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

A technology of hydroxyapatite and production method, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problem of high material cost, improve fluoride removal performance, and benefit large-scale Large-scale production and popularization and utilization, and the effect of high fluoride removal capacity

Inactive Publication Date: 2020-10-23
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patent documents all use hydroxyapatite as the main body, and gradually modify it to achieve the purpose of deep defluorination, but the cost of the material is still relatively high, and the defluoridation capacity needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. According to the carbon-to-phosphorus molar ratio of ammonium bicarbonate and phosphoric acid is 0.02, the mass of ammonium bicarbonate to be added is 1.72kg, and the volume of phosphoric acid to be added is 73L;

[0039] 2. According to the ratio of the moles of calcium nitrate to the sum of the moles of ammonium bicarbonate and phosphoric acid is 1.3, the dosage of calcium nitrate is determined to be 236kg.

[0040] 3. Weigh 236kg of calcium nitrate and 1.72kg of ammonium bicarbonate respectively, adjust it into a paste with dewatered water, add the paste mixture into the reaction kettle, and stir until uniform while adding;

[0041] 4. According to the volume ratio of phosphoric acid and water 1:3, add 73L of phosphoric acid into 219L of water, stir evenly to form a solution;

[0042] 5. Add the above phosphoric acid solution dropwise to the reactor, and control the dropping rate to 200L / h;

[0043] 6. During the process of adding phosphoric acid, add ammonia wat...

Embodiment 2

[0047] 1. According to the carbon-to-phosphorus molar ratio of ammonium bicarbonate and phosphoric acid is 0.04, determine the dosing mass of ammonium bicarbonate as 3.44kg, and the dosing volume of phosphoric acid as 73L;

[0048] 2. According to the ratio of the moles of calcium nitrate to the sum of the moles of ammonium bicarbonate and phosphoric acid is 1.5, the dosage of calcium nitrate is determined to be 268kg.

[0049] 3. Weigh 268kg of calcium nitrate and 3.44kg of ammonium bicarbonate respectively, make a paste with water, add the paste mixture into the reaction kettle, and stir until uniform;

[0050] 4. According to the volume ratio of phosphoric acid and water: 1:3, add 73L of phosphoric acid into 219L of water and stir evenly to form a solution;

[0051] 5. Add the above phosphoric acid solution dropwise to the reactor, and control the dropping rate to 200L / h;

[0052] 6. During the process of adding phosphoric acid, add ammonia water drop by drop to the reacti...

Embodiment 3

[0056] 1. According to the carbon-to-phosphorus molar ratio of ammonium bicarbonate and phosphoric acid is 0.08, the mass of ammonium bicarbonate to be added is determined to be 6.88kg, and the volume of phosphoric acid to be added is 73L;

[0057] 2. According to the ratio of the moles of calcium nitrate to the sum of the moles of ammonium bicarbonate and phosphoric acid is 1.2, the dosage of calcium nitrate is determined to be 230kg.

[0058] 3. Weigh 230kg of calcium nitrate and 6.88kg of ammonium bicarbonate respectively, make a paste with water, add the paste mixture into the reaction kettle, and stir until uniform while adding;

[0059] 4. According to the volume ratio of phosphoric acid and water: 1:3, add 73L of phosphoric acid into 219L of water and stir evenly to form a solution;

[0060] 5. Add the above phosphoric acid solution dropwise to the reactor, and control the dropping rate to 200L / h;

[0061] 6. During the process of adding phosphoric acid, add ammonia wate...

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Abstract

The invention discloses a production method of a carbon-doped hydroxyapatite defluorination filter material. The method comprises the steps of adopting industrial calcium nitrate, phosphoric acid, ammonia water and ammonium bicarbonate as raw materials; and synthesizing the carbon-doped hydroxyapatite defluorination filter material, wherein the ammonia water is capable of playing a role in regulating the pH value of a reaction system to ensure the purity and defluorination capacity of a product. The doping amount of the ammonium bicarbonate is extremely low. Crystal lattices of hydroxyapatite distort due to doping of CO3<2->, the hole concentration of the surface is correspondingly increased, the structure becomes loose, and the surface chemical activity is correspondingly strengthened, so that the defluorination ability is improved; and the total defluorination capacity of the filter material is improved by 3-4 times in comparison with that of a single hydroxyapatite defluorination filter material and improved by over 7 times in comparison with that of an activated aluminum oxide defluorination filter material. The method is simple, the defluorination effect is stable for a long period of time, and the production efficiency is higher.

Description

technical field [0001] The invention relates to a production method of a fluoride-removing filter material, in particular to a production method of a carbon-doped hydroxyapatite filter material suitable for a fluoride-removal filter material. Background technique [0002] Fluorosis caused by drinking high-fluoride water is an endemic disease worldwide. In mild cases, it can cause dental fluorosis, and in severe cases, it can cause skeletal fluorosis. The World Health Organization stipulates that the fluorine content in drinking water should not exceed 1.5mg / L. Since high-fluorine water is mainly distributed in rural and pastoral areas with harsh environments, complex terrain, lack of water and electricity, inconvenient transportation, backward economy, and low income, adsorption is currently the most commonly used method for defluoridation of drinking water at home and abroad. The key point of the adsorption method is to select the appropriate adsorbent. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58
CPCC02F1/583
Inventor 冯莉刘泽山
Owner CHINA UNIV OF MINING & TECH
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