Production method of readily available and controlled release composite fertilizer containing three nitrogen elements

Abstract

The invention discloses a production method of a readily available and controlled release composite fertilizer containing three nitrogen elements. The production method is as follows: raw materials containing nitric nitrogen, ammonium nitrogen and amido nitrogen are added in materials; in order to prevent that urea reacts with nitro phosphate fertilizer to generate too much urea nitrate and the production can not performed, ammonia gas is introduced in the granulation process according to different proportions to ammonify nitro phosphate fertilizer, reduce the generation of urea nitrate and increase the neutralization degree of monoammonium phosphate; and powdery fundamental fertilizers containing nitrogen, phosphorous and potassium are added to granulate, and then the composite fertilizer can be obtained through drying, cooling, screening and coating. In the production method of the invention, a lot of heat generated in the thermolysis of the nitro phosphate fertilizer and the neutralization heat of the reaction of ammonia gas and monoammonium phosphate are fully utilized to heat materials and increase the granulation temperature; and the viscosity of urea nitrate is utilized, the solubility of ammonium phosphate salt is increased, the quantity of the liquid phase for granulation can be satisfied, higher granulation rate can be realized without using other adhesive, the cost is reduced, the water content of the granulation material is significantly reduced, the drying energy consumption can be reduced and a large amount of energy consumption can be saved.

Description

technical field [0001] The invention relates to a production method of a compound fertilizer, in particular to a production method of adding nitrophosphate fertilizer, urea and chemical raw material ammonia to granulate in an aggregate production process to produce a quick-acting slow-release compound fertilizer containing three types of nitrogen, and the final product Contains available nitrogen, nitrate nitrogen, ammonia nitrogen and slow-release nitrogen, amide nitrogen. Background technique [0002] At present, with the development of modern agriculture, the development of compound fertilizers at home and abroad plays a leading role in the chemical fertilizer industry. In the developed countries of the chemical fertilizer industry, the amount of compound fertilizers has accounted for 70% to 80% of the amount of chemical fertilizers. Compound fertilizers are mainly basic fertilizers containing nitrogen, phosphorus, and potassium, such as urea, ammonium chloride, ammonium ...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned granulation production technology is a production method widely used in my country. The production process of this method is simple and the operation is easy to master. However, there is no chemical reaction between the raw materials in the production process. steam and water, increasing the subsequent drying load, and the product has a low particle strength

The product contains one type of nitrogen (ammonium nitrogen) or two types of nitrogen (ammonium nitrogen and amide nitrogen). The main source of ammonium nitrogen is ammonium chloride, the source of amide nitrogen is urea, and the source of potassium is mostly It is potassium chloride, the content of chloride ion in the product is high, and it is a dichloride product. Long-term application of field crops will cause soil compaction and crop yield reduction, and it is not suitable for economic crops such as vegetables, fruit trees, and tobacco.

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