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Technique for reclaiming smelting refined bismuth from bismuth slag

A technology for bismuth slag and refined bismuth is applied in the field of recycling and smelting refined bismuth, which can solve the problems of waste liquid discharge and pollution, and achieve the effects of reducing energy consumption, strong adaptability of raw materials, and stable production process.

Inactive Publication Date: 2007-12-05
CHENZHOU CITY JINGUI SILVER IND CO LTD
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Problems solved by technology

[0006] Although the above method of smelting bismuth can increase the recovery rate of various valuable metals and improve working conditions, it brings the problem of waste liquid discharge pollution

Method used

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  • Technique for reclaiming smelting refined bismuth from bismuth slag

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Embodiment Construction

[0017] Below in conjunction with the production process flowchart of accompanying drawing, the present invention will be described in detail with specific embodiment:

[0018] Shown in the figure is a kind of technological step of recovering and smelting refined bismuth from bismuth slag as follows:

[0019] a. First mechanically crush the bismuth slag into a powder of more than 40 meshes, add hydrochloric acid to the powder bismuth slag according to the solid-liquid ratio of 3-6:1 for leaching and filtration, and control the leaching temperature at 75-90°C. 3 to 4 hours to obtain leach residue and leachate;

[0020] b. The leached slag produced is sent to the rotary furnace for smelting to recover antimony and precious lead;

[0021] c. The resulting leachate is hydrolyzed to precipitate bismuth, neutralized with caustic soda until the end point is PH=2 to 2.5, kept at a constant pH and stirred for 0.5 hours and then press-filtered to obtain bismuth oxychloride, which is sme...

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Abstract

The present invention is process of recovering and smelting bismuth from bismuth slag, and belongs to the field of combined wet and pyrogenic non-ferrous metal smelting technology. The process includes the first wet leaching of bismuth slag with hydrochloric acid, precipitating leaching liquid to obtain bismuth oxychloride, reducing smelting to obtain coarse bismuth product, refining to obtain refined bismuth product, precipitating Cu from the bismuth extracting filtrate, and returning the used liquid to the leaching step. The present invention has high material adaptability, high metal recovering rate and environment friendship.

Description

technical field [0001] The invention relates to a process for recovering and smelting refined bismuth from bismuth slag, and belongs to the technical field of combined recovery and smelting process of nonferrous metals by wet method and pyroprocess. Background technique [0002] Bismuth is a rare metal with very little stock in nature. Most of it coexists with lead, tungsten and molybdenum deposits, and it has no mining value itself. Industrially, in the process of processing lead anode slime to recover and produce gold and silver, wet process slag (antimony slag, bismuth slag), pyroprocess slag (primary slag, secondary slag), smoke and other by-product materials will be produced. This material mainly contains antimony, bismuth, copper, lead, gold, silver and other valuable metals. Material stacking will pollute the environment, and valuable metals cannot be recovered, and the economic value cannot be reflected. Therefore, the recovery of valuable metals in various slags is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/06C22B1/14C22B3/10C22B3/22C22C30/02C22C13/00C22B3/44C22B15/00
CPCY02P10/20
Inventor 杨跃新蔡练兵陈朴陈直
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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