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Method and device for molten salt electrolysis of materials containing antimony sulfide

A technology of molten salt electrolysis and antimony sulfide, which is applied in the direction of electrolysis components and electrolysis processes, can solve the problems of high energy consumption and complex equipment, and achieve the effects of shortening the reaction time, promoting condensation and sedimentation, and strengthening the mass transfer of molten salt ions.

Active Publication Date: 2020-05-19
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the improvement, the present invention can solve the problems of high energy consumption and complex equipment in the current pyroantimony smelting process, and avoid low-concentration SO 2 pollution, high-grade refined antimony can be refined in one step, the direct recovery rate of antimony can be improved, and the associated sulfur resources in antimony concentrate can be efficiently recovered

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  • Method and device for molten salt electrolysis of materials containing antimony sulfide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The chemical composition of antimony sulfide concentrate A is (%): Sb 51.5, Fe 2.3, S 16.6, As 0.39, Pb 0.42, SiO 2 12.1. Take by weighing 600g of the antimony sulfide concentrate, 120g Na 2 S, 474.6g NaCl and 605.4g KCl. After mixing evenly, spread it on the bottom of the bottom blowing molten salt electrolysis device. Adjust the height of the anode guide rod so that the graphite anode is inserted into the mixed material, and the distance between the cathode and the anode is 4cm. Turn on the power supply of the external resistance heating layer and raise the temperature to 880°C. Blow nitrogen gas with a preheating temperature of 880°C and a pressure of 0.2 MPa from the gas nozzle at the bottom of the electrolytic cell to stir the molten salt, turn on the DC electrolytic power supply, set the cell voltage to a constant voltage of 2.2 V, and finish the reaction after 60 minutes of reaction. After the antimony was discharged from the antimony discharge port, 306g of...

Embodiment 2

[0047] The chemical composition of antimony sulfide concentrate B is (%): Sb 32.1, Fe 16.4, S 30.2, As 1.5, SiO 2 13.5, Pb1.2. Weigh 1200g of the antimony sulfide concentrate B, 600g K 2 S, 1054.8g NaCl and 1345.2g KCl and mix well. After that, the mixed material is spread on the bottom of the bottom-blown molten salt electrolysis device. Adjust the height of the anode guide rod so that the graphite anode is inserted into the upper mixed material, and the distance between the cathode and the anode is 10cm. Turn on the power supply of the external resistance heating layer and raise the temperature to 920°C. Blow argon gas with a preheating temperature of 920°C and a pressure of 0.3 MPa from the gas nozzle at the bottom of the electrolytic cell to stir the molten salt, turn on the DC electrolytic power supply, set the cell voltage to a constant voltage of 2.3V, and finish the reaction after 90 minutes of reaction. After the antimony was discharged from the antimony discharge...

Embodiment 3

[0049] Carry out low-temperature molten salt electrolysis of antimony concentrate with the same raw material and test parameters in the above-mentioned embodiment 1, expand the experimental scale by 10 times, take by weighing 6000g of this antimony sulfide concentrate, 1200g Na 2 S, 4746g NaCl and 6054g KCl. However, parameters such as temperature, pressure, and voltage were not changed. After 120 minutes of reaction, the reaction was terminated. After the antimony was discharged from the antimony discharge port and cooled, 3042g of monolithic antimony was directly collected, the grade of antimony was 98.1%, and the direct antimony recovery rate was 96.6%. The purity of 90.5% S906g was collected in the flue gas collection bag.

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Abstract

The invention discloses a method and device for molten salt electrolysis of materials containing antimony sulfide. The materials containing antimony sulfide and inert molten salt are mixed and put into an electrolysis device for heating electrolysis smelting, inert gas is blown in the smelting process to stir a molten pool, a liquid antimony melt layer is obtained through gradual enrichment on thelower layer in the device along with proceeding of low-temperature molten salt electrolysis, and the elementary substance sulphur is obtained in a smoke collecting device through gradual enrichment.According to the method and the device, molten salt ion mass transfer is enhanced, high-quality antimony and the elementary substance sulphur are produced by one step, and the issue that low-concentration SO2 pollutes the environment in traditional antimony pyrometallurgy is avoided. The method and the device have the advantages of being low in energy consumption, high in antimony direct yield, clean and environmentally friendly. The device is simple and practical, and good antimony and sulphur extractive metallurgy effects can be obtained when the device is used for treating antimony sulfideconcentrate in cooperation.

Description

technical field [0001] The invention relates to a clean metallurgical method and device for obtaining refined antimony and elemental sulfur by electrolysis of molten salt containing antimony sulfide material, belonging to the field of nonferrous metal metallurgy. Background technique [0002] Antimony (Sb) is a silver-white brittle metal that is acid-resistant at room temperature. It is a metal with a wide range of uses, known as "the hero of fire extinguishing and fire prevention", "strategic metal", "metal hardener", "protective agent for fluorescent tubes and electronic tubes". [0003] The existing production methods of metal antimony can be divided into two categories: fire method and wet method. "Blast furnace volatilization smelting-reverberatory furnace reduction smelting" is currently the most important fire antimony smelting process. In this process, antimony sulfide concentrate or antimony-containing materials are pressed or granulated, and then put into the blas...

Claims

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Application Information

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IPC IPC(8): C25C3/34C25C7/06C25B1/00C25B15/00
CPCC25B1/00C25B15/00C25C3/34C25C7/06
Inventor 杨建广南天翔龙伟唐施阳
Owner CENT SOUTH UNIV
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