Production method for preparing ammonium phosphate and coproducing special fertilizer for mulberry

Abstract

The invention relates to the technical field of chemical industry, particularly a production method for preparing ammonium phosphate and coproducing a special fertilizer for mulberry. By analyzing nutrient demand conditions in the mulberry growth process in combination with analysis and understanding of the defects in the ammonium phosphate product preparation technique, the preparation technique of the special combined compound fertilizer for mulberry is combined with the preparation technique of the ammonium phosphate product to perform complementation, thereby lowering the waste liquid discharge amount in the ammonium phosphate product preparation technique, avoiding the defect of lower ammonium phosphate product purity due to deep crystallization, and improving the quality of the ammonium phosphate product. The method enhances the mulberry growth rate, improves the mulberry yield and quality, prevents excessive elements from residing in soil due to improper matching of nutrient elements, lowers the soil hardening rate, enhances the land utilization ratio, and has obvious environmental protection value and economic benefit.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing ammonium phosphate by-product special fertilizer for mulberry trees. Background technique [0002] Mulberry silkworm is a traditional industry in my country's rural areas. It is divided into two categories, one is mulberry planting, and the other is sericulture. The quantity and quality of leaves produced by mulberry trees will directly affect the quantity and quality of silkworm rearing. In the traditional mulberry garden management, no fertilizer or farm manure and a small amount of simple fertilizer are applied, which makes it difficult for the quantity and quality of mulberry leaves to meet the needs of silkworm rearing. Studies have shown that if there is too much nitrogen, the mulberry leaves will be soft, which is a bad mulberry; when the phosphorus and potassium are insufficient, the quality of the mulberry leaves will be poore...

AI Technical Summary

Problems solved by technology

In traditional mulberry orchard management, no fertilizer or farmyard manure and a small amount of simple fertilizer are applied, which makes it difficult to meet the needs of silkworm rearing in both the quantity and quality of mulberry leaves

Studies have shown that if there is too much nitrogen, the mulberry leaves will be soft, which is a bad mulberry; when the phosphorus and potassium are insufficient, the quality of the mulberry leaves will be poorer, and the ingredients and sugar content in the mulberry leaves will be lower, especially The abnormal accumulation of free arginine leads to the death of silkworms. The lack of potassium will affect the photosynthesis of mulberry trees and reduce the disease resistance. According to the theory of short boards of wooden barrels, when a certain element is deficient, it will cause crops to produce Deficiency disease, which affects the quality and yield of mulberry leaves

And, it is reported that the absorption of nitrogen, phosphorus and potassium fertilizers by crops is also relatively low. Generally, the absorption of nitrogen fertilizer is about 20-46%, the absorption rate of phosphorus fertilizer is 10-25%, and the absorption rate of potassium fertilizer is about 46-60%. It can be seen that the absorption rate of nitrogen, phosphorus and potassium fertilizers by crops is low, and a large amount of nitrogen, phosphorus and potassium fertilizers will remain in the soil. Over time, the salt content in the soil is higher, and then there is compaction, reducing soil quality and pollution. Environment will also cause the planting cost of mulberry planters to be relatively large; although, at present, some researchers study the fertilizers for mulberry trees for the above-mentioned part of the situation and the demand for nutrient elements of mulberry trees, such as the patent No. CN201110107909. Fertilizer", CN201210452364.4 "Mulberry fertilizer containing modified water-soluble nano-scale silica sol and its preparation method", CN201210452368.2 "Mulberry fertilizer containing modified attapulgite and its preparation method", CN201210452399.8 "A Zirconia-Loaded Mulberry Fertilizer and Its Preparation Method", CN201210452465.1 "A Mulberry Fertilizer Containing Modified Nanoscale Titanium Dioxide and Its Preparation Method", CN201210454918.4 "A Mulberry Fertilizer Containing Modified Patent documents such as "Mulberry fertilizer and its preparation method of styrene-acrylic emulsion", CN201310707047.7 "A kind of mulberry compound fertilizer and its preparation method" and other patent documents have all studied the special fertilizer for mulberry, but they all adopt the existing technology Existing chemical fertilizers or compound fertilizers are mixed with farmyard manure to add trace element compounds. Although such fertilizers can meet the nutrient requirements of mulberry trees, they have little effect on the yield and quality of mulberry leaves. Large, and because of the improper combination of nitrogen, phosphorus and potassium elements, there will be more salt remaining in the soil, and the degree of soil pollution will be greater

[0003] At the same time, in the preparation process of ammonium phosphate products, one of wet-process phosphoric acid and hot-process phosphoric acid is usually used to prepare ammonium phosphate products. This process will affect the purity of ammonium phosphate products, making ammonium phosphate The purity of the product is low. Therefore, it is necessary to design an additional purification process for ammonium phosphate to purify the ammonium phosphate product, thereby increasing the preparation cost of the ammonium phosphate product. Therefore, some people react by using phosphoric acid and urea at a temperature lower than 80 degrees Celsius. To produce an intermediate such as urea phosphate, and then use the intermediate as a raw material to react with ammonia gas to produce ammonium phosphate products. This process requires cooling and cyclic crystallization of ammonium phosphate products, but often requires deep crystallization of ammonium phosphate products. Only in this way can a large amount of nitrogen and phosphorus nutrients in the waste liquid be discharged into the environment, thereby avoiding the waste of resources and reducing the production cost of ammonium phosphate products. However, due to the deep crystallization process, other products will also be crystallized out. , thereby affecting the purity of the ammonium phosphate product

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