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A kind of defluoridation agent prepared by fly ash and its defluorination method and application

A technology of defluoridation agent and fly ash, which is applied in the field of environmental restoration, can solve the problems of rapid adsorption performance attenuation, high cost, and fast filtration speed, and achieve excellent adsorption and defluorination performance, less investment in production equipment, and large exchange capacity Effect

Inactive Publication Date: 2016-01-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption method is considered to be a method with good applicability. Commonly used natural filter materials mainly include zeolite, serpentine, coal gangue and coke, etc., but these materials often have problems of varying degrees, such as poor mechanical strength, poor adsorption performance Unfavorable factors such as fast attenuation, short contact time, fast filtration rate, and easy loss, or restrictive factors such as poor water permeability, harsh reaction conditions, and high cost, affect the adsorption effect.

Method used

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  • A kind of defluoridation agent prepared by fly ash and its defluorination method and application
  • A kind of defluoridation agent prepared by fly ash and its defluorination method and application
  • A kind of defluoridation agent prepared by fly ash and its defluorination method and application

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Experimental program
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Effect test

Embodiment 1

[0027] Preparation of product 1:

[0028] Remove the harmful substances contained in the fly ash by acid leaching, leaching at a stirring rate of 85-120r / min under the condition of hydrochloric acid concentration of 18%-25%, slurry ratio of 1:4-1:5, 70°C-80°C 2h~4h, after stopping stirring, stand and age at 15°C~25°C for 2~6h, use filtration method for solid-liquid separation, rinse and dry at 60°C~80°C.

[0029] Preparation of high-efficiency fluoride removal agent:

[0030] The defluorinating agent of the present invention is raw material with product 1, loam, activated carbon, iron powder, and its preparation method is as follows: product 1, loam, activated carbon (the composition of above-mentioned 3 kinds of raw materials see Table 2-4), iron powder with A certain percentage by weight (Table 1) is mixed homogeneously, placed in image 3 The fluorine removal device shown removes fluorine in water, in which the particle size of product 1 is 0.45mm-0.9mm, the particle size...

Embodiment 2

[0044] Determination of operating parameters:

[0045] Adopt the best high-efficiency defluoridation agent formula with the best removal effect obtained in Example 1, with a certain weight percentage of product 131%, activated carbon 31%, loam clay 23%, zero-valent iron powder 15%, and the particle size of product 1 is 0.45. mm ~ 0.9mm, the particle size of activated carbon is 0.15mm ~ 0.45mm, the particle size of sub-clay powder is less than 0.15mm, and the particle size of zero-valent iron powder is greater than 5mm. placed in image 3 The high fluoride water is repaired in the defluoridation device shown. The special fluorine pollution defluorination device of the present invention is a complete set of plexiglass device made of glass glue. From left to right, upside down after inversion, it includes water inlet, water distribution layer, water distribution plate, filter layer, adsorption layer, and water outlet. Layer, water outlet plate, water outlet, water inlet is loca...

Embodiment 3

[0052] Determination of the application method of high-efficiency fluoride removal agent:

[0053] Adopt the best high-efficiency defluoridation agent formula with the best removal effect obtained in Example 1, with a certain weight percentage of product 131%, activated carbon 31%, loam clay 23%, zero-valent iron powder 15%, and the particle size of product 1 is 0.45. mm ~ 0.9mm, the particle size of activated carbon is 0.15mm ~ 0.45mm, the particle size of sub-clay powder is less than 0.15mm, and the particle size of zero-valent iron powder is greater than 5mm. One way of application is: extruding the new mixed adsorbent to a density of 2.4-2.8g / cm 3 Stacking and filling in the first layer of grille to remove fluorine in fluorine-containing water, the filling volume is 10×10×45cm 3 (The thickness of the reaction medium is 10 cm). Another application of the high-efficiency defluoridation agent prepared by using the new type of fly ash is as follows: the product 1, loam, acti...

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Abstract

The invention discloses a fluorine removal agent prepared from fly ash, a fluorine removal method and application of the fluorine removal agent. A certain proportion of iron powder and activated carbon is mixed in solid waste or materials, such as fly ash products and clay containing different active aluminum oxide fluorine removal adsorption materials, iron oxide or hydroxide with the relatively high surface activity is introduced, so that the anion exchange capacity and the fluorine removal adsorption capacity are greatly improved, and the limitation of relatively high cost spent on industrial independent using treatment of the iron oxide is reduced. Compared with a fluorine removal material, the fluorine removal agent has the advantages that the preparation complexity is not improved; the removal efficiency and the preparation cost are both taken into consideration; the fluorine removal process is implemented in multiple ways such as adsorption, complexing, chelating and ion exchange; the fluorine removal agent is simple in process and easy to operate; relevant indexes can meet relevant national water quality standards for drinking water; the fluorine removal agent is particularly applicable to the conventional remediation technology process.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and in particular relates to a high-efficiency defluorination adsorption material prepared by using fly ash and its application. [0002] The invention also relates to a method for repairing high-fluorine water by using an in-situ repair device. Background technique [0003] Both surface water and groundwater on the earth contain fluoride ions to varying degrees, and the fluoride mainly comes from minerals, rocks, soil, etc. in nature. Water with a fluorine content greater than 1.0mg / L is high-fluorine water. Due to the influence of geological structure, environment, geography and other factors, the fluorine content of groundwater in some areas of my country exceeds the standard, mainly distributed in the northeast, northwest, north China and the Huanghuaihai Plain. Even as high as 20mg / L, the content in the body of humans and animals exceeds the standard after drinking, causing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/12B01J20/30C02F1/28C02F1/58
Inventor 王姣李坦夫周春财刘桂建
Owner UNIV OF SCI & TECH OF CHINA
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