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Defluorinating adsorbent and preparation method thereof

A technology of adsorbent and binder, which is applied in the field of preparation of fluoride-removing adsorbent, to achieve the effects of high pore volume, high adsorption capacity and large specific surface area

Active Publication Date: 2013-01-09
北京国中科创环境科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a kind of preparation method for the defluoridation adsorbent particle of drinking water and the defluorination adsorbent particle prepared by this method for the problem existing in above-mentioned prior art, the defluorination adsorbent prepared by the method of the present invention The particles have high strength, will not be broken after long-term use, have small mass loss, no dissolution, no secondary pollution problems, are safe and reliable, and are suitable for long-term use and under the condition of large changes in water flow pressure

Method used

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  • Defluorinating adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 1. Preparation of composite metal oxide powder

[0066] Manganese nitrate, aluminum nitrate and cerium nitrate are dissolved in water to form an aqueous solution in a molar ratio of Mn: Al: Ce=1:4:1;

[0067] While stirring, add ammonia solution dropwise to the above aqueous solution until the pH of the solution is 9.5; let it stand for 24 hours; wash and separate by centrifugal washing with deionized water until the pH of the effluent is nearly neutral; dry the washed product at 100°C to a constant weight, calcined at 400° C. for 2 hours, and ground to obtain a composite metal oxide defluorination adsorbent powder.

[0068] 2. Preparation of adsorbent particles

[0069] Add the fluorine-removing adsorbent powder and the binder polyacrylate emulsion into a coulter mixer and mix evenly to prepare a mixed material, wherein the polyacrylate emulsion has a solid content of 53%, a concentration of 10%, and a viscosity of 800mPa·s , the pH value is 6.0, and the mass ratio o...

Embodiment 2

[0077] 1. Preparation of composite metal oxide powder

[0078] Dissolving ferric chloride, aluminum sulfate and lanthanum nitrate in a molar ratio of Fe: Al: La = 1: 4: 1 to form an aqueous solution, stirring and mixing at room temperature;

[0079] While stirring, add sodium carbonate solution dropwise to the above aqueous solution until the pH of the solution is 9.0, and let it stand for 24 hours; centrifuge and separate with deionized water until the pH of the effluent is nearly neutral; the washed product is stored at 90°C Dried to constant weight, calcined at 500° C. for 3 hours, and ground to obtain composite metal oxide fluorine removal adsorbent powder.

[0080] 2. Preparation of polymer binder

[0081] In a closed container, under the condition that the stirring rate is 150rpm, the polyvinyl formal powder is dissolved in ethanol, and the air bubbles are released after standing, so that the polyvinyl formal glue solution with a mass percentage concentration of 10% is ob...

Embodiment 3

[0088] 1. Preparation of composite metal oxide powder

[0089] Ferric nitrate, aluminum chloride, and cerium sulfate are dissolved in water to form an aqueous solution in a molar ratio of Fe: Al: Ce=1:6:1;

[0090] While stirring, add sodium hydroxide solution dropwise to the above aqueous solution until the pH of the solution is 9.5, and let it stand for 24 hours; centrifuge and separate with deionized water until the pH of the effluent is nearly neutral; the product after washing is at 95°C Dry at 450° C. for 1 hour, and grind to obtain composite metal oxide fluorine-removing adsorbent powder.

[0091] 2. Preparation of polymer binder

[0092] After dissolving polyvinyl alcohol (2499) in water at 95°C, add small molecular carboxylic acid citric acid and stir to carry out esterification reaction to obtain polyvinyl alcohol citrate binder, wherein the esterification reaction temperature is 70°C, the reaction time is 120min, the weight ratio of polyvinyl alcohol (2499) to wat...

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Abstract

The invention provides a defluorinating adsorbent for drinking water, which is a composite metal oxide defluorinating adsorbent and a high polymer material playing a role of adhering absorbent particles. Absorbent powder and a high polymer binder are mixed, extruded, cut and dried to prepare into particles. The defluorinating adsorbent has the characteristics of good ion selectivity, high adsorption capacity, better strength in both dry and wet states, and no crushing or dissolving after being used for a long time.

Description

technical field [0001] The invention relates to a preparation method of a solid adsorbent composition, in particular to a preparation method of an adsorbent for defluoridation of metal oxides in drinking water. Background technique [0002] Fluorine is one of the essential trace elements for the human body. An appropriate amount of fluorine (0.5-1.0 mg / L) can enhance the firmness of bones and have a certain effect on preventing dental caries. However, excessive intake of fluorine will damage human health, lead to fluorosis, dental fluorosis and skeletal fluorosis; severe cases can cause backache and leg pain, joint stiffness, hunchback and even paraplegia; dysfunction, etc. [0003] Fluorosis is one of the most widely distributed endemic diseases in the world. Fluorosis exists in many countries including China. The source of fluoride in the human body is mainly obtained through drinking water and food. Survey statistics show that the fluoride content in drinking water is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/30
Inventor 张昱赵蓓杨敏豆小敏邬晓梅高迎新
Owner 北京国中科创环境科技有限责任公司
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