Method for preparing ammonium phosphate and preparing special fertilizer for longan as byproduct

Abstract

The invention relates to the technical field of chemical industry, and especially relates to a method for preparing ammonium phosphate and preparing a special fertilizer for longan as a byproduct. The nutrition demand condition in the longan growth process is analyzed, and the disadvantages of an ammonium phosphate product preparation technology are analyzed, so the method combining a technology for preparing a special combined composite fertilizer for longan with a technology for preparing the ammonium phosphate product makes the two technologies complement to each other, reduces the discharge amount of a waste liquid in the ammonium phosphate product preparation technology, avoids the disadvantages of low purity of the ammonium phosphate product due to deep crystallization and improves the quality of the ammonium phosphate product. The adjustment and the matching of nutritional elements in the waste liquid make the prepared special composite fertilizer for longan meet nutrition demands of longan, so the growth speed of longan is improved, the output and the quality of longan are improved, the hardening rate of soil is reduced, the utilization rate of soil is improved, and the method has substantial environmental protection values and substantial economic benefits.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing ammonium phosphate by-product longan special fertilizer. Background technique [0002] Longan is a perennial evergreen fruit tree. After planting, the root system continuously and selectively absorbs certain nutrients from the soil for a long time, which is likely to cause a deficiency of certain nutrients, which requires continuous supplementation in production. According to analysis, an orchard with a yield of 1,000 kg of fresh longan fruit per mu needs to absorb 4.01-4.8 kg of nitrogen, 1.46-1.58 kg of phosphorus, and 7.54-8.96 kg of potassium from the soil every year. The ratio of nitrogen, phosphorus, and potassium is 10:3:17 -20. [0003] Usually, crops have a low absorption rate of nitrogen, phosphorus and potassium in fertilized nitrogen, phosphorus and potassium fertilizers, and most of the nitrogen, phosphorus and potassium e...

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Problems solved by technology

[0004] At the same time, in the preparation process of ammonium phosphate products, one of wet-process phosphoric acid and hot-process phosphoric acid is usually used to prepare ammonium phosphate products. This process will affect the purity of ammonium phosphate products, making ammonium phosphate The purity of the product is low. Therefore, it is necessary to design an additional purification process for ammonium phosphate to purify the ammonium phosphate product, thereby increasing the preparation cost of the ammonium phosphate product. Therefore, some people react by using phosphoric acid and urea at a temperature lower than 80 degrees Celsius. To produce an intermediate such as urea phosphate, and then use the intermediate as a raw material to react with ammonia gas to produce ammonium phosphate products. This process requires cooling and cyclic crystallization of ammonium phosphate products, but often requires deep crystallization of ammonium phosphate products. Only in this way can a large amount of nitrogen and phosphorus nutrients in the waste liquid be discharged into the environment, thereby avoiding the waste of resources and reducing the production cost of ammonium phosphate products. However, due to the deep crystallization process, other products will also be crystallized out. , thereby affecting the purity of the ammonium phosphate product

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