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Method for reducing contents of zinc and copper in smelting ash acid leaching residues

A fuming acid and leaching slag technology, applied in the field of smelting, can solve the problems of large sulfuric acid consumption and high heat energy

Active Publication Date: 2013-01-02
江西自立环保科技有限公司
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of concentrated sulfuric acid roasting-water leaching process needs to consume a large amount of sulfuric acid and high heat energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The composition of a typical smelting soot leaching slag is shown in Table 1:

[0021] Table 1 Composition of smelting soot leaching slag (%)

[0022] Zn Cu Pb sn Fe Cd Ni 8.5 1.7 26.3 15.3 0.8 0.05 0.07

[0023] ①Stacking

[0024] According to the chemical composition of smelting soot leaching slag shown in Table 1, when organizing production, the leaching slag is piled up in a trapezoidal shape in the drying yard, divided into several piles, and a hot air duct is installed between the piles. Spray the wet zinc smelting waste liquid containing sulfuric acid 40g / L, control the moisture content to 20%, and pile up for 15 days;

[0025] ② Leaching

[0026] According to the liquid-solid ratio of 10:1, the concentration of sulfuric acid leaching agent is 60 g / L, hot air above 100°C is blown into the pulp, the leaching temperature is controlled at 90°C, and the leaching time is 2h, and the leaching slag described in step ① i...

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Abstract

The invention discloses a method for reducing the contents of zinc and copper in smelting ash acid leaching residues. The method is characterized in that the method comprises a pretreatment technology and a leaching technology of the smelting ash acid leaching residues, wherein the pretreatment technology comprises the following steps: stacking the smelting ash acid leaching residues, carrying out hot air baking through utilizing the waste heat of a smelting smoke, overturning with a forklift once every 2-3 days, and airing for 10-30 days; and the leaching technology comprises a step that aired residues undergo oxidation leaching through filling with air under a low acid condition. The method which allows the aired acid leaching residues to be leached again enables the zinc leaching rate to be improved by 10% and the copper leaching rate to be improved by 20%; the method adopting stacking airing does not need special equipment, and basically does not consume energy; and no need of high acid condition and low acid consumption are realized in the leaching of the aired leaching residues.

Description

technical field [0001] The invention belongs to the technical field of smelting, and relates to a method for reducing the content of zinc and copper in smelting soot acid leaching residue. Background technique [0002] After the smelting soot is leached by acid, the leaching slag still contains a small amount of zinc-copper phase which is difficult to leaching. It is necessary to re-treat the leaching slag to improve the leaching rate and recovery rate of zinc and copper. [0003] The rotary kiln volatilization method used to be a typical process used in the treatment of zinc hydrometallurgy slag. This method is to dry the zinc leaching slag (containing H 2 O: 12% -18%) and 45% -55% coke powder are added to the rotary kiln, and the slag Zn is reduced and volatilized at a high temperature of 1 100 - 1 300 ℃, and then recovered with ZnO powder. The process is long, the maintenance of equipment is large, and the investment is high; the working environment is poor; a large amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B3/08C22B15/00C22B19/00
CPCY02P10/20
Inventor 叶标宁建平程近辰
Owner 江西自立环保科技有限公司
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