Characterization of Carbon Concentrates from Coal-Combustion Fly Ash

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• 作者：John P. Baltrus ; Arthur W. Wells ; Daniel J. Fauth ; J. Rodney Diehl ; and Curt M. White
• 刊名：Energy & Fuels
• 出版年：2001
• 出版时间：March 2001
• 年：2001
• 卷：15
• 期：2
• 页码：455 - 462
• 全文大小：167K
• 年卷期：v.15,no.2(March 2001)
• ISSN：1520-5029

文摘

A study of carbon concentrates separated by a number of different commercial and laboratorymethods from various coal-combustion fly ashes was undertaken to determine what commonand unique chemical and physical properties can be expected in such concentrates. The propertieswere determined using a variety of physical and spectroscopic characterization methods and thenwere compared among the carbon concentrates and in two cases with the properties of theunprocessed fly ashes. The class F fly ashes originated from a total of seven different utilitiesburning bituminous coals and underwent one of six different processing methods to produce thecarbon concentrates, which contained from 24% to 76% carbon. Three different configurations oftriboelectrostatic separators were used to produce the carbon concentrates in addition to twodifferent flotation methods plus a proprietary carbon recovery process. The results showed thatunburned carbon concentrates from fly ash have properties similar to most carbon blacks andwould be poor replacements for activated carbon in adsorption processes unless they are activatedin a separate step. The untreated carbon may have applications as a substitute for carbon blackprovided it could be obtained in sufficient purity. The results have implications for those whowish to use carbon concentrates from coal-combustion fly ashes in secondary markets, especiallyas sorbents and fillers.