Fluoride solidifying agent for treating fluorine pollution caused by burning coal and preparation method and application method thereof

Abstract

The invention discloses a fluoride solidifying agent for treating fluorine pollution caused by burning coal. The fluoride solidifying agent is prepared by the following steps of respectively weighing calcium magnesium acetate, aluminum sulfate, sodium carbonate and potassium carbonate according to the molar ratio of ca2+, Al3+, Na+ to K+, wherein the molar ratio is 30: 1.5: 3: 2-4.5; evenly mixing the calcium magnesium acetate, the aluminum sulfate, the sodium carbonate and the potassium carbonate; grinding the mixture through a 180 mesh-300 mesh screen; adding water with the weight 6-12 times that of the mixture into the mixture; heating the mixture to the temperature of 70 DEG C-90 DEG C; stirring the mixture for two to six hours; drying the mixture at the temperature of 100 DEG C-120 DEG C; grinding the mixture through the temperature of 70 DEG C-90 DEG C. Compared with the calcium carbonate serving as the traditional fluoride solidifying agent, porosity and specific surface area of the fluoride solidifying agent are increased greatly, fluoride can be solidified effectively during coal burning, and fluoride content in high-temperature smoke is reduced effectively. Compared with the calcium magnesium acetate serving as the fluoride solidifying agent independently, effect in removing fluoride in high-temperature smoke is more remarkable. Furthermore, the preparation method of the fluoride solidifying agent is simple, and raw material price and production cost are low. The method for solidifying fluoride during coal burning by utilizing the fluoride solidifying agent is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution prevention and control, and in particular relates to a fluorine-fixing agent for controlling fluorine pollution caused by coal combustion, a preparation method thereof, and a method for using the fluorine-fixing agent to solidify fluorine during coal combustion. Background technique [0002] Fluorine is a trace element with a relatively high content in coal, mostly in the range of 20-500 mg / kg, with an average value of about 150 mg / kg. In the process of coal combustion, with the increase of combustion temperature, the precipitation rate of fluorine increases gradually. It begins to precipitate at 280 °C, and the precipitation rate is 0.8% at 300 °C. The precipitation rate is 75.8% at 900 °C. 97.3%. Fluoride generates HF and SiF at high temperature 4 、CF 4 and other gaseous pollutants. Some of these pollutants are captured by the dust collector and stored in the fly ash, a very ...

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Problems solved by technology

Some of these pollutants are captured by the dust collector and stored in the fly ash, a very small part remains in the ash, and most of the rest are discharged into the atmosphere, which not only seriously corrodes the boiler and flue gas purification equipment, but also causes atmospheric fluorine pollution and Destruction of the ecological environment

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