Study of chlorination of nickel ferrite by gaseous chlorine and calcium chloride in the presence of active additives

Abstract

Thermodynamic analysis and experimental research of the chlorination of nickel ferrite (NiFe2O4) by gaseous chlorine in the presence of added C, BaS, S and NaCl in the temperature range from 300 to 900 degrees C are given in this paper. Nickel ferrite chlorination in the presence of BaS and CaCl2 was carried out in the temperature range from 750 to 950 degrees C. The presence of added C, BaS, S and NaCl intensifies the chlorination process of nickel ferrite by gaseous chlorine and reduces the temperature the reaction begins at from 700 to 300 degrees C. It is concluded that the process of nickel chlorination without additives is chemically controlled, whereas it is diffusion controlled in the presence of additives. The chlorination of nickel ferrite by calcium chloride, i.e., gaseous hydrochloric acid, is intensified in the presence of 7.5 mass % of CaCl2 and 2 mass % of BaS in nickel ferrite, and temperature range from 750 to 950 degrees C. The results obtained in thermodynamic analysis are in good agreement with the experimental ones.