The new process of compound (mixed) fertilizer production by ammonia acid method is a new process of compound (mixed) fertilizer production rising in recent years. Compared with the general process of compound fertilizer production, it has the following characteristics:
1. The reaction heat produced by chemical reaction among liquid ammonia, sulfuric acid, monoammonium phosphate and other materials is directly used in NPK fertilizer manufacturing process of ammonia process to raise the temperature of pelletizing materials (which can make the temperature of pelletizing materials reach 70-80 ℃), reduce the moisture content of materials in the process of pelletizing, and thus reduce the dry drying strength. From the actual situation, the process scheme is about 30% – 40% lower than that of ordinary steam pelletizing process Consumption.
2. The NPK fertilizer manufacturing process by ammonia process uses the high viscosity slurry formed by the reaction of sulfuric acid and monoammonium phosphate to granulate. Compared with the general process, the pelletization rate is increased by about 50%. The production capacity of the same production system can be increased by more than 50%. The production capacity of the general 50000 T / a high concentration fertilizer production line can be up to 80000 T / a after adopting the ammonia process.
3. The product of NPK fertilizer manufacturing process by ammonia method has uniform particles, smooth and round appearance, and high particle strength.
4. The adaptability of raw materials is strong, all kinds of raw materials used in the production of general fertilizer can be used in the ammonia process, and the N-P-K nutrient distribution ratio of the product has a large adjustment range. It can produce all kinds of inorganic compound fertilizer with high and low concentration.
The npk fertilizer production line will generally crush the fermentation materials that have completed the secondary aging and stacking process and enter the mixing and mixing system. Before mixing and mixing, according to the formula, N, P, K and other trace elements will be added into the mixing and mixing system to start mixing.
The mixed materials are transported to the granulation system, and the granulation enters the cooling system after passing through the dryer. The materials are screened after reaching the normal temperature. The particles that meet the requirements enter the coating machine to wrap the film and start packaging. The particles that do not meet the requirements are crushed by the pulverizer and then returned to the granulation system to continue granulation.