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Fluorine adsorbent and method for removing and recovering fluorine from fluorine-containing water

An adsorbent and removal technology, which is applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problems that fluoride-containing wastewater cannot be treated until it reaches the standard discharge, achieves good defluoride effect and improves acid resistance The effect of power and ease of operation

Pending Publication Date: 2018-06-12
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest defect of the fluorosilicate crystallization method is that the fluorine-containing wastewater cannot be treated to meet the discharge standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take F 121.6mg / L, H 2 SO 4 158.3g / L, Zn 46.7g / L zinc leach solution 5m 3 , using the hydrate of titanium, zirconium, barium, and silicon mixed oxides with a molar ratio of [Ti+Zr+Ba] / [Si] of 20 as the adsorbent, adding the adsorbent according to the solid-liquid ratio of 1:2g / L, Stir and adsorb at room temperature for 0.5h, and filter to obtain the defluoridated liquid and loaded adsorbent. After defluorination, the concentration of F in the solution is reduced to 0.4mg / L (the zinc electrolysis process requires the electrolytic solution to contain F<50mg / L), the defluorination rate is 99.4%, and the adsorption capacity of the adsorbent to F is 60.5mg / g. The obtained loaded adsorbent was first stirred into water at a solid-to-liquid ratio of 1:2 g / mL, then potassium carbonate was slowly added to adjust the pH to 8.7, stirred at 70°C for 2 hours, and the regenerated adsorbent and potassium fluoride solution were obtained by filtration. After the regenerated adsorbent ...

Embodiment 2

[0032] Take 3L of acid etching waste liquid containing F 201.8mg / L at a pH of 3.2 from a glass factory, mix it with titanium, tin, calcium, lanthanum, and silicon with a molar ratio of [Ti+Sn+Ca+La] / [Si] of 95 The oxide is used as the adsorbent, and the adsorbent is added according to the solid-to-liquid ratio of 1g / L, stirred and adsorbed at room temperature for 20min, and the defluorinated liquid and the loaded adsorbent are obtained by filtration. The concentration of F in the liquid after defluorination is 0.5mg / L, the defluorination rate is 99.7%, and the adsorption capacity of the adsorbent for F reaches 201.3mg / g.

Embodiment 3

[0034]Use the hydrate of titanium, zirconium, bismuth, silicon mixed oxide that the molar ratio of [Ti+Zr+Ba] / [Si] is 40 as the adsorbent, and treat the groundwater with pH 6.2 containing F 15.3mg / L, the The fluoride-containing groundwater continuously passes through the 5cm-thick adsorbent filter cake, and the contact time between the two is maintained at 1.5min. Three-stage series adsorption is adopted. The concentration of F in the third-stage effluent is ≤0.1mg / L, and the defluorination rate is >99.3%. . When the F concentration in the second-stage effluent rises to 1mg / L, take out the filter cake of the first-stage adsorbent, replace the same amount of blank adsorbent, and switch it to the third stage, the original second stage becomes the first stage , the third stage becomes the second stage, and the adsorption continues. The replaced loaded adsorbent was stirred and added at a solid-to-liquid ratio of 1:4g / mL, then sodium carbonate was slowly added to adjust the pH to...

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PUM

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Abstract

The invention discloses a fluorine adsorbent and a method for removing and recovering fluorine from fluorine-containing water. The adsorbent is mixture comprising metal element Me oxide, Me hydrate and silicon oxide and Me hydrate; the [sigma Me] / [Si] mole ratio of the adsorbent is 0.01-100; metal element Me is selected from elements capable of forming oxyfluoride with fluorine; the applicable pH(potential of hydrogen) range of the adsorbent is 0-7. The fluorine removing recovery method is characterized in that the fluorine-containing water contacts with the adsorbent, fluorine in the water is removed by adsorption, fluorine removing rate reaches 99.3% or more, the load adsorbent obtained by filtration is desorbed by alkali to obtain a regenerated adsorbent and fluorine-containing solution, the regenerated adsorbent is returned to an adsorption process to be reused, sodium-containing reagents are added into fluorine-containing solution to crystallize and separate out sodium fluoride,and crystallization mother liquor obtained by filtration can return to a regenerating process of the load adsorbent to be reused. According to the fluorine adsorbent, the fluorine adsorption rate of the adsorbent is high, the adsorbent is applicable to wide pH value ranges, the F (fluorine) in the water can be reduced to 1mg / L or less and is recovered by sodium fluoride, and waste is changed intowealth. The fluorine adsorbent has the advantages of simple process, simplicity and convenience in operation, cleanness, environmental protection, good fluorine removing effect and the like, and the fluorine adsorbent is suitable for removing, recovering and industrial application of fluorine in the fluorine-containing water.

Description

technical field [0001] The invention discloses a fluorine adsorbent and a method for removing and recovering fluorine from fluorine-containing water, belonging to the technical fields of chemical industry, metallurgy, environmental protection and drinking water. Background technique [0002] Fluorine is a non-metallic chemical element with the chemical symbol F. Fluorine is chemically active and can react with most metals and nonmetals to form compounds. Therefore, fluorine is extremely widely distributed in nature. Fluorine is one of the indispensable trace elements in the human body, and the fluorine needed by the human body can be taken in from the atmosphere, food and water. Appropriate amount of fluorine can help the body to calcify bones and improve bone hardness. Maintaining the fluorine content in the body plays an important role in preventing dental caries and osteoporosis in the elderly, and helping adolescents grow and develop. However, long-term intake of exc...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/06C02F1/28C01D3/02C02F101/14
CPCB01J20/06B01J20/103C01D3/02C02F1/281C02F2101/14C02F2303/16
Inventor 王学文杜艳苹葛奇王明玉王懿
Owner CENT SOUTH UNIV
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