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Production method of feed grade calcium dihydrogen phosphate

A technology of calcium dihydrogen phosphate and production method, which is applied in the directions of animal feed, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of poor product quality, complicated process of calcium dihydrogen phosphate and high energy consumption, and achieve a simple production process. , superior market competitiveness, low energy consumption

Active Publication Date: 2019-07-05
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing method for producing calcium dihydrogen phosphate has complicated process, high energy consumption and poor product quality

Method used

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  • Production method of feed grade calcium dihydrogen phosphate
  • Production method of feed grade calcium dihydrogen phosphate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 produces feed grade calcium dihydrogen phosphate with the inventive method

[0041] The specific operation steps are as follows:

[0042] (1) get the filtrate that obtains when the present invention prepares calcium dihydrogen phosphate, cool filtrate to 30 ℃, make slurry with calcium carbonate, the solid content of calcium carbonate slurry is 15%; Phosphoric acid P 2 o 5 The concentration is 40%; the P of calcium carbonate slurry and defluorophosphoric acid 2 o 5 / Ca is 1.7, calcium carbonate and defluorophosphoric acid are reacted once, and the first reaction temperature is 38°C;

[0043] (2) the primary reaction slurry is separated, the filtrate enters the cooling process, and the filter cake enters the secondary reaction process, and the phosphoric acid and the P of the primary reaction filter cake feed intake in the secondary reaction process 2 o 5 / Ca is 3.95, and the temperature of the secondary reaction slurry is 50°C;

[0044] (3) Atomize and...

Embodiment 2

[0045] Embodiment 2 Produce feed grade calcium dihydrogen phosphate with the inventive method

[0046] The specific operation steps are as follows:

[0047] (1) get the filtrate that obtains when the present invention prepares calcium dihydrogen phosphate, be cooled to 35 ℃, make slurry with calcium carbonate, the solid content of calcium carbonate slurry is 25%; Phosphoric acid P 2 o 5 The concentration is 35%; the P of calcium carbonate slurry and phosphoric acid 2 o 5 / Ca is 2.0, calcium carbonate and phosphoric acid react once, and the first reaction temperature is 45°C;

[0048] (2) the primary reaction slurry is separated, the filtrate enters the cooling process, and the filter cake enters the secondary reaction process, and the phosphoric acid and the P of the primary reaction filter cake feed intake in the secondary reaction process 2 o 5 / Ca is 3.9, and the temperature of the secondary reaction slurry is 60°C;

[0049] (3) Atomize and dry the secondary reaction ...

Embodiment 3

[0050] Embodiment 3 Production feed grade calcium dihydrogen phosphate with the inventive method

[0051] (1) adopt normal temperature water and calcium carbonate slurrying, the solid content of calcium carbonate slurry is 42%; Phosphoric acid P 2 o 5 The concentration is 31%; the P of calcium carbonate slurry and phosphoric acid 2 o 5 / Ca is 1.8, calcium carbonate and phosphoric acid react once, and the first reaction temperature is 35°C;

[0052] (2) the primary reaction slurry is separated, the filtrate enters the cooling process, and the filter cake enters the secondary reaction process, and the phosphoric acid and the P of the primary reaction filter cake feed intake in the secondary reaction process 2 o 5 / Ca is 3.82, and the temperature of the secondary reaction slurry is 45°C;

[0053] (3) Atomize and dry the secondary reaction slurry, and obtain the calcium dihydrogen phosphate product MCP product-3# after cooling.

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Abstract

The invention belongs to the field of calcium phosphate manufacturing and specifically relates to a production method for feed-grade monocalcium phosphate. In order to solve the problems of complex process, high energy consumption and low product quality of the present method for producing monocalcium phosphate, the invention provides the production method for feed-grade monocalcium phosphate. The method comprises the following steps: a) mixing calcium carbonate slurry with phosphoric acid, reacting and filtering after ending the reaction, thereby acquiring filtrate and filter cake; b) adding phosphoric acid into the filter cake acquired in the step a) and performing secondary reaction; c) after ending the secondary reaction, atomizing the slurry after reacting in the step b), drying and cooling, thereby acquiring the feed-grade monocalcium phosphate. The monocalcium phosphate produced according to the method provided by the invention is characterized by high output, high purity, high water-soluble phosphate ratio and low free acid. The method has the advantages of simple production process, low energy consumption, low production cost, high operability and advantageous market competitiveness.

Description

technical field [0001] The invention belongs to the field of calcium phosphate production, and in particular relates to a production method of feed-grade calcium dihydrogen phosphate. Background technique [0002] There are three kinds of calcium phosphate salts: calcium dihydrogen phosphate (MCP), calcium hydrogen phosphate (DCP), and tricalcium phosphate (TCP). Due to biological potency and safety, tricalcium phosphate was gradually eliminated; calcium hydrogen phosphate developed rapidly, but due to the low content of water-soluble phosphorus, its development was limited; The calcium salt is the highest, and the water-soluble phosphorus content is relatively high, accounting for more than 90% of the total phosphorus, which is conducive to the absorption of calcium and phosphorus by aquatic animals. It is an excellent and efficient phosphate feed additive and is widely used in aquaculture animals and livestock. Feed additives for farmed animals. [0003] At present, the ...

Claims

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Application Information

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IPC IPC(8): C01B25/32A23K20/26
CPCA23K20/26C01B25/32C01P2006/80C01P2006/82
Inventor 龙辉王佳才李顺方吴海斌石建华曾春华杨烽
Owner GUIZHOU CHANHEN CHEM CO LTD
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