Production method for preparing calcium hydrophosphate with special Chinese prickly ash fertilizer as byproduct

Abstract

The invention relates to the technical field of chemical engineering, and particularly relates to a production method for preparing calcium hydrophosphate with a special Chinese prickly ash fertilizer as a byproduct. Through analysis on the effective absorptive amount of nitrogen phosphorus potassium elements according to the fertilizer required by Chinese prickly ash, and adjustment and collocation of element content in a production process, the prepared composite fertilizer in a compound sate can meet the requirements of the Chinese prickly ash to the maximal extent while over-high cost caused by improper collocation of the elements in production of the composite fertilizer is reduced, and excessive elements are further prevented from being fed to soil to cause environmental pollution due to solidification of the composite fertilizer; meanwhile, the effective absorption rate of the prepared special Chinese prickly ash fertilizer is relatively high and can reach over 97.5%, nutrient elements left in a soil structure layer are relatively few, the damage caused by soil hardening is avoided, the growth environment of the Chinese prickly ash is improved, and the growth environment quality of the Chinese prickly ash is ensured.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing a special fertilizer for Zanthoxylum bungeanum by-product of calcium hydrogen phosphate. Background technique [0002] Sichuan pepper (scientific name: Zanthoxylum bungeanum Maxim.), alias: fenugreek, Dajiao, Qinjiao, Shujiao, Sichuan pepper, Dahongpao or Sanjiao. It is a deciduous shrub or small tree of Rutaceae and Zanthoxylum, which can be planted alone or used as a protective thorn fence. The peel can be used as seasoning, and aromatic oil can be extracted, and it can be used as medicine. The seeds can be eaten, and it can also be processed to make soap. It can remove the fishy smell of various meats; promote saliva secretion, increase appetite; dilate blood vessels, thereby lowering blood pressure. [0003] At present, there is no special compound fertilizer for the planting of Chinese prickly ash. The fertilizers are usually mad...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no special compound fertilizer for the cultivation of Zanthoxylum bungeanum. The fertilizer is usually used by the growers in combination with traditional chemical fertilizers, potassium dihydrogen phosphate, and urea. When planting Zanthoxylum bungeanum, farmers basically first Use chemical fertilizers as the base fertilizer, and then use potassium dihydrogen phosphate and urea to make compound fertilizers to fertilize Zanthoxylum bungeanum. The amount of each fertilization is 100kg containing 3kg of potassium dihydrogen phosphate and 0.5kg of urea. It needs to be applied 6 times a year. A total of 18 kg of potassium dihydrogen phosphate and 3 kg of urea are used, and the effective absorption of nitrogen, phosphorus and potassium by crops is 20% to 46%, 10% to 25%, and 45% to 60%. It can be seen that a large amount of nitrogen, phosphorus, and potassium Potassium fertilizer put into the soil is difficult to be absorbed by pepper crops, and then remains in the soil. At the same time, according to the mass ratio of nitrogen, phosphorus and potassium elements fertilized into the soil: 5.6:31:39, and the ratio of effective absorption by crops However, it cannot meet this requirement. The absorption of nitrogen and potassium elements is relatively large, while the absorption of phosphorus elements is relatively small. Therefore, it can be concluded that the compound fertilizer prepared according to the traditional pepper fertilizer will leave a large amount of Phosphorus in the soil, and then erodes and reacts with calcium elements or other trace elements in the soil for a long time, causing changes in the soil structure layer, causing compaction, affecting the quality of the soil, and causing serious ecological and environmental problems

[0004] At the same time, in the preparation process of calcium hydrogen phosphate products, it is often accompanied by the crystallization of calcium hydrogen phosphate products, and the movement of dynamic equilibrium occurs inside the solution. However, due to the need to consider the output of calcium hydrogen phosphate products, and then reduce The process cost of product production, for this reason, the most possible crystallization mother liquor will be used in the prior art, and even the mother liquor circulation crystallization treatment will be used, so that the calcium hydrogen phosphate in the mother liquor will be enriched and then crystallized. However, such deep crystallization or circulation Crystallization will result in poor purity of calcium hydrogen phosphate products, which in turn affects the quality of calcium hydrogen phosphate products. Some researchers also use the premise of reducing the amount of impurities in raw materials to prepare calcium hydrogen phosphate products. The calcium hydrogen phosphate that can be produced has both Under the premise of cost, its purity is still poor, and in the process of preparing calcium hydrogen phosphate products, it will also cause a large amount of waste liquid to be treated before being discharged, which further leads to higher production costs and greater environmental pollution

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