Enhancement effects of ultrasound on the extraction efficiency of silicon from coal fly ash
XU Yi-wen1, JIANG Jian-guo1,2,3, YAN Feng1, LI Tian-ran1
1. School of Environment, Tsinghua University, Beijing 100084, China;
2. Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education, Tsinghua University, Beijing 100084, China;
3. Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, Beijing 100084, China
Silicon is the most abundant element in coal fly ash (CFA).In this study,silicon was extracted from CFA by hydrothermal-alkaline technique and the enhancement effects of ultrasonic techniques was also discussed.Raising temperature from 70 to 110,the extraction efficiency was increased by 41.7% after 90℃℃ min reaction,while at 110℃ the extraction efficiency was elevated by 20.0% after reaction time was extended from 10min to 90 min.Under the condition of 90 min reaction at 110,the extraction efficiency reached 49.5%.At high temperature (>100),ultrasound℃℃ pre-treatment could shorten the reaction time.When the extraction efficiency was higher than 45.0%,the hydrothermal reaction time was shortened from 60 min to 20 min by 10 min pretreatment of ultrasound.At lower temperatures (<100),℃ the silicon extraction efficiency was upregulated with simultaneous hydrothermal and ultrasonic treatment.When the ultrasonic treatment power was raised from 0 to 600W,the extraction efficiency was increased from 1.9% to 20.0% after 10 min reaction at 70.The surface area and pore volume of coal fly ash were markedly increased after silicon extraction,℃ which would be benefit for its potential utilization as cheap adsorbents.
徐一雯, 蒋建国, 颜枫, 李天然. 超声波对粉煤灰提硅的强化效果研究[J]. 中国环境科学, 2017, 37(7): 2656-2661.
XU Yi-wen, JIANG Jian-guo, YAN Feng, LI Tian-ran. Enhancement effects of ultrasound on the extraction efficiency of silicon from coal fly ash. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(7): 2656-2661.
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