Drying-free granulating process of composite fertilizer

Abstract

The invention provides a drying-free granulating process of a composite fertilizer. The granulating process comprises the following process links of preparing raw materials, mixing the raw materials, granulating the raw materials, cooling the granules, collecting dust from the granules, grading the granules, enveloping the finished product with a film, packaging the finished product and the like. The drying-free granulating process is characterized in that the raw materials in the process link of preparing the raw materials include urea, monoammonium phosphate and potassium chloride; and in the process link of granulating the raw materials, a binding agent consisting of a magnesium oxide powder and a phosphoric acid solution is added into a granulator according to a certain proportion. Compared with the prior part, the process for producing the composite fertilizer has the advantages that the process flow is simplified, the production efficiency of the composite fertilizer is improved, the equipment cost is reduced, the energy consumption is reduced, and simultaneously, the environment pollution can also be reduced.

Description

technical field [0001] The invention relates to a compound fertilizer production technology, in particular to a compound fertilizer production technology with an improved granulation process. Background technique [0002] The traditional compound fertilizer production process mainly includes raw material batching, raw material mixing, raw material granulation, granule drying, granule cooling, granule classification, finished product coating, finished product packaging, etc. Among them, steam boiler heating is required in the raw material granulation stage to realize the smooth granulation process of raw materials; in the granule drying stage, the combustion furnace is heated to dry the moisture contained in the granules to increase the strength of the granules and facilitate storage. This makes the traditional compound fertilizer production process consume a lot of energy. At the same time, using the traditional compound fertilizer production process, it is also necessary t...

AI Technical Summary

Problems solved by technology

However, because the supply of liquid ammonia needs to be controlled, the cost of the control device needs to be increased; and the chemical reaction between liquid ammonia and sulfuric acid, monoammonium phosphate and other raw materials is fast, which will make the heat distribution uneven, which will reduce the pelleting rate , the heat generated at the same time will quickly convert liquid ammonia into ammonia gas, which requires the addition of corresponding tail gas treatment devices, making the system complex

Images