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Full text of "Metallurgy Of Cast Iron"

	No. i.	No. 2.	No. 3.
Silica ...........................	3.03	1.98	54
Iron Oxide ......        ......	.92	.60	.12
Alumina                ....                                       __	1.25	.90	.36
Phosphorus		.0-17	
Carbonate of L,ime ...............	92. 10	82.85	98.78
Carbonate of Magfuesia .....       ......	1.26	13.04	
I/ime Oxide .............................. , .....	5Ig57	46.41	55 -32
Magnesium Oxide        ......             ......	1.63	17.23	
The physical character of No. i is very hard and of a dark color, and is a grade of limestone largely used for blast furnaces. It is obtained near New Castle, .Pa. No. 2 is of a much softer quality than No. i and also more white and clear in its color. It is known as Kelly Island limestone and is mined at Marblehead and Lakeside, O. No. 3 is softer and purer in color than either Nos. i or 2 and has something of a checked marble cast. It is obtained from the Benson Mines, New York, and instead of being called limestone as are the first two shown, it is defined as calcite by the shippers. It will be noticed that Nos. 2 and 3 have no sulphur. For many classes of work this is preferable to No. i As sulphur in limestone is similar in its effect to sulphur in fuel, it largely passes into the iron and raises its sulphur contents. For cupola work preference, as far as labor is concerned, would be given to Nos. 2 and 3 owing to these being more friable than No. i, but the furnace limestone No, i is will also show that a flux which, might work well in a furnace can often be well utilized in cupola practice:gases, heated stock, and liquid metal should enable can counteract the absorbing power ofee reactiony they are often composed of about equal parts of silica and alumina. Bricks should contain silica or alumina in proportion to the amount of heat or friction they are                                                 if j