I 



I 



iJanoyer on the Tnjluence of SulpJmr on Iron. 33 



with 014 pyrites, 014 calcined bones, and 0-09 of a refractory 

 white clay. 



^ In these two trials I introduced into the cast iron a fixed quan- 

 tity of sulphur : but in the last I added also a certain quantity 

 of phosphorus ; for the predisposing afiinity of the silica for the 

 bases at a high temperature would necessarily lead to the decom- 

 position of the phosphate of Imie of the calcined bones, and the 

 phosphoric acid reduced b}^ the carbon of the cast iron would 

 combine with the iron to form a phosphuret of iron. The ex- 

 periment succeeded perfectly* The fasion was complete and the 

 temperature was pushed even to the softening of the crucible. 

 The two buttons when broken were entirely white, as I have 



fi 



ijiuence de soxtfi 



The button which contained only the sulphur, bent quite well 

 under the hammer although the cast iron was of a very bad 

 quality ; it was only a mass of filamentary crystallizations of 

 protosulphid of iron. This cast iron had a dull aspect, and it 

 j Was very diflicult to pulverize in a mortar; it flattened so as to 



afford small plates. Certain portions especially were very duc- 

 tile. These portions doubtless contained some of the iron free : 



m 



M, Fournet, '' Siir 



Metall 



can be partially decomposed in presence of carbon at a high tem- 

 perature. This learned geologist in heating to 150^ (pyrometer) 

 in a brasqued crucible some pyrites, obtained a button of proto- 

 sulphid of iron wbich was scarcely at all magnetic. This same 

 button, heated strongly a second time under the same circum- 

 stances, became after this second fusion strongly magi:ietic, from 

 which fact it is concluded that a loss of sulphur had resulted, 

 and a production of free iron in the proto-sulphid. 



The button which contained some sulphur and phosphorus 

 ^as, unlike the first, very brittle ; it is easily pulverized and does 

 ^ot yield in the least under the hammer. 



^ From this frequently exemplified fact in practice, the conclu- 

 sion has been deduced: that phosphorus injures to a great de- 

 gree the tenacity of cast iron. In the second button there could 

 De distinguished by means of a lens parts of sulphurous crystal- 

 lizations and some crystalline particles showing very brilliant 

 facets. 



The buttons from the two assays were pulverized and analyzed. 



1 fiH loi u^wi n _ 



The followinoj are the result of two analyses. 



The experiment made with pyrites alone gave with 1-77 gram. 



Sulphur not attacked by acids, - - - 00160 gram. 

 Sulphate of barjta 0'S3, sulphur, • - - '0455 « 



0-0605=l-714 p. c 



