UTILISATION OF SMALL INDUSTRIAL SOLID WASTE WELDING WORKSHOPS CARBIDE AS A RAW MATERIAL FOR GYPSUM (CASO4) PRODUCTION

In order to increase the effectiveness of clean production program in small carbide welding workshop industry, it is necessary make efforts reduce existence waste produced because pollutes soil, water and air environment. To minimize presence waste, research was carried out by utilizing solid as a raw material for making gypsum (CaSO4) which widely used industrial needs. The implementation reacting with various concentrations H2SO4 solution adjusting reaction time temperature. results initial analysis form Ca(OH)2 slurry contained relatively high levels CaO, namely 71.58%. From that has been done, can be concluded largest conversion value 34.98% obtained using 12N temperature 50oC 40 minutes.