With the development of environmental protection and organic agriculture, the production of organic fertilizer from organic waste by biological fermentation has been developed rapidly, which makes the treatment of organic waste harmless and resource-based.
However, the organic hypertrophy obtained by biological fermentation is mostly coarse powder or irregular small pieces, which is not convenient for use, especially for large area machine seeding. The key to solve the problem of organic hypertrophy area popularization and application is to make the coarse powder or irregular small pieces of organic fertilizer produced by biological fermentation into spherical granular organic fertilizer.
- Using traditional disc or drum granulation, coarse powder or irregular small pieces of organic fertilizer need to be dried (moisture < 15%) and crushed into very fine (more than 100 mesh) powder, and then binder and inorganic fertilizer are added, and the amount of binder and inorganic fertilizer in organic fertilizer can not be more than 30%.
- Firstly, the coarse powder or irregular small pieces of organic fertilizer are dried until the moisture content is only 20-25%, and then the dried organic fertilizer is extruded into columnar or flat spherical particles by flat die extrusion granulator or double roll extrusion granulator.
- The coarse powder or irregular small pieces of organic fertilizer are first extruded into short columnar particles (due to high moisture content and high fiber content, the columnar particles also have certain plasticity), and then polished and shaped into spherical particles. Then the spherical particles are dried, cooled and screened to obtain qualified particles. In this method, raw materials do not need to be treated, and the moisture sequence is reduced step by step, The production cost is greatly reduced.
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