Compound fertilizer containing three forms of nitrogen and preparation method thereof

• Main Authors: JIANG NINGNING, LIU HONG, HUANG MINGCAI, TIAN JUN, FENG XUENING
• Format: Patent
• Language: Chinese; English
• Published: 14.04.2023
• 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 compound fertilizer containing three forms of nitrogen and a preparation method thereof. The compound fertilizer comprises the following raw materials in parts by weight: 5-20 parts of urea, 10-30 parts of ammonium sulfate, 10-30 parts of monoammonium phosphate, 8-22 parts of potassium sulfate, 1-10 parts of soil powder, 1-10 parts of aluminum sulfate, 1-10 parts of polyacrylamide, 5-30 parts of ammonium nitrate phosphorus and 1-5 parts of water. The preparation method comprises the following steps: weighing the raw materials according to the formula ratio, uniformly mixing and stirring to obtain a mixture, conveying the mixture into a double-roller extrusion granulator for granulation, and screening and drying the granules to obtain a finished product, namely the compound fertilizer containing three forms of nitrogen, so that direct contact mixing of urea nitrogen and nitrate nitrogen is realized; the problem of mixed moisture absorption of urea nitrogen and nitrate nitrogen is fund