Abstract:Under the background of the national "carbon peaking and carbon neutrality" policy, lime calcination production is accompanied by a large amount of carbon emissions, which has caused the lime industry to be impacted. The nonferrous metal industry is affected by the lime supply problem because lime is an important pH regulator and effect sulfur depressant. Therefore, it has become a hot research topic for effective substitute of lime, and research low-basicity sulfur depressants. Among the low-basicity sulfur depressants, sulfocompounds can effectively depress sulfide minerals in low-basicity environment, with excellent depression effect. Combining the "chemical reaction hypothesis" and "electrochemical reaction hypothesis", this paper analyzes the floating mechanism of sulfur-bearing minerals, and summarizes the general flotation behavior of sulfur-bearing minerals. According to the "electrochemical reaction hypothesis", sulfocompounds can replace dixanthate oxidation reaction on the surface of sulfur-bearing minerals, to achieve sulfur depression. Then summarizing depressing mechanism and behavior of sulfide, sulfur-oxy species and sulfur oligomers respectively. Finally, based on the above research status, this paper concludes the advantages and disadvantages of sulfocompounds, and points out that the research of polysulfides on sulfur-containing minerals with different oxidation degrees and different crystal structures should be improved. And developing new sulfocompounds structures, researching combined depressants, to take full advantage of the depression of sulfocompounds.