carry out water immersion for 11 hours, and filter to obtain zinc oxide ore.

[0039] (1) Low leaching: after low leaching of zinc oxide ore, low leaching liquid and low leaching slag are obtained; low leaching conditions: control SiO 2 The concentration is less than 1%, the pH value is controlled at 1.8, the liquid-solid ratio is 9:1, the leaching temperature is 65°C, the leaching time is 1.5h, and the leaching acidity is 1.5g / L;

[0040](2) High leaching: after high leaching of low leaching residue, high leaching liquid and high leaching residue are obtained; high leaching conditions: liquid...

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Abstract

The invention belongs to the technical field of zinc smelting recovery, and provides a method for increasing the zinc recovery rate of a comprehensive recovery system. The method comprises the following steps that (1) low leaching is conducted, specifically, zinc oxide ore is subjected to low leaching, low leaching liquid and low leaching slag are obtained, and low leaching meets the conditions that the concentration of SiO2 is controlled to be 1% or lower, the pH value is controlled to be 1.5-2.0, the liquid-solid ratio is 8-10:1, the leaching temperature is 60-70 DEG C, leaching time is 1.5h, and leaching acidity is 1-2 g / L; and (2) high leaching is conducted, specifically, low leaching slag is subjected to high leaching, high leaching liquid and high leaching slag are obtained, and high leaching meets the conditions that the liquid-solid ratio is 5-7:1, the leaching temperature is 80-90 DEG C, leaching time is 3 h, and leaching final acidity is 50-60 g / L. The method is scientific in design, leaching of zinc can be improved, the zinc content of water in slag caused by difficult filtration is lowered, and thus the zinc recovery rate of the whole comprehensive recovery system is increased.

Description

technical field [0001] The invention belongs to the technical field of zinc smelting and recovery, and in particular relates to a method for improving the recovery rate of zinc in a comprehensive recovery system. Background technique [0002] The zinc content in the waste slag produced by the zinc smelting comprehensive recovery system is still very high, generally 12-15%. For zinc oxide ore, it mainly refers to ZnO, and contains zinc sulfide ZnS, zinc silicate ore Zn 2 SiO 4 and hemimorphite Zn 4 (Si 2 o 7 )(OH).H 2 O. When this kind of ore is treated by wet method, it is often difficult to clarify and filter due to the large amount of silica gel produced during acid leaching, and a large amount of water containing zinc is formed, which affects the recovery rate of zinc. [0003] In order to obtain a pulp that is easy to filter, after long-term research and unremitting efforts, it has been found that the presence of silicon in the pulp is affected by the following fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B19/20
CPCC22B3/08C22B19/22Y02P10/20
Inventor 曾维泉
Owner 四川高锗再生资源有限公司
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