A kind of production method for preparing potassium dihydrogen phosphate by-product chrysanthemum special fertilizer

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 chrysanthemum 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, the N, P and K compounded fertilizer is produced, a filtrate is adjusted to be acidic, and a formaldehyde solution is added to prepare the controlled release compound fertilizer. The method improves the purity of ammonium dihydrogen phosphate, and the produced special fertilizer for chrysanthemum has high absorptivity, can meet the nutrition needs of chrysanthemum in all stages of the growth period of chrysanthemum, greatly increases the output of chrysanthemum, and 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 potassium dihydrogen phosphate by-product chrysanthemum special fertilizer. Background technique [0002] Potassium 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 potassium dihydrogen phosphate compound fertilizer. The production methods mainly include neutralization method, extraction method, ion exchange method, metathesis method, direct meth...

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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. Later, due to rainwater soaking or fertilizer self-decomposition, the nutrients in the soil cannot supply the needs of the chrysanthemums, resulting in slowing down or stopping the growth of the chrysanthemums.

[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 chrysanthemum special fertilizer and the absorption situation of chrysanthemum from a large amount 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 chrysanthemum is produced from the filtrate of potassium hydrogen phosphate to solve the problems that the purity of potassium dihydrogen phosphate produced by wet process phosphoric acid is not high, and the active ingredients in the filtrate cannot be used. At the same time, the special fertilizer has a good absorption rate and a controllable release effect. Domestic fertilizer production, no report

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