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The recovery of kish graphite from secondary sources

Frost, Robert (2015)
M.Res. thesis, University of Birmingham.

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Abstract

With the worldwide demand of graphite increasing, so the availability, cost and quality is under renewed scrutiny - with the vast majority of graphite being mined, and with these mines located in only a few significant countries, considerations of availability and sustainability have led to an increasing dependence on synthetic graphite to meet industrial needs.
One potential source is ‘kish’ graphite recovered from the steel making process: Present within the dust produced as waste in steel plants, graphite flakes have been found in varying quantities, sizes and purity. Seven samples taken from a steel plant were analysed and tested. This testing broadly consisted of separating the kish graphite from the excess waste dust, and refining this graphite.
Froth flotation was found to be an extremely effective way of achieving this, with purities of >90% being achieved from a single flotation for the larger flake sizes (>500µm). For the smaller flake sizes (<500µm), multiple froth floats were found to be needed in order to achieve the desired purity, but further complications required acid cleaning in order to achieve a >90% graphite sample.
A saleable product was produced and a technical-economic assessment was made for a 10,000 tonne per year process plant.

Type of Work:M.Res. thesis.
Supervisor(s):Rowson, Neil
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemical Engineering
Subjects:TP Chemical technology
Institution:University of Birmingham
ID Code:5704
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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