Granulation of silicone production dust waste for recycling

Abstract

The purpose of the work is to propose a granulation technology for dust waste of metallurgical silicon production for its recycling in the process of ore-thermal reduction of silica. The technology includes the stages of magnetic separation, granulation and drying. Experimental works on iron oxide separation from cyclone dust were performed using a magnetic analyzer of the AMR type (Ukraine). Granulation was carried out using a drum granulator R-020 (Russia). The chemical composition was analyzed with the help of an optical emission spectrometer Varian 730-ES (USA). It has been determined that up to 37% of iron oxide is separated by the method of magnetic separation of silicon production cyclone dust. In the laboratory pelletization in a drum granulator the granules of 10-70 mm in size with the porosity of 40-45% were obtained. The carried out experiments have showed that there is a possibility in principle to use production wastes in the production technology of silicon of metallurgical grades as a pelletized additive to the main (lump) charge. Based on the results obtained, a line for granulating dust waste was proposed.