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.