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Method for smelting lead anode slime

A technology of lead anode slime and noble lead, which is applied in the field of smelting lead anode slime, can solve the problems of increasing valuable metals, long production cycle, environmental hazards, etc., and achieve the effects of improving recovery rate, reducing cost and simple process

Active Publication Date: 2014-11-19
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the content of arsenic and antimony in lead anode slime at home and abroad is getting higher and higher, and the existing lead anode slime process will produce a large amount of high-arsenic and antimony soot in the production process, which increases the difficulty of comprehensive recovery of valuable metals and affects the environment. cause great harm
In order to reduce environmental pollution, especially arsenic pollution, and comprehensively utilize the high content of antimony in lead anode slime, a variety of lead anode slime smelting processes have been developed, but most of these processes suffer from poor operating environment, serious pollution, long production cycle, and expensive Many problems such as the lack of comprehensive utilization of metals are facing challenges

Method used

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  • Method for smelting lead anode slime

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Effect test

Embodiment 1

[0052] see figure 1 , which is a process flow chart of smelting lead anode slime according to the embodiment of the present invention. As an embodiment of the present invention, the method for smelting lead anode slime includes the following steps.

[0053] 1. Take 3 tons of lead anode slime, smelting temperature is 850 ℃, the volume fraction of oxygen content is 27%, and the flow rate is 1200m 3 / (m 2 ﹒ h) Autothermal smelting under oxygen-rich conditions for 4 hours (that is, the lead anode slime will generate heat by itself to help it smelt under the condition of heating and oxygen circulation, which reduces the smelting requirements), thus destroying the structure of most elements in the lead anode slime, respectively A first aluminum alloy, slag and soot are obtained. Further, the molten slag can be returned to the lead smelting system, and the soot can be returned to the smelting system and blown into the smelting pot together with enriched oxygen.

[0054] Wherein,...

Embodiment 2

[0092] see figure 1 , which is a process flow chart of smelting lead anode slime according to the embodiment of the present invention. As yet another embodiment of the present invention, the method for smelting lead anode slime includes the following steps.

[0093] 1. Take 3 tons of lead anode slime, smelting temperature is 900 ℃, the volume fraction of oxygen content is 30%, and the flow rate is 1300m 3 / (m 2 ﹒ h) Autothermal smelting for 5 hours under oxygen-enriched conditions to obtain the first aluminum alloy, molten slag and soot respectively. Further, the molten slag can be returned to the lead smelting system, and the soot can be returned to the smelting system and blown into the smelting pot together with enriched oxygen.

[0094] Wherein, the dried material composition of the lead anode slime is (by mass fraction): lead: 16.39%, arsenic: 10.62%, antimony: 43.18%, silver: 7.1642%, gold: 127g / t, bismuth: 13.48% .

[0095] 2. Add caustic soda to the first lead al...

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Abstract

The invention discloses a method for smelting lead anode slime. The method comprises the following steps: lead anode slime is smelted in a self-heating way under an oxygen-rich condition, and fully oxidized so that the structure of the lead anode slime is damaged to obtain first lead alloy; the first lead alloy is subjected to alkaline refining under an oxygen-rich condition so that arsenic in the first lead alloy is removed to obtain second lead alloy; the second lead alloy is subjected to converting under an oxygen-rich condition so that antimony in the second lead alloy is removed to obtain rich lead; the rich lead is electrolyzed to obtain silver-lead anode slime, of which the silver content is greater than or equal to 80%; the silver-lead anode slime, of which the silver content is greater than or equal to 80%, is subjected to reduction smelting and electrolysis to obtain high-purity silver, of which the silver content is greater than or equal to 96%. Through the method provided by the invention, the hazardous element arsenic in the lead anode slime is removed and can be pressed into harmless bricks, and high-content antimony in the lead anode slime can generate 96% or more antimony paint in the oxygen-rich moderate-temperature converting process, and then 99.99% high-purity silver is obtained step by step through rich lead electrolysis, reduction smelting and silver electrolysis.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a method for smelting lead anode slime. Background technique [0002] At present, the content of arsenic and antimony in lead anode slime at home and abroad is getting higher and higher, and the existing lead anode slime process will produce a large amount of high-arsenic and antimony soot in the production process, which increases the difficulty of comprehensive recovery of valuable metals and affects the environment. cause great harm. In order to reduce environmental pollution, especially arsenic pollution, and comprehensively utilize the high content of antimony in lead anode slime, a variety of lead anode slime smelting processes have been developed, but most of these processes suffer from poor operating environment, serious pollution, long production cycle, and expensive Many problems such as the lack of comprehensive utilization of metals are facing challenges. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B13/00C22B30/02C25C1/20
CPCY02P10/20
Inventor 覃小龙柴承平谭霖粟明辉
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD