648 



CEMENTS, LIMES, AND PLASTERS. 



both granulated and ungranulated slag, as determined by Prost, is of 

 interest in this connection. The results of other tests, by Tetmajer, 

 are shown diagrammatically in Figs. 159 and 160. 



TABLE 244. 

 STRENGTH OF GRANULATED AND UNGRANULATED SL\G. (PROST.) 



Desulphurization due to granulation. When molten slag is poured 

 into water, a very large proportion of the sulphur contained in the 

 slag is carried off by the water. The extent to which the desulphuriz- 

 ing of the slag is secured by the simple method of granulating is shown 

 by the following result from actual practice at the slag brick works at 

 Kralovedvoor, Bohemia. Here the slag is granulated, just as in slag- 

 cement works, by running it into flowing cold water. Examination * 

 of the water used showed that it had increased in temperature from 

 14$ C. to about 56 C., and that it carried in 10,000 parts the follow- 

 ing parts of mineral matter in solution: 



Si0 2 0.426 



CaSO 4 0.749 



FeSO 4 0.108 



MgSO 4 0.448 



Na^O, . 178 



NaCl .038 



N a2 Si0 2 0.693 



CaS 0.271 



HsS . 047 



2.958 



* Engineering and Mining Journal, April 16, 1898. 



