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Preparation method of modified clay mineral material for purification of fluorine-containing sewage

A clay mineral and sewage purification technology, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high cost of external aluminum sources, unfavorable occurrence sites of activated alumina, etc., and achieve the production cycle Short, reduce the threat to the health of equipment and related personnel, and reduce the effect of potential environmental hazards

Inactive Publication Date: 2016-04-20
YANGTZE RIVER WATER RESOURCES PROTECTION SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is aimed at the existing F in the prior art - Deficiencies in the preparation and use of adsorbents: the cost of external aluminum sources is too high, and the occurrence sites of activated alumina are not conducive to F - The present situation of adsorption aims to provide a preparation method of a modified clay mineral material for purification of fluorine-containing sewage with simple process, short preparation period, low energy consumption, low pollution, low cost and easy industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Add 1 g of montmorillonite to 0.5 mL of 15% sodium bisulfate solution by mass percentage, and stir at room temperature for 1 hour;

[0024] 2) Place the mixed sample obtained above in a muffle furnace, and fully calcinate it at 300°C for 3 hours;

[0025] 3) Add the obtained solid into water, adjust its pH value to 8 with sodium hydroxide solution, place it in a muffle furnace after sufficient centrifugation, raise the temperature to 200° C., and fully calcinate for 3 hours. The modified clay mineral material used for purifying fluorine-containing sewage can be obtained.

[0026] The modified montmorillonite material with high fluoride ion removal ability obtained in this embodiment is subjected to F - Adsorption experiment, when the initial pH=5.5, its maximum Langmuir adsorption capacity can reach 8.7mg / g, F - The removal rate was 95.3%.

Embodiment 2

[0028] 1) Add 1 g of montmorillonite to 4.0 mL of 30% sodium bisulfate solution by mass percentage, and stir at room temperature for 3 hours;

[0029] 2) Place the mixed sample obtained above in a muffle furnace and fully calcinate at 500°C for 1.5 hours;

[0030] 3) Add the obtained solid into water, use sodium hydroxide solution to adjust its pH value to 9, place it in a muffle furnace after sufficient centrifugation, raise the temperature to 500° C., and fully calcinate for 3 hours. The modified clay mineral material used for purifying fluorine-containing sewage can be obtained.

[0031] The modified montmorillonite material with high fluoride ion removal ability obtained in this embodiment is subjected to F - Adsorption experiment, when the initial pH=5.5, its maximum Langmuir adsorption capacity can reach 9.8mg / g, F - The removal rate was 96.5%.

Embodiment 3

[0033] 1) Add 1 g of montmorillonite to 4.0 mL of 30% sodium bisulfate solution by mass percentage, and stir at room temperature for 3 hours;

[0034] 2) Place the mixed sample obtained above in a muffle furnace and fully calcinate at 500°C for 3 hours;

[0035] 3) Add the obtained solid into water, use sodium hydroxide solution to adjust its pH value to 8.5, place it in a muffle furnace after sufficient centrifugation, raise the temperature to 300° C., and fully calcinate for 3 hours. The modified clay mineral material used for purifying fluorine-containing sewage can be obtained.

[0036] The modified montmorillonite material with high fluoride ion removal ability obtained in this embodiment is subjected to F - Adsorption experiment, when the initial pH=6.0, its maximum Langmuir adsorption capacity can reach 13.8mg / g, F - The removal rate was 98.5%.

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Abstract

A preparation method of a modified clay mineral material for purification of fluorine-containing sewage comprises steps as follows: a clay mineral is added to a sodium hydrogen sulfate solution and stirred at the room temperature for 1-3 h; the mixture is placed in a muffle furnace to be calcined at the temperature of 300-500 DEG C for 1.5-3 h; calcined solids are added to water, the pH value is adjusted to range from 8 to 9 by the aid of a strong base solution, and the mixture is placed into the muffle furnace after centrifugation, heated to the temperature of 200-500 DEG C and calcined for 3 h; the modified clay mineral material having the capability of purifying the high-fluorine-ion sewage is obtained. According to the method, alumina in the clay mineral is corroded by the aid of a strong acid and weak base salt solution, separated from the structure of the clay mineral and loaded on an amorphous silica surface to serve as an absorption activity center; the modified clay mineral material is obtained through base treatment and calcining activation. The modified clay mineral material prepared with the method has good adsorption capability for F<-> in the sewage, and the removal rate can be higher than 95.3%. According to the method, the technology is simple, the preparation period is short, the energy consumption is low, the pollution is low, the cost is low, and industrial production is easy.

Description

technical field [0001] The invention relates to a preparation method of a modified clay mineral material, in particular to a preparation method of a modified clay mineral material used for purifying fluorine-containing sewage. Background technique [0002] Fluorine is one of the trace elements necessary for the human body. However, excessive intake of fluorine will cause great harm to the human body: long-term drinking of water with a fluoride concentration higher than 1mg / L can easily cause dental fluorosis; long-term drinking of water with a fluoride concentration higher than 3mg / L can cause bone fluorosis Diseases (caused by the imbalance of calcium and phosphorus metabolism in the body), and even induce the occurrence of tumors, which seriously threaten human health. In addition, excessive fluoride ion content is also harmful to plant growth. Therefore, the effective removal of high-concentration fluoride ions in water is an important task in the field of environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F101/14
CPCB01J20/103B01J20/12B01J2220/4806C02F1/288C02F2101/14
Inventor 闫峰陵罗小勇樊皓刘扬扬王中敏
Owner YANGTZE RIVER WATER RESOURCES PROTECTION SCI RES INST
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