Compound bentonite for removing fluorine from water and preparation method thereof

A technology of bentonite and calcium-based bentonite, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of high price, bentonite content not higher than 70%, low adsorption performance, etc., and achieve low production cost , less synthetic steps, easy to control the effect

Inactive Publication Date: 2009-10-28
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide composite bentonite and its preparation method for removing fluorine from water, so as to overcome the disadvantages of high price and low adsorption performance of the adsorption materials used for removing fluorine from water in the prior art At the same time, it also overcomes the disadvantage that the existing polyacrylamide / bentonite compound is only used as a water-absorbing agent, and the content of bentonite in it is not higher than 70%.

Method used

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  • Compound bentonite for removing fluorine from water and preparation method thereof
  • Compound bentonite for removing fluorine from water and preparation method thereof
  • Compound bentonite for removing fluorine from water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step, the preparation of purified calcium-based bentonite

[0028] Add commercially available calcium-based bentonite mineral powder and tap water at a mass ratio of 1:6-7, stir for 20-40 minutes, let stand for 20-30 hours, then stir for 10-20 minutes, then add tap water or repeat the preparation. The supernatant taken out during the first preparation is prepared into a mass ratio of calcium-based bentonite slag: water=1: 9~11 feed liquid, continue to stir for 9~11 minutes, then let stand to settle for 3~5 hours, and take out the supernatant The liquid is then used for the next preparation of the feed liquid, and the upper layer of fine soil is taken out from the sediment, and the fine soil is dried in an oven at 100°C until the quality of the fine soil remains unchanged, then crushed, and passed through a 200-mesh sieve. Purified calcium-based bentonite;

[0029] figure 1In order to purify the X-ray fluorescence diffraction pattern of calcium-based bentonit...

Embodiment 2

[0037] The first step, the preparation of purified calcium-based bentonite

[0038] With the first step of embodiment 1;

[0039] The second step, solution polymerization

[0040] Weigh 8.00 g of the purified calcium-based bentonite obtained in the first step and 2.00 g of commercially available monomeric acrylamide, mix them and dissolve them in 25 mL of deionized water to prepare a mixed solution, stir at room temperature for 1 hour, mix well and then heat up to 70°C, then add 0.0096g initiator azobisisobutyronitrile and 0.50g crosslinking agent formaldehyde solution, continue to stir until the solution gradually becomes viscous and polymerizes and solidifies, and the reaction is completed, then maintain a constant temperature of 70°C, from The reaction time of reaction cessation is 2 hours, and the obtained wet solid phase product;

[0041] The third step is vacuum drying to obtain a composite bentonite product for removing fluorine from water

[0042] The wet solid phas...

Embodiment 3

[0045] The first step, the preparation of purified calcium-based bentonite

[0046] With the first step of embodiment 1;

[0047] The second step, solution polymerization

[0048] Weigh 9.00 g of the purified calcium-based bentonite obtained in the first step and 1.00 g of commercially available monomeric acrylamide, mix and dissolve in 25 mL of deionized water to prepare a mixed solution, stir at room temperature for 1 hour, mix well and then heat up to 70°C, then add 0.0096g initiator azobisisobutyronitrile and 0.50g crosslinking agent formaldehyde solution, continue to stir until the solution gradually becomes viscous and polymerizes and solidifies, and the reaction is completed, then maintain a constant temperature of 70°C, from The reaction time of reaction stop is 2.5 hours, the wet solid phase product that makes;

[0049] The third step is vacuum drying to obtain a composite bentonite product for removing fluorine from water

[0050] The wet solid phase product obtai...

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Abstract

The invention relates to compound bentonite for removing fluorine from water and a preparation method thereof, which relates to the water treating field by the absorption method. The compound bentonite consists of calcium-based bentonite and polyacry lamide which is polymerized on the calcium-based bentonite, wherein the polyacry lamide accounts for 10 wt percent-25 wt percent of the total mass percentage and the calcium-based bentonite 75 wt percent-90 wt percent thereof. The polyacry lamide is formed by the solution polymerization of acrylamide monomer acted by polymerization initiator zaodiisobutyronitrile and cross linker formaldehyde. The invention overcomes the weaknesses such as the high price and low absorption property of the absorbing materials removing fluorine from water in prior art and simultaneously overcomes the weaknesses that the existing polyacry lamide / bentonite compound is used only as water absorbent and furthermore the bentonite content is not higher than 70%.

Description

technical field [0001] The technical scheme of the invention relates to the technical field of water treatment by adsorption method, in particular to composite bentonite for removing fluorine from water and a preparation method thereof. Background technique [0002] Fluorine is one of the essential trace elements for the human body. When the fluorine content in drinking water is insufficient, it is easy to suffer from dental caries; but if you drink high-fluorine water for a long time, it will cause tooth deterioration and enamel loss, and it will cause bone sclerosis or bone loss. Loosing, bone deformation, and even paralysis make people lose their ability to work. my country is one of the countries in the world where drinking-water endemic fluorosis is most prevalent and harmful. my country's drinking water standard stipulates that the appropriate fluorine content in drinking water is 0.5-1.0mg / L; and according to the national wastewater discharge standard, it is required...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/26B01J20/30C02F1/28C02F1/58C02F101/14
Inventor 曹吉林张会然陈学青高长鸿
Owner HEBEI UNIV OF TECH
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