A kind of production method of magnesium-doped hydroxyapatite defluoridation filter material

A technology of hydroxyapatite and production method, applied in chemical instruments and methods, phosphorus compounds, neutralized water/sewage treatment, etc., can solve problems such as less research, and achieve improved fluorine removal capacity, high Simple and easy-to-control equipment

Inactive Publication Date: 2019-05-03
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, hydroxyapatite is widely used in bone and tooth implants in the medical field, and magnesium-substituted hydroxyapatite has recently been used in artificial bone substitutes in bone tissue engineering. The addition of magnesium can stimulate osteoblast proliferation, It shows that magnesium has good biocompatibility, and there is no hidden danger of entering the human body in drinking water, but there are few studies on magnesium-doped hydroxyapatite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. According to the molar ratio of magnesium to calcium is 0.06, weigh 236kg of calcium nitrate and 12.82kg of magnesium nitrate, adjust it into a paste with water, add the paste mixture of magnesium nitrate and calcium nitrate into the reaction kettle, and stir until uniform;

[0042] 2. Determine the dosage of phosphoric acid as 69L according to the ratio of the sum of moles of soluble magnesium salt and calcium salt to the molar ratio of phosphoric acid of 1.5

[0043] 3. According to the volume ratio of phosphoric acid and water 1:3, add 69L of phosphoric acid into 207L of water and stir evenly to form a solution;

[0044] 4. Add the above phosphoric acid solution dropwise to the reactor, and control the dropping rate to 200L / h;

[0045] 5. During the process of adding phosphoric acid, add ammonia water drop by drop to the reaction kettle at the same time, and adjust the pH value of the reaction system to 9;

[0046] 6. After the phosphoric acid is added dropwise, ...

Embodiment 2

[0050] 1. According to the molar ratio of magnesium to calcium is 0.12, weigh 236kg of calcium nitrate and 25.64kg of magnesium nitrate, adjust it into a paste with water, add the paste mixture of magnesium nitrate and calcium nitrate into the reaction kettle, and stir until uniform;

[0051] 2. Determine the dosage of phosphoric acid as 68L according to the ratio of the sum of moles of soluble magnesium salt and calcium salt to the molar ratio of phosphoric acid is 1.6;

[0052] 3. According to the volume ratio of phosphoric acid and water 1:3, add 68L of phosphoric acid into 204L0L of water, stir evenly to form a solution;

[0053] 3. Add the above phosphoric acid solution dropwise to the reactor, and control the dropping rate to 200L / h;

[0054] 4. During the dropwise addition of phosphoric acid, add ammonia water dropwise to the reaction kettle at the same time to adjust the pH value of the reaction system to 10;

[0055] 5. After the phosphoric acid is added dropwise, co...

Embodiment 3

[0059] 1. According to the molar ratio of magnesium to calcium is 0.24, weigh 236kg of calcium nitrate and 51.28kg of magnesium nitrate, adjust it into a paste with water, add the paste mixture of magnesium nitrate and calcium nitrate into the reaction kettle, and stir until uniform;

[0060]2. Determine the dosage of phosphoric acid as 67L according to the ratio of the sum of moles of soluble magnesium salt and calcium salt to the molar ratio of phosphoric acid is 1.8;

[0061] 3. According to the volume ratio of phosphoric acid and water 1:3, add 67L of phosphoric acid into 201L of water, stir evenly to form a solution;

[0062] 3. Add the above phosphoric acid solution dropwise to the reactor, and control the dropping rate to 200L / h;

[0063] 4. During the process of adding phosphoric acid, add ammonia water drop by drop to the reaction kettle at the same time, and adjust the pH value of the reaction system to 11;

[0064] 5. After the phosphoric acid is added dropwise, st...

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PUM

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Abstract

The invention discloses a production method of a magnesium-doped hydroxyapatite defluorination filter material. The method comprises the steps of adopting industrial calcium salt, phosphoric acid, ammonia water and soluble magnesium salt as raw materials; mixing the soluble magnesium salt and calcium salt with determined addition quality into paste, and adding the paste to a reaction kettle for stirring evenly; preparing a phosphoric acid solution according to the volume ratio of the phosphoric acid to water; dropwise adding the solution to the reaction kettle and simultaneously dropwise adding ammonium hydroxide to the reaction kettle to keep the pH value of a reaction system within a set range in real time; and carrying out stirring, standing and ageing, taking out a product, filtering, drying and crushing to obtain a magnesium-doped hydroxyapatite powder filter material. Due to doping of a little of magnesium, the structure of hydroxyapatite can distort, lattice defects are increased, the crystallinity is reduced, the grain size is reduced, the specific surface area is increased, and the physical adsorption reaction of the surface is added, so that the magnesium-doped hydroxyapatite defluorination filter material plays a synergistic role in defluorination of the hydroxyapatite, and the defluorination capacity of a product is improved.

Description

technical field [0001] The invention relates to a production method of a fluorine-removing filter material, in particular to a production method suitable for a magnesium-doped hydroxyapatite filter material with high fluoride-removal capacity. Background technique [0002] Fluorine is one of the essential trace elements for the human body and is closely related to calcium and phosphorus metabolism. The main form of fluoride intake by the human body is through drinking water. Adequate intake of fluoride can enhance the hardness of the body's bones and teeth, promote the metabolism of the enzyme system, and help transmit nerve excitement. However, when the human body takes in more than 1.5mg / L of fluoride for a long time, it will cause dental fluorosis in mild cases, and skeletal fluorosis in severe cases. Therefore, finding ways to reduce fluoride in drinking water is of great significance in the field of drinking water purification. [0003] At present, adsorption method i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C02F1/28C02F1/66
CPCC01B25/325C01P2006/80C02F1/281C02F1/66
Inventor 冯莉刘泽山
Owner CHINA UNIV OF MINING & TECH
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