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

A technology of hydroxyapatite and its production method, which is applied in the fields of chemical instruments and methods, water/sludge/sewage treatment, adsorption water/sewage treatment, etc. It can solve the problem that nano-scale materials are not easy to intercept, have no industrial application, and the preparation process is complicated and other issues, to achieve the effects of large-scale production and popularization and utilization, improvement of fluorine removal ability, and low finished product

Active Publication Date: 2017-04-26
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydroxyapatite powder in the above-mentioned patent has a large specific surface area and a high fluoride removal capacity, but it is not easy to be trapped in the water body; the hydroxyapatite ball has the advantages of easy regeneration and smooth water discharge, but the fluoride removal capacity is relatively low
[0005] At present, there are reports of some new defluoridation filter materials, such as magnesium defluoridation agent, chitosan defluorination agent, etc. Although this type of defluorination agent has a high fluoride removal capacity, the cost of raw materials is relatively high, and the preparation process is relatively complicated. There is no industrial application; there are also some nano-materials used as filter materials for fluorine removal, such as nano molecular sieves, nano-active zirconia, iron oxide-alumina composite nano-materials for fluoride removal, etc. , nano-scale materials are not easy to intercept, and if they remain in drinking water, there is a danger of invading the human body
Therefore there is no industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Crush the bauxite and pass it through a 325-mesh sieve; weigh 700Kg of bauxite and roast it in a muffle furnace for 1.5 hours at a roasting temperature of 600°C;

[0026] 2. Put the roasted bauxite into the reaction kettle, add 1000L of hydrochloric acid, and carry out the acid dissolution reaction. The acid leaching temperature is 85°C, and the acidification is 3h;

[0027] 3. Slowly add 70Kg of sodium aluminate into the reaction kettle, and react for 5 hours at a temperature of 80°C. After the reaction is completed, cool to room temperature and filter with suction to obtain the filtrate of the semi-finished aluminum-based material, which is ready for use;

[0028] 4. Add 500L water to another reactor, heat to 60°C, and keep the water temperature;

[0029] 5. Weigh 125Kg of calcium hydroxide, make a paste with cold water, add it to the reaction kettle, and stir for 5 minutes;

[0030] 6. Add 105kg of phosphoric acid into 315kg of water and stir evenly to form a sol...

Embodiment 2

[0036] 1. Crush the bauxite and pass it through a 325-mesh sieve; weigh 1000Kg of bauxite and roast it in a muffle furnace for 1.5 hours at a roasting temperature of 650°C;

[0037] 2. Put the roasted bauxite into the reaction kettle, add 1500L of hydrochloric acid, and carry out the acid dissolution reaction. The acid leaching temperature is 90°C, and the acidification is 3h;

[0038] 3. Slowly add 100Kg of sodium aluminate into the reactor, and react for 5 hours at a temperature of 90°C. After the reaction is finished, cool to room temperature and suction filter to obtain the semi-finished filtrate of the aluminum-based material for use;

[0039] 4. Add 500L water to another reactor and heat to 75°C;

[0040] 5. Weigh 125Kg of calcium hydroxide, make a paste with cold water, add it to the reaction kettle, and stir for 5 minutes;

[0041] 6. Add 100kg of phosphoric acid into 300kg of water and stir evenly to form a solution;

[0042] 7. Add the above phosphoric acid soluti...

Embodiment 3

[0047] 1. Crush the bauxite and pass it through a 325-mesh sieve; weigh 1400Kg of bauxite and roast it in a muffle furnace for 1.5h at a roasting temperature of 700°C;

[0048] 2. Put the roasted bauxite into the reaction kettle, add 2100L of hydrochloric acid, and carry out the acid dissolution reaction. The acid leaching temperature is 95°C, and the acidification is 3h;

[0049] 3. Slowly add 140Kg of sodium aluminate into the reactor, and react for 5 hours at a temperature of 90°C. After the reaction is finished, cool to room temperature and suction filter to obtain the semi-finished filtrate of the aluminum-based material for use;

[0050] 4. Add 500L water to another reactor and heat to 90°C;

[0051] 5. Weigh 125Kg of calcium hydroxide, make a paste with cold water, add it to the reaction kettle, and stir for 5 minutes;

[0052] 6. Add 100kg of phosphoric acid into 300kg of water and stir evenly to form a solution;

[0053] 7. Add the above phosphoric acid solution dr...

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PUM

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Abstract

The invention relates to a production method of an aluminum-doped hydroxyapatite defluorinating filter material. The production method comprises the following steps: using bauxite, hydrochloric acid, calcium hydroxide and phosphoric acid as main raw materials; weighing bauxite, roasting bauxite in a muffle furnace and putting bauxite into a reaction kettle, and adding hydrochloric acid based on mass of bauxite for warming acid dissolution reaction; adding sodium aluminate for sufficient reaction to obtain an aluminum base semiproduct filtrate; adding water which is 5 times calcium hydroxide by mass into another reaction kettle and heating and maintaining water temperature; preparing calcium hydroxide into a paste with cold water, adding the paste into the reaction kettle and uniformly stirring; preparing a phosphoric acid solution by phosphoric acid and dropwise adding the phosphoric acid solution into the reaction kettle, and after dropwise adding the phosphoric acid solution, adding the aluminum base semiproduct filtrate and continuously insulating for doping reaction; naturally cooling to the room temperature, taking out the product, dehydrating, washing, drying and crushing. By replacing calcium in hydroxyapatite by aluminum, the material is of positive electricity, so that electrostatic adsorption with fluorinions of negative electricity is improved, and therefore, the defluorinating capacity of the material is improved.

Description

technical field [0001] The invention relates to a production method of a fluoride-removing filter material. The fluoride-removal filter material is an aluminum-doped hydroxyapatite filter material for fluoride removal. Background technique [0002] Fluorosis caused by drinking high-fluoride water is an endemic disease worldwide. At present, the most commonly used defluoridation method at home and abroad is mainly the adsorption method. There are many kinds of defluoridation adsorbents, such as zeolite, clay, activated carbon, activated alumina, bone carbon and hydroxyapatite, etc., which have been used in different periods. However, most are no longer used due to various problems. [0003] For example, zeolite is greatly disturbed by raw water quality, and its fluoride removal capacity is low, so it has not been well promoted and applied; the color, turbidity and smell of bone carbon defluoridation water are often unsatisfactory, and have basically withdrawn from the Chines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28C02F1/58
CPCB01J20/04B01J20/3085C02F1/281C02F1/583
Inventor 冯莉刘泽山苗真勇邵菊芳石美
Owner CHINA UNIV OF MINING & TECH
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