Method for preparing high-purity calcium hydroxide through calcination, cyclone and magnetic separation of carbide slag

The invention aims to provide a method for preparing high-purity calcium hydroxide through calcination, cyclone and magnetic separation of carbide slag, and belongs to the technical field of high-purity calcium hydroxide production.The method comprises the steps that firstly, magnetic substances such as silicon iron in the carbide slag are removed through dry magnetic separation, then carbon and organic matter in the carbide slag are removed through addition of an auxiliary agent for calcination, and calcium hydroxide is obtained; the main component in the carbide slag is converted into loose and porous CaO from Ca (OH) 2; according to the method, impurities such as Al2O3 and a small amount of CaO react with SiO2 through calcination, silicate impurities such as Al2SiO5 and CaSiO3 are generated, most of the impurities and the main component CaO are separated through a cyclone separation method according to the density difference between the substances, pure calcium oxide powder is obtained, CaO reacts with wat