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Fluorine adsorbent and method for recycling 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 fluorine-containing wastewater cannot be treated until it reaches the standard discharge, achieve good fluoride removal effect, and improve acid resistance ability, the effect of increasing the adsorption capacity

Inactive Publication Date: 2018-12-14
长沙华盛新材料科技有限责任公司
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  • Abstract
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  • 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

[0026] Take 5m3 of zinc leaching solution containing F 92.33mg / L, H2SO4 158.3g / L, and Zn 46.7g / L, and use titanium, zirconium, barium, silicon The mixed oxide hydrate is used as the adsorbent, and the adsorbent is added according to the solid-liquid ratio of 1:250g / L, stirred and adsorbed at room temperature for 0.5h, and filtered to obtain the defluoridated liquid and the loaded adsorbent. After defluorination, the concentration of F in the solution is reduced to 0.6mg / L. In the process of zinc electrolysis, the electrolyte should contain less than 50mg / L of F, the defluorination rate is 99.4%, and the adsorption capacity of the adsorbent for F is 23mg / g. . The obtained loaded adsorbent was first stirred into water according to the 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. The regenerated adsorbent...

Embodiment 2

[0028] Get battery-grade high-purity manganese sulfate plant pH is 5 and contains F 1700mg / L acid etching waste liquid 3L, with [Ti+Zr+Mg+Sn+Ca] / [C] molar ratio is 0 titanium, tin, Zirconium, calcium, and silicon mixed oxides are used as adsorbents, and the adsorbent is added at a solid-to-liquid ratio of 1:8, stirred and adsorbed at room temperature for 20 minutes, and filtered to obtain the defluorinated liquid and loaded adsorbent. The concentration of F in the liquid after defluorination is 8mg / L, and the defluorination rate is 99.5%.

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Abstract

The invention discloses a fluorine adsorbent. The adsorbent is a mixture composed of an oxide of a metal element Me, a hydrate of the oxide and activated carbon, wherein the metal element Me is selected from an element capable of forming an insoluble complex with fluorine. A method for removing and recycling fluorine from fluorine-containing water comprises the following steps: step 1, adsorbing and enriching fluorine; step 2, regenerating an adsorbent; and step 3, producing sodium fluoride. According to the invention, the adsorption capacity of the adsorbent to F is remarkably increased, andacid resistance of the adsorbent is greatly improved. The mixed oxide adsorbent containing activated carbon is adopted; the adsorbent can be used for defluorination of neutral and weakly acidic fluorine-containing groundwater, so that the groundwater achieves a drinking standard; the adsorbent can also be used for deep purification and standard emission of high-acidity fluorine-containing industrial wastewater; and the fluorine in water can be recycled in the form of a sodium fluoride product, so that waste is changed into wealth. The method has the advantages of simple process, simple and convenient operation, cleanness and environment friendliness, good fluorine removal effect and the like, and is suitable for industrial application of removing and recycling fluorine in fluorine-containing water.

Description

technical field [0001] The invention relates to the technical fields of chemical industry, metallurgy, environmental protection and drinking water, in particular to a fluorine adsorbent and a method for removing and recovering fluorine from fluorine-containing 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 o...

Claims

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Application Information

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IPC IPC(8): B01J20/20C02F1/28C02F101/12
CPCB01J20/06B01J20/20C02F1/283C02F2101/12
Inventor 赵宝平
Owner 长沙华盛新材料科技有限责任公司
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