Sulfur's chemical recycle out of hydrometallurgical slag

The sulfur consumption in China is rather high in spite of a small sulfur output. It is highly imperative to recycle sulfur out of hydrometallurgical slag to improve resources ' utilization rate. Physical methods of recycling sulfur have some disadvantages for their high requirements of equipments and raw materials. However, chemical methods can process different raw materials which compensate for the limitations of physical methods to a certain extent. In addition to the common chemical methods, including ammonium sulfide, xylene, kerosene, PCE, there are sodium sulfide -sulfur dioxid, new desulfurizer, like tetrahydronaphthalene, styrene, decahydronaphthalene and toluene. Insoluble sulfur recovery methods also have some research progress. The advantages and disadvantages of the chemical methods are introduced based on discussing their principles.