Production method for preparing ammonium dihydrogen phosphate with special astragalus membranaceus fertilizer as byproduct

Abstract

The invention relates to the technical field of chemical engineering, and particularly relates to a production method for preparing ammonium dihydrogen phosphate with a special astragalus membranaceus fertilizer as a byproduct. Through analysis on requirements on nutritional elements in the astragalus membranaceus growth process, analysis and realization of fertilization conditions of traditional astragalus membranaceus planting, research and discussion of the absorption conditions of crops on nitrogen, phosphorus and potassium, and analysis by combining with the defects in the preparation process of an ammonium dihydrogen phosphate product, a production process of the special fertilizer for astragalus membranaceus is combined with a preparation process of the ammonium dihydrogen phosphate product, so that the preparation process of the ammonium dihydrogen phosphate product and the preparation process of the special fertilizer for the astragalus membranaceus are complementary; production of the special fertilizer for the astragalus membranaceus is carried out by using liquid waste generated in the preparation process of the ammonium dihydrogen phosphate product; the added value of the product in the preparation process of the ammonium dihydrogen phosphate product is increased; the discharge of the liquid waste is lowered; and meanwhile, waste of nitrogen and phosphorus resources also can be avoided by the unnecessary deep crystal ammonium dihydrogen phosphate product in the ammonium dihydrogen phosphate process.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing ammonium dihydrogen phosphate by-product astragalus special fertilizer. Background technique [0002] Astragalus is a leguminous plant, and its root is a well-known nourishing traditional Chinese medicine in my country. Modern pharmacological research shows that Astragalus has the functions of regulating immunity, anti-aging and anti-stress, anti-myocardial ischemia, anti-nephritis, anti-hepatitis and anti-osteoporosis. At present, among the cultivation techniques of Astragalus membranaceus, there are few researches on special fertilizers for Astragalus membranaceus, but fertilizer is the most critical factor for high-yield and high-quality cultivation techniques of Astragalus membranaceus. However, in the prior art, there are few research techniques for special fertilizers for Astragalus, and they are all prepared by mixing traditional ...

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Problems solved by technology

However, in the prior art, there are few research techniques for special fertilizers for Astragalus, and they are all prepared by mixing traditional chemical fertilizers, compound fertilizers and other raw material fertilizers, such as the patent No. CN201010263167. "Fertilizer" is made by mixing astragalus dregs, urea, diammonium phosphate, and potassium sulfate in proportion; another example is "A kind of astragalus yield increasing agent and its preparation method" with the patent number of CN201310583089.4, which uses ammonium sulfate, potassium dihydrogen phosphate , ammonium molybdate, boric acid, sodium citrate, sodium biselenite, etc. are used as raw materials to meet the growth needs of Astragalus. The fertilizer prepared by this method can meet the needs of Astragalus planting and increase the yield of Astragalus. However, if a large amount of this fertilizer is put into the soil for a long time, it will change the soil structure layer and cause compaction. The main reason for the loss of utilization rate is that although this fertilizer can meet the needs of Astragalus crops, it is difficult for Astragalus to absorb a large amount of nitrogen, phosphorus and potassium elements, so that there is still a large amount of nitrogen, phosphorus and potassium elements in the applied fertilizer. It is not completely absorbed, and then remains in the soil, causing soil pollution. Not only that, it will also make the soil eat more and more, thereby increasing the planting cost of growers

[0003] At the same time, the preparation process of ammonium dihydrogen phosphate products is usually produced by wet-process phosphoric acid and hot-process phosphoric acid, but no matter whether it is produced by hot-process phosphoric acid or wet-process phosphoric acid The purity of the ammonium product is affected, so that the purity of the ammonium dihydrogen phosphate product is relatively poor, and it is difficult to meet the industrial needs. Purification of urea phosphate; for this reason, some researchers adopted the method of intermediate replacement, reacting phosphoric acid with urea to prepare the intermediate of urea phosphate, but the reaction was completed below 80°C, and then crystallized by cooling to precipitate phosphoric acid diphosphate ammonium hydrogen phosphate products, and then improve the purity of ammonium dihydrogen phosphate products; however, this process step often requires deep crystallization of ammonium dihydrogen phosphate, thereby minimizing the waste of nitrogen and phosphorus elements in the solution, thereby reducing the concentration of dihydrogen phosphate The cost of ammonium product preparation can also avoid a large amount of waste liquid discharge to cause certain pollution to the environment; and in the process of deep crystallization, it is often accompanied by the production of other products, mixed with ammonium dihydrogen phosphate crystallization, and then affects again Guaranteed the purity of ammonium dihydrogen phosphate product

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