33G Janoyer on the Injluence of Sulphur on Iron, 



The fusion made with pyrites and burnt bones gave ^Y\^h 1'77 



.gram 



Snlpliiir not attacked by acids, - . - - 00200 gram. 

 Sulphate of baryta 0-23, sulphur, - - - 0S20 " 



Loss of sulphur, 



0520=1'4SG p. c. 



0-228 " 



Another gray iron fused Avith pyrites alone and again with 

 pyrites and burnt bones gave by analysis of two grammes the 

 following results : 



Fusion with pyrites alone. Sulphur, • - 0*0248 gram, 



pyrites and burnt bones. " - 0-0221 " 



O*0027=0'135 p. c. 



On comparing the results of the analyses, there is found in the 

 one case a loss of sulphur equal to 0*228 p. c. of the weight of the 

 iron, and in the other 0'135 p. c. in remelting with pyrites in the 

 presence of phosphorus, since the two fusions of each iron were 

 made in equal quantity of pyrites, and the loss of sulphur was 

 greatest where the calcined bones were added/^ I think there- 

 fore that this loss of sulphur was owing to the combination of a 

 portion of this last, with the phosphorus introduced after fusion, 

 these two bodies, in consequence of their great affinity, combm- 

 ing in all proportions to form some very volatile compounds. ^ 



To establish undeniably whether this probable combination 

 had taken place, I made some reverse synthetic experiments ; 

 that is to say, I remelted : 



1st 5 grammes of a gray iron with 0*20 of pyrites, 0'20 oi 

 calcined bones and O'lO of clay. 



2d. 5 grammes of the same iron with O'lO clay and 0'20 cal- 

 cined bones, to see what became of the phosphorus after the sec- 

 ond fusion in the presence of pyrites. 



The two experiments gave me two buttons perfectly melted 

 but entirely different in their external characters. The first, 

 without being very ductile, flattened slightly under the hammer 

 before breaking; its fracture was not smooth and shining as that 

 of the button resulting from the fusion with the burnt bones 

 without pyrites. 



Tliis last, on the contrary, was very friable, did not flatten 

 under the hammer, broke at the first blow ; it presented a per 

 fectly smootli surface, was silver-gray, quite brilliant, without any 

 fissure. Apart from its want of ductility it had many of the 

 exterior characters of nickel. 



phur in the first cast iron was not determined before fusion. It was o 

 portance to know this quantity which was in proportion to the otner 



xperiments of each iron. It was sufficient to know that it lost more oy 



, , i~ t — ^ ■" °^ ^*^^^ """ was nu 



put little importance to know this quantity 

 m the two experiments of each iron. It was 

 the addition of phosphorus. 



