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Method for optimizing zinc-hydrometallurgy hot acid leaching process by pressure leaching

A technology for hot acid leaching and hydrometallurgy zinc, applied in the field of zinc hydrometallurgy, can solve the problems of large amount of jarosite slag, unstable properties of jarosite slag, long process flow, etc. Environmental protection and social benefits, the effect of reducing the amount of iron slag

Active Publication Date: 2014-07-30
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hot acid leaching-jadosite iron removal has a long process, many procedures, low metal recovery rate, large amount of ajadosite slag, etc., and the quality of ajadosite slag is unstable, which has great potential pollution to the environment.

Method used

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  • Method for optimizing zinc-hydrometallurgy hot acid leaching process by pressure leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 50g zinc sulfide concentrate (grain size-50um accounts for 96%, zinc: 53.04%, iron 5.70%, sulfur 29.27%) and 750ml hot acid leaching solution (Zn116g / L, H 2 SO 4 40g / L, Fe11.5g / L), add lignosulfonate 0.4%, heat to 130°C, feed oxygen, the oxygen partial pressure is 0.6MPa, control the oxidation leaching reaction temperature 130-140°C, react for 3 hours, in During the pressure leaching process, no other additives and catalysts are needed except for oxygen and lignosulfonate. After the reaction, the slurry is filtered to obtain 680ml leachate (containing Zn: 149g / l, Fe: 2.69g / l, H 2 SO 4 : 10.2g / L) and 37.4g leaching slag (zinc: 2.14%, Fe19.25%, sulfur 35.7%). 96.98% of the zinc is leached during the pressure oxidation leaching process.

Embodiment 2

[0025] Add 50g zinc sulfide concentrate (grain size-50um accounts for 96%, zinc: 53.04%, iron 5.70%, sulfur 29.27%) and 700ml hot acid leaching solution (Zn116g / L, H 2 SO 4 40g / L, Fe11.5g / L), add lignosulfonate 0.4%, heat to 130°C, feed oxygen, the oxygen partial pressure is 0.6MPa, control the oxidation leaching reaction temperature 130-140°C, react for 3 hours, in During the pressure leaching process, no other additives and catalysts need to be added except oxygen and lignosulfonate. After the reaction, the slurry is filtered to obtain 625ml leachate (containing Zn: 154g / l, Fe: 1.54g / l, H 2 SO 4 : 8.9g / L) and 36.1g leaching slag (zinc: 1.92%, Fe22.56%, sulfur 38.4%). 97.39% of the zinc was leached during the pressure oxidation leaching process.

Embodiment 3

[0027] Add 50g zinc sulfide concentrate (grain size-50um accounts for 96%, zinc: 53.04%, iron 5.70%, sulfur 29.27%) and 720ml hot acid leaching solution (Zn116g / L, H 2 SO 4 40g / L, Fe11.5g / L), add lignosulfonate 0.4%, heat to 130°C, feed oxygen, the oxygen partial pressure is 0.6MPa, control the oxidation leaching reaction temperature 130-140°C, react for 3 hours, in During the pressure leaching process, no other additives and catalysts need to be added except oxygen and lignosulfonate. After the reaction, the slurry is filtered to obtain 645ml leachate (containing Zn: 152g / l, Fe: 2.41g / l, H 2 SO 4 : 9.6g / L) and 36.3g leaching slag (zinc: 1.98%, Fe19.35%, sulfur 34.9%). 97.29% of the zinc was leached during the pressure oxidation leaching process.

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Abstract

The invention discloses a method for optimizing zinc-hydrometallurgy hot acid leaching process by pressure leaching. A new technique is easily engaged with an existing process, and a pressure leaching process is introduced in an existing hot acid leaching process. The method is characterized in that in the process of optimizing, zinc concentrates are leached by using a section of hot acid leaching liquor in a hot acid leaching process, and in the process of pressure leaching, the oxidation and precipitation of iron materials are realized; pressure leaching ore pulp is subjected to solid-liquid separation, liquid supernatant is fed back for neutral leaching, and filter residues are conveyed for flotation so as to enrich sulfur concentrates and iron slag. An associated process provided by the invention is short in process; zinc immersion and iron removal are realized in a reaction container, so that the leaching efficiency is high, thereby realizing the clean production of the zinc smelting industry.

Description

technical field [0001] The invention belongs to the technical field of zinc hydrometallurgy, and relates to a method for optimizing the hot acid leaching process of hydrometallurgy zinc by pressure leaching. Background technique [0002] At present, 90% of zinc smelting in my country adopts the traditional hydrometallurgy process, and only a few domestic enterprises such as Shaoguan Smelter and Huludao Zinc Plant still use pyrometallurgy. [0003] The technological process of hydrometallurgy zinc is "roasting-leaching-purification-electrodeposition". Zinc sulfide concentrate is desulfurized by boiling oxidation roasting, the sulfur dioxide flue gas produced is sent to acid production, and the calcined sand is sent to leaching to obtain qualified zinc sulfate solution after purification, and then electrowinning to produce electrolytic zinc. According to the different treatment methods of zinc leaching slag, zinc hydrometallurgy is divided into rotary kiln volatilization meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/04
CPCY02P10/20
Inventor 蒋开喜王海北张邦胜邹小平赵磊蒋伟张磊刘三平王玉芳魏帮汪胜东蒋训雄
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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