A lime calcium oxide as the main component of air rigid inorganic cementitious materials. Lime is limestone, dolomite, chalk, calcium carbonate shells and other products with high content of industrial lime, after 900 ~ 1100 ℃ calcination. Lime related impacts: work should pay attention to protect the respiratory organs of Hebei lime, dust fibers dressed with clothes, gloves, glasses and dust sealed much money one ton of industrial lime and coated greasy ointment Henan quicklime to prevent dust inhalation. Calcium oxide hazardous characteristics: with acids can react violently. With strong corrosive. Calcium oxide with a strong water absorption and hydration timely release large amounts of heat to form calcium hydroxide; lime calcining time and get quicklime. Calcium oxide Solubility: insoluble in alcohol, soluble in acid, glycerol.