66U 



CEMENTS, LIMES, AND PLASTERS. 



is ground in discontinuous West pebble mills. Mahon's experiments 

 preliminary to the establishment of this plant are discussed on an earlier 

 page. 



The slag-cement plant of the Illinois Steel Company, Chicago, 111., 

 obtains its slag from the blast-furnaces of that company. The speci- 



FIG. 163. Elevation and plan of Stewart slag-cement plant. (The Iron Age.) 



fications under which this slag is received, with analyses showing its 

 actual range in composition, will be found on a previous page. After 

 granulation and drying in a specially designed dryer the slag receives 

 its preliminary reduction in Griffin mills. Meanwhile the lime has been 

 slaked as described in detail on a previous page (p. 659), caustic soda 

 being added to regulate the set of the product. The ground slag and 



