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Production method of attapulgite loaded hydroxyapatite composite defluorination filter bulb

The technology of hydroxyapatite and attapulgite is applied in ion exchange water/sewage treatment, adsorbed water/sewage treatment and other directions, which can solve the problems of mixing calcium hydrogen phosphate, affecting the fluorine removal capacity of products, etc., and achieves a simple preparation process, It is beneficial to large-scale production and popularization and utilization, and the effect of improving the defluorination capacity

Active Publication Date: 2013-06-26
JIANGSU YONGGUAN WATER & WASTERWATER EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the control of calcium-phosphorus ratio and pH value in this production method is the key to the production of pure hydroxyapatite. If the control is not good, the product is likely to be mixed with by-products such as calcium hydrogen phosphate, calcium dihydrogen phosphate, and calcium phosphate, which will affect the product. Fluoride removal capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Add 500L water into the reactor and heat to 75°C;

[0026] 2. Add 1.5 kg of glacial acetic acid and stir evenly;

[0027] 3. Weigh 125Kg of calcium hydroxide, add it to the reaction kettle, and stir for 4 minutes;

[0028] 4. Add 105kg of phosphoric acid into 315kg of water and stir evenly to form a solution;

[0029] 5. Add the above-mentioned phosphoric acid solution dropwise into the reactor, and control the dropping rate to be 12kg / min;

[0030] 6. React at a temperature of 75°C for 2.5 hours;

[0031] 7. Add 70kg attapulgite, stir evenly, and react for 1 hour at a temperature of 75°C;

[0032] 8. Take out the product, perform dehydration, washing, drying, and crushing to obtain attapulgite-loaded hydroxyapatite powder;

[0033] 9. Put the attapulgite-loaded hydroxyapatite powder into the ball forming machine, spray the sodium carboxymethyl cellulose binder with a mass percentage of 1%, and make the powder into small balls with a diameter of 0.5-1.5 mm. ball...

Embodiment 2

[0036] 1. Add 500L water into the reactor and heat to 75°C;

[0037] 2. Add 2kg of glacial acetic acid and stir evenly;

[0038] 3. Weigh 125Kg of calcium hydroxide, add it to the reaction kettle, and stir for 5 minutes;

[0039] 4. Add 100kg of phosphoric acid into 300kg of water and stir evenly to form a solution;

[0040] 5. Add the above-mentioned phosphoric acid solution dropwise into the reactor, and control the dropping rate to be 10kg / min;

[0041] 6. React at a temperature of 75°C for 2.5 hours;

[0042] 7. Add 63kg attapulgite, stir evenly, and react for 1 hour at a temperature of 75°C;

[0043] 8. Take out the product, perform dehydration, washing, drying, and crushing to obtain attapulgite-loaded hydroxyapatite powder;

[0044] 9. Put the attapulgite-loaded hydroxyapatite powder into the ball forming machine, spray the hydroxyethyl cellulose binder with a mass percentage of 1%, and make the powder into small balls with a diameter of 0.5-1.5mm ;

[0045] 10. T...

Embodiment 3

[0047] 1. Add 500L water into the reactor and heat to 80°C;

[0048] 2. Add 1kg of glacial acetic acid and stir evenly;

[0049] 3. Weigh 125Kg of calcium hydroxide, add it to the reaction kettle, and stir for 3 minutes;

[0050] 4. Add 110kg of phosphoric acid into 330kg of water and stir evenly to form a solution;

[0051] 5. Add the above-mentioned phosphoric acid solution dropwise into the reactor, and control the dropping rate to be 15kg / min;

[0052] 6. React for 2.5 hours at 80°C;

[0053] 7. Add 75kg attapulgite, stir evenly, and react for 1 hour at a temperature of 80°C;

[0054] 8. Take out the product, perform dehydration, washing, drying, and pulverization to obtain attapulgite-loaded hydroxyapatite powder;

[0055] 9. Put the attapulgite-loaded hydroxyapatite powder into the ball forming machine, spray the sodium carboxymethyl cellulose binder with a mass percentage of 1.5%, and make the powder into small balls with a diameter of 0.5-1.5 mm. ball;

[0056] 1...

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Abstract

The invention discloses a production method of an attapulgite loaded hydroxyapatite composite defluorination filter bulb, which comprises the following steps: preparing attapulgite loaded hydroxyapatite powder from industrial-grade calcium hydroxide, phosphoric acid, acetic acid and attapulgite as raw materials, regulating the solubility of calcium hydroxide using acetic acid, and controlling calcium-phosphorus ratio and pH value of the solution so as to ensure the purity and the defluorination capacity of the products; and fabricating the attapulgite loaded hydroxyapatite powder into pelletsof diameters 0.5-1.5mm, and drying and molding the pellets at a temperature ranging from 350 to 450 DEG C so as to obtain attapulgite loaded hydroxyapatite composite defluorination filter bulb. The composition of attapulgite and hydroxyapatite reduces cost, is helpful for pellet formation, and enhances defluorination of hydroxyapatite. The method of the invention uses cheap and easily-accessible raw materials, high capacity of defluorination filter bulbs, long service life and small fluent water resistance, , and is simple in preparation, easy for control and regeneration, and easy for large-scale industrial production and promotion.

Description

technical field [0001] The invention relates to a production method of a composite defluoridation filter ball, in particular to a production method of an attapulgite-loaded hydroxyapatite composite defluorination filter ball suitable for removing excessive fluorine in drinking water. Background technique [0002] Fluorine is one of the most widely distributed elements on the earth's surface. It is generally believed that trace amounts of fluorine are beneficial to the firmness of bones, but excessive fluorine is toxic to the human body. Since the human body absorbs as much as 90% of fluorine in drinking water, the fluorine in the body mainly comes from drinking water. 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-fluor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/42
Inventor 冯莉刘泽山
Owner JIANGSU YONGGUAN WATER & WASTERWATER EQUIP CO LTD
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