Ammonium polyphosphate agricultural fertilizer granulating technology

Abstract

The invention belongs to the field of fertilizer, and particularly relates to an ammonium polyphosphate agricultural fertilizer granulating technology. The ammonium polyphosphate agricultural fertilizer granulating technology comprises the following steps: adding phosphoric acid into a tubular reactor, introducing ammonia under turbine stirring, and reacting, so as to obtain an ammonium polyphosphate solution; regulating the falling speed of granules in a collecting plate, then spraying the ammonium polyphosphate solution onto the falling granules, carrying out cooling action of reverse airflow in a roller so as to form particulate matters, discharging the particulate matters from the roller, feeding the particulate matters into a rotating cooler and cooling; screening the cooled particulate matters in a screening device, thus finally obtaining the product. The ammonium polyphosphate agricultural fertilizer granulating technology has the characteristics of being low in energy consumption, pollution-free, and easy to operate; the prepared agricultural fertilizer is excellent in granule quality, hard in texture, low in moisture content, and good in granule structure and maintains more polyphosphate content.

Description

technical field [0001] The invention belongs to the field of fertilizers, in particular to an ammonium polyphosphate agricultural fertilizer granulation process. Background technique [0002] With the improvement of industrial production requirements for products, especially the development of the fertilizer industry, people generally require the production of large particle fertilizers (particle size 4-8mm). Large particle fertilizers are suitable for aerial sowing in forests and grasslands due to their large particle size and high strength. Granular urea (with a particle size of 8-12mm) can be used as a deep base fertilizer for paddy fields, and large granular fertilizers are also easy to package, store and transport. [0003] The requirements of modern agriculture for chemical fertilizers are not only quantity, but also good applicability. In order to meet user requirements and obtain better economic benefits, basic fertilizers, such as urea and ammonium phosphate, are g...

AI Technical Summary

Problems solved by technology

[0009] At present, the domestic production of large-grain fertilizers is mainly based on the fluidized bed granulation technology and double-drum granulation technology of Norway Hydro, but the one-time investment and operation costs are high, and the flexibility is poor, and only limited fertilizer varieties can be granulated. , the dust pollution is serious in terms of environmental protection, and the mechanical strength of the particles is relatively poor

Therefore, the existing granulation methods are unsatisfactory in terms of particle mechanical strength, particle size, etc., and there are many problems such as high investment, serious pollution, and complicated operations. Research and development of new granulation processes need to be solved urgently

Images