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Method for producing feed-grade calcium phosphate

A production method and technology of calcium phosphate, which is applied to high temperature drying of materials through a spray dryer, can solve the problems of calcium ion loss, long defluorination time, large energy consumption, etc., so as to reduce production costs, shorten defluorination time, and improve utilization rate. Effect

Active Publication Date: 2008-09-17
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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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. The entry of ions makes the fouling of the concentrator serious, greatly reduces the heat transfer efficiency, and even makes the process impossible. This process cannot realize industrialized mass production
At the same time, the process also suffers from excessive acid hydrolysis of phosphate ore, which makes it difficult to separate the intermediate product from the excess circulating acid after defluorination; the efficiency of concentrated defluorination is low, and the phosphoric acid cycle rate must be increased, and the defluorination time is long and energy consumption is low. The consumption is large, and there is no essential change compared with the defluorination ratio of concentrated phosphoric acid; in addition, a large amount of sulfuric acid is consumed, which causes the loss of valuable calcium ions that have entered phosphoric acid, and produces phosphogypsum waste at the same time

Method used

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  • Method for producing feed-grade calcium phosphate

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Effect test

Embodiment 1

[0041] Using Guizhou phosphate rock, its quality is: P 2 o 5 35.32%, CaO 48.74%, MgO 0.84% ​​Fe 2 o 3 1.38%, Al 2 o 3 0.70%, F 2.48%, use a mill to grind -60 mesh to reach 90% fine powder, add phosphate rock powder and wet-process phosphoric acid with a phosphoric acid concentration of 69%, and add 40% excess wet-process phosphoric acid to the reactor at the same time, and react The materials are mixed and acidolyzed in the reactor. After the reaction time is 4 hours, water is added to the materials to make a thick slurry with a solid content of 58%, and then sent to the spray tower for atomization drying and defluorination. The temperature of the hot air entering the tower is 600°C , the temperature of the hot air coming out of the tower is 152°C, and the fluorine content of the acidic calcium phosphate after defluorination and drying is 0.14%. This material is sent to the mixer, and CaCO 3 and sprayed into water to neutralize free acid, and the material after neutral...

Embodiment 2

[0045] Using Guizhou phosphate rock, its quality is: P 2 o 5 33.32%, CaO 45.94%, MgO 0.94% Fe 2 o 3 1.68%, Al 2 o 3 0.30%, F 3.11%, use a mill to grind into -100 mesh to reach 82% fine powder, add phosphate rock powder and thermal phosphoric acid with a phosphoric acid concentration of 12%, add 30% excess thermal phosphoric acid to the reactor at the same time and mix Reaction, after 6 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 298 ° C. The acidic calcium phosphate after defluorination and drying The fluorine content is 0.12%, and then this material is sent into the mixer, and the CaCO of the theoretical consumption of free phosphoric acid is added. 3 And spray into water to neutralize free acid, and the material of neutralizing free phosphoric acid is sent to the rotary drum dryer ...

Embodiment 3

[0049] Using Guizhou phosphorus concentrate, its quality is: P 2 o 5 36.92%, CaO 49.16%, MgO 0.60%, Fe 2 o 3 0.38%, Al 2 o 3 0.29%, F 3.62%, the fineness of the concentrate is -160 mesh and reaches 83%, the phosphoric acid powder and the phosphoric acid concentration of phosphoric acid are 52%, and the excess of 20% of the phosphoric acid is added to the reactor at the same time to mix and react. The 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 155°C, and the temperature of the hot air exiting the tower is 72°C. The fluorine content of the acidic calcium phosphate after defluorination and drying is 0.17%. , and then send this material into the mixer, add CaO of the theoretical consumption of free phosphoric acid to the mixer and spray it into water to neutralize free phosphoric acid, and the material neutralized free phosphoric acid enters the rotary cylinder dr...

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Abstract

The invention discloses a forage level calcium phosphate production method, comprising that excess phosphoric acid and rock phosphate are added into a reactor to react mixedly; the calcium dihydrogen phosphate material containing fluorine and phosphoric acid; the material is added into a drier to be dried and defluorinated, and the forage level calcium phosphate is made. The forage level calcium phosphate production method has the advantages of fast defluorination, high efficiency, resource saving, low cost, friendly environment, energy saving and emission reducing, which brings the industrial revolution of forge phosphate.

Description

Technical field: [0001] The invention relates to a production method of feed-grade calcium phosphate, specifically using excess phosphoric acid to completely acidolyze phosphate rock to convert fluoride in the phosphate rock 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 Escape together with water vapor to obtain acidic defluorinated calcium phosphate dry powder, and then neutralize excess phosphoric acid in the dry powder to produce feed grade calcium phosphate. Background technique: [0002] At present, most of the methods for producing feed-grade calcium phosphate in the world use wet-process phosphoric acid, and the harmful impurity fluorine contained in wet-process phosphoric acid must be removed. According to the different methods of phosphoric acid defluorination, there are three processes, one is chemical defluorination of wet-process phosphoric acid to produce calcium phosphate; the other is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 李进李光明王佳才邹建
Owner GUIZHOU CHANHEN CHEM CO LTD
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