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Method for recycling sulfur and silver of 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 low recovery rate of elemental sulfur, large amount of slag, high energy consumption of sulfur, etc. The effect of recovery rate and good economy

Active Publication Date: 2019-05-10
CINF ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for recycling sulfur and silver of 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 recycling sulfur and silver of zinc oxygen-pressure leaching residue and belongs to the technical field of non-ferrous metal recycling. The method comprises the following steps: (1) performing primary dehydrating treatment; (2) adding a flocculant for rough flotation; (3) adding a dispersing agent into roughing concentrate and performing three-section concentrating; (4) performing three-section scavenging on rougher tailings; (5) mixing ore tailings I, II and III and treating middlings, acquiring sulfur concentrate by mixing middling roughing concentrate and ore concentrates, and taking silver-rich residue as tailings. The invention aims to solve the problems of small sulfur grains and incapability of efficiently recycling precious metal Ag during the process of zinc oxygen-pressure leaching; polyacrylamide is added as the flocculant for realizing carrier flotation; the problem of high viscosity caused by iron contained in zinc oxygen-pressure leaching residue solution is solved; the recovery rate of sulfur and precious metal Ag is increased; the dispersing agent is added in the flotation process and microwave treatment is performed, so that thedispersion of sulfur after flocculation is realized, the problem of difficulty in separating sulfur from precious metal is solved, and the grade of sulfur product is promoted.

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 Applications(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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