Method for preparing dicalcium phosphate and tricalcium phosphate

A technology of tricalcium phosphate and dicalcium phosphate, which is applied in the field of calcium phosphate salts, can solve the problems of not being able to directly produce dicalcium phosphate and tricalcium phosphate, and achieve good economic and environmental benefits, simple process, and less waste discharge.

Inactive Publication Date: 2014-01-15
顾春光
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  • Description
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  • Application Information

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  • Method for preparing dicalcium phosphate and tricalcium phosphate

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Embodiment 1

[0028] Embodiment 1: Taking wet-process phosphoric acid as raw material

[0029] Table 1. Chemical composition of wet-process phosphoric acid

[0030] project P 2 o 5 CaO MgO Fe 2 o 3 Al 2 o 3 F SO 3 Mass fraction % 28.30 0.16 1.25 1.10 0.98 1.64 1.63

[0031] Add 800g of wet-process phosphoric acid into the reaction tank, add concentrated ammonia water with a mass fraction of 25% under stirring to neutralize to a pH of about 8.0, the reaction temperature is 50°C to 80°C, and the residence time is 1.5 hours, after which the neutralized slurry is filtered; the obtained Add 1000g of calcium chloride solution with a mass fraction of 20% to the filtrate under stirring, the reaction temperature is 30°C-60°C, and the residence time is 1.0 hour. Finally, the synthetic slurry is filtered, washed with water, and dried to obtain 462g of dicalcium phosphate product. The chemical composition of the product is shown in Table 2.

[0032] Ta...

Embodiment 2

[0034] Embodiment 2: the solution that decomposes phosphate rock with nitric acid is used as raw material to prepare dicalcium phosphate

[0035] Table 3 Chemical composition of nitric acid decomposition solution

[0036] project P 2 o 5 CaO MgO F % 22.4 4.30 0.78 1.82

[0037] Table 4 Chemical composition of calcium nitrate

[0038] project P 2 o 5 CaO MgO F % 0.14 19.2 0.25 0.01

[0039] Add 1000g of nitric acid solution to decompose phosphate rock and 220g of filtered gypsum lotion into the reaction tank, add 80g of ammonium sulfate under stirring, react at 30°C to 90°C for 1 hour, then filter the material and wash with water; the obtained filtrate Use 25% ammonia water to neutralize to a pH of about 8.0, the reaction temperature is 50°C to 80°C, and the residence time is 1.5 hours; then filter the neutralized slurry; mix the obtained filtrate with the dicalcium phosphate lotion and add 750g of calcium nitrat...

Embodiment 3

[0042] Embodiment 3: use the solution of nitric acid to decompose phosphate rock as raw material to prepare tricalcium phosphate

[0043] The chemical composition of the solution for decomposing phosphate rock with nitric acid is the same as in Example 2.

[0044] Add 1000g of nitric acid decomposition solution and 230g of lotion into the reaction tank, add 80g of ammonium sulfate under stirring, react at 30°C to 90°C for 1 hour, then filter the material and wash with water; neutralize the obtained filtrate with 25% ammonia water to The pH is about 14.0, the reaction temperature is 30°C-50°C, the reaction process needs to be cooled down, and the residence time is 1.5-3 hours; the neutralized slurry is filtered, the obtained filtrate is mixed with the tricalcium phosphate washing liquid, and 1100g of calcium nitrate is added under stirring. The reaction temperature is 30°C-80°C, and the residence time is 1.0-2 hours; finally, the synthetic slurry is filtered, and the filter cak...

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Abstract

The invention discloses a method for preparing dicalcium phosphate and tricalcium phosphate. The method comprises: preparing diammonium phosphate and triammonium phosphate through phosphoric acid extracted from industrial phosphoric acid or sulfuric acid or a nitric acid decomposition solution obtained by nitric acid decomposition phosphorite and freezing crystallization and separation of calcium nitrate, and then, carrying out a double decomposition reaction on the diammonium phosphate and the triammonium phosphate with calcium nitrate or calcium chloride to prepare the dicalcium phosphate and the tricalcium phosphate. The specific production process comprises: step 1. neutralization and impurity removal; step 2. double decomposition; step 3. filtration and drying. The method provided by the invention can be used for preparing dicalcium phosphate or tricalcium phosphate products and further producing feed grade or food grade dicalcium phosphate or tricalcium phosphate products; and the method is simple in process, little in waste emission, environment-friendly and is applied in traditional phosphorus chemical industry to realize structure adjustment and product upgrade and update so as to generate good economic benefit and environmental protection benefit. The method is suitable for production enterprises of ammonia, nitric acid or ammonium phosphate.

Description

technical field [0001] The present invention relates to calcium phosphate salts, in particular to dicalcium phosphate (commonly known as calcium hydrogen phosphate) and tricalcium phosphate, and further to methods for preparing dicalcium phosphate and tricalcium phosphate. Background technique [0002] Dicalcium phosphate or tricalcium phosphate are mainly used as livestock and poultry feed additives and chemical fertilizers, as well as in the manufacture of ceramics and colored glass. Since the ratio of calcium to phosphorus in tricalcium phosphate is closer to the bone composition of animals, most of the tricalcium phosphate produced in the United States, Western Europe, and the Commonwealth of Independent States is used as a feed additive for livestock and poultry, accounting for about 30% to 50% of the feed phosphate. %. [0003] At present, the main production process of dicalcium phosphate at home and abroad is: decompose phosphate rock with sulfuric acid, filter and ...

Claims

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Application Information

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IPC IPC(8): C01B25/32
Inventor 张钦顾春光虞江
Owner 顾春光
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