A production method for preparing calcium dihydroxide phosphate special fertilizer for peony by-product

Abstract

The invention relates to the technical field of chemical industry, and especially relates to a method for preparing potassium dihydrogen phosphate and preparing a special fertilizer for peony as a byproduct. The temperature and other coefficients of the preparation technology of potassium dihydrogen phosphate from phosphoric acid through a wet process are changed, so the purity of the potassium dihydrogen phosphate product is improved, and the N, P and K compounded fertilizer is produced; and formaldehyde is added to a filtrate to prepare the controlled release compound fertilizer. The method improves the purity of potassium dihydrogen phosphate, and the produced special fertilizer for peony has high absorptivity, can meet the nutrition needs of peony in all stages of the growth period of peony, and is an efficient compound fertilizer.

Description

Technical field [0001] The present invention relates to the technical field of chemical industry, in particular to a production method for preparing special fertilizer for peony by-product of potassium dihydrogen phosphate. Background technique [0002] Potassium dihydrogen phosphate is widely used in almost all types of crops such as various types of cash crops, grains, fruits, vegetables, etc. It has many excellent effects such as significant increase in production and income, improvement of yield, optimization of quality, resistance to lodging, resistance to pests, and prevention of premature aging. It has the function of overcoming the nutrient deficiency caused by the decline of the absorption capacity of the root system in the later stage of the crop growth. It is a new type high-concentration phosphate-potassium two-element compound fertilizer and a high-efficiency phosphate-potassium compound fertilizer for agriculture. At present, many domestic fertilizer manufacturers a...

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Problems solved by technology

[0014] 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. In the later period, due to rainwater soaking or fertilizer self-decomposition, the nutrients in the soil cannot supply the needs of the peony, resulting in a slowdown or stop of the growth of the peony.

[0015] In the process of producing potassium dihydrogen phosphate from wet-process phosphoric acid, the purity of potassium 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 tree peony special fertilizer and the absorption of tree peony 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 peony is prepared from the filtrate of potassium hydrogen phosphate, which solves the problems of low purity of potassium 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 controllable release effect. Domestic fertilizer production, no report

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