Fertilizer production granulating method

Abstract

The invention discloses a fertilizer production granulating method which comprises the following steps: (a) mixing sulfuric acid and phosphoric acid in a granulating pre-washer to form mixed acid; (b)utilizing a pump to inject the mixed acid into a tubular reactor feeding trough; (c) sending the mixed acid into a tubular reactor through the tubular reactor feeding trough, sending liquid ammoniuminto the tubular reactor through a pipeline connected with the tubular reactor, making the mixed acid and the liquid ammonium react in the tubular reactor and generating slurry through reaction between the mixed acid and the liquid ammonium; (d) sending the slurry into a granulating machine barrel body (5) through a feeding pipe (9) of the tubular reactor and spraying the slurry from top to bottomin the granulating machine barrel body (5) to a material bed through a nozzle (8) on the feeding pipe (9). By means of the fertilizer production granulating method disclosed by the invention, liquidammonium consumption is reduced, and the problems of potential safety hazards, feeding pipe plug and uneven distribution of the slurry in the granulating machine are solved; an effect of reducing coalconsumption and ensuring product moisture meeting a requirement at the same time is achieved; meanwhile, strength, round degree and transparency of product particles are greatly improved.

Description

technical field [0001] The invention relates to a production method of chemical products, in particular to a granulation method for producing chemical fertilizers. Background technique [0002] In the prior art, in one way of granulation, the washing liquid and liquid ammonia are first reacted in the neutralization tank, and the reaction is made into a slurry, and then pumped into the granulator by the slurry pump for granulation. There are many problems in the production method. On the one hand, the ammonia loss during the slurry production in the neutralization tank is large, resulting in a waste of ammonia and a large coal consumption; There are potential safety hazards, such as strong reaction of acid during slurry preparation. If the operation is improper or the liquid level is too high, the slurry can be sprayed out and hurt people, which brings great potential safety hazards. The situation happens from time to time, and the manpower and material resources invested in...

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Problems solved by technology

[0002] In the prior art, in one way of granulation, the washing liquid and liquid ammonia are first reacted in the neutralization tank, and the reaction is made into a slurry, and then pumped into the granulator by the slurry pump for granulation. There are many problems in the production method. On the one hand, the ammonia loss during the slurry production in the neutralization tank is large, resulting in a waste of ammonia and a large coal consumption; There are potential safety hazards, such as strong reaction of acid during slurry preparation. If the operation is improper or the liquid level is too high, the slurry can be sprayed out and hurt people, which brings great potential safety hazards. The situation happens from time to time, and the manpower and material resources invested in the subsequent cleaning process are large and affect the production output of the workshop; the products produced by this method have high moisture content, low particle strength, and stuffy; another way, using Two tubular reactors, the two tubular reactors are set on the same side of the granulator, and each tubular reactor is equipped with two nozzles, in order to realize that all granulation plowshares are sprayed, so each The distance between the two nozzles of the tubular reactor is large, which leads to problems such as nozzle clogging and unstable spraying slurry volume

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