Defluorination adsorbent and preparation method thereof

A technology of adsorbent and exchange resin, which is applied in the field of fluorine removal adsorbent and its preparation, can solve the problems of active component loss, difficult industrial application, poor mechanical strength, etc., and achieve faster adsorption speed, stable performance and strong mechanical strength. Effect

Inactive Publication Date: 2017-10-24
JIANGSU HELPER FUNCTIONAL MATERIALS
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AI Technical Summary

Problems solved by technology

[0004] Activated alumina is the most widely used defluorination agent, but its adsorption capacity is low. In order to increase the adsorption capacity of alumina, a lanthanum-loaded activated alumina defluorination agent has appeared. Although this defluorination agent has a higher adsorption capacity than activated alumina The adsorption capacity has increased, but the adaptability to pH is narrow, and the fluoride removal efficiency is only high when pH=5-7
In addition, there is a calcium-aluminum-lanthanum-based composite defluorination material. Although this defluorination agent has a high saturation adsorption capacity for fluorine, it is a powder material, and there is a serious problem in practical applications, that is, when it is used in a fixed bed The drop is too large, the mechanical strength is poor, and the loss of active components is serious, which makes it difficult for industrial application

Method used

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  • Defluorination adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Salt solution preparation: 8.7g of lanthanum chloride heptahydrate and 12.15g of aluminum chloride hexahydrate were added to 120ml of deionized aqueous solution containing 30ml of ethanol solution, and ultrasonically dissolved to obtain a clear solution.

[0038] (2) Reaction: Add the clear solution obtained in step (1) into a reactor equipped with a stirring and temperature control device, add 20ml of anion exchange resin D201, and stir at a temperature of 60° C. for 7 hours. Filter out the resin, add 15% sodium hydroxide solution, and stir for 4h. Filter out the resin and set aside.

[0039] (3) Add lithium salt: prepare 10.5% lithium chloride solution, add the resin filtered out in step (2), and crystallize in an oven at 60° C. for 5 hours.

[0040] (4) Post-treatment: filter out the resin treated in step (3), and wash with water to obtain the fluorine-removing adsorbent.

[0041] As a comparison, lithium aluminum lanthanum hydrotalcite was prepared by co-preci...

Embodiment 2

[0045] (1) Salt solution preparation: Weigh 9.8g of lanthanum nitrate hexahydrate and 28.1g of aluminum nitrate nonahydrate and add them to 260ml of deionized aqueous solution containing 50ml of ethanol solution, ultrasonically dissolve them to obtain a clear solution.

[0046] (2) Reaction: Add the clear solution obtained in step (1) into a reactor equipped with a stirring and temperature control device, add 40 ml of anion exchange resin D201, and stir at a temperature of 80° C. for 10 h. Filter out the resin, add 20% sodium hydroxide solution, and stir for 5h. Filter out the resin and set aside.

[0047] (3) Add lithium salt: prepare 12% lithium salt solution, add the resin filtered out in step (2), and crystallize in an oven at 80° C. for 4 hours.

[0048] (4) Post-treatment: filter out the resin treated in step (3), and wash with water to obtain the fluorine-removing adsorbent.

[0049] Test its adsorption capacity according to the method of Example 1.

Embodiment 3

[0051] (1) Salt solution preparation: 12.7g of lanthanum chloride heptahydrate and 15.15g of aluminum chloride hexahydrate were added to 120ml of deionized aqueous solution containing 30ml of ethanol solution, and ultrasonically dissolved to obtain a clear solution.

[0052] (2) Reaction: Add the clear solution obtained in step (1) into a reactor equipped with a stirring and temperature control device, add 15ml of anion exchange resin D202, and stir at a temperature of 80° C. for 4 hours. Filter out the resin, add 12% sodium hydroxide solution, and stir for 3h. Filter out the resin and set aside.

[0053] (3) Add lithium salt: prepare 12.5% ​​lithium chloride solution, add the resin filtered out in step (2), and crystallize in an oven at 60° C. for 5 hours.

[0054] (4) Post-treatment: filter out the resin treated in step (3), and wash with water to obtain the fluorine-removing adsorbent.

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Abstract

The invention relates to a defluorination adsorbent which comprises anion exchange resin and an inorganic defluorination adsorbent, wherein the inorganic defluorination adsorbent is in a layered crystal structure, deposited in the ducts of the anion exchange resin, and formed by a hydroxide of lithium, a hydroxide of aluminum and a hydroxide of lanthanum. The invention further discloses a preparation method of the defluorination adsorbent. The preparation method comprises the following steps that lanthanum salt and aluminum slat are dissolved in water containing ethyl alcohol, and a mixed solution is obtained; the anion exchange resin is added to the mixed solution, reaction is performed at the temperature of 60-80 DEG C, and then a strong caustic water solution is added for soaking; the processed anion exchange resin is added to the water solution of lithium salt, crystallization is performed at the temperature of 50-90 DEG C, and the defluorination adsorbent is obtained. According to the defluorination adsorbent, the absorption quantity is large, the absorption speed is high, the defluorination efficiency is high, and the defluorination adsorbent can be reused; the preparation method of the defluorination adsorbent is mild in condition, simple in technology and suitable for industrialization batch production.

Description

technical field [0001] The invention relates to the field of materials, in particular to a fluorine-removing adsorbent and a preparation method thereof. Background technique [0002] my country's high-fluoride groundwater is widely distributed throughout 27 provinces and municipal autonomous regions, especially in North China and Northwest China. Long-term drinking of water with excessive fluoride may lead to diseases such as dental fluorosis, bone fluorosis, and senile dementia. The World Health Organization recommends that the concentration of fluoride in drinking water not exceed 1.5mg / L, and the current drinking water standard in my country stipulates that fluoride does not exceed 1.0mg / L, so people have developed a variety of methods to remove fluoride in water. [0003] The current defluoridation methods mainly include precipitation method, electrochemical method, membrane separation method, ion exchange method and adsorption method. These methods have many limitatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28B01J20/30C02F101/14
CPCB01J20/06B01J20/041B01J20/08B01J20/26C02F1/288C02F2101/14
Inventor 蔡建国石洪雁付晓微
Owner JIANGSU HELPER FUNCTIONAL MATERIALS
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