Clean metallurgical method for low-temperature molten salt of antimony

Abstract

The invention discloses a clean metallurgical method for low-temperature molten salt of antimony, and belongs to the metallurgical field of non-ferrous metals. The method is characterized by comprising the following steps of: performing reductive sulfur-fixing melting on antimony concentrate and oxide of metal with higher sulfur affinity compared with the antimony in low-temperature inert molten salt to generate liquid metal antimony and sulfur-fixed metal sulfide, and forming molten salt slag by using the sulfur-fixed metal sulfide and non-reacted substances as solid substances; and separating most inert molten salt from the solid substances and then thermally returning the most inert molten salt to the melting process, regenerating NaHCO3 for recycling by using the molten salt slag through a 'water leaching-carbonated precipitation' process, reclaiming the sulfur-fixed metal sulfide concentrate for selling from the leached residue by ore dressing, or performing roasting desulfuration on the leached residue for heat energy utilization and smoke acid making, and returning oxide roasting sand serving as a sulfur-fixing agent to the melting process. The method greatly reduces the antimony melting temperature, produces the crude antimony at one step, realizes reclamation of sulfur and energy utilization of sulfide, thoroughly eliminates environmental pollution of low-concentration SO2 smoke at the same time of simplifying the flow, reducing the cost and greatly improving the direct yield of the antimony, and has the advantages of low carbon, cleanness and high efficiency.

Description

technical field [0001] The invention relates to a low-temperature molten salt clean metallurgy method for antimony, which belongs to the field of nonferrous metal metallurgy. Background technique [0002] At present, the smelting process for extracting metal antimony from antimony sulfide concentrate is mainly "blast furnace volatilization smelting-reverberatory furnace reduction smelting". As an alternative process of precipitation smelting, this process first presses or pellets the antimony sulfide concentrate, and then puts it into the blast furnace together with coke and flux. Volatilization and smelting is carried out under the system to volatilize and oxidize antimony sulfide, thereby separating it from gangue and other impurities. The generated antimony oxide and flue gas enter the condensation dust collection system for collection, and then undergo reduction and smelting in a reverberatory furnace to produce crude antimony. This process has strong adaptability to ra...

AI Technical Summary

Problems solved by technology

This process has strong adaptability to raw materials and large processing capacity, but generally has defects such as high coke rate, high energy consumption, huge dust collection system, and complicated operations.

Especially in the blast furnace volatilization smelting process to produce low concentration SO 2 Flue gas, which seriously pollutes the ecological environment, is an unresolved technical problem so far

In order to avoid the disadvantages of environmental pollution in pyrochemical antimony smelting process, alkaline wet antimony smelting process has been used at home and abroad, but it has not been popularized and applied due to high production costs; Due to many problems such as antimony explosion, equipment corrosion, and wastewater treatment, the prospects for industrialization are bleak; the "new chlorination-hydrolysis method" that has been industrialized for more than 20 years can produce high-purity antimony oxide, which is still used by a few manufacturers. However, due to the large amount of wastewater discharge, it is difficult to widely promote

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