Process for producing a compound of calcium hydroxide

摘要

A process for producing calcium hydroxide of the following formula (1), which process comprises reacting an aqueous solution of a soluble calcium salt in water with an aqueous solution of an alkali metal hydroxide in the presence of an additive, Ca (OH ) 2-nx (a n-) x (1) (wherein n represents an integer of 1 to 4, x represents a number from 0.001 to 0.2, and An- represents an anion derived from at least one compound selected from group consisting of a compound based on silicon, phosphorus-based compound, a compound based on aluminum, an inorganic acid and an organic acid), wherein the aqueous solution of a soluble calcium salt in water is calcium chloride or nitrate calcium and the aqueous solution of an alkali metal hydroxide is sodium hydroxide or potassium hydroxide and the additive is at least one compound selected from the group consisting of a compound based on silicon, phosphorus-based compound, one compue sto based on aluminum, an inorganic acid and an organic acid, and wherein the additive is present in an amount of 0.01 to 7% by weight based on calcium hydroxide to be produced.