Preparation method for particle compound fertilizer

Abstract

The invention relates to a preparation method for a particle compound fertilizer. The method comprises the following steps of: wetting or heating and mixing a basic fertilizer and a filler to obtain a plastically-enhanced material with high moisture content or high temperature; preparing a mixed material into uniform particles through extruding machinery; rounding the surfaces of particle materials; drying (e.g., the step can be eliminated when the temperature for preparing the particle materials is high); and cooling and sieving to obtain the particle compound fertilizer. Compared with the conventional extruding method, the method has the advantage that: abrasion on extruding equipment is reduced. Compared with the conventional agglomerating method, the method has the advantages that: material returning multiple in a production process can be reduced, and production energy consumption and production cost are lowered. Product particles are uniform, are round in appearance, and have high pressure resistance and agglomeration resistance. In production process, waste emission is reduced, and the field operation environment is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of chemical fertilizer, more precisely, relates to a preparation method of granular compound fertilizer. Background technique [0002] At present, the granulation methods of secondary processing of basic fertilizers to produce granular compound fertilizers generally include extrusion method, pellet method and melt method. [0003] Agglomerate production process is a relatively common compound fertilizer production method at present. The main processing steps of this method are: mixing of raw materials → mixing of raw materials and returned materials → drum or disc granulation → drying → cooling → screening → finished product. Due to the limitations of the granulation method of the agglomeration method, in the screening process, there are usually 1 to 2 times the unqualified particles of the finished product to return to the system. It is easy to be entrained by exhaust gas, difficult to recycle, causing pi...

AI Technical Summary

Problems solved by technology

Due to the limitations of the granulation method of the agglomeration method, in the screening process, there are usually 1 to 2 times the unqualified particles of the finished product to return to the system. It is easy to be entrained by exhaust gas, difficult to recycle, resulting in pipeline blockage, fine powder particles brought into the atmosphere will also cause environmental pollution, and the loss of raw materials will also increase accordingly

[0004] Although the extrusion granulation process has also been promoted in small-scale manufacturers, due to the poor appearance, irregularity and rough surface of the product granules, the market share of the product in the compound fertilizer market is not high, and the extrusion of production equipment High component wear rate, high replacement frequency, high cost and maintenance costs

Images