COMPUTER THERMODYNAMIC MODELING OF FERROALLOY EXTRACTION FROM NON-CONDITIONED BAUXITES OF THE AYUSAI FIELD

Abstract

The results of studies of ferroalloy production from Kazakh bauxites of the Ayusay deposit presented in the article. In the process of thermodynamic modeling study the HSC-6.0 Chemistry software package based on the principle of minimization of Gibbs energy was used. Formation of ferrosilicon of the FeSi25 brand is observed in the temperature range of 1700 - 1800⁰C and the amount of iron of 26%, 36%. Ferrosilicon of the FeSi25 brand is formed at temperatures of 1700-1800⁰C and the content of 26% iron in the charge, while the concentration of metals in the alloy is 26.2-27.9% Si, 0.2-1.4% Al. It was found that at the content of 36% iron and 1700-1800⁰C the grade ferrosilicon (FeSi25) is formed, with the concentration in the alloy of silicon from 22.3 to 23.7%; aluminum from 0.2 to 1.1%. It has been established that with an increase in the amount of iron in the batch of 16 - 36%, the degree of transition of silicon and aluminum into the ferroalloy increases, so Si up to 93.7%, and Al up to 47.3%. Based on the material balance from 100 kg of bauxite, it is possible to obtain 61.2 kg of grade ferrosilicon.