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Elutriation, attrition and segregation in a conical spouted bed with a fountain confiner

Particuology 2020年第4期18卷 35-44页

作者： Aitor Pablos Roberto Aguado Jorge Vicente Mikel Tellabide Javier Bilbao Martin Olazar Department of Chemical Engineering University of the Basque Country UPV/EHUP.O.Box 644E48080 BilbaoSpain Novattia Desarrollos Ltd.Scientific and Technologic Park of BizkaiaAstondo BideaBuilding 612E48160 DerioSpain

This study examined elutriation,attrition,and segregation in a conical spouted bed with a fountain confiner and incorporating an open sided draft *** silica sand with a wide particle size distribution was employed as a model material,operating in both the batch and continuous *** use of a fountain confiner is crucial when operating with fine particles,because otherwise the bed rapidly exhibits significant *** extent of attrition was quantified using a tracing technique based on differently-coloured sand fractions as well as monitoring size distributions by *** breakage was found to be the primary attrition mechanism,and the fountain confiner was determined to limit the elutriation of fine particles resulting from ***,only a small fraction of the finest particles were entrained from the *** incorporation of a confiner increased operational stability while reducing segregation,especially in the upper half of the bed where the majority of segregation typically ***,the bed was perfectly mixed apart from very minimal segregation close to the wall and at the bottom of the *** results provide a basis for the design and operation of larger scale equipment for the continuous drying of materials.

关键词： Spouted bed fine sand Elutriation Attrition Segregation Fountain confinement device

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Performance of engineered cementitious composite containing stone slurry powder waste

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Journal of Central South University 2021年第7期28卷 1990-2002页

作者： Maninder SINGH Babita SAINI H.D.CHALAK Department of Civil Engineering National Institute of Technology KurukshetraHaryana 136119India

Most of the materials used in engineered cementitious composite are fine in size to achieve ductile *** slurry powder(SSP)is an inert material obtained from stone industries as by-product which may cause hazardous impact on *** this research work,partial replacement of silica sand(SS)and fine sand(FS)by SSP with different contents(25%and 50%each)for making engineered cementitious composite has been *** performance was evaluated on the basis of strength,tensile strain,mid span deflection capacity,ultra-sonic pulse velocity and *** strength was found to be increased at 25%SSP in both replacements;whereas,strength decreased slightly at 50%*** strain,mid span deflection and quality of concrete were enhanced with increase in SSP *** SSP formed denser cementitious composite can help to save the natural resources and contribute in making green cementitious composite.

关键词： stone slurry powder fine sand scanning electron microscopy energy dispersive X-ray spectroscopy ultrasonic pulse velocity

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