METHOD FOR PURIFYING RAW PHOSPHORIC ACID (E.G. MGA ACID) BY ADDING ASHES ORIGINATING FROM WASTE INCINERATION PLANTS, COMPRISING THE PRODUCTION OF PURE PHOSPHORIC ACID, CALCIUM SULFATE, WATER-SOLUBLE CALCIUM HYDROGEN PHOSPHATES AND METAL SALT SOLUTION

摘要

The present invention relates to a method for purifying raw phosphoric acid by adding ashes originating from waste incineration plants, as well as calcium hydroxide and at least one sulfide, and by wet-chemical digestion to obtain (produce) calcium sulfate, pure phosphoric acid, metal salt solution and/or calcium hydrogen phosphates (e.g. triple superphosphate).