Magnetically Stabilized Fluidized Beds for Solids Separation by Density
Magnetically Stabilized Fluidized Beds for Solids Separation by Density
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DOI：
10.1080/01496398708056156
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发表时间：
1987
影响因子：
2.8
通讯作者：
R. E. Rosensweig;W. K. Lee;J. Siegell
中科院分区：
文献类型：
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作者：
R. E. Rosensweig;W. K. Lee;J. Siegell
摘要：介绍了利用密度差法对固体进行干燥分离的系统。它们由磁稳定流化床（MSB）作为宿主介质组成，其中重固体下沉，轻固体漂浮。磁稳定产生无气泡的流化介质，从而通过防止待分离的进料固体的再混合来提高分离效率。通过调节气体流化速度，可使MSB的表观堆积密度保持在待分离混合物中固体的表观堆积密度之间。使用间歇式和连续式固体流化床进行了若干试验，以分离由煤和石灰石组成的固体混合物。在使用该二元进料的连续操作实验中，获得了90%以上纯度的饲料固体回收率。讨论了使床层屈服应力和粘度对分离效率影响最小的最佳操作条件。配置为…
Abstract Systems for the dry separation of solids by density difference are described. They consist of a magnetically stabilized fluidized bed (MSB) as a host medium in which heavy solids sink and light solids float. The magnetic stabilization produces a fluidized medium with the absence of gas bubbling and thus enhances the separations efficiency by preventing remixing of the feed solids to be separated. The MSB can be maintained with an apparent bulk density between that of solids in a mixture to be separated by adjusting the gas fluidization velocity. Several experiments have been conducted using both batch and continuous MSBs to separate a solids mixture consisting of coal and limestone. In the continuously operated experiments using this binary feed, recoveries of 90% of the feed solids at over 90% purity were obtained. Preferred operating conditions for the MSB are discussed which result in minimizing the effects of bed yield stress and viscosity on the separations efficiency. Configurations for the...