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Vacuum distillation process for extracting silver from silver zinc slag

A technology of distillation extraction and silver-zinc slag, which is applied in the field of metal smelting, can solve the problems of long extraction process, loss of recovery rate, environmental pollution, etc., and achieve the effect of simple process, low cost and high recovery rate

Inactive Publication Date: 2011-08-24
赵志强 +2
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AI Technical Summary

Problems solved by technology

During the production process, part of the zinc enters the flue dust of crude lead smelting, bismuth and silver enter the anode slime of crude lead electrolytic refining, resulting in the loss of recovery rate of silver, bismuth and zinc, long extraction process, high energy consumption and environmental pollution

Method used

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  • Vacuum distillation process for extracting silver from silver zinc slag
  • Vacuum distillation process for extracting silver from silver zinc slag

Examples

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Embodiment Construction

[0011] Taking 1000kg of silver-zinc slag as raw material to extract pure silver as an example:

[0012] 1. Put 1000kg of silver-zinc slag in a vacuum distillation furnace, add 50kg of reducing agent coal, and carry out reduction smelting at a temperature of 1000°C to 1200°C to obtain a silver-zinc-bismuth alloy.

[0013] 2. The silver-zinc-bismuth alloy obtained above is vacuum distilled in a vacuum distillation furnace under a vacuum state of 20 to 100 Pa to produce 50 kg of silver alloy with a silver content of more than 98% and 950 kg of zinc-bismuth alloy.

[0014] 3. Refining the silver alloy produced above to obtain 49 kg of pure silver.

[0015] 4. The zinc-bismuth alloy produced by vacuum distillation is directly used in the process of bismuth refining, adding zinc and removing silver, and the produced bismuth-silver-zinc slag is returned for reduction smelting and vacuum distillation.

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Abstract

The invention relates to a vacuum distillation process for extracting silver from silver zinc slag, characterized by comprising the process flow of reduction smelting, vacuum distillation, extraction of gold and silver and bismuth refining for desilverization. The invention has the advantages of simple process, little equipment investment, no loss of silver, zinc, bismuth and led, high recovery rate of rare valuable metals, low cost, no pollution of the extracting process, and provides a new smelting process for the silver zinc slag.

Description

technical field [0001] The invention relates to a metal smelting method, in particular to a process for extracting silver by vacuum distillation of silver-zinc slag. Background technique [0002] Silver-zinc slag will be produced in the silver removal process of crude bismuth and crude lead pyro-refining process, which contains 1%-8% silver, 70%-85% bismuth or lead, and 10%-15% zinc . At present, the conventional process for recovering precious metals from silver-zinc slag is to first return the silver-zinc slag to crude lead, and then carry out reduction smelting. During the production process, part of the zinc enters the flue dust of crude lead smelting, and bismuth and silver enter the anode slime of crude lead electrolytic refining, resulting in the loss of recovery rate of silver, bismuth and zinc, long extraction process, high energy consumption and environmental pollution. Contents of the invention [0003] The purpose of the present invention is to overcome the d...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B5/16C22B11/00C22B13/00C22B19/04C22B30/06
CPCY02P10/20
Inventor 赵志强蒋丽华关亚君
Owner 赵志强
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