Nathaniel Arbiter was a great teacher, mentor and above all a great human being. I still remember how well he treated me even though I was only a student about to graduate. I try to emulate him in that regard. Arbiter is one of the few individuals in the broad field of extractive metallurgy who made outstanding accomplishments in industry and in academia. Not only did he make significant fundamental contributions to our knowledge of the engineering aspects of processing ores for mineral recovery, but he also, through the years, made a number of major contributions that resulted directly in the design of new plants for processing ores. His early work on the surface chemistry of flotation is still referred to by those of us doing research in the field. Some of his papers concerned with kinetics and energy consumption in grinding (size reduction) have been the basis for the research carried on by others in the field. His accomplishments in flotation machine design and analysis are becoming extremely valuable, since lower grade ores now necessitate the construction of much larger scale processing machines.
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