Large-granule nitrogen fertilizer preparation method

Abstract

The invention discloses a large-granule nitrogen fertilizer preparation method. A large-granule nitrogen fertilizer is prepared from ammonium chloride, ammonium sulfate and urea in a certain proportion. The large-granule nitrogen fertilizer preparation method comprises the steps that (a) premixing is performed, namely a certain portion of the raw materials are weighed and are fed into a blender for stirring and premixing; (b) remixing is performed, namely the raw materials subjected to first-time stirring and mixing are conveyed to a disc type blender through a conveying belt and are stirred and mixed again; (c) granulation is performed, namely the completely and evenly mixed raw materials are conveyed to a double-roller squeezing granulator through the conveying belt and undergo squeezing granulation; (d) screening and polishing are performed, namely the raw materials are conveyed to a screening and polishing all-in-one machine through the conveying belt after granulation, and granules are screened and polished to obtain the large-granule nitrogen fertilizer; (e) inspection is performed, namely the large-granule nitrogen fertilizer is sampled for checking and analysis; (f) package is performed, namely the large-granule nitrogen fertilizer is packaged after being inspected. The large-granule nitrogen fertilizer preparation method is simple in process, low in energy consumption, low in cost and free of environmental pollution, and the product does not cake and are convenient to transport and store, long in guarantee period and high in fertilizer efficiency.

Description

technical field [0001] The invention relates to the technical field of agricultural fertilizers, more specifically to a large-grain nitrogen fertilizer, and also to a preparation method of the large-grain nitrogen fertilizer. It is suitable for fertilizer factories to produce large granular nitrogen fertilizer with ammonium chloride as the main nitrogen source. Background technique [0002] Fertilizer is an indispensable and important agricultural material for high and stable crop yields. The production and use of nitrogen fertilizer plays an important role in ensuring national food production and security. However, since the usual chemical nitrogen fertilizers such as urea and ammonium sulfate are easily decomposed into ammonia volatilization and the loss of ammonium nitrogen and nitrate nitrogen after use, the utilization rate of plants using chemical nitrogen fertilizers is very low, only 30%-35%, which not only wastes Valuable fertilizer resources, but also cause seriou...

AI Technical Summary

Problems solved by technology

The problems of the above two methods are complex equipment, high energy consumption and high cost

CN103772035B (2015) discloses a granular nitrogen fertilizer with ammonium bicarbonate as the main nitrogen source and its preparation method. The raw materials include ammonium bicarbonate, urea and binder, wherein the binder is composed of phosphate, magnesium compound, attapulgite powder , methyl silicate, talcum powder and silica gel powder; the preparation process of its granular nitrogen fertilizer is to put ammonium bicarbonate, urea and binder into a disc mixer, stir and mix well, and then use a double-roll extrusion granulator Granular nitrogen fertilizer is obtained after drum sieving; this method has the advantages of simple equipment, low energy consumption and low production cost, but the composition and preparation method of the binder are relatively complicated, and the magnesium compound therein is harmful to alkaline soil. Fertility will have adverse effects and also increase the cost of production

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