Abstract:The recovery rate of fine granulated cassiterite materials in a tin ore re-selection process is low. In order to improve the comprehensive recovery rate of cassiterite, the flotation desulphurization and desulphurization process of fine grained material spiral chute tailings was carried out with the new collector SH. The results show that the sulfur grade of 25.31 % and the recovery rate of 96.06 % of the sulfur concentrate can be obtained by treating the fine cassiterite material containing 3.8 % sulfur and 0.4 % tin. After desulphurization, the tailings are activated with a thick and two fine tin stone activation closed-circuit process, which can obtain a tin grade of 7.735 % and a tin recovery rate of 86.62 %. Compared with the traditional sulfuric acid + yellow medicine for sulfur removal, the new collector SH has dehumidification, desulfurization, no need to add sulfuric acid as an activator of pyrite, and low ore dressing costs, reducing the use of sulfuric acid. Safety risks and occupational health hazards.