Preparation method of high-purity calcium hydrogen phosphate

A calcium hydrogen phosphate and high-purity technology is applied in the field of preparation of high-purity calcium hydrogen phosphate, which can solve the problems of low purity and uneven particles of calcium hydrogen phosphate, and achieve the effects of less impurities, high purity and resource saving.

Inactive Publication Date: 2018-05-18
SICHUAN MIANZHU SANJIA FEED CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its preparation methods include: 1, sulfuric acid extraction phosphoric acid direct neutralization method; 2, double decomposition method; 3,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A preparation method of high-purity calcium hydrogen phosphate, comprising the steps of:

[0014] (1) Preparation of acid: Add phosphoric acid solution and phosphate rock powder with a mass fraction of 30% into the reactor and heat and stir at a temperature of 60°C for 30 minutes. After precipitation and filtration, desulfurization and fluorine phosphoric acid solution are obtained. ;

[0015] (2) Preparation of alkali: add a certain amount of water to the calcium oxide powder and put it into an ultrasonic oscillator for ultrasonic stirring for 8 minutes and frequency: 35KHz to make a calcium hydroxide suspension;

[0016] (3) Reaction: Put the phosphoric acid solution in step 1 and the calcium hydroxide suspension in step 2 into a reaction kettle for reaction, the temperature is 65°C, the pH is controlled at about 5.5, the reaction time is 30 minutes and continuous stirring is performed to generate phosphoric acid Calcium hydrogen solution, after excessive calcium hyd...

Embodiment 2

[0022] A preparation method of high-purity calcium hydrogen phosphate, comprising the steps of:

[0023] (1) Preparation of acid: Add phosphoric acid solution and phosphate rock powder with a mass fraction of 35% into the reactor and heat and stir at a temperature of 65°C for 35 minutes. After precipitation and filtration, desulfurization and fluorine phosphoric acid solution are obtained. ;

[0024] (2) Preparation of alkali: add a certain amount of water to the calcium oxide powder and put it into an ultrasonic oscillator for ultrasonic stirring for 10 minutes and frequency: 40KHz to make a calcium hydroxide suspension;

[0025] (3) Reaction: Put the phosphoric acid solution in step 1 and the calcium hydroxide suspension in step 2 into the reaction kettle for reaction, the temperature is 70°C, the pH is controlled at about 5.5, the reaction time is 35 minutes and continuous stirring is performed to generate phosphoric acid Calcium hydrogen solution, after excessive calcium ...

Embodiment 3

[0031] A preparation method of high-purity calcium hydrogen phosphate, comprising the steps of:

[0032] (1) Preparation of acid: Add phosphoric acid solution and phosphate rock powder with a mass fraction of 40% into the reactor and heat and stir at a temperature of 70°C for 50 minutes. After precipitation and filtration, desulfurization and fluorine phosphoric acid solution are obtained. ;

[0033] (2) Preparation of alkali: add a certain amount of water to the calcium oxide powder and put it into an ultrasonic oscillator for ultrasonic stirring for 15 minutes and frequency: 50KHz to make a calcium hydroxide suspension;

[0034] (3) Reaction: put the phosphoric acid solution in step 1 and the calcium hydroxide suspension in step 2 into the reaction kettle for reaction, the temperature is 75°C, the pH is controlled at about 6, the reaction time is 50 minutes and continuous stirring is performed to generate phosphoric acid Calcium hydrogen solution, after excessive calcium hy...

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Abstract

The invention relates to the technical field of calcium hydrogen phosphate preparation, and discloses a preparation method of high-purity calcium hydrogen phosphate. An acid-alkali neutralization method is adopted, a phosphoric acid solution with a mass part of 30%-40% is used, calcium oxide powder is placed in an ultrasound vibrator for ultrasonic agitation after a certain amount of water is added, time is 5-15 minutes, frequencies are 30-50 kHz, and a calcium hydroxide suspension is made. The phosphoric acid solution and the calcium hydroxide suspension are put into a reaction still for reactions at temperatures of 65-75 DEG C, ph is controlled at about 5.5-6, reaction time is 30-50 minutes, and continuous stirring is conducted to generate a calcium hydrogen phosphate solution, and the calcium hydrogen phosphate is obtained after drying and evaporation; the calcium hydrogen phosphate has the advantages of capable of saving resources, being recyclable, and containing less impurities.

Description

technical field [0001] The invention relates to the technical field of calcium hydrogen phosphate preparation, in particular to a method for preparing high-purity calcium hydrogen phosphate. Background technique [0002] Calcium hydrogen phosphate, white monoclinic crystalline powder, odorless and tasteless. It usually exists in the form of dihydrate (its chemical formula is CaHPO4 2H2O), is stable in the air, and begins to lose crystal water and become anhydrous when heated to 75°C; the uses of calcium hydrogen phosphate are: 1. Used as a strengthening agent ( Calcium supplement) and fluffy agent, according to my country’s regulations, it can be used for biscuits and infant formula food, with a maximum usage of 1g / kg; it can also be used as a quality improver for fermented flour products, and it can be used in an appropriate amount according to production needs; 2. As a food feed Additives to supplement phosphorus and calcium elements in poultry feed; 3. Used as a bulking ag...

Claims

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Application Information

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IPC IPC(8): C01B25/32
CPCC01B25/322C01P2006/80
Inventor 黄鹤鸣
Owner SICHUAN MIANZHU SANJIA FEED CO LTD
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