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Production method of feed grade calcium phosphate acidity agent

A production method and technology of sour agent, applied in the direction of animal feed, animal feed, additional food elements, etc., can solve the problems of calcium ion loss, large energy consumption, long defluorination time, etc., to reduce production cost, improve utilization rate, The effect of short defluorination time

Active Publication Date: 2008-10-22
GUIZHOU CHANHEN CHEM CO LTD
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AI Technical Summary

Problems solved by technology

[0006] Although the acidity of the concentrated slurry in this process is lower than that of concentrated phosphoric acid, which reduces the corrosion of the slurry to the concentration equipment, and the cheap phosphorus and calcium in the phosphate rock can enter the phosphoric acid, but the material is always in the liquid phase during the concentration process, and calcium ions The entry of concentrator will seriously foul the concentrator, greatly reduce the heat transfer efficiency, and even make the process impossible; the efficiency of concentrated defluorination is low, and the phosphoric acid cycle rate must be increased, the defluorination time is long, and the energy consumption is large, which is different from concentrated phosphoric acid defluorination There is no essential change in the ratio; in addition, a large amount of sulfuric acid is consumed, which causes the loss of valuable calcium ions that have entered the phosphoric acid, and at the same time produces phosphogypsum waste

Method used

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  • Production method of feed grade calcium phosphate acidity agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Adopt Yunnan phosphate rock, its quality is: P 2 o 5 33.12%, CaO 47.03%, MgO 0.96% Fe 2 o 3 1.08%, Al 2 o 3 0.88%, F 3.01%, use a mill to grind into -60 mesh to reach 92% fine powder, add phosphate rock powder and wet-process phosphoric acid with a phosphoric acid concentration of 65%, and add 30% excess wet-process phosphoric acid to the reactor at the same time, The reaction materials were mixed and acidolyzed in the reactor, and after a reaction time of 4 hours, water was added to the materials to form a thick slurry with a solid content of 52%, and then the thick slurry was sent to a spray tower for atomization drying and defluorination, and then The temperature of the hot air in the tower is 580°C, and the temperature of the hot air exiting the tower is 140°C. After defluorination and drying, the dry calcium dihydrogen phosphate powder containing free phosphoric acid is obtained. The fluorine content of the dry powder product is 0.14%. Enter an appropriate a...

Embodiment 2

[0044] Using Guizhou phosphate rock, its quality is: P 2 o 5 34.32%, CaO 48.14%, MgO 1.04% Fe 2 o 3 1.11%, Al 2 o 3 0.50%, F 3.51%, use a mill to grind into -120 mesh to reach 85% fine powder, add phosphate rock powder and thermal phosphoric acid with a phosphoric acid concentration of 12%, add 20% excess thermal phosphoric acid to the reactor and mix at the same time Reaction, after 4 hours of reaction time, the prepared slurry is sent to the spray tower for atomization drying and defluorination. The temperature of the hot air entering the tower is 1000°C, and the temperature of the hot air exiting the tower is 275°C. Calcium dihydrogen phosphate dry powder, the fluorine content of the dry powder product is 0.12%, and the dry powder obtains the powdery feed grade calcium phosphate sour agent through cooling and packing, and the product quality is shown in Table 2. SiF drawn from the reactor and spray drying tower 4 With HF gas, after condensation washing, get H 2 Si...

Embodiment 3

[0048] Using Guizhou phosphorus concentrate, its quality is: P 2 o 5 36.55%, CaO 49.45%, MgO 0.83%, Fe 2 o 3 0.58%, Al 2 o 3 0.37%, F 3.12%, the fineness of the concentrate is -160 mesh to reach 89% fine powder, the phosphoric acid powder and the phosphoric acid concentration of phosphoric acid are 54%, and the excess of 40% of the phosphoric acid is added to the reactor at the same time for mixed reaction , the reaction time is 5 hours, and the slurry is sent to the spray tower for atomization drying and defluorination. The temperature of the hot air entering the tower is 153 ° C, and the temperature of the hot air exiting the tower is 70 ° C. After defluorination and drying, dihydrogen phosphate containing free phosphoric acid is obtained Calcium dry powder, the fluorine content of the dry powder product is 0.17%, and the dry powder obtains the powdery feed grade calcium phosphate sour agent through cooling and packaging. 4 With HF gas, after condensation washing, ge...

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Abstract

The invention discloses a production method for a feed-grade calcium phosphate acidity agent; the production method includes that: excessive phosphoric acid and ground phosphorite are added in a reactor for hybrid reaction to prepare calcium dihydrogen phosphate material containing fluorine and phosphoric acid, the material is added into a dryer for drying and defluorination to prepare the defluorinated calcium phosphate acidity agent containing free phosphoric acid. The production method has the main technical advantages of quick defluorination, extremely high efficiency, resource saving, extremely low cost, environmental-friendly property, energy saving and emission reduction; the technique inevitably brings about the revolution of feed calcium phosphate acidity agent industry.

Description

Technical field: [0001] The invention relates to a production method of a sour agent, in particular to a production method of a feed-grade calcium phosphate sour agent. Specifically, excessive phosphoric acid is used to completely acidify phosphate rock, so that the fluoride in the phosphate rock is converted into HF and SiF 4 、H 2 SiF 6 The form, the material is dried by spray dryer at high temperature, HF, SiF 4 、H 2 SiF 6 Escaping with water vapor, the sour agent containing phosphoric acid and calcium dihydrogen phosphate is produced. Background technique: [0002] Sour agent is a food additive whose main purpose is to impart sour taste to food. Sour agent is divided into organic acid and inorganic acid. Organic acids such as citric acid, tartaric acid, malic acid, etc., inorganic acid is mainly phosphoric acid. The use of phosphoric acid and calcium phosphate mixed as a sour agent has not been reported so far. The sour agent produced by the present invention is fee...

Claims

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Application Information

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IPC IPC(8): A23K1/16A23K20/26
Inventor 李进李光明王佳才邹建
Owner GUIZHOU CHANHEN CHEM CO LTD
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