A kind of preparation method of fluorine removal adsorption material based on magnesite

Abstract

The invention provides a method for preparing a defluorination material with a three-dimensional through hole structure by taking magnesite as a raw material. The method comprises the following steps: mixing ground and sieved natural magnesite and a biomass additive at a certain ratio, and uniformly dispersing a solution containing a binding agent to form slurry; filling the slurry into through hole polyurethane sponge foams; and rolling, molding, drying, degreasing and calcining to obtain a defluorination adsorption material with the three-dimensional through hole structure. The defluorination adsorption material keeps a honeycomb pore structure of the polyurethane sponge foams, and a plurality of micro-pores, which are remained by volatilizing organic matters including the binding agent, polyurethane sponge and the like, are formed in the surface, so that the specific surface area is large. Furthermore, the material sufficiently utilizes characteristics of magnesium-rich ingredients of natural magnesite; degreasing and active calcining are carried out at the same time; and the adsorption material which takes active magnesium oxide as the main ingredient is obtained and can be widely applied to purification treatment of fluorine-containing sewage. The preparation method of the defluorination adsorption material is simple, the raw material cost and the equipment cost are low, the operation is easy and the industrial large-scale production is easy to realize.

Description

technical field [0001] The invention relates to a preparation method of a fluorine removal adsorption material based on magnesite, and belongs to the technical field of preparation of water treatment materials. Background technique [0002] Fluorine is one of the essential trace elements for the human body, widely exists in nature, and plays an important role in maintaining normal physiological activities of the human body. Appropriate intake of fluorine can make human bones and teeth firm and reduce the occurrence of dental caries. However, excessive intake of fluoride can lead to fluorosis, mainly manifested as dental fluorosis and skeletal fluorosis. At present, the methods of fluorine-containing water treatment mainly include adsorption method, coagulation-precipitation method, ion exchange method, reverse osmosis method, membrane exchange method, electrodialysis method and electrocoagulation method, etc. These methods have their own characteristics, among which adsorpt...

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Problems solved by technology

At present, activated magnesia is used as the adsorption material for fluorine removal, which is mainly prepared by high-temperature calcination of magnesia and microwave heating. The obtained material is a fine powder, and it is easy to generate large bed resistance during the adsorption process.

For example, the patent CNI03816854A uses magnesium oxide as a raw material to obtain activated magnesium oxide defluoridation adsorption powder through high-temperature roasting and surface modification. The cost of the obtained material increases accordingly, and the powder needs to be filtered after adsorption, which increases the process.

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