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Preparation of a kind of alumina slag cold consolidation reduction pellets and its recovery process for simultaneous sulfur fixation of lead, zinc and iron

A process method and technology of jarosite slag are applied in the field of preparation of jarosite slag cold consolidation reduction pellets and the field of synchronous sulfur fixation of lead, zinc and iron recovery, and can solve the problem of large dosage of chemicals, pollution of the environment by sulfur volatilization, low roasting efficiency, etc. problems, to achieve efficient and clean utilization, avoid sulfur emissions, and avoid the effects of difficult dehydration

Active Publication Date: 2019-02-05
HANZHONG ZINC IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since jarosite slag is a muddy waste with high water content and high sulfur content and complex components, the wet recovery of valuable metals has the disadvantages of large dosage of chemicals and serious environmental pollution. Roasting has low roasting efficiency, sulfur volatilization pollutes the environment, and valuable metals Problems such as low metal recovery rate and low product purity

Method used

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  • Preparation of a kind of alumina slag cold consolidation reduction pellets and its recovery process for simultaneous sulfur fixation of lead, zinc and iron
  • Preparation of a kind of alumina slag cold consolidation reduction pellets and its recovery process for simultaneous sulfur fixation of lead, zinc and iron

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Alumite slag contains Pb, Zn, Fe, S, H 2 O is 3.01%, 6.95%, 26.76%, 10.16%, and 35%, respectively. When the mass ratio of iron slag, lignite, and CaO is 100:25:27.5, the balling pressure is 12MPa, the balls are formed at 150°C for 10 minutes, and the balls are directly dried at 1250°C. Under the condition of reduction for 60 minutes, the volatilization rate of Pb and Zn were 96.97% and 99.89%, the rate of sulfur fixation was 98.91%, and the metallization rate of iron was 91.97%. The calcined sand adopts two-stage grinding and two-stage magnetic separation processes. The first-stage grinding fineness -74μm accounts for 95.97%, the first-stage magnetic field strength is 199.04kA / m, the second-stage grinding fineness-30μm accounts for 93.46%, and the second-stage magnetic field strength is 31.85kA / m Under the optimal conditions, iron concentrates with iron grades and recovery rates of 74.6% and 59.66% can be obtained, and iron concentrates contain 0.38% sulfur. Tailings ...

Embodiment 2

[0034] Alumite slag contains Pb, Zn, Fe, S, H 2 O is 3.01%, 6.95%, 26.76%, 10.16%, and 30%, respectively. When the mass ratio of alum slag, lignite, and CaO is 100:20:25, the balling pressure is 15MPa, the balls are dried at 150°C for 10 minutes, and the balls are directly Under the condition of reduction for 120min, the volatilization rate of Pb and Zn were 96.48% and 99.88%, the rate of sulfur fixation was 93.29%, and the metallization rate of iron was 82.59%. The calcined sand adopts two-stage grinding and two-stage magnetic separation processes. The first-stage grinding fineness -74μm accounts for 92.45%, the first-stage magnetic field strength is 199.04kA / m, the second-stage grinding fineness-30μm accounts for 93.53%, and the second-stage magnetic field strength is 31.85kA / m Under the optimal conditions, iron concentrates with iron grades and recovery rates of 72.0% and 57.10% can be obtained, and iron concentrates contain 0.36% sulfur. The tailings contain 18.13% and 2...

Embodiment 3

[0037] Alumite slag contains Pb, Zn, Fe, S, H 2O is 3.01%, 6.95%, 26.76%, 10.16%, and 40%, respectively, when the mass ratio of alumina slag, coking coal, and CaO is 100:25:27.5, the balling pressure is 15MPa, the balls are formed at 150°C for 10 minutes, and the balls are directly dried at 1250°C. Under the condition of reduction for 120min, the volatilization rate of Pb and Zn were 96.87% and 99.95%, the rate of sulfur fixation was 97.40%, and the metallization rate of iron was 91.63%. The calcined sand adopts two-stage grinding and two-stage magnetic separation processes. The first-stage grinding fineness -74μm accounts for 90.35%, the first-stage magnetic field strength is 199.04kA / m, the second-stage grinding fineness-30μm accounts for 93.53%, and the second-stage magnetic field strength is 31.85kA / m Under the optimal conditions, iron concentrates with iron grades and recovery rates of 73.4% and 60.50% can be obtained, and iron concentrates contain 0.45% sulfur. Tailing...

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Abstract

The invention relates to a ferroalumen slag cold-bonded and reduced pellet preparation and recycled lead, zinc and iron synchronous sulfur fixation process method. Firstly, ferroalumen slags, reducing coal and sulfur fixing agents are mixed and pressed into green ferroalumen slag cold-bonded and reduced pellets; the green ferroalumen slag cold-bonded and reduced pellets are dried, and preparation of ferroalumen slag cold-bonded and reduced pellets is finished; and the ferroalumen slag cold-bonded and reduced pellets are directly reduced and roasted at the temperature of 1100-1250 DEG C, smoke containing lead and zinc and roasted ore containing iron and sulfur are obtained, and ferroalumen slag cold-bonded and reduced pellet recycled lead, zinc and iron synchronous sulfur fixation is finished. The water-containing ferroalumen slags, the reducing coal and the sulfur fixing agents are made into the cold-bonded and reduced pellets, then a lead, zinc and iron chemical compound in the ferroalumen slags is directly reduced and subjected to synchronous sulfur fixation through high-temperature roasting, valuable metals including lead and zinc are recycled from the smoke, iron is recycled from the roasted ore, water difficult to remove in the ferroalumen slags is directly used, sulfur in the ferroalumen slags is fixed, and efficient and clean utilization of the valuable metals in the ferroalumen slags can also be achieved.

Description

【Technical field】 [0001] The invention belongs to the field of comprehensive utilization of industrial solid wastes and environmental protection, and relates to the preparation of jarosite slag cold-consolidated reduction pellets and a process method for recovering lead, zinc and iron and synchronously fixing sulfur. 【Background technique】 [0002] Jarosite slag is a kind of muddy acid slag (pH<5) produced by high-acid leaching solution in the zinc smelting process for iron removal. It has high water content and is difficult to remove. Fe, Ag, Ga, Ge, In and As, S and other components. Pb, Zn, and Fe usually exist in the form of various hydrous sulfates and ferrites, which have great water solubility. Generally, a wet zinc smelter with an annual output of 100,000 tons of electric zinc will produce about 30,000 to 50,000 tons of jarosite slag per year. At present, most of the alumina slags are only stored in nearby slag yards, which not only takes up valuable land resour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/248C22B5/10C22B13/02C22B19/30C22B7/02B02C21/00B02C23/14
CPCB02C21/00B02C23/14B02C2201/06C22B1/16C22B1/248C22B5/10C22B7/001C22B7/02C22B13/025C22B19/30Y02P10/20
Inventor 侯小强高文杰桂海平杨慧芬王亚运刘倩
Owner HANZHONG ZINC IND
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