48 Transactions of the Royal Canadian Institute 



were thus determined, each through a considerable range of temperature, 

 and the results embodied in curves and tables. This method of deter- 

 mining in an accurate way the fluidity of slags and so of helping to solve 

 the problem of chemical control in a furnace, seems to be capable of 

 wide application, and worthy of serious consideration in a case such as 

 the one being discussed. 



Self-fluxing Ore 



On comparing the analyses of the titania slags as determined above 

 with the recorded analyses of some Canadian titaniferous ore deposits 

 it was noticed that the slag-forming materials of the latter approximated 

 fairly closely to the former. A further study of the matter revealed the 

 fact that in a number of cases at least, Nature had provided, ready 

 mixed with the ore as ferro-magnesian silicates, the fluxing material 

 that had been added in the form of sand in the smelting experiments. 

 This high proportion of silica has always caused this class of ore to be 

 considered as of little value, where it had to be fluxed with the addition 

 of lime in regular blast-furnace practice. In this method of smelting, 

 on the other hand, the silica in the ore is an asset. 



Analyses Indicating Self-fluxing Ore 



I II III IV V VI VII 



Fe 49.8% 44.5% 48.5% 38.8% 40.5% 59.6% 



I — Chaflfey Mine — F. J. Pope — as above. 



II — Pine Lake Deposit — F. J. Pope. 



III — Millbridge, Hastings County — F. J. Pope. 



IV — Seven Islands, Gulf of St. Lawrence — E. Dulieux, Mining Op. 



Quebec, 1911, p. 124. 



V — An Ontario deposit. 



VI — A Newfoundland deposit. 

 VII — ^Slag G 3 (for comparison). 



The above table shows in column VII, a typical analysis of the titania 

 slag (G 3) and in the other columns, the slag-making constituents of 



