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Method for producing filter material for removing fluorine from drinking water

A production method and drinking water technology, applied in the direction of chemical instruments and methods, applications, water pollutants, etc., can solve the problems of increased water flow resistance, easy hardening of defluoridation agents, and dense support filter screens, etc., to achieve smooth water discharge , small investment in equipment, small resistance effect

Active Publication Date: 2012-04-04
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

This kind of research has improved the defluorination capacity and defluorination effect to varying degrees, but there are still problems such as easy hardening of the defluorination agent, short service life, low regeneration efficiency, and the risk of excessive aluminum ions
[0009] The second is the research of some new defluoridation agents, such as Chinese patent: 200910074805.X discloses a preparation method of magnesium defluoridation agent for drinking water; 200710185294.X discloses a modified chitosan for defluoridation in water Cross-linked resin and its preparation method; 200810015153.8 disclosed method of preparing defluorinating agent by using chitosan, a seafood processing waste; 200810015152.3 disclosed method of using chitosan to prepare fluorinating agent; Preparation and application method of adsorbent (using natural seabed iron-manganese nodules); 200510116751.0 discloses a composite metal (using rare earth element) oxide fluorine removal adsorbent; 200910235470.5 discloses a composite metal (using metal zirconium iron) oxide Fluoride-removing adsorbent and its preparation method, the defluoride-removing agent of this kind of research has high fluoride removal capacity, but the cost of raw materials is relatively high, and the preparation process is relatively complicated
Such as Chinese patent: 200710150940.9 discloses a method for removing fluoride from drinking water, using nano-molecular sieves; Preparation and application of alumina composite nano-materials for fluorine removal. Although the adsorption specific surface area of ​​this type of nano-materials will increase, as a filter material for fluorine removal, the required support filter will be too dense, and the flow resistance of water will increase. , will also cause the loss of adsorbent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. According to the size of the reactor, determine the dosage of calcium hydroxide to be 100Kg, the molar ratio of calcium to phosphorus is 1.67, and determine the dosage of phosphoric acid to be 50L;

[0038] 2. Add 500L water to the reactor, heat it to 70°, and keep the water temperature;

[0039] 3. Weigh 100Kg of calcium hydroxide, mix it into a paste with cold water, and stir it into the reaction kettle while adding it, so that the calcium hydroxide suspension is mixed evenly;

[0040] 4. Add phosphoric acid to 150L water to make a solution, add it dropwise to the reaction kettle, stir while dropping, control the dropwise addition for about one hour, continue stirring, and keep the temperature at 70° for 90 minutes;

[0041]5. Take out the product, dehydrate, wash, dry, and pulverize to obtain hydroxyapatite powder;

[0042] 6. Add 20% urea and 30% attapulgite to 50% hydroxyapatite powder and mix evenly, and spray 1% CMC binder inward , make small balls in the ba...

Embodiment 2

[0046] 1. According to the size of the reactor, determine the dosage of calcium hydroxide to be 100Kg, the molar ratio of calcium to phosphorus is 1.45, and determine the dosage of phosphoric acid to be 60L;

[0047] 2. Add 500L water into the reactor, heat to 90°, and keep the water temperature;

[0048] 3. Weigh 100Kg of calcium hydroxide, mix it into a paste with cold water, and stir it into the reaction kettle while adding it, so that the calcium hydroxide suspension is mixed evenly;

[0049] 4. Add phosphoric acid to 180L water to make a solution, add it dropwise to the reaction kettle, stir while dripping, control the dropwise addition for about one hour and twenty minutes, continue stirring, and keep the temperature at 90° for 40 minutes;

[0050] 5. Take out the product, dehydrate, wash, dry, and pulverize to obtain hydroxyapatite powder;

[0051] 6. Add 10% urea by mass percentage and 30% bentonite to 60% hydroxyapatite powder by mass and mix evenly, and spray 1% wat...

Embodiment 3

[0055] 1. According to the size of the reactor, determine the dosage of calcium hydroxide as 100Kg, take the molar ratio of calcium and phosphorus as 1.55, and determine the dosage of phosphoric acid as 55L;

[0056] 2. Add 500L water to the reactor, heat to 80°, and keep the water temperature;

[0057] 3. Weigh 100Kg of calcium hydroxide, mix it into a paste with cold water, and stir it into the reaction kettle while adding it, so that the calcium hydroxide suspension is mixed evenly;

[0058] 4. Add phosphoric acid to 165L water to make a solution, add dropwise to the reaction kettle, stir while dripping, control the dropwise addition for about one hour and ten minutes, continue stirring, and keep the temperature at 80° for 60 minutes;

[0059] 5. Take out the product, dehydrate, wash, dry, and pulverize to obtain hydroxyapatite powder;

[0060] 6. Add 20% by mass of sodium bicarbonate and 30% by mass of montmorillonite to 50% by mass of hydroxyapatite powder and mix evenly...

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Abstract

The invention discloses a method for producing a filter material for removing fluorine from drinking water. In the method, cheap industrial calcium hydroxide and phosphoric acid are used as raw materials to synthesize hydroxyapatite under normal pressure and at the temperature of below 100 DEG C, the hydroxyapatite is dehydrated, washed, dried and crushed to form hydroxyapatite powder, a pore-forming agent, a forming agent and a binding agent are added into the hydroxyapatite powder to make the hydroxyapatite powder to small spheres with a diameter of 0.5 to 2 millimeters by using a pore-forming process and a ball-forming process, and porous spherical hydroxyapatite fluorine removing filter material is obtained after heating in an oven, drying and setting. The fluorine removing filter material has the characteristics of high capacity, easy regeneration, long service life, smooth water discharge and small resistance. The production method has the characteristics of cheap and easily available raw materials, simple preparation process, simple and easily controllable process parameters, easy large-scale industrial production and easy promotion and application.

Description

technical field [0001] The invention relates to drinking water treatment technology, in particular to a production method of a fluorine-removing filter material for removing excessive fluorine in drinking water. 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, resulting in osteoporosis, bone deformation, and even paralysis and loss of working ability. China is one of the countries with the most severe fluorosis in the world. Except for Shanghai, it spreads all over the country. Currently, the population of villages affected by high fluoride water poisoning is as high as 81.41 million. The "National Rural Drinking Water Safety Project "Eleventh Five-Year" Plan" decided to basically solve the problem of drinking water safety for more than 300 million rural population by 2015. [0003] At present, domestic and foreig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C02F1/58
CPCC01B25/32C04B2235/447C02F2101/14C01B25/385C02F1/281C04B35/447C04B38/00C04B2111/00793C04B2235/3208
Inventor 刘泽山冯莉
Owner JIANGSU YONGGUAN WATER & WASTERWATER EQUIP CO LTD
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