Determine the formula
Before the fertilizer plant is put into production, the formulation of the NPK fertilizer production process should be determined first. The formulation of fertilizer nutrient can be selected from the existing formulation by referring to the soil nutrient status and crop fertilizer requirement characteristics in the extension area. It can also be designed by itself according to the soil nutrient supply, crop unit fertilizer requirement and the ratio method of nitrogen, phosphorus and potassium nutrients in the sales area.
Determination of organic matter and inorganic fertilizer content
The formulation of compound fertilizer mainly involves the content of organic material and inorganic material. After determining the organic material for fertilizer production, the demand for nutrients of the compound fertilizer can be calculated by subtracting the quantity provided by the organic material. The combination of organic fertilizer and inorganic fertilizer should not only improve the soil and fertilize the land, but also ensure that nutrients can be supplied permanently and adequately to meet the needs of the whole crop growth period.
According to local conditions
For the suitable ratio of organic fertilizer to chemical fertilizer, the ratio of nitrogen, phosphorus and potassium is different in different regions, crops and yield levels. The suitable nutrient proportion of organic fertilizer and inorganic fertilizer N, P and K varies with the different conditions of land, climate, crop and tillage mode. Therefore, fertilizer factories should produce compound fertilizer according to the best proportion of local production conditions, select suitable fertilizer granulator machine. And can not blindly copy foreign experience.
The technological process of NPK fertilizer production process is mainly crushing, batching, mixing, granulation, drying, cooling, screening and packaging. It involves double roller fertilizer granulator, rotary drum granulator, pulverizer, mixer, screening machine and other equipment. After crushing, the decomposed organic fertilizer is mixed with chemical fertilizer according to formula. All raw materials are evenly mixed by mixer. The organic-inorganic compound fertilizer after granulation has high nutrient content and good fertilization quality.