Synthesis of Fibrous Gypsum from By-Product Gypsum fo Phosphoric Acid Process

,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 27(5); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(5): 577.

인산 석고로부터 섬유상 반수석고의 생성

배동식, 이구종¹, 최상흘

한양대학교 무기재료공학과
¹국립공업시험원 요업과

Synthesis of Fibrous Gypsum from By-Product Gypsum fo Phosphoric Acid Process

ABSTRACT

The synthesis conditions of fibrous calcium sulfate hemihydrate were investigated by using phosphogypsum and calcium sulfate hemihydrate. The unstable organogel was deposited by adding methanol to the saturated solution with gypsum at ageing temperature, and it was crystallized to fibrous gypsum hemihydrate while methanol was removed by rapid filtrating. In case of using calcium sulfate hemihydrate, fibrous $beta$-calcium sulfate hemihydrate was formed by adding methanol of 67% to saturated solution at 6$0^{circ}C$ and ageing for 5 minutes and filtering with suction. Minor components in phosphogypsum did not affect the reaction.