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Preparation method of polyaluminum chloride/hydroxyapatite copolymer material

A technology of hydroxyapatite and polyaluminum chloride is applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., and can solve the problems of low fluorine removal capacity, easily excessive aluminum content, and large specific surface area, etc. Achieve high fluorine removal capacity, long material life, and simple use.

Active Publication Date: 2016-08-24
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] Polyaluminum chloride is a commonly used flocculant in the water treatment industry, but in the application of drinking water, it is necessary to pay attention to the problem that the aluminum content is easy to exceed the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Using crystalline aluminum chloride as raw material, weigh 800g of uniformly ground crystalline aluminum chloride into the crucible, preheat the muffle furnace, and control the temperature in the furnace to be 250 ℃, put the porcelain crucible into the furnace for roasting , stirring once every 5min, roasting for 30min;

[0030] 2. Add 400 mL of water into the crucible, stir evenly, and the sample is polymerized to obtain a viscous resinous polyaluminum chloride semi-finished product;

[0031] 3. Using calcium hydroxide and phosphoric acid as raw materials, determine the dosage of calcium hydroxide and phosphoric acid according to the molar ratio of calcium to phosphorus of 1.45-1.75, add 500 mL of water to the reactor, heat to 60 ° C, and keep the water temperature;

[0032] 4. Weigh 125g calcium hydroxide into a paste with cold water, add it to the reactor, stir evenly, and obtain a viscous resinous polyaluminum chloride semi-finished product;

[0033] 5. Add 100g...

Embodiment 2

[0040] 1. Using crystalline aluminum chloride as raw material, weigh 1000g of uniformly ground crystalline aluminum chloride into the crucible, preheat the muffle furnace, and when the temperature in the furnace is controlled to be 290 °C, put the porcelain crucible into the furnace for roasting , stirring once every 5min, roasting for 30min;

[0041] 2. Add 500 mL of water to the crucible, stir evenly, and the sample is polymerized to obtain a viscous resinous polyaluminum chloride semi-finished product;

[0042] 3. Using calcium hydroxide and phosphoric acid as raw materials, determine the dosage of calcium hydroxide and phosphoric acid according to the molar ratio of calcium to phosphorus of 1.45-1.75; add 500 mL of water to the reactor, heat it to 75 ° C, and keep the water temperature;

[0043] 4. Weigh 125g of calcium hydroxide into a paste with cold water, add it to the reactor, and stir evenly;

[0044] 5. Add 100g phosphoric acid to 300g water and stir to make a solu...

Embodiment 3

[0050] 1. Weigh 625g of uniformly ground crystalline aluminum chloride and put it into the crucible. When the temperature in the furnace is controlled to be 200°C, the porcelain crucible is placed in the furnace for calcination, stirred every 6min, and calcined for 20min;

[0051] 2. Add 300 mL of water to the crucible, stir evenly, and the sample polymerizes to form a viscous resinous substance.

[0052] 3. Add 500 mL of water to the reactor, heat it to 90°C, and keep the water temperature;

[0053] 4. Weigh 125g of calcium hydroxide into a paste with cold water, add it to the reactor, and stir evenly;

[0054] 5. Add 100g phosphoric acid to 300g water and stir to make a solution;

[0055] 6. Add the prepared phosphoric acid solution dropwise to the reactor, control the drop rate to be about 200mL / h, and stir while dropping.

[0056] 7. After adding the phosphoric acid solution, add the viscous resinous substance of the PAC semi-finished product;

[0057] 8. Continue stirr...

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Abstract

The invention discloses a preparation method of an aluminum polychloride / hydroxyapatite copolymeric material. The preparation method comprises the following steps of preparing an aluminum polychloride semi-finished product, preparing a hydroxyapatite semi-finished product and preparing the copolymeric material and synthesizing the aluminum polychloride / hydroxyapatite copolymerization network structure material by virtue of a copolymerization method. Compared with the conventional fluorine-removal material, the fluoride removal capacity of the aluminum polychloride / hydroxyapatite copolymeric material is four times that of a single hydroxyapatite fluoride removal filter and is six times that of an active aluminum oxide fluoride removal filter; the network structure of the material facilitates has the effects of facilitating net capturing of aluminum ions and hydroxyapatite powder in a water body, and the problems of excessive aluminum ions and water clarity in the water body are solved; and meanwhile, by polyaluminum chloride active ingredient in the copolymeric material, the continuous regeneration of hydroxyapatite can be promoted and the service life of the material is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a polyaluminum chloride / hydroxyapatite copolymer material, in particular to a preparation method of a polyaluminum chloride / hydroxyapatite copolymer material suitable for removing excess fluorine in drinking water. Background technique [0002] Fluorine is one of the most widely distributed elements on the earth's surface, and the fluorine in the human body mainly comes from drinking water. Fluorosis caused by drinking high fluoride water is a worldwide endemic disease. China is one of the countries with the most serious fluorosis in the world. Except Shanghai, it spreads all over the country. The World Health Organization stipulates that the content of fluorine in drinking water should not exceed 1.5mg / L. Adsorption is the most commonly used method for defluoridation of drinking water at home and abroad. There are many kinds of fluoride removal adsorbents, such as zeolite, clay, activated carbon, acti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/52C02F1/58B01J20/04B01J20/30
Inventor 冯莉刘泽山苗真勇石美邵菊芳
Owner CHINA UNIV OF MINING & TECH
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