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US 5,494,515 AGranted
Method and apparatus for using blast-furnace slag in cement clinker production
AssigneeTexas Industries, Inc.
InventorRom D. Young
Life of this patent
Estimating the term…
Abstract
A process and apparatus by which blast-furnace slag can be added to the feedstock materials fed into the feed-end of a rotary cement kiln to form cement clinkers. The blast-furnace slag is crushed and screened to provide blast-furnace slag particles having particles with a predominant size of up to a maximum diameter of substantially 2" or less.
Claims6
A method of cement clinker manufacture using an elongated rotary cement kiln having a feed-end and a heat-end, the heat-end being tilted downwardly with respect to the feed-end, the method comprising the steps of:
- directing heat from a heat source into said heat-end of the kiln;
- introducing a stream of feedstock material containing limestone into said feed-end of the kiln such that the stream of feedstock material moves toward said heat at the heat-end of the kiln;
- crushing and screening air-cooled blast-furnace slag to obtain particles with a predominant size of up to a maximum diameter of substantially 2";
- and
- adding an amount of said crushed and screened air-cooled blast-furnace slag to said stream of feedstock material at said feed-end end of the kiln, such that as the stream of feedstock material and blast-furnace slag moves toward said heat-end, end, the blast-furnace slag is melted by said heat and diffused into the feedstock material to form cement clinkers.
2 more elements
Dependencies are inferred from the claim text.