Preparation method of porous material for deeply removing fluorinion in water

Abstract

The invention provides a preparation method of a porous material for deeply removing fluorinions in water, and belongs to the fields of environment engineering and environment materials. The invention is characterized in that the method comprises the following steps: firstly, mixing bentonite, red mud, fly ash and water according to certain proportions, well mixing with a proper amount of polyurethane foam, drying and molding to obtain a blank material of the porous material; secondly, heating the blank material prepared in step one to 1050 DEG C-1200 DEG C according to a certain regime, calcining, maintaining a constant temperature for 1-3 hours, cooling to normal temperature; thirdly, soaking the porous material prepared in step two with a zirconium oxychloride solution with a mass concentration of 2.5%-10.0%, taking the material out and drying; fourthly, spraying ammonia water with a mass concentration of 1%-2% on the porous material obtained in step three; fifthly, washing the porous material obtained in step four, and drying to obtain the porous material for deeply removing fluorinions in water.

Description

Technical field [0001] The invention relates to a preparation method of a porous material for deep removal of fluorine ions in water, belonging to the fields of environmental engineering and environmental materials. Background technique [0002] The deep removal of fluoride ions in water is one of the important tasks to ensure the safety of water quality. The background value of fluoride ions in water quality in many places in my country is relatively high, which poses a certain threat to the health of the people. In addition, some chemical companies need to use hydrofluoric acid or fluoride, and the fluorine content in the discharged wastewater is relatively high. At present, the deep removal methods of fluorine are mainly lime neutralization method, ion exchange method, reverse osmosis and electrodialysis method, alumina method and so on. Among them, the effect of electrodialysis and reverse osmosis is better, but the cost is higher, and there is sewage discharge with hig...

AI Technical Summary

Problems solved by technology

Among them, the effect of electrodialysis and reverse osmosis is better, but the cost is higher, and there is sewage discharge with higher F- concentration. It is difficult to obtain the ideal fluoride ion removal rate by neutralization method and ion exchange method.