Method of production of monoammonium phosphate, purified

摘要

The invention relates to a process for producing monoammonium phosphate purified from phosphoric acid obtained by wet and ammonia. / p & & p & the ammoniation takes place in two steps. The acid is ammoniated in the first step has a ph of 1,5 has 2,5 about. This mixture is brought to aging, after which it is ammoniated a ph of 4 to 5 approximately. A precipitate containing impurities is formed during the first and second steps of ammoniation and is easily filterable of the solution of monoammonium phosphate from the second step of ammoniation.