A kind of production method for preparing ammonium dihydrogen phosphate by-product shallot special fertilizer

Abstract

The invention relates to the field of chemical technique, especially to a production method for preparing ammonium dihydrogen phosphate and a by-product a special fertilizer for chive. By changing coefficients such as temperature and the like of wet-process phosphoric acid preparation of ammonium dihydrogen phosphate, purity of the product ammonium dihydrogen phosphate is raised, and a compound fertilizer containing N, P and K combined forms can simultaneously be produced. By the method, purity of ammonium dihydrogen phosphate can be raised, and the produced special fertilizer for chive has good absorptivity. Meanwhile, the produced special fertilizer for chive can meet nutritional requirements of each period of growth cycle of chive. By the use of the compound fertilizer, yield of chive is raised greatly. The special fertilizer is an efficient compound fertilizer.

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 shallot special fertilizer. Background technique [0002] Ammonium dihydrogen phosphate is widely used in almost all types of crops such as various types of economic crops, grain, melons and fruits, vegetables, etc. It has the effect of overcoming the nutrient deficiency caused by the aging and absorption capacity of the root system in the later stage of crop growth. It is a new type of high-concentration phosphorus and potassium two-element compound fertilizer, and it is an efficient phosphorus and potassium compound fertilizer in agriculture. At present, many domestic fertilizer manufacturers are producing ammonium dihydrogen phosphate compound fertilizer. The production methods mainly include neutralization method, extraction method, ion exchange method, metathesis method, direct method, cryst...

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Problems solved by technology

[0013] The unabsorbed mixed fertilizer is easy to cause soil compaction. At the same time, the release and loss of the mixed fertilizer is too fast, which will cause the crazy growth of shallots in the early stage, and in the later stage, due to the crazy growth of shallots and the soaking of rainwater or the decomposition of fertilizer itself, the nutrients in the soil cannot be obtained. Supply the needs of chives, causing the growth of chives to slow down or stop

[0014] In the process of producing ammonium dihydrogen phosphate from wet-process phosphoric acid, the purity of ammonium dihydrogen phosphate is not high, and the filtrate also contains a large amount of unprecipitated carbonamide, K + 、H 2 PO 4 - 、HPO 4 2- 、PO 4 3- and other substances, the researchers of the present invention have studied the composition content of traditional shallot special fertilizer and the absorption situation of shallot from a large amount of prior art documents and years of exploration and research, and have effectively explored the production of phosphoric acid from wet process. The special fertilizer for chives is produced from the filtrate of ammonium dihydrogen phosphate, which solves the problems of low purity of ammonium dihydrogen phosphate produced by wet process phosphoric acid and unusable active ingredients in the filtrate. At the same time, the special fertilizer has good absorption rate and controlled release Effect, in the domestic fertilizer production, there is no report

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