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Oxidation oven ash hydrometallurgical leaching process

An oxidation furnace and soot technology, applied in the direction of improving process efficiency, etc., can solve the problems of low price of silver content in soot, environmental pollution, secondary environmental pollution, etc., to improve production efficiency and economic benefits, reduce flue gas pollution, The effect of reducing production costs

Inactive Publication Date: 2008-12-24
CHENZHOU CITY JINGUI SILVER IND CO LTD
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Problems solved by technology

The soot is composed of oxides of various metals, including 1.8% silver, 9-12% arsenic, and 30-40% antimony. Due to the high silver content, it is not suitable for direct export (the price of soot containing silver is low. ); direct discharge is neither economical nor pollutes the environment
In order to improve the recovery rate of precious metal silver, all the soot from the current oxidation furnace is returned to the reduction furnace for production, which occupies the feeding space of the reduction furnace and reduces the input of anode slime by about 1 / 4, so that the treatment capacity of anode slime cannot meet the design requirements
Moreover, harmful oxides such as arsenic and antimony returned to the reduction furnace along with the soot will cause secondary pollution to the environment during the reduction smelting process
[0003] Regarding the oxidation furnace soot wet leaching process, there is no relevant report in the relevant literature

Method used

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  • Oxidation oven ash hydrometallurgical leaching process
  • Oxidation oven ash hydrometallurgical leaching process
  • Oxidation oven ash hydrometallurgical leaching process

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Embodiment Construction

[0019] The oxidation furnace soot raw material used in this embodiment is based on the sampling results of the oxidation furnace soot on site by our company:

[0020] Pb 22.30%; Ag 1.8124%; Bi 6.61%; Cu 0.51%; Sb 33.79%; As 9.35%.

[0021] This embodiment adopts the following steps: see attached figure 1

[0022] A. Stir and mix recovered oxidation furnace soot, sodium sulfide solution, and sodium hydroxide solution in a reaction kettle and heat them. After the reaction is completed, filter; Solid weight ratio = 8:1; sodium sulfide solution concentration 300g / L; sodium hydroxide solution concentration 30g / L; reactor control temperature 130°C; reaction time 3 hours;

[0023] B, get the filter residue of step A and return to silver smelting reduction smelting to reclaim lead, silver, copper and bismuth;

[0024] C. Take the filtrate in step A, adjust the remaining temperature of the filtrate to maintain 80°C, feed air into the filtrate, and separate elemental sulfur by filtra...

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Abstract

The invention provides a leaching process of the oxidation oven soot wet method, belonging to the treatment on side products of soot generated in the smelting process technical field. In the process, antimony oxide and arsenic oxide in the oxidation oven soot are simultaneously leached out by the reducing capacity of sodium sulphide first, and generated sodium thioadtimonate and sodium sulfarsenate enter leaching liquid; filter residues are returned for silver smelting reduction smelting; the leaching liquid is passed through air, the sodium thioadtimonate is oxidized into sodium antimonate, free sulfurs in the sodium antimonate are separated by filtering; the mixed filtrate of the sodium antimonate and the sodium sulfarsenate has coarse sodium antimonate crystals extracted by condensed crystallization; and the remained sodium sulfarsenate liquid is taken as waste liquid for reclaiming treatment, so that the effective separation of Pb and Ag and Sb and As is realized. The process of the invention can effectively reduce the quantity of soot returned to the oven for smelting, improving the capability of a reducing furnace for treating anode mud and achieving the double-win aims of improving the efficiency of the reducing furnace and reducing environmental pollution.

Description

technical field [0001] The invention relates to a treatment process for soot by-products produced in the process of smelting silver, bismuth and other precious metal products, in particular to an oxidation furnace soot wet leaching process. Background technique [0002] At present, rare and precious metal products such as silver and bismuth produced by most precious metal smelting enterprises in my country are all extracted and processed from electrolytic lead anode slime by pyrolysis. These processes all produce a large amount of soot, among which the soot produced by the oxidation furnace is called the soot of the oxidation furnace. The soot is composed of oxides of various metals, including 1.8% silver, 9-12% arsenic, and 30-40% antimony. Due to the high silver content, it is not suitable for direct export (the price of soot containing silver is low. ); Direct discharge is neither economical nor pollutes the environment. In order to improve the recovery rate of precious ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B3/12C22B30/00C22B13/00C22B11/00C22B15/00
CPCY02P10/20
Inventor 蔡练兵张圣南陈朴
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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