Research on Fluoride Conversion Law in the Collaborative Utilization of Secondary Aluminum Ash in Ceramic Kiln
The ceramic kiln uses heavy metal sludge as raw material,synergistically utilizes aluminum ash,and prepares high-performance ceramic particles through high-temperature sintering,which is an important way to achieve harmless and resource utilization of secondary aluminum ash.The fluorine in secondary aluminum ash is toxic,so it is necessary to conduct in-depth research on the transformation law of fluoride.The experiment uses ion chromatography,X-Ray Diffraction(XRD),and X-Ray Fluorescence(XRF)to study the conversion law of fluorine in the synergistic utilization of aluminum ash by heavy metal sludge from ceramic kiln to prepare high-performance ceramic particles.Research has found that increasing the roasting time,the ratio of heavy metal containing sludge to secondary aluminum ash,and the roasting temperature can transfer more fluorine from secondary aluminum ash to the exhaust gas;extending the leaching time,increasing the leaching temperature,and increasing the liquid-solid ratio can help reduce the fluorine content of ceramic particles.The optimal sintering conditions are a material ratio of 20%,sintering temperature of 1 100℃,and sintering time of 20 min,and the optimal leaching conditions are a liquid-solid ratio of 5∶1 for sintered ceramic pellets,a leaching temperature of 35℃,and a leaching time of 60 min.After sintering and leaching under optimal conditions,43.94%of fluorine in the secondary aluminum ash is converted into gas,23.69%of fluorine is transferred to the leaching solution,and 32.37%of fluorine is residual in the leaching residue.Therefore,appropriate control of roasting parameters and leaching conditions can affect the migration and transformation behavior of fluoride at high temperatures,which is of great significance for improving the efficiency of secondary aluminum ash treatment and reducing the impact of fluoride on the environment.
secondary aluminum ashhigh temperature sinteringceramic particlesfluoridesmigration conversion
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