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Method for producing feed grade dicalcium phosphate

A technology of monocalcium phosphate and production methods, which is applied in the direction of animal feed, animal feed, chemical instruments and methods, etc., can solve the problem of incomplete crystallization water of calcium hydrogen phosphate and calcium dihydrogen phosphate, large investment in phosphoric acid concentration equipment, and production process Process lengthening and other issues, to achieve the effect of advanced technology and product quality, improved biological potency, and complete crystallization water

Inactive Publication Date: 2008-07-23
四川川恒控股集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The first method uses phosphoric acid to react with the semi-finished product of calcium hydrogen phosphate. The first step is to produce the semi-finished product of calcium hydrogen phosphate by precipitation method to make the production process longer. When preparing calcium hydrogen phosphate by precipitation method, white phosphorus fertilizer and mother liquor precipitation and Wastewater, the production cost of this process is high, the utilization rate of phosphorus is low, and the environmental impact is large
[0008] Another method uses concentrated and purified phosphoric acid to directly react with calcium carbonate. Although white phosphorus fertilizer and mother liquor precipitation are no longer produced, and the utilization rate of phosphorus is improved, due to the use of phosphoric acid concentration and defluorination technology, the phosphoric acid concentration device has a large investment and equipment maintenance costs are high; At the same time, due to the solid-phase conversion reaction between concentrated phosphoric acid and calcium carbonate, the aging time is long, the material reaction is not complete, and the product purity is not high.
The most important thing is: due to the lack of free water in the reaction system, the crystallization water of calcium hydrogen phosphate and calcium dihydrogen phosphate generated is incomplete.
According to the research of Sichuan Agricultural University Caohui (2003) and RUCKER (1968), it is found that the dissolution rate of phosphate containing crystal water in acidic environment is faster than that of phosphate without crystal water, and the phosphate containing crystal water dissolves in the small intestine Under the action of gastric acid, it can be quickly dissolved and absorbed by animals. Therefore, the absorption and utilization rate of phosphate containing crystal water by animals is higher than that of phosphate without crystal water. The biological potency is lower than that of monocalcium phosphate products containing crystal water completely

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  • Method for producing feed grade dicalcium phosphate
  • Method for producing feed grade dicalcium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the reaction tank, add 3095Kg of wet purification phosphoric acid (in P 2 o 5The calculated concentration is 39.7%), stir well, slowly add 888Kg of calcium carbonate under stirring, make it into calcium dihydrogen phosphate slurry, after neutralization reaction for 30 minutes, continue to slowly add lime milk 821Kg (water content 60%), continue to stir for 30 minutes after the gray milk is added, and transfer to the vibrating screen to separate the coarse particles. The slurry is sprayed from the transfer tank through the centrifugal spray pump to the spray plate, and dried with hot air with an inlet temperature of 400°C. The temperature of the tower is 90°C. After the material comes out of the bottom of the tower, it is sieved through a 2mm diameter sieve to obtain 2645Kg of monocalcium phosphate product. Its product quality indicators are as follows:

[0039] Total Phosphorus

Embodiment 2

[0041] Add 6138Kg of wet purification phosphoric acid (in P 2 o 5 The calculated concentration is 10.2%), stir well, slowly add 242Kg of calcium oxide under stirring, make it into calcium dihydrogen phosphate slurry, after neutralization reaction for 30 minutes, continue to slowly add lime milk 415Kg (water content 60%), continue to stir for 30 minutes after the gray milk is added, transfer to the vibrating screen to separate the coarse particles, the slurry is sprayed from the transfer tank through the centrifugal spray pump to the spray plate, and dried by hot air with an inlet temperature of 180°C. The temperature of the tower is 90°C. After the material comes out of the bottom of the tower, it passes through the rotary cylinder with the temperature of the air inlet at 600°C and the temperature of the air outlet at 70°C. Its product quality indicators are as follows:

[0042] Total Phosphorus

Embodiment 3

[0044] In the reaction tank, add 3742Kg of wet purification phosphoric acid (in P 2 o 5 Concentration is 33%), stir well, slowly add 1600Kg milk of lime (water content is 60%) under stirring, make adjustment into calcium dihydrogen phosphate slurry, after 30 minutes of neutralization reaction, continue to slowly add to the slurry Add 821Kg of lime milk (moisture content 60%), continue to stir for 30 minutes after adding lime milk, transfer to vibrating screen to separate coarse particles, the slurry is sent from the transfer tank to the spray plate through the centrifugal spray pump, and the inlet temperature is 750 ℃ hot air drying, the outlet temperature is 90℃, after the material comes out from the bottom of the tower, it is passed through a rotary cylinder with an air inlet temperature of 600℃ and an air outlet temperature of 70℃. Monodicalcium phosphate products. Its product quality indicators are as follows:

[0045] Total Phosphorus

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Abstract

The process of producing feed grade calcium phosphate features that the calcium phosphate producing process includes the first liquid phase neutralizing reaction between dilute phosphoric acid and calcium containing compound in the reactor to produce calcium dihydrogen phosphate slurry, the subsequent adding calcium containing compound for the second liquid phase neutralizing reaction to produce mixture slurry of calcium hydrogen phosphate and calcium dihydrogen phosphate, and the spray drying of the slurry to obtain the calcium phosphate product. The production process has no produced white fertilizer and waste water, high phosphorus utilization rate, low production cost, less environmental pollution and well preservation of crystalline water resulting in high biological potency.

Description

technical field [0001] The invention relates to a method for producing monocalcium phosphate, in particular to a two-step liquid-phase neutralization reaction production of dilute phosphoric acid and calcium-containing compounds (calcium carbonate, calcium oxide, calcium hydroxide and defluorinated tricalcium phosphate). The monocalcium phosphate method. Background technique [0002] Feed grade monocalcium phosphate is between feed grade calcium dihydrogen phosphate and feed grade calcium hydrogen phosphate in performance, and its basic composition is a mineral feed additive of calcium hydrogen phosphate and calcium dihydrogen phosphate. It contains both water-soluble phosphorus and citrate-soluble phosphorus, so it is not only suitable for livestock and poultry feed, but also as a mineral feed additive for aquatic feed, especially for the digestion and utilization of phosphorus in livestock and poultry feed compared with calcium hydrogen phosphate The rate is 7%-14% higher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32A23K1/175A23K20/24
Inventor 李光明李进王佳才邹建
Owner 四川川恒控股集团股份有限公司