A kind of production method for preparing special fertilizer for flax by-product of tripotassium phosphate

Abstract

The invention relates to the technical field of chemical industry, and especially relates to a method for preparing tripotassium phosphate and preparing a special fertilizer for flax as a byproduct. The effective absorption amounts of N, P and K elements are analyzed according to fertilizer requirements of flax, and the contents of elements in the production process are adjusted and matched to make the prepared compounded composite fertilizer maximally meet the demands of flax so the too high cost caused by improper matching of the elements in the production of the composite fertilizer is avoided, and environmental pollution caused by solidification of the composite fertilizer due to the addition of excess elements into soil is further avoided; and the molar ratio of raw materials in the production process and the accurate analysis and detection of a filtrate in a crystallization step make the quality of the produced flax composite fertilizer guaranteed, and the adjustment of the contents of components of the filtrate allows a waste liquid in the production process of the chemical industry product to be used as a raw material for producing the composite fertilizer, so the emission of the waste liquid is avoided, the production cost of the composite fertilizer is reduced, and the method has substantial environmental protection values and economic benefits.

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 tripotassium phosphate by-product flax. Background technique [0002] Flax (scientific name: Linum usitatissimum L.): It is an annual herb, which can be divided into three types: flax for fiber, flax for oil and flax for both oil and fiber. Stem erect, up to 1.2m high, upper part soft and waxy; leaves alternate, lanceolate, 20-40mm long, 3mm wide, with glaucous surface; flower petals 5, 15-25mm in diameter, Blue or white; the fruit is a capsule, and the seeds are flat and oval. [0003] According to the type of flax, flax can be used for weaving, that is, fiber; it can also be used for oil, that is, oil production; however, for flax cultivation, the traditional technology is to use farmyard manure, nitrogen fertilizer, phosphorus Fertilization treatment than the formulated fertilizer, even when it is used as wil...

AI Technical Summary

Problems solved by technology

However, this traditional flax fertilizer will bring pollution to the environment, causing a large amount of nitrogen, phosphorus and potassium elements to remain in the soil, resulting in a waste of element resources

[0004] 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 Only 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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