Experimental Study On Recovery Of Iron Resources By Sulfide - Magnetization Roasting In

Tin-bearing iron ore is typical complex hard-processing iron ore resources, which mainly distributed in the province of Inner Mongolia, Hunan, Guangxi, Yunnan, etc, and gross reserves are huge. It is hard to achieve qualified iron concentrates with the method of routine beneficiating method, because of the fine disseminated grain and complex accompany relations. In order to implement the effective utilization of tin-bearing iron ore early, the study explores to deal with tin-bearing iron ore by sulfidation-magnetic roasting. Based on accomplishing the efficient removal of tin, it accomplishes the enrichment of iron resources.Tin contained as high as0.35%, and it must be pretreated to remove tin if applied. Fe-Sn-S sulfur advantage area map was established, and research shows that, the main volatilization phases of tin are SnS and SnO, and the volatilization of Sn and SnO2are relatively small. The sulfurication reacting tendency of SnO was larger than SnO2and Sn with the same reaction conditions. Roasting reaction is coupled, and C-O-Fe-Sn advantage range chart is established. Fe2O3and SnO2selective reduction into SnO and Fe3O4respectively at the same time are achieved, under the CO concentration between0.13%～11.43%, and temperature higher than873K, which is conducive to the follow-up of vulcanization reaction of tin and the iron enrichment of magnetization.Experimental research of sulfide-magnetization roasting was studied, and the result showed that,the main volatilization phases of tin was SnS in a weak reduction sulfide atmosphere. When roasting temperature was1473K, the roasting time was60min, pyrite ratio was5%, the ratio of anthracite coal was5%, nitrogen flow was15L/h, tin removal rate was85.71%, material residues tin content was0.05%after roasting. The main iron phase was changed after roasting, which transformed from antiferromagnetic Fe2O3into ferrous magnetic Fe3O4. Under tin optimization technology condition and the magnetic field strength of110kA/m product for roasting magnetic separation, it could obtain an iron grade of iron concentrate63.04%and recovery rate63.04%. This process can be better achieved to the purpose of tin removal and iron enrichment of magnetization.