Baboshko D. Physico-chemical and structural phase change during carbothermal processing of titanium magnetite concentrates

Purpose of the work: to develop resource-saving technology of carbothermal processing of coagulated titanomagnetite concentrate of Kropivensky deposit with the receipt of commercial iron-containing and titanium-containing products. Object of research: technology of obtaining of iron-containing and titanium-containing products from titanomagnetite concentrate of ore dressing of the Kropivensky deposit. Subject of research: parameters of carbothermal reduction of coagulated titanomagnetite concentrate.Research methods: microscopic; spectral analysis; structural and textural analysis; X-ray fluorescence analysis; statistical methods for processing research results. The thesis solves the scientific and technical task of developing technology for the processing of titanomagnetite concentrates with TiO2 content up to 25% with the help of a one-stage carbothermal reduction to obtain granulated iron and titanium-containing slag. The order of structural phase changes during the carbothermal reduction of the coagulated concentrate was established, namely: silicate transformation; the recovery of the magnetite portion of the grain with the formation of an ilmenite network; the origin of the titanium phase from the ilmenite network.It was determined that the formation of iron-containing and titanium-containing products with the removal of metallic iron and TiO2 is ensured in a two-step reduction process: I step -temperature 800-1300 ºС; II step – from 1300 ºС to 1500 ºС.It was found that the technological parameters of the process of carbothermal reduction of coagulated titanomagnetite concentrate, which provides 92-96,5 % Fe; 3,4-3,7 % C; 0,5 % V of granulated iron and50-55 %TiO2; 7,4–8,4 % FeO of titaniferous slag.