Processing of ceramic materials
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United States of America Patent
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Jan 29, 2002
Grant Date -
N/A
app pub date -
Dec 29, 1997
filing date -
Jan 11, 1997
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Abstract
A process for treating a nitride-containing ceramic material which includes the following steps: (1) comminuting the material to produce a particulate ceramic material having a particle size distribution such that at least 40% by weight of the particles have an equivalent spherical diameter (esd) smaller than 2 .mu.m; and (2) a ferrosilicon separation step comprising one or both of the following steps: a) subjecting the particulate ceramic material produced in step 1 to differential sedimentation in a liquid medium to produce substantial separation of a light fraction from a heavy fraction, ferrosilicon required to be separated being included in the heavy fraction and refined particulate ceramic material being included in the light fraction; b) subjecting a suspension of the particulate ceramic material to magnetic separation to produce substantial separation of magnetic particulate material from non-magnetic particulate material, refined particulate ceramic material being included in the non-magnetic material.
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