Production method for preparing tripotassium phosphate and by-producing special fertilizer for litchi

Abstract

The invention relates to the technical field of chemical industry, and particularly relates to a production method for preparing tripotassium phosphate and by-producing a special fertilizer for litchi. According to the production method, the effective absorption amount of nitrogen, phosphorus and potassium elements is analyzed according to the fertilizer requirement of litchi, and element content is regulated and collocated in a production process course, so that a prepared compounded-form compound fertilizer can furthest meet the requirement of the litchi, excessively high cost caused due to improper element collocation in the production of the compound fertilizer is reduced, and environmental pollution caused by that the compound fertilizer is solidified by adding excessive elements to soil is further prevented; and the impurity removal cost needed when a tripotassium phosphate product is prepared by adopting the traditional wet-process phosphoric acid method is made up, so that the purity of the prepared tripotassium phosphate product reaches more than 95%, the production cost is reduced by 93%, and outstanding economic benefit is achieved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing special fertilizer for litchi by-product of tripotassium phosphate. Background technique [0002] Although litchi is a long-lived fruit tree, it is a kind of fruit tree. In its traditional planting technology, the fertilizer requirements of litchi are divided into different ages such as juvenile, mature and old, and different nitrogen and phosphorus are applied according to the different ages of litchi trees. Potassium fertilizers are usually made of heavy superphosphate, potassium dihydrogen phosphate, urea, etc. as raw materials according to a certain amount of ratio to meet the growth needs of litchi, and in the process of preparation, some urine, poultry, etc. will also be added. Manure is added as an additive, but for this traditional compound fertilizer applied to the soil, the amount that can only be absorbed is about 15-20% of n...

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Problems solved by technology

[0003] Moreover, in the preparation process of tripotassium phosphate products, the product is usually obtained by crystallization after the reaction of phosphoric acid and potassium components, but often in order to reduce the waste of raw materials and increase the output of the product, the reaction solution will be deeply crystallized, thereby making the solution Phosphorus and potassium elements are separated out in the form of tripotassium phosphate, but this deep crystallization tends to precipitate other impurity products. There are many impurities, so some researchers use urea phosphate as an intermediate to convert and prepare tripotassium phosphate products, but such conversion still cannot avoid the impurity problem caused by deep crystallization, but only phosphoric acid products prepared by wet-process phosphoric acid However, the purity of the tripotassium phosphate product is still poor at the same time as the deep crystallization, because it will also be accompanied by the precipitation of other phosphate products, resulting in tripotassium phosphate The purity of the product is poor

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