Continuous enveloping fluidized bed for slow/control-release fertilizers

Abstract

The invention relates to a continuous enveloping fluidized bed for slow / control-release fertilizers. The continuous enveloping fluidized bed is used for enveloping granulated fertilizers for preparing the slow / control-release fertilizers. A horizontal bed body is composed of a plurality of parallel fluidizing chambers and a discharging cabin and is characterized in that an air inlet pipe, an air chamber, a suspension clapboard and an air outlet pipe are independently arranged in each of the fluidizing chambers; besides, only the fluidizing chamber, on which a feeding port is located, is free from an air outlet pipe; the granulated fertilizers are preheated in a preheating section in turn; liquid enveloping materials are repeatedly and alternately sprayed in an enveloping section; and the fertilizers are discharged from the discharging cabin after the fertilizers are fully dried and solidified in a drying section. The continuous enveloping fluidized bed for slow / control-release fertilizers has the advantages of capability of realizing continuous feeding and discharging, integrated function of preheating, enveloping and drying, simple technology, high production efficiency, low energy consumption, excellent operating environment, high safety, enveloping uniformity, suitability for various enveloping materials, and capability of realizing multi-times / layer enveloping of same or different enveloping materials.

Description

technical field [0001] The invention relates to a continuous film-coated fluidized bed for slow / controlled release fertilizers, in particular to a fluidized bed device capable of realizing large-scale continuous film-coated production of slow / controlled release fertilizers. Background technique [0002] At present, there are mainly three kinds of equipment in the production technology of slow / controlled release fertilizer coating at home and abroad: disc coating machine, coating drum (drum) and coating fluidized bed (or spouted bed). The first type of coating equipment is mainly suitable for wrapped (or coated) slow-release fertilizers manufactured using inorganic mineral powder cementation technology, but due to the poor slow-release effect and low nutrient content of this type of slow-release fertilizer Meet the requirements of coated slow / controlled release fertilizers, so this type of equipment has not attracted the attention of the majority of slow / controlled release fe...

AI Technical Summary

Problems solved by technology

The first type of coating equipment is mainly suitable for wrapped (or coated) slow-release fertilizers manufactured using inorganic mineral powder cementation technology, but due to the poor slow-release effect and low nutrient content of this type of slow-release fertilizer Meet the requirements of coated slow / controlled release fertilizers, so this type of equipment has not attracted the attention of the majority of slow / controlled release fertilizer manufacturers

The second type of coating equipment is most commonly used for the production of sulfur-coated urea. This equipment is not favored due to the poor slow-release effect of sulfur-coated urea and the acidification of the soil due to long-term use.

However, according to relevant information, this type of equipment is relatively complicated, and its coating technology needs to be further optimized and perfected in actual industrial production, and the process still needs to be simplified.

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