Long-acting composite fertilizer and preparation method thereof

• Main Authors: WANG JINGANG, RU TIEJUN, WU SHU, GUAN FENGYU, ZHOU JIANBO, HE DONG, WANG JINMING, XIAO ZHANMEI, BEN YANYING, LIANG HONGJIANG, YANG ZHENJUN, GAO YANSONG, LI QIAN, SONG ANXIN
• Format: Patent
• Language: Chinese; English
• Published: 25.01.2019
• Subjects: CHEMISTRY; FERTILISERS; FERTILISERS CHARACTERISED BY THEIR FORM; MANUFACTURE THEREOF; METALLURGY; MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS

The invention discloses a long-acting composite fertilizer and a preparation method thereof, and belongs to the technical field of preparation of chemical fertilizers. The long-acting composite fertilizer comprises the following components in parts by weight: 1.5-30 parts of ammonium polyphosphate, 3-15 parts of liquid ammonia, 5-30 parts of phosphoric acid, 2-20 parts of sulfuric acid, 15-40 parts of ammonium nitrate-phosphorus, 15-40 parts of potassium sulphate, 5-20 parts of monoammonium phosphate, 5-20 parts of ammonium sulfate and 0.5-15 parts of a filler. According to the long-acting composite fertilizer, phosphorus which is in a non-aggregated state is replaced by phosphorus which is in an ammonium polyphosphate state, and meanwhile, nitrogen in a composite fertilizer is replaced byurea-aldehydes condensate; and meanwhile, long action of nitrogen of the composite fertilizer and long action of phosphorus are implemented, and on the other hand, the storage sterilizing property and the anti-caking propert