Production method for calcium hydrogen phosphate

Abstract

The invention relates to the technical field of chemical engineering, and particularly relates to a production method for calcium hydrogen phosphate. A calcium hydrogen phosphate product is prepared by reacting calcium oxide with a certain amount of water to form a calcium hydroxide solution; then reacting the calcium hydroxide solution with urea phosphate under stirring; controlling a pH value at 5.5-6.5; reacting for 5-20 min under stirring continuously and terminating the reaction. By adopting urea phosphate as a direct resource of phosphorus in the calcium hydrogen phosphate product, processes of removing impurities such as metal ions and fluorine in a process for producing feed level calcium hydrogen phosphate by using wet-process phosphoric acid are omitted; phosphorus utilization rate in the whole process is high; removal of a lot of wastes is prevented; and production cost of calcium hydrogen phosphate is reduced. In the obtained calcium hydrogen phosphate product, phosphorus content is 16.8-17.3%; calcium content is 20.35-22.2%; and fluorine content is 0.012-0.023%. The obtained calcium hydrogen phosphate product can fully meet the standard of feed level calcium hydrogen phosphate.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method of calcium hydrogen phosphate. Background technique [0002] Calcium hydrogen phosphate is an important mineral feed additive, which contains a large amount of calcium and phosphorus mineral elements, and is the two most abundant mineral elements in animals. If the supply of calcium and phosphorus is insufficient, or the ratio of calcium and phosphorus in the animal body is out of balance, it will lead to abnormal bone development of the animal, and even cause chondrosis; at the same time, phosphorus forms phosphorus compounds in the animal body, distributed in Various parts of the body, such as blood, muscle, brain and nerve tissue, regulate acid-base balance; calcium is also closely related to the secretion and coagulation of animal milk, muscle contraction, and nerve stimulation; for the addition of calcium and phosphorus elements in animals, It ...

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Problems solved by technology

[0006] For example, the patent No. 98814284.8 "Method for preparing calcium hydrogen phosphate or monocalcium phosphate from calcium phosphate" includes the reaction of calcium phosphate and inorganic acid to produce calcium salt and phosphoric acid, hydrolysis of calcium salt to generate calcium base, and reaction of calcium base and phosphoric acid to prepare phosphoric acid Calcium hydrogen, it can be seen that the process of this method is relatively long, and impurities such as inorganic acids and chlorine elements will be brought into the production process, resulting in poor product purity and unstable product quality.

[0007] It can be seen that in the prior art, the fluorine content of the produced calcium hydrogen phosphate product is relatively large, it is difficult to meet the requirements of feed grade, and it is necessary to carry out defluorination treatment through the production process, but the slag after defluorination treatment is difficult to separate; and, The soluble phosphorus content in the produced products is low, and the phosphorus loss is large, and its discharge will cause environmental pollution, which is not conducive to environmental protection; at the same time, the entire production process is long, the production cost is high, and it does not have better economic benefits

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