A production method for preparing special fertilizer for kiwi fruit by-product of tripotassium phosphate

Abstract

The invention relates to the technical field of chemical industry, and in particular relates to a production method for preparing tripotassium phosphate and co-producing a fertilizer special for kiwi fruits. The production method comprises the following steps: according to a fertilizer required by the kiwi fruits, analyzing the effective absorption quantities of nitrogen, phosphorus and potassium elements, and adjusting and collocating the element content in a production technological process to ensure that a prepared combination type compound fertilizer can meet the requirements of the kiwi fruits to a highest extent, the excessive cost caused by improper element collocation in the production of the compound fertilizer can be reduced, and the environmental pollution caused by solidification of the compound fertilizer because excessive elements are fed into soil can be further avoided; the impurity removal cost for preparing a tripotassium phosphate product by using a conventional wet-process phosphoric acid process can be compensated to ensure that the purity of the prepared tripotassium phosphate product can reach more than 95%, and the production cost of the prepared tripotassium phosphate product can be reduced by 93%; and the production method disclosed by the invention has significant economic benefits.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing a special fertilizer for kiwifruit by-product of tripotassium phosphate. Background technique [0002] Kiwi fruit is a large-scale commercially cultivated fruit that was domesticated from wild resources through artificial breeding in the 20th century. It has high nutritional value, high soluble solids content / vitamin C / sugar content and sugar-acid ratio, and has a strong fragrance, Tastes better. However, the growth vigor and stress resistance of kiwifruit trees are weak, and the requirements for cultivation and fertilization management are relatively high, especially for the technical indicators of nutrient resources in the planting process. It is easy to cause the fruit to be small, the growth potential is weak, and the peel is easy to be bruised; the traditional kiwi fruit planting and fertilization adopts simple nitrogen fertilizer...

AI Technical Summary

Problems solved by technology

However, the growth vigor and stress resistance of kiwifruit trees are relatively weak, and the requirements for cultivation and fertilization management are relatively high, especially for the technical indicators of nutrient resources in the planting process. It is easy to cause the fruit to be small, the growth potential is weak, and the peel is easy to be bruised; the traditional kiwi fruit planting and fertilization adopts simple nitrogen fertilizer or organic fertilizer, potassium fertilizer, and phosphorus fertilizer to put into the soil to provide nutrition, but according to reports, for nitrogen, phosphorus, and potassium elements The absorption of nutrients follows the theory of the short board of the wooden barrel. If one of the nutrients is lacking, such as nitrogen, the absorption of phosphorus and potassium will be affected; at the same time, it is also reported that the absorption rate of nitrogen fertilizer by crops is lower than 25%. The absorption rate of phosphate fertilizer is lower than 45%, and the absorption rate of potassium fertilizer is lower than 60%. It can be seen that traditional fertilization, mixing multiple chemical fertilizers or single fertilization into the soil will cause a large amount of nitrogen, phosphorus and potassium residues In the soil, it is not absorbed by crops, which will cause waste of nitrogen, phosphorus and potassium resources and environmental pollution, which has serious ecological problems.

[0003] At the same time, in the preparation process of tripotassium phosphate products, phosphoric acid obtained by wet-process phosphoric acid or hot-process phosphoric acid is usually prepared by reacting with potassium components, which will bring a large amount of impurities to tripotassium phosphate products and affect the quality of tripotassium phosphate ; Therefore, some researchers reacted urea and phosphoric acid to prepare the urea phosphate intermediate, and then used the intermediate to react with the potassium component to prepare the tripotassium phosphate product. In this process, the product was obtained by crystallization, and the solution often needed to be deeply Crystallization can meet the requirement that resources are not wasted, the product output is higher and the discharge of waste liquid is reduced; however, in the process of deep crystallization, the purity of the tripotassium phosphate product will still be poor, because in the process there will be With the precipitation of other products, the purity of the tripotassium phosphate product is lower

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