Producing method for preparing ammonium dihydrogen phosphate byproduct as special fertilizer for white gourd

Abstract

The invention relates to the technical field of chemical engineering, and particularly relates to a production method for preparing an ammonium dihydrogen phosphate byproduct as a special fertilizer for white gourd. Through changing the coefficients such as temperature and the like during the preparation of the ammonium dihydrogen phosphate via wet process phosphoric acid, the purity of the ammonium dihydrogen phosphate product can be improved and a compound fertilizer containing N, P and K combined states can be produced at the same time; through the production method, the purity of the ammonium dihydrogen phosphate can be improved and the produced fertilizer for white gourd is good in absorptivity; and meanwhile, formaldehyde is added into the filter liquor to prepare a controlled release compound fertilizer, so that the produced fertilizer for white gourd is capable of satisfying the nutrient requirements of all stages in the growth period, the yield of the white gourd is greatly increased and the compound fertilizer is efficient.

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 winter melon special fertilizer. Background technique [0002] Wax gourd is the fruit of the Cucurbitaceae herbaceous plant Wax gourd. It is shaped like a pillow and is native to China. It is a common food on the table of ordinary people in summer. Winter melon has been cultivated and eaten by people very early. In "Shen Nong's Materia Medica", there is a record about wax gourd, which is called "Shuizhi". It is cultivated all over our country, and it is picked when the fruit is ripe in late summer and early autumn. Sweet and light in taste, slightly cold in nature. This product contains protein, sugar, carotene, multivitamins, crude fiber, calcium, phosphorus and iron, and has high potassium salt content and low sodium salt content. Clearing away heat and detoxification, diuresis and elimina...

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Problems solved by technology

[0012] 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, 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 wax gourd special fertilizer and the absorption of wax gourd from a large number of prior art documents and years of exploration and research, and have effectively explored the production of phosphoric acid diphosphate from wet-process phosphoric acid. The special fertilizer for winter melon is prepared from the filtrate of ammonium hydrogen phosphate to solve the problem that the active ingredients in the filtrate of ammonium dihydrogen phosphate produced by wet-process phosphoric acid cannot be used, etc. There is no report in domestic fertilizer production

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