Sustainable and clean utilization of coal gangue: activation and preparation of silicon fertilizer

Coal gangue, a by-product produced during the coal processing, has serious impact on environment. Using gangue as fertilizer been proven helpful in potentially reducing its environmental and improving value. In this study, formation mechanism influencing factors of coal-gangue-based silicon was studied using XRD FT-IR measurement technologies. The results showed that layered structure severely damaged above 600 ℃, where kaolin began to transform into metakaolin. When CaCO3 alone added, mainly played catalytic role, forming only small amount calcium silicate with available-Si content below 12.60%. corn stalk powder oxides ash participated chemical reaction involving nepheline (K(Na, K)3Al4Si4O16) other silicates 14.56%. CaCO3, were mixed calcined, high 22.97% under synergistic effect powder; concentration toxic metals ions 52.87 mg/kg. prepared can reduce pollution meet agricultural needs China.