338 Janoyer on the Injlitence of Sulphur on Iron. 



In open crucibles by a forge fire were remelted : 



1st. 10 grammes of very fine iron wire (No. 8 of commerce) 

 cut into three small pieces, with 0*20 grammes of pyrites. 



2d. 10 grammes of the same wire with 0'20 gr. pyrites, and 

 0'20 gram, of calcined bones. 



The amount of sulphur in tlie two fused buttons were esti- 

 mated in order to ascertain whether there had been a loss of sul- 

 phur as in the fusion of the cast iron^ made under the same cir- 

 cumstances. 



For if in these two trials the analyses gave the same amount of 

 sulphur, it would be demonstrated that carbon was the sole agent 

 which caused a loss of sulphur in the case of the fusion of the 

 cast iron, and that the phosphorus by replacement of the carbon 

 had assisted in this loss of sulphur. In melting the iron wire 

 in the presence of pyrites and in an open crucible, it might be 

 supposed that a loss of sulphur would occur by oxydation from 

 the air, but such was not to be feared in this case, as a great 

 quantity of iron covered the pyrites completely, preventing all 

 contact with the air. 



The two assays succeeded perfectly: the two buttons were 

 well fused. That made with the phosphate of lime was very 

 hard, breaking readily, from which it is seen that phosphorus 

 tends to make iron very ** cold-short." 1*90 grammes of each 

 button of fusion were treated with boiling nitric and a little hy- 

 drochloric acid so as to dissolve everything completely, except 

 some little granules of sulphur, which were readily collected. 



The following are the results of the two assays ; 



1. Trial with pyrites and calcined bones ; 



Sulphur pot attacked by acids, - - ^ O^DloO 



Sulphate of baryta, 0'03 : Sulphur, ^ - - 0*004 1 



0-0191 



2 



Sulphur not attacked by acids, ... 0-0001 

 SulpliatiB of baijta, 0-065 : Sulphur, - - 00089 



0190 0-0191 



0-0190 



•0001 



From this it is seen tliat there is no material difference in the 

 quantity of sulphur, since on calculating the sulphur in the sul- 

 phate of baryta to five decimals, there is only a difference of a 



isrratn 



phorus removes no portion of the sulphur when iron is remelted 

 in presence of pyrites and phosphorus. . , 



On the contrary, when cast iron is melted with pyrites ana 

 phosphate of lime, there is always found a loss of sulphur. 



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JS 





