82 NEW MINERAL DISCOVERIES IN NOVA SCOTIA.—GILPIN. 
In the destructive distillation of coal the sulphur is divided 
between the gas and the coke. From the former it can be 
removed by increasing the purification plant, but its removal 
from the latter is still practically an unsolved problem. It may 
be said in general terms that about half the sulphur is usually 
driven from the coal in the coking process. 
As the sulphur in the coke is largely transmitted to the 
pig iron made in a blast furnace, its presence in any large 
amount is a serious matter. As yet, attempts to lessen the 
amount of this impurity have been contined to taking advantage 
of its higher specitie gravity, as compared with that of coal, to 
separate it more or less thoroughly by washing processes. In 
this connection some figures on the practical use of Cape Breton 
coke in the Ferrona furnace may be of interest. The percentage 
of sulphur in the coal may occasionally reach 3 per cent; again 
it runs down to a few tenths of 1 per cent. This difference 
exists between different layers of the same bed, and different 
localities in the same mine. The average percentage is low. 
The coke made from unwashed Dominion coal contains, as 
impurities, 1.08 per cent of sulphur, and 8.2 per cent of ash. 
Coals running higher in sulphur are washed before being coked. 
In the manufacture of Bessemer pig the amount of phosphorus 
in the coke is an important item. It is exceptionally low in 
this coke, averaging .0028 per cent. The calorific value of the 
dry fuel, containing 5.84 per cent of ash is, according to the 
Dulong-Mahler formula, 12.437, B. T. U. The coke is of good 
quality, hard and compact. 
The pig iron has the following composition:— 
Basic pig. Foundry pig. 
SHeOMe weak ts 6a eeieeeees Oe 50 Dae 
Mia aneSe cus ean cieic. c0  o eyete nose S7 65 
PRospnoOcus Mew css ae eee oe 1.23 1.20 
SLT) 901,39) Seah) ok ae ene ig 017 02 
GeCarbom tec. sss bs saree Cee 3.64 
Cii@arbonmtawer <0 «eee eee ah ease 23 
TrGH Cea e Ne ye can iene 97.00 92.00 
