Fluorine ion adsorbent with high adsorbing capacity and preparation method thereof

A fluoride ion and adsorbent technology, which is applied in the field of high adsorption capacity fluoride ion adsorbent and its preparation, can solve the problems of difficult control, complicated operation, long process, etc., and achieves a short production cycle, simple operation and high adsorption capacity. Effect

Inactive Publication Date: 2017-07-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing nepheline synthesis method has a long process, complicated operation, long time-consuming and difficult to control

Method used

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  • Fluorine ion adsorbent with high adsorbing capacity and preparation method thereof
  • Fluorine ion adsorbent with high adsorbing capacity and preparation method thereof
  • Fluorine ion adsorbent with high adsorbing capacity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Kaolin is purified by physical methods (washing method or re-election method or flotation method), and 4g of purified kaolin minerals are weighed (see XRD analysis and scanning electron microscope photos for figure 1 and figure 2 ), the content of kaolinite in this kaolin mineral is greater than 95%, and the particle size distribution is 15-20 μm. It was placed in a high-pressure reactor, and then 100 mL of deionized water and 4 g of sodium hydroxide powder were added to react for 2 hours at 240 ° C. During the reaction, the stirring speed was 1000 rpm until the hydrothermal reaction was completed. Subsequently, the solid-liquid mixture after the reaction is subjected to solid-liquid separation by means of suction filtration. The separated solid was added to deionized water to wash immediately, and the washing temperature was 90° C., and the washing was repeated three times. The washed product was placed in a 60°C environment until it was completely dry, and the XRD ...

Embodiment 2

[0030] Kaolin was purified by physical method (washing method or re-election method or flotation method), and 4g of kaolin mineral (same as that used in Example 1) was weighed. It was placed in a high-pressure reactor, and then 100 mL of deionized water and 4 g of sodium hydroxide powder were added to react for 1 h at 260 ° C. During the reaction, the stirring speed was 900 rpm until the hydrothermal reaction was completed. Subsequently, the reacted solid-liquid mixture is subjected to solid-liquid separation by centrifugation. The separated solid was then washed with deionized water at a temperature of 95° C., and the washing was repeated three times. The washed product was placed in an environment of 70 °C until it was completely dry, and finally a nepheline-type adsorbent sample was obtained. The specific surface area of ​​the nepheline-type adsorbent material was 18.5m 2 / g. The main chemical composition of the fluoride ion adsorbent is Al 2 o 3 , SiO 2 , Na 2 O and ...

Embodiment 3

[0032] Kaolin was purified by physical method (washing method or re-election method or flotation method), and 4g of kaolin mineral (same as that used in Example 1) was weighed. It was placed in a high-pressure reactor, and then 100 mL of deionized water and 4 g of sodium hydroxide powder were added, and reacted at 220 ° C for 3 h. During the reaction, the stirring speed was 500 rpm until the hydrothermal reaction was completed. Subsequently, the solid-liquid mixture after the reaction is subjected to solid-liquid separation by means of pressure filtration. The separated solid was then washed with deionized water at a temperature of 90° C., and the washing was repeated four times. The washed product is placed in an environment of 80°C until it is completely dry, and finally a nepheline-type adsorbent sample is obtained. The specific surface area of ​​the nepheline-type adsorbent material is 15.2m 2 / g. The main chemical composition of the fluoride ion adsorbent is Al 2 o 3 ...

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Abstract

The invention relates to a fluorine ion adsorbent with high adsorbing capacity and a preparation method thereof. The preparation method comprises the following steps of mixing kaolin, sodium hydroxide and deionized water, putting into a high-pressure reaction kettle, stirring, and performing hydrothermal reaction at high temperature; filtering the solid and liquid mixture after reacting, and using deionized water to wash the solid phase after filtering; drying the washing product at the temperature no higher than 80 DEG C, until the water is completely removed. The prepared fluorine ion adsorbent is a nepheline type fluorine ion adsorbing material; the main chemical components of the fluorine ion adsorbent are Al2O3, SiO2, Na2O and H2O; the fluorine ion adsorbent is in a hexagonal column shape, the adsorbing capacity to fluorine ions is more than 100mg / g, and the adsorbing property is excellent. The nepheline type fluorine ion adsorbing material has the advantages that the preparation technology is simple, the production cycle is short, the controllability is strong, and the nepheline type fluorine ion adsorbing material is suitable for large-scale industrialized production.

Description

technical field [0001] The invention belongs to the technical field of adsorbent materials, and in particular relates to a fluoride ion adsorbent with high adsorption capacity and a preparation method thereof. Background technique [0002] Fluoride ion is one of the trace elements needed by the human body, and an appropriate amount of fluoride intake (less than 1.5mg / L) is beneficial to strengthen teeth and bones. However, when the intake is too high, it may cause endemic fluorosis, mental decline, delayed growth and development, paralysis and carcinogenicity, cranial nerve disorders, renal function damage, infertility and other health problems. [0003] The main way for the human body to absorb fluoride is from drinking water. Natural water bodies (including groundwater) contain a certain amount of fluoride ions. According to the reference standard of the World Health Organization (WHO), the concentration of fluoride ions in drinking water should not exceed 1.5 mg / L. Accor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12C02F1/28B01J20/30C02F101/14
CPCB01J20/12C02F1/281C02F2101/14
Inventor 刘琨王浩冯其明唐学昆
Owner CENT SOUTH UNIV
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