Appeal No. 2005-0657
Application No. 10/136,984
diffused into the feedstock material to form cement clinkers”
(col. 4, ll. 16-22). Young further teaches that the “steel slag
begins to melt and combine with other raw materials somewhere
between the calcination zone and the burning zone in the rotary
kiln” (col. 5, ll. 32-35).
Oates teaches the addition of an extender such as blast
furnace slag at several locations in a kiln assembly (col. 1, ll.
31-36; col. 2, ll. 17-39). These locations include the upstream
end of the cooler adjacent the exit of the cement clinker from
the kiln and downstream of the zone of the kiln in which the
cement clinker is formed (col. 3, ll. 15-29). Oates teaches that
at elevated temperatures downstream of the formation of the
cement clinker, the particulate extenders melt to a partially
fused state which chemically reacts with the hot cement clinker
producing a “pyroprocessed” cement clinker composition (col. 3,
ll. 8-14). Oates further teaches that the extender is introduced
to the traveling bed of clinker at a point such that the extender
has an adequate residence time in the cooler, at a sufficiently
high temperature, for melting of the extender to a partially
fused material which chemically reacts with the hot clinker to
form the “pyroprocessed clinker” (col. 6, ll. 2-10). If desired,
the extender could be fed into the clinker mass downstream of the
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