[walker] 



SEPARATION OF NICKEL AND COBALT 



95 



in the fact that with the former oxide the precipitate obtained is much 

 heavier so that more speed can be attained in filtering and washing. 



II. Neumann's separation. 



Neumann has suggested^ that the nickel in steel and matte may be 

 satisfactorily determined by precipitating the iron as ferric hydroxide 

 by means of ammonia, boiling, diluting to a definite volume and 

 filtering oflf from this solution a definite proportion from which to 

 plate out the nickel content. Following his conditions I have made 

 a number of experiments which prove that the results are very variable 

 and always too low to have any scientific value. I have obtained 

 similar results by using other reagents to precipitate the iron ; but in all 

 cases it was found that the nickel results were low. 



Details. 

 III. 



Precipitation of Iron from Sulphates. 



Details. 

 IV 

 Precipitation of Iron from Chlorides. 



>rj^ 



1 Chemiker Zeitung XXV, p. 731. 





V 



