Manufacture of calcium sulphate alphahemihydrate

Details Manufacture of calcium sulphate alphahemihydrate Manufacture of calcium sulphate alphahemihydrate

C - Chemistry, Metallurgy

01

F

23/104

C01F 11/46 (2006.01) C04B 11/00 (2006.01)

Patent

CA 1070926

ABSTRACT OF THE DISCLOSURE A process for the manufacture of calcium sulphate alpha-hemihydrate which comprises the step of interacting an aqueous solution of calcium chloride and a source of sul- phate or bisulphate ions in an aqueous system at a temperature above the calcium sulphate hemihydrate/gypsum transition tem- perature under the reaction conditions. The preferred reagents are the waste calcium chloride/sodium chloride effluent of the ammonia soda process and sulphuric acid (e.g. impure sul- phuric acid effluent) to give hydrochloride acid as a co- product. The preferred reaction temperature is at least 20 degrees centigrade above the transition temperature (about 70°C.), e.g. at 95-100°C. at atmospheric pressure. The product of the invention has particular utility in the manufacture of plaster board, wall blocks or as an inert filler.

226150

Affiliated with

Also associated with

Rating

Manufacture of calcium sulphate alphahemihydrate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Manufacture of calcium sulphate alphahemihydrate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manufacture of calcium sulphate alphahemihydrate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-399028