THE ACTION OF ORGANIC SULPHUR IN COAL. McCALLUM. 215 



We have thus clearly obtained a series of samples with 

 gradually decreasing inorganic and increasing organic sul- 

 phurs. 



There is also another way in which the total sulphur may 

 bp distributed, viz. : as volatile and fixed sulphur ; meaning if 

 course, that sulphur which escapes during the coking process 

 and that which remains in the coke. 



The method used in obtaining this information is to first 

 determine the total sulphur in the coal and then the total sul- 

 phur in the coke produced from that particular coal. From this 

 it is easy to calculate the amount of sulphur volatilized. 



Table III gives the figures thus obtained. 



Table III. 



No. Volatile sulphur. Fixed sulphur. 



1 33.49% 66.51% 



2 42.64% 57.36% 



3 50.46% 49.54% 



4 49.47% 50.46% 



5 52.27% 47.73% 



There is not the same reg-ularity as shown in Table II, but 

 there seems to be an increase in the amount of volatile sulphur 

 in those samples having a high percentage of organic sulphur. 



ISTow if the only sulphur volatilized was the one atom of 

 sulphur in pyrites according to the above mentioned squation, 

 we can calculate what the percentage of volatile sulphur should 

 be; because the sulphur called inorganic is assumed to be 

 present as iron pyrites. So that if we take half the inorganic 

 sulphur it should correspond with the percentage of volatile 

 sulphur if the above supposition is true, and also if there is no 

 organic sulphur volatilized. 



