Recovery of metal phosphates from industrial liquors

Claim 1

A PROCESS FOR RECOVERING A COMPLEX IMPROVED FILTERABILITY FROM AN INDUSTRIAL LIQUOR CONTAINING AN INORGANIC SALT OF THE GROUP CONSISTING OF SULFURIC, HYDROCHLORIC AND NITRIC ACID, AND A METAL CATION OF THE GROUP CONSISTING OF ZINC, IRON, MAGNESIUM, MANGANESE, COBALT AND COPPER, SAID PROCESS COMPRISING CONCURRENTLY ADDING TO THE INDUSTRICAL LIQUOR (A) A SUBSTANTIAL SELECTED FROM THE GROUP CONSISTING OF AMMONIA, A POTASSIUM COMPOUND, A SODIUM COMPOUND AND A LITHIUM COMPOUND, OR MIXTURES THEREOF AND (B) A MATERIAL SELECTED FROM THE GROUP CONSISTING OF (1) AN INORGANIC PHOSPHATE SALT HAVING A CATION SELECTED FROM THE GROUP CONSISTING OF K+,NA+, LI+ AND NH4+, OR MIXTURES THEREOF, AND (2) A SUBSTANCE WHICH FORMS SAID INORGANIC PHOSPHATE SALT, THE AMOUNT OF (B) BEING IN A QUANTITY TO COMBINE WITH THE METLA CATION IN THE INDUSTRIAL LIQUOR, THE AMOUNT OF (A) BEING IN QUANITY IN EXCESS OF THAT REQUIRED TO COMBINE WITH THE SULFURIC, HYDROCHLORIC OR NITRIC ACID IN THE INDUSTRICAL LIQUOR, AND CONTINUING TO ADD (A) UNTIL THE PH OF THE LIQUOR ATTAINS A VALUE OF 6.2 TO 7.2, THUS PRECIPITATING A COMPLEX CHARACTERIZED BY INCLUDING A PHOSPHATE SALT HAVING A CATION OF THE GROUP CONSISTING OF ZINC, IRON, MAGNESIUM, MANGANESE, COBALT AND COPPER OR MIXTURES, THEREOF AND A PHOSPHATE SALT HAVING A CATION OF THE GROUP CONSISTING OF POTASSIUM, SODIUM, LITHIUM AND AMMONIUM OR MIXTURES THEREOF, SAID COMPLEX HAVING AN AMMONIA CONTENT OF FROM 4 TO 8% BY WEIGHT OR HAVING EQUIVALENT WEIGHT CONTENTS OF POTASSIUM, SODIUM AND LITHIUM, WHEREBY THE FILTERABILITY OF THE COMPLEX IS IMPROVED, AND FILTERING SAID LIQUOR IN ORDER TO SEPARATE THE COMPLEX THEREFROM.