Treatment method for fluorine-containing waste gas

Abstract

The invention provides a treatment method for fluorine-containing waste gas and belongs to the technical field of environmental protection. In the treatment method, an absorption packed washing tower for an alkaline process and an electric demister are combined for use. Part of the gas between electrodes is ionized into positive and negative ions by a corona polar line in the electric demister, and dust and mist dispersing in the gas collide with the electronegative ions to bear negative electricity; and according to the principle that like charges repel, but opposite charges attract, the positive ions move onto the corona polar line, while electrons and the negative ions move to a receiving electrode, so that dust and mist particles bearing the negative electricity also move to the glass fiber reinforced plastic receiving electrode. Compared with the prior art, the treatment method can ensure that the success rate of fluoride is above 96%, and the fluoride can stably reach the discharge standard.

Description

Technical field [0001] The invention is a fluorine-containing waste gas treatment method and a special device for the method, and belongs to the field of environmental protection technology. Background technique [0002] There are two conventional fluorine-containing waste gas treatment methods: dry method and wet method. Dry method refers to the use of metal oxides (such as Al 2 O 3 ), limestone, lime and other methods of absorbing fluoride; this method has the disadvantages of large investment, low absorbent utilization, and difficult to meet pollutant emission standards, and its application range is small. Wet method refers to an absorption method that uses water and alkaline solutions to absorb fluoride, and finally converts pollutants into stable compounds. The advantages of this method are small purification volume and continuous operation; but during operation, due to The water or lye in the absorption equipment absorbs fluoride and is easily discharged into the ambient a...

AI Technical Summary

Problems solved by technology

The dry method refers to the use of metal oxides (such as Al 2 o 3 ), limestone, lime and other methods for adsorbing fluoride; this method has defects such as large investment, low utilization rate of absorbent, difficulty in pollutant discharge, etc., and its application range is small

Wet method refers to the absorption method that uses water and alkaline solution to absorb fluoride, and finally converts pollutants into stable compounds; the advantages of this method are small purification volume and continuous operation; but during operation, due to The water or lye in the absorption equipment absorbs fluoride and is easily discharged into the ambient air through the chimney with the exhaust gas

[0003] Under the requirements of ever-increasing environmental protection standards, in the conventional lye absorption process, the exhaust gas is absorbed with more water mist, acid mist and dust not absorbed by the wet system, and a small amount of pollutants are still discharged to the environment with the exhaust gas , the removal rate of fluoride cannot meet the requirements, and the compliance rate of daily monitoring of fluoride cannot reach more than 96%

[0004] Chinese patent 91109344 discloses a method for treating fluorine-containing waste gas with four absorption towers for treating fluorine-containing waste gas, but this method also occupies a large area

Images