Patent classifications
C
CHEMISTRY; METALLURGY
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C01
INORGANIC CHEMISTRY
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C01B
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF;; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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C01B25/16
Oxyacids of phosphorus; Salts thereof
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C01B25/32
Phosphates of magnesium, calcium, strontium, or barium
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C01B25/324
Preparation from a reaction solution obtained by acidifying with an acid other than orthophosphoric acid
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C01B25/324

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
20170050848 · 2017-02-23 · ·

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 for obtaining (producing) calcium sulfate, pure phosphoric acid, metal salt solution and/or calcium hydrogen phosphates (e.g. triple superphosphate).