Metallic sulfide ore (pyrite, chalcopyrite, galena and sphalerite, etc.) is the sulfuric acid industry and metallurgical industry, an important raw material, flotation concentrate (sulfur concentrate, copper concentrate, nickel concentrate , Molybdenum concentrates and zinc concentrates, etc.) need to be dried in order to enter the subsequent roasting and smelting equipment. In China, with the large-scale pyrite roasting and non-ferrous metal smelting plant construction, the urgent need to improve concentrate drying equipment, a single processing capacity, and requires the implementation of deep drying of concentrates.

Wet sulphide concentrates are generally greyish brown and have a particle size of about 200 mesh (74 m). As the metal content is higher, the bulk density is larger, the wear of the equipment is strong. The flotation method of production of concentrates, the W (H2O) is generally 10% to 15%. When W (H2O) is about 10%, the concentrate is loose; when w (H: O) is higher, the concentrate is relatively sticky. In addition, sulfide in the concentrate during the heating process can easily lead to acid corrosion.

The water content of the concentrate has a significant effect on the smelting operation. In general, smelting requires about 6% to 8% of W (H: O), while others require less. For flash smelting, W (H: O) is lower than 0. 3%. High water content will result in poor fluidity of the concentrate, plug hopper L2], is not conducive to the smelting of non-ferrous metals. In addition, the smelting operation on the drying equipment, dry granularity of the concentrate also has certain requirements.