Production method for preparation of calcium dihydrogen phosphate and by-production of special fertilizer for cauliflowers

Abstract

The invention relates to the technical field of chemical industry and particularly relates to a production method for preparation of calcium dihydrogen phosphate and by-production of a special fertilizer for cauliflowers. According to the production method, by analyzing the fertilizer demand situation of the cauliflowers and combining with the shortcomings in a preparation process of a calcium dihydrogen phosphate product, a preparation process of the calcium dihydrogen phosphate product and a preparation process of the special fertilizer for the cauliflowers are combined for production, so that the added value of the product in the preparation process of the calcium dihydrogen phosphate product is improved, the purity of the calcium dihydrogen phosphate product is improved, the waste of phosphorus and calcium element resources is reduced, the emission of waste liquid is reduced, and the serious pollution of the ecological environment is avoided.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing calcium dihydrogen phosphate by-product cauliflower special fertilizer. Background technique [0002] Cauliflower (scientific name: Brassica oleracea L.var.botrytis L.), also known as cauliflower, cauliflower, cauliflower, cabbage flower, cauliflower, broccoli. It is a cruciferous vegetable, an annual plant, and a variety of cabbage with broccoli and head cabbage. It is a vegetable with low crude fiber content, fresh quality, rich nutrition and delicious flavor, which people like to eat. In the process of cauliflower planting, in order to promote the expansion of curds, high-efficiency nitrogen, phosphorus and potassium compound fertilizers are usually used for application. Generally, the whole process needs to be fertilized 4 times. The first fertilization is usually based on the ratio of nitrogen, phosphorus and potassium fertilizers...

AI Technical Summary

Problems solved by technology

In the process of cauliflower planting, in order to promote the expansion of curds, high-efficiency nitrogen, phosphorus and potassium compound fertilizers are usually used for application. Generally, the whole process needs to be fertilized 4 times. The first fertilization is usually based on the ratio of nitrogen, phosphorus and potassium fertilizers to 1:2-2.4 :2-2.4; the second fertilization is usually carried out according to the ratio of nitrogen, phosphorus and potassium fertilizers of 3:4:1; The ratio of nitrogen, phosphorus and potassium is 5:1:0.8, and at the same time of the third and fourth fertilization, a large amount of trace elements such as borax will be added together for fertilization; however, the ratio of nitrogen, phosphorus and potassium in each fertilization treatment They are all made up of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer according to a certain proportion, so that during the fertilization process, a certain element in the nitrogen, phosphorus and potassium elements will be unbalanced in the preparation, which will lead to the failure to meet the needs of cauliflower. If it is too much, it will remain in the soil, and it will erode with the soil for a long time or have other biochemical reactions, which will increase the cost of fertilizer, and affect the soil structure layer, and seriously damage the ecological environment.

[0003] Simultaneously, in the preparation technology of calcium dihydrogen phosphate product, adopt usually to adopt wet-process phosphoric acid or heat-process phosphoric acid to prepare, its impurity content is bigger, adopt intermediate to replace the preparation of converted calcium dihydrogen phosphate product for this reason, improve The purity of calcium dihydrogen phosphate products, but such a process is to precipitate calcium dihydrogen phosphate products through crystallization. Therefore, in order to increase the output of calcium dihydrogen phosphate products, reduce the waste of calcium phosphorus elements, and reduce the discharge of waste liquid, To reduce the production cost of calcium dihydrogen phosphate products, it is usually hoped that through deep crystallization treatment, a large amount of calcium dihydrogen phosphate products in the solution will be precipitated. However, this process is often accompanied by the precipitation of other products, thereby reducing the cost of calcium dihydrogen phosphate products. Purity makes it difficult for calcium dihydrogen phosphate to meet the standard requirements of food-grade, feed-grade, and even industrial-grade calcium dihydrogen phosphate products

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