TREATMENT OF SODIUM PHOSPHATE-CONTAINING WASTE FLUID AND RECOVERY OF SODIUM PHOSPHATE

摘要

PURPOSE: To recover sodium phosphate adaptable as an industrial chemical agent by treating a sodium phosphate-containing waste fluid. ;CONSTITUTION: In the recovery of sodium phosphate, a sodium phosphatecontaining waste fluid is adjusted to pH 4 or more and subsequently- cooled to crystallize sodium phosphate to separate a hydrate sodium phosphate crystal. In the treatment of the sodium phosphate-containing waste fluid, a first process adjusting the pH of the sodium phosphate-containing waste fluid to 4 or more and cooling the waste fluid to crystallize sodium phosphate to separate and recover a hydrate sodium phosphate crystal and a second process reacting the separated mother soln. with a calcium source to form a calcium phosphate precipitate to separate and remove the same are executed.;COPYRIGHT: (C)1995,JPO