Analysis of Technological Issues, Related to Processing of ...
alunite powder, which complies and worsens the technological and economic aspects of the process; 3) passivation of alumina in the roasting and reduction processes; 4) low yield alumina yield in the commercial product (≤ 75%); and 5) a significant amount of solid waste: 5 tonnes of red sludge per 1 tonne of AL2O3, and errors.