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Method for extracting silver from silver-containing zinc concentrate and improving quality of zinc concentrate

A technology of zinc concentrate and zinc sulfide concentrate, which is applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of silver dispersion loss, low recovery rate, high energy consumption, etc., and achieve low cost, high quality, and easy operation. simple effect

Active Publication Date: 2013-08-28
德兴市益丰再生有色金属有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of high energy consumption, low recovery rate and long flow process in the existing silver recovery process of silver-containing zinc concentrate, and the silver in the zinc concentrate is mainly concentrated in the leaching slag, which leads to the dispersion and loss of silver. Provide a method for extracting silver from silver-containing zinc sulfide concentrate and improving the quality of zinc concentrate

Method used

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  • Method for extracting silver from silver-containing zinc concentrate and improving quality of zinc concentrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The chemical composition of a silver-containing zinc concentrate is (%): Zn44.5, Ag1.09, S29.14, Cu1.01, Pb0.83, Fe2.32, H 2 O4.6. First mix 100g of the silver-containing zinc concentrate with 100g of lead oxide fumes and 10.2g of pulverized coal, 250g of Na 2 CO 3 Fully mixed, the chemical composition of lead oxide dust is mainly (%): Pb74.36, Zn3.35, As0.72, Ag52g / t. The fully mixed material was reacted at 850°C for 120min. After the reaction, 75.21g of crude lead containing silver, 97.2% of crude lead grade, 1.01g of silver, and 93% of direct silver yield were obtained respectively after the reaction was finished. After the crude lead is separated, the smelting slag is leached with water, the leaching temperature is 75°C, the liquid-solid ratio of water and smelting slag is 5:1 (volume (ml) / mass (g)), and the leaching time is 30 minutes. After the leaching reaction, the liquid-solid separation was carried out, and the obtained leachate was evaporated and concentr...

Embodiment 2

[0023] The chemical composition of a silver-containing zinc concentrate is (%): Pb1.28, Zn39.72, As0.05, Fe8.20, S25.33, Ag726g / t. First the NaHCO that this silver-containing zinc concentrate of 67g and 33g lead oxide soot and 6g pulverized coal and embodiment 1 concentrated crystallization obtains 3150g is fully mixed, the chemical composition of lead oxide dust is mainly (%): Pb74.36, Zn3.35, As0.72, Ag52g / t. The fully mixed material was reacted at 870°C for 150min. After the reaction, 25.18g of silver-containing crude lead was obtained, the grade of crude lead was 98.1%, the silver content of smelting slag was 4g / t, and the direct silver recovery rate was 98%. After crude lead is separated, the smelting slag is leached with water, the leaching temperature is 60°C, the liquid-solid ratio of water to smelting slag is 4:1 (volume (ml) / mass (g)), and the leaching time is 60 minutes. After the leaching reaction, the liquid-solid separation was carried out, and the obtained lea...

Embodiment 3

[0025] The chemical composition of a silver-containing zinc concentrate is (%): Zn51.3, S27.46, Co0.0075, Pb2.83, Fe5.27, Cd0.119, As0.047, F0.004, Cl0.012, Ag1012g / t. First, mix 1000g of the silver-containing zinc concentrate with 1200g of lead oxide fumes and 180g of pulverized coal, 2000g of Na 2 CO 3 and 1000g NaOH are fully mixed, the chemical composition of lead oxide dust is mainly (%): Pb74.36, Zn3.35, As0.72, Ag52g / t. The fully mixed material was reacted at 890°C for 150min. After the reaction was finished, 927.6 g of crude lead containing silver, 98.1% of crude lead grade, 1.50 g of silver, and 92% silver yield were respectively obtained. After the crude lead is separated, the smelting slag is leached with water, the leaching temperature is 80°C, the liquid-solid ratio of water and smelting slag is 3:1 (volume (ml) / mass (g)), and the leaching time is 60 minutes. After the leaching reaction is finished, liquid-solid separation is carried out, and the obtained leac...

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Abstract

The invention discloses a method for extracting silver from a silver-containing zinc sulfide concentrate and improving quality of the zinc sulfide concentrate. The method comprises the following steps: mixing the silver-containing zinc sulfide concentrate with a proper amount of lead oxide flue dust, a sodium salt and a reducing agent and carrying out heating and a complete reaction, wherein silver-containing crude lead and smelt slag are obtained after completion of the reaction; subjecting the silver-containing crude lead to electrolysis to obtain electric lead and silver powder; subjecting the smelt slag to water leaching; and carrying out liquid-solid separation after water leaching and subjecting a filtrate to evaporative concentration and crystallization so as to obtain the sodium salt which can be returned and reused as a flux, wherein leaching slag is a desilverized zinc sulfide concentrate with higher quality. With the method provided by the invention, high efficiency desilverization, dearsenification, cadmium removal and fluorine and chlorine removal of the silver-containing zinc concentrate can be realized, the electric lead, the silver powder and the high-grade zinc sulfide concentrate product are produced, and the sodium salt used as the flux in the reaction is not consumed and can be regenerated through evaporative concentration and crystallization after the reaction, thereby realizing cyclic usage of the flux. The method has the advantages of short flow, good environment-friendliness, high economic benefits and the like and is suitable for industrial popularization and application.

Description

technical field [0001] The invention relates to the field of nonferrous metal metallurgy, in particular to a method for extracting silver from silver-containing zinc sulfide concentrate and improving the quality of the zinc sulfide concentrate. Background technique [0002] At present, 80% of zinc is produced by wet process, and the zinc sulfide concentrate usually contains a small amount of silver. In the process of zinc hydrometallurgy, almost all the silver contained in the zinc concentrate remains in the leaching slag. For example, usually the lead-silver slag contains 1200-2500g / t of silver, the iron-alumina slag contains 800-1500g / t of silver, the germanium-iron slag contains 500-1000g / t of silver and so on. Today, when resources are increasingly scarce and consumption is increasing, it is of great significance to recover the associated silver in zinc concentrate. [0003] At present, the recovery process of silver in zinc concentrate mainly focuses on the recovery of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B5/10C22B3/04C22B19/00C25C1/18C25C1/20
CPCY02P10/20
Inventor 杨建广邓自祥张绪亮李焌源唐朝波
Owner 德兴市益丰再生有色金属有限责任公司
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