Process for the production of reactive calcium hydroxides for purification of gas and exhaust gas

摘要

In the production of Ca(OH)2 from burnt lime (CaO) by slaking, to improve the properties of calcium hydroxide, salts, inter alia, are added to the slaking water. Chlorides and nitrates accelerate the slaking process, for example, sulphates, hydroxides, phosphates and carbonates prolong it. According to the invention, to prevent excessively short and excessively long slaking times, accelerating and prolonging salts are used in combination. For example, the accelerating action of iron(III) chloride can be removed again with iron(III) sulphate.