THEORETICAL AND APPLIED ASPECTS OF CHARGE PREPARATION TO SMELT SILICON

There the study object is the electrothermal production of silicon. The study purpose is to evolve the theoretical knowledges about the processes of carbothermal reduction of silicon from the silica, which run with the assistance of fine-dispersed reactants, as well as about the interconnection of process variables of reduction smelting of silicon with the morphological distinctions of diverse types of raw material. The methodology of physicochemical simulation of equilibrium state of Si-O-C thermodynamical system with regard to the structural imperfections and to the evolved surface of solid phases compounding it has been developed. The prediction methodology of manufacturing fitness of ore raw material to smelt the silicon has been developed. The opportunity to raise the rate of electrosmelting of silicon by the use of lump charge compositions incorporating the fine-dispersed reactants as well as by the use of ore raw material, which provides for the minimal gasification rate of silica in the low-temperature and medium-temperature zones of furnace, has been substantiated. The industrial tests of electrosmelting process with the use of new type of ore raw material have been executed. The charging manner of furnace top has been brought in. The silicon extraction has been risen by 6%, the output of electrosmelting has been risen by 92 kg/h, the consumption of electric energy has been decreased by 2,5 ths kWxh/tAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio