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Production method for calcium hydrogen phosphate

A technology of calcium hydrogen phosphate and production methods, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of not having better economic benefits, difficult separation of slag, high production costs, etc., and achieve significant environmental protection value and economy Benefits, avoiding the removal of waste residues, and the effect of avoiding waste removal

Inactive Publication Date: 2014-09-03
GUIZHOU KAILIN GRP MINERAL FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Production method for calcium hydrogen phosphate

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Effect test

Embodiment 1

[0057] A production method of calcium hydrogen phosphate, specifically comprising the following steps:

[0058] (1) Preparation of calcium hydroxide solution: measure and add a certain amount of water in the calcium hydroxide preparation tank, then add calcium oxide with a purity of 80% according to the mass ratio of calcium oxide and water at a ratio of 1:2, and add it while adding Stir the mixed solution of calcium oxide and water at a speed of 100r / min according to the stirring speed. After the addition is completed, continue to stir for 20min to mix the calcium oxide and water evenly to obtain a calcium hydroxide solution for subsequent use;

[0059] (2) Preparation of urea phosphate solution: add 1000kg of water into the urea phosphate dissolving tank, then add urea phosphate solid with a purity of 80%, stir while adding to make it dissolve evenly, and the stirring speed is 30r / min to prepare urea phosphate Saturated solution, spare;

[0060] (3) Synthesis of calcium hyd...

Embodiment 2

[0064] A production method of calcium hydrogen phosphate, specifically comprising the following steps:

[0065] (1) Preparation of calcium hydroxide solution: measure and add a certain amount of water in the calcium hydroxide preparation tank, then add calcium oxide with a purity of 85% according to the mass ratio of calcium oxide to water at a ratio of 1:3.5, and add it while adding Stir the mixed solution of calcium oxide and water at a speed of 30 r / min according to the stirring speed. After the addition is completed, continue to stir for 5 minutes to mix the calcium oxide and water evenly to obtain a calcium hydroxide solution for subsequent use;

[0066] (2) Preparation of urea phosphate solution: add 1000kg of water into the urea phosphate dissolving tank, then add urea phosphate solid with a purity of 87%, stir while adding to make it dissolve evenly, the stirring speed is 50r / min, and prepare urea phosphate Saturated solution, spare;

[0067] (3) Synthetic of calcium ...

Embodiment 3

[0071] A production method of calcium hydrogen phosphate, specifically comprising the following steps:

[0072] (1) Preparation of calcium hydroxide solution: measure and add a certain amount of water in the calcium hydroxide preparation tank, then add calcium oxide with a purity of 88% according to the mass ratio of calcium oxide to water at a ratio of 1:2.5, and add it while adding Stir the mixed solution of calcium oxide and water at a speed of 70r / min according to the stirring speed. After the addition is completed, continue to stir for 10min to mix the calcium oxide and water evenly to obtain a calcium hydroxide solution for subsequent use;

[0073] (2) Preparation of urea phosphate solution: add 1000kg of water into the urea phosphate dissolving tank, then add urea phosphate liquid with a purity of 90%, stir while adding to make it dissolve evenly, and the stirring speed is 40r / min to prepare saturated urea phosphate solution, spare;

[0074] (3) Synthesis of calcium hy...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 朱飞武廖吉星彭宝林周勇王先炜郑超周宾
Owner GUIZHOU KAILIN GRP MINERAL FERTILIZER CO LTD
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