Method for producing industrial monoammonium phosphate through fluoride salt purification method

• Main Authors: ZHANG MIN, LIU PENG, YU NANSHU, WEN YIPEI, WANG NA
• Format: Patent
• Language: Chinese; English
• Published: 25.05.2016
• Subjects: CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; COMPOUNDS THEREOF; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention relates to a method for producing industrial monoammonium phosphate through a fluoride salt purification method. Wet process phosphoric acid is used as a raw material, powdered rock phosphate is added for desulfuration, sodium carbonate is added for defluorination, sodium fluosilicate prepared in the defluorination process is added into ammonia water to react, a fluoride salt purifying agent is prepared, after desulfurized and defluorinated phosphoric acid is neutralized with ammonia gas, the prepared fluoride salt purifying agent is added to adjust the pH value, the reaction continues to be conducted after a period of time, filtering is carried out while the mixture is hot to obtain a monoammonium solution, a complexing agent is added to complex microelements, and after complete dissolution, water-soluble monoammonium phosphate is prepared through concentration, crystallization, separation and drying. The fluoride salt purifying agent produced from fluorine in wet process phosphoric acid is use