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A kind of method for recovering sulfur and silver from zinc-oxygen pressure leaching residue

A technology for leaching slag and zinc oxide, which is applied in the direction of chemical instruments and methods, sulfur compounds, process efficiency improvement, etc., can solve the problems of high energy consumption of sulfur, large amount of slag, difficulty in comprehensive and efficient recovery of Ag and Sn, etc.

Active Publication Date: 2021-04-09
CINF ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sulfur grade of sulfur concentrate during leaching slag flotation is low (~80%, elemental sulfur content ~72%), resulting in a large amount of slag during hot-melt filtration of sulfur concentrate and low recovery rate of elemental sulfur, so that the unit product The disadvantages of high energy consumption of sulfur; at the same time, during the flotation of sulfur concentrate in the leaching slag, the Ag and Sn in the leaching slag are dispersed in the sulfur concentrate and the tailings after flotation of the sulfur concentrate. Efficient recycling poses a relatively large difficulty

Method used

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  • A kind of method for recovering sulfur and silver from zinc-oxygen pressure leaching residue

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Embodiment 1

[0028] The invention provides a method for recovering sulfur and silver from zinc oxygen pressure leaching slag, comprising the following steps:

[0029] (1) After zinc oxygen pressure leaching, the zinc concentrate is preliminarily dehydrated in a thickener to obtain a zinc oxygen pressure leaching slag slurry with a concentration of 32%, which contains 4.5% zinc, 250g / t silver, 6.2% lead, and 13%, sulfur 60%;

[0030] (2) Add polyacrylamide to the zinc oxygen pressure leaching slag slurry prepared in step (1), the addition amount is 65g / t, control the rotating speed and maintain the thickness of the foam layer, and carry out roughing to obtain roughing concentrate and roughing tailings mine;

[0031] (3) add lignin to the roughing concentrate prepared in step (2), the addition is 50g / t, carry out three sections of selection, carry out microwave treatment in the selection process, three sections of selection microwave power are respectively 800W, 1200W, 1600W, the microwave...

Embodiment 2

[0035] The invention provides a method for recovering sulfur and silver from zinc oxygen pressure leaching slag, comprising the following steps:

[0036] (1) After zinc oxygen pressure leaching, the zinc concentrate is preliminarily dehydrated in a thickener to obtain a zinc oxygen pressure leaching slag slurry with a concentration of 40%, which contains 3.2% zinc, 330g / t silver, 5.6% lead, and iron 44%, sulfur 35%;

[0037] (2) Add starch to the zinc oxygen pressure leaching slag slurry prepared in step (1), the addition amount is 80g / t, control the rotating speed and maintain the thickness of the foam layer, and carry out roughing to obtain roughing concentrate and roughing tailings;

[0038] (3) add water glass to the rougher concentrate prepared in step (2), the addition is 100g / t, carry out three sections of selection, carry out microwave treatment in the selection process, three sections of selection microwave power are respectively 1000W, 1300W, 1800W, the microwave fr...

Embodiment 3

[0042] The invention provides a method for recovering sulfur and silver from zinc oxygen pressure leaching slag, comprising the following steps:

[0043] (1) After the zinc concentrate is leached by oxygen pressure, it is preliminarily dehydrated in a thickener to obtain a zinc oxygen pressure leaching slag slurry with a concentration of 23%, which contains 2.1% zinc, 120g / t silver, 3.4% lead, and iron 52%, sulfur 52%;

[0044](2) Add polyacrylamide to the zinc oxygen pressure leaching slag slurry prepared in step (1), the addition amount is 20g / t, control the rotating speed and maintain the thickness of the foam layer, and carry out roughing to obtain roughing concentrate and roughing tailings mine;

[0045] (3) Add lignin to the roughing concentrate prepared in step (2), the addition is 70g / t, carry out three sections of selection, carry out microwave treatment in the selection process, three sections of selection microwave power are respectively 1200W, 1400W, 1600W, the m...

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Abstract

The invention discloses a method for recovering sulfur and silver from zinc-oxygen pressure leaching slag, which belongs to the technical field of non-ferrous metal recovery. The method includes: (1) preliminary dehydration treatment; (2) adding flocculant for rough selection; (3) adding flocculant to Add a dispersant to the roughing concentrate for three-stage beneficiation; (4) sweep the roughing tailings for three stages; (5) combine the beneficiation I, II, and III tailings for middling treatment, and middling The rough concentrate and selected concentrate are combined into sulfur concentrate, and the tailings are silver-rich slag. The present invention aims at the problem that the sulfur particles are small and the precious metal Ag cannot be effectively recovered in the zinc oxygen pressure leaching process, and polyacrylamide is added as a flocculant to realize carrier flotation, and at the same time, the viscosity of the zinc oxygen pressure leaching slag solution containing iron is solved High problem, improve the recovery rate of sulfur and precious metal Ag. By adding a dispersant in the flotation process and carrying out microwave treatment, the dispersion of sulfur after flocculation is realized, the problem of difficult separation of sulfur and precious metals is solved, and the grade of sulfur products is improved.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recovery, and in particular relates to a method for recovering sulfur and silver from zinc oxygen pressure leaching slag. Background technique [0002] Among the zinc resources in my country, the material composition of lead-zinc deposits is complex, and there are many co-associated components. Co-associated zinc concentrate is usually processed by traditional boiling roasting-leaching process, which is easy to form zinc ferrite. The zinc leaching rate is low in conventional leaching, and the leaching residue needs to be treated by high temperature and high acid or volatilization process: high temperature and high acid treatment for leaching When slag is used, the iron content in the leach solution is high, the slag amount of iron removal in the leach solution is large, and the loss of zinc is large; if the volatilization process is used for treatment, the recovery rate of co-associated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/027C22B3/00C22B7/00
CPCY02P10/20
Inventor 罗虹霖冯泽平刘自亮何醒民
Owner CINF ENG CO LTD
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