A method for producing a concentrated aqueous solution of mixed ammonium salts of boric, phosphoric and sulfuric acids. (Machine-translation by Google Translate, not legally binding)

摘要

A method for producing a concentrated aqueous solution of the mixed ammonium salts of boric, phosphoric and sulfuric acids, comprising the steps of: (a) adding boric acid to an aqueous solution of a concentration of at least 50% of the salts of ammonium of phosphoric and sulfuric acids, free of phosphoric acid, wherein the weight ratio of the ammonium salt of phosphoric acid to the ammonium salt of sulfuric acid is at least 5 to 1, in a weight ratio of boric acid to the ammonium salt of sulfuric acid of at least 5 to 1; and (b) then adding an amount of ammonia such that at least the largest portion of the ammonium salt of phosphoric acid is diammonium phosphate. (Machine-translation by Google Translate, not legally binding)