High concentration compound fertilizer has the advantages of reducing storage cost, packaging cost, transportation cost and use cost. The use of high concentration compound fertilizer can reduce labor and fertilization frequency, so compound fertilizer is more popular in agricultural production. Disc granulator is the basic granulating equipment of NPK compound fertilizer production line. It is suitable for medium and low concentration compound fertilizer granulation and is widely used in fertilizer production. So how can the disc granulator produce high-concentration compound fertilizer with a small amount of investment without changing the current equipment? The simplest way is to change the formula of the disc granulator.
The basic raw materials of urea series compound fertilizers are generally: urea, ammonium chloride, ammonium sulfate, ammonium carbonate, calcium superphosphate, monoammonium phosphate, diammonium phosphate, heavy calcium, potassium chloride, potassium sulfate, etc. Among the above substances, the phosphorus source is viscous substance, and the viscous substance is calcium superphosphate, diammonium phosphate, monoammonium phosphate and heavy calcium. Urea is easy to soften and melt at high temperature. It can bind substances in melting state. It can be regarded as a sticky substance. The rest of basic fertilizers are sandy substances.
In the production of compound fertilizer, more than 40% of viscous substances are easy to granulate, which is commonly for low-concentration compound fertilizer, but relatively difficult for high-concentration compound fertilizer. Therefore, in the production of high concentration compound fertilizer, it is necessary to increase the proportion of viscous substances. The most effective way is to increase the amount of urea in the raw material and choose the additive with strong stickiness to balance the problem that the amount of monoammonium phosphate is small and the stickiness of monoammonium phosphate itself is not strong. A small amount of curing agent such as gypsum should be added to increase the urea ratio, otherwise the material will melt in the dryer.
By adjusting the production formula of disc granulator and optimizing the characteristics of high concentration materials, we can produce high concentration compound fertilizer products that meet the standards.