Janoyer on the Influence of Sulphur on Iron. 337 



So great a difference in the exterior cliaracters of the two but- 

 tons was sufficient to make me believe m a loss of phosphorus 

 through the presence of sulpliur. 



As a final test, I remelted again: 



5 grammes of a gray cast iron with 020 of pyrites, 0*20 of 

 calcined bones, and 0*20 of clay. 



5 grammes of the same iron with 0'20 of calcined bones and 

 0*20 of clay. 



Two grammes of each button from the fusion were analyzed 

 * * * * ^ 



0-024 



■Result of experiments with calcined bones gave phosphoric acid, 



" " " calcined bones and pyrites, phosphoric acid, 0027 



It is seen from the two results of the analyses, that the phos- 

 phorus did not disappear in the fusion of the iron in the presence 

 of phosphate of lime and pjriteSj whilst the analyses in the in- 

 verse experiments showed a loss of sulphur which evidently 

 could not have proceeded from a volatile combination of sulphur 

 2<nd of phosphorus as was first supposed. 



M. Gruner, Engineer in chief of the mines, my excellent pro- 

 fessor to wdiom I am iiidebted for numerous useful councils in 

 this memoir, advised me to 

 examine the carbon, to assure myself if it did not play an import- 

 ant part in the disappearance of the sulphur. 



He had in fact remarked, in an assay by the dry way of ores 

 highly phosphatic, that some isolated granules of the fused metal 



take 



th 



to 



their feeble density, and which were, doubtless, phosphuret of 

 iron without carbon ; for had they been other than this, they 

 ■^vould have been simply a phosphatic cast iron which would 

 have possessed the magnetic properties of the fused button. 



Indeed, it appears from the experiments which I have made, 

 tliat phosphoruSj tending to combine with the iron of the cast- 

 ing to form a phosphuret, replaces a certain portion of the car- 

 bon, which in its turn meets with sulphur from the pyrites and 

 forms a sulphid of carbon independent of that which forms 

 from the presence of pyrites alone without the concurrence of 

 phosph 



In this manner we may explain the loss of sulphur, which 

 ^^? been proved to occur without a loss of phosphorus. 



These analyses of carbon presenting great difficulties, particu- 

 larly in the workshop of a metallurgist, I adopted the method 

 of M. Regnault for the combustion of the cast iron, as it seemed 

 the only convenient method of separating these small quantities 

 of carbon. 



S£CO^^D SERIES, VOL. XXIV, NO. 72. — NOV., 1857. 



43 



orus. 



