Recovery and Separation of Si and SiC in Wire Cutting Waste Slurry from Photovoltaic Silicon

Abstract

Abstract. The Si and SiC in wire cutting waste slurry from photovoltaic silicon were recovery and separation by froth floatation in this paper, and the lauryl amine and sodium hamates were used as collector and flocculants, respectively. The effects of collector concentration, inhibitor species, and solution temperature and pH value on separation efficiency were investigated. The morphology of collected solid was characterized by SEM.The phase composition of collected solid was characterized by XRD. Laser particle seizer was used to study the particle size distribution. The results showed that temperature had little effect on the flotation efficiency. When pH value was 7, the lauryl amine adapts to neutral environment and the collecting effect of collector was the best, and cellulose was considered to be the best inhibitors in four different inhibitors. When volume fraction of lauryl amine, sodium humate flocculant, cellulose inhibitor, and temperature and pH value were 0.16%, 0.16%, 0.25‰, 30°C and 7, respectively, the solid collecting rate and collected SiC purity were respectively 51.94% and 94.7%.