Limestone Powder is mainly contain Calcium Carbonate (CaCO3). It can be processed into quicklime by burning. Quicklime can be further processed into slaked lime by mixing or slaking with water. Limestone Powder has many applications, including as sulfur remover in thermal power plant, and aLimestone Powder is mainly contain Calcium Carbonate (CaCO3). It can be processed into quicklime by burning. Quicklime can be further processed into slaked lime by mixing or slaking with water. Limestone Powder has many applications, including as sulfur remover in thermal power plant, and as additives in painting materials and papermaking.s additives in painting materials and papermaking.