Method for producing feed grade calcium hydrophosphate

A technology of calcium hydrogen phosphate and feed grade, which is applied in the production of calcium hydrogen phosphate and calcium dihydrogen phosphate mixture, and the field of feed grade calcium hydrogen phosphate III type products, can solve the problems of phosphorus production and low phosphorus utilization rate, and achieve the curing time. The effect of short, simple production process and easy process

Inactive Publication Date: 2013-12-11
WENGFU (GRP) CO LTD
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Problems solved by technology

However, the phosphorus content in sewage is low, and only qualified calcium hydrogen phosphate can be produced. As an animal feed additive, compared with calcium dihydrogen phosphate, the phosphorus utilization rate of the former is far lower than that of the latter.
However, the production of the latter requires a high concentration of phosphoric acid, which cannot be produced directly by recycling phosphorus in wastewater.

Method used

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  • Method for producing feed grade calcium hydrophosphate

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Embodiment Construction

[0012] Process flow chart of the present invention is as figure 1 shown.

[0013] Raw materials: phosphogypsum slag yard pool water, containing 1.7% phosphorus, lime, containing calcium oxide ≧ 85%

[0014] ① Impurity removal process for slag yard pool water:

[0015] a. Pool water removal process: pool water, lime dosage ratio is pool water: lime = 1: 0.01-0.02, appropriate amount of sodium sulfide;

[0016] Control conditions: the pressure is normal pressure, the reaction temperature is 30-60°C, and the reaction time is 1-2.5 hours;

[0017] b. Slurry filtration: The filtration equipment is an automatic backwash filter, and after filtration, a clear liquid with a phosphorus content of about 1.2% is obtained.

[0018] ② Feed grade calcium hydrogen phosphate type I preparation process:

[0019] The clear liquid obtained by filtering is mixed with a certain concentration of lime milk, the pH value is adjusted between 5.5-6.3, and the reaction time is controlled for 1-3 ...

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Abstract

The invention discloses a method for producing feed grade calcium hydrophosphate III. The method comprises the steps as follows: slag field tank water and lime milk are mixed in a reactor and defluorinated, and after the obtained slurry is deposited, an supernatant liquid and the lime milk react in the reactor to obtain feed grade calcium hydrophosphate I, then react with phosphoric acid, and are dried, filtered and separated to obtain feed grade calcium hydrophosphate III. Compared with other methods of preparing feed grade calcium hydrophosphate III with wet process phosphoric acid, the method produces the feed grade calcium hydrophosphate I by utilizing phosphogypsum slag filed tank water with a low phosphorous content, treating and improving the content of the phosphorus are needless, the feed grade calcium hydrophosphate I can be directly produced only after purity removal, the product process is simple, and the phosphorus resource can be effectively reused. Moreover, the method is short in curing time, easy to control the process, and free of waste discharge during the whole process.

Description

technical field [0001] The invention relates to a production method of feed grade calcium phosphate salt, in particular to a production method of feed grade calcium hydrogen phosphate type III product, that is, a mixture of calcium hydrogen phosphate and calcium dihydrogen phosphate. Background technique [0002] In recent years, the problem of eutrophication of water quality has become more and more serious. Recovery of P in sewage 2 o 5 It can greatly reduce the pollution of phosphorus to the environment and alleviate the shortage of phosphorus resources in my country. However, the phosphorus content in sewage is low, and only qualified calcium hydrogen phosphate can be produced. As an additive for animal feed, compared with calcium dihydrogen phosphate, the phosphorus utilization rate of the former is far lower than that of the latter. However, the production of the latter requires a high concentration of phosphoric acid, which cannot be produced directly by recycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 杨毅晋华胡国涛周智武张金堂
Owner WENGFU (GRP) CO LTD
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