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| 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 |
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Abstract 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.
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Received: 07 November 2016
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