Fixation of free-fluorine in fluorine-containing silicon dioxide powder
Improper disposal of fluorine-containing silicon dioxide powder will lead to potential environmental pollution risk and waste of silicon resources.The fixation of free-fluorine in fluorine-containing silicon dioxide powder is studied,and the effect of water and calcium ion exchanger amount on the pH value and fixation effect of fluorine in fluorine-containing silicon dioxide powder solution is mainly investigated.The experimental results show that the pH of the fluorine-containing silicon dioxide powder solution can reach 6.16 when the temperature is 75℃,the stirring speed is 200 r/min,the reaction time is 30 min,and the amount of water and calcium ion exchanger are 200 mL and 12 g.The proportion of free-fluorine in the modified fluorine-containing silicon dioxide powder are 200 mL and significantly reduced,which has great application potential in the white carbon black and anti-rust pigment system.
fluorine-containing silicon dioxide powdersolid wastefluorine fixationcalcium ion exchanger
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