Process for preparing fluorine reducing ion sieve of aquatic body

Abstract

A process for preparing the ionic sieve used to de-fluorinate water includes such steps as dripping sulfuric acid to the aqueous solution of sodium silicate while stirring to generate silicate acid gel, ageing to form porous skeleton structure, dripping the aqueous solution of zirconium oxychloride or cerium sulfate to said gel while stirring to obtain de-fluorinating gel, filtering for dewatering, washing, baking, calcining and holding the temp for a certain time. Its advantage is high adsorptive speed and capacity.

Description

technical field [0001] The invention relates to a method for preparing a fluorine-reducing ion sieve for water bodies, and belongs to the field of inorganic fluoride-removing materials. Background technique [0002] At present, the methods for removing fluoride from fluorine-containing water mainly include adsorption method, electrocoagulation method, reverse osmosis method, ion exchange method and coagulation precipitation method. Among them, the ion exchange method is expensive and has strict requirements on water quality; the electrocoagulation method has complicated devices and consumes a lot of power; and the fluorine content of the water treated by the chemical precipitation method and the coagulation sedimentation method is difficult to reach the index of 1 mg / L. The amount of sludge is large; due to the rise of membrane technology represented by reverse osmosis, the practice of applying reverse osmosis and electrodialysis technology to ...

AI Technical Summary

Problems solved by technology

Among them, the ion exchange method is expensive and has strict requirements on water quality; the electrocoagulation method has complicated devices and consumes a lot of power; and the fluorine content of the water treated by the chemical precipitation method and the coagulation sedimentation method is difficult to reach the index of 1 mg / L. The amount of sludge is large; due to the rise of membrane technology represented by reverse osmosis, the practice of applying reverse osmosis and electrodialysis technology to fluorine-containing water treatment is increasing day by day, but due to the characteristics of reverse osmosis and electroosmosis, it does not really apply The fluorine element in the water is removed from the water, but only concentrated into the part of the water that is discharged. This is just a contradictory transfer, and it only provides qualified drinking water one-sidedly.

However, fluorine still exists in water bodies, and the problem of fluorine pollution in water has not been completely solved, and the possibility of causing harm to people still remains.

If further consideration is given to the consumption of electric energy and the waste of discharged waste water, its value may be negative

Especially in areas with high fluorine water in my country, generally water-scarce areas and areas with relatively backward economy, it is unreasonable and uneconomical to use membrane technology characterized by desalination to treat fluorine-containing drinking water

The most widely used adsorption method to remove fluoride is the activated alumina method. This method has a low saturated adsorption capacity when the fluoride ion content in the water body is 1mg / L, and there is a possibility that the dissolved aluminum ions may affect human health.