Grinshpunt W. Metallurgical properties of Pobuzhye chromites ores and development of efficient modes of obtaining high carbon ferrochrome

The thesis is dedicated to researches of Pobuzhye chromites ores metallurgical properties and de-velopment of efficient modes of obtaining high carbon ferrochrome. It was experimentally shown that there are mineral variety of chromspinellides in chromites ores: (Mg, Fe)•O•Cr2O3 - magnochromite, (Mg, Fe)•O•(Cr, Al)2O3 - chrompicatite, FeO•(Cr, Al)2O3 - alumochromite. It is determined that chrom-spinellides grains cemented by serpentine that compounds 3((MgFe)•O•2SiO2•2H2O or ferrous cementite Fe2Si2O6. The ingredients of waste material in ores are talk Mg3[Si4O10](OH)2, chlorite ((Mg5Al)•(Si3Al)O10(OH)8), magnesite (MgCO3), quartz (SiO2), ferric hydro-oxide (FeOOH). Detrimental impurities content: S-0.02-0.26%, P2O5-0.01-0.04%, that do not exceed allowed tolerance for ferrous ma-tellurgy (S -0.05%, P2O5-0.07%). The influence of the temperature, mode of the charge material prepara-tion, type of chromite concentrate, excess of reducing agent, quartzite additive, sort of carbon reducing agent into kineticsof carbon-thermal reduction of Pobuzhye chromite ores are investigated in the thesis. Recommendations on support the efficient mode of melting process the high-carbone ferrochro-mium are developed and issued that will assist to increase technical-economical rates, which include pre-liminary metallization of chromite ores before its further reduction in electric furnace. Effective scien-tific-based technologies of melting high carbon ferrochromium with using domestic raw material are in-troduced. This allowed to increase productivity of furnaces into 6-9 %, to reduce discharge intensity of electric power into 6-8 % and to improve the process technical-economical rates