The properties of chromium ores from different deposits differ significantly and depend on the amount
of chromite in them, the degree of iron oxidation, the granulometric composition, the ratio between iron and chromium, and the mineral and chemical compositions of the host rock. The study of the structure of chromium ores, the chemical composition and physico-chemical characteristics of the recovery and smelting processes will allow us to fully assess the possibility of using them for the smelting of ferrochrome of different grades. In this paper, the possibility of reducing chromium and iron in the composition of complex oxides by gaseous carbon monoxide and solid carbon is investigated.
Chrome ore concentrates from the Kempirsay and Aganozero deposits, which differ in different ratios of iron and chromium contents, were used as samples. Reducing roasting in the CO atmosphere did not lead to the reduction of chromium and iron in spinelids, with the exception of dust from drying machines, in which, along with particles of Kempirsay chromite, coke particles are present. At the same time, iron and nickel were recovered from the silicates of the host rock.
In the samples, a solid layer of carbides is formed on the surface of the spinelid grains in a mixture with solid
carbon. The formation of a solid shell slows down and stops the recovery process. The continuation of the recovery is possible after the destruction of the shell, which occurs as a result of melting the mixture of carbides and silicides that make up the shell.

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