130 ON THE METALLURGY OF NICKEL AND COBALT. 
It was evident, therefore, that a more thorough calcination 
far enough, as the presence of copper and nickel obscured the 
be reaction for ees oxide. It was found, shots Ck a y 
tal o 
5 
potassium nitrate, the characteristic brown colour was rapidly 
developed as long : as ferrous sulphate was present. 
As speiss was actually the substance under treatment, it was 
thought advisable to examine ey behaviour of the other oxides 
which are generally contained in it. A speiss was therefore 
made with ore and various tases: and after calcination was 
found to sane seb er cent. of — . nickel with the oxides 
of iron, copper, zine, cobalt, and a These oxides treated 
as before yeldel i in a flask stanchion 4 i the outlet a solution con- 
aining arsenic and zine which had been volatilized as chlorides, 
and the Sait on boiling with water a solution containing nickel 
and cobalt with a small quantity of iron. The insoluble “residue 
contained the ferric oxide, a small quantity of nickel oxide and 
ie as cuprous chloride, which could be removed by a solution 
It now remained to separate the small quantity of iron in the 
solution from the nickel and cobalt and these metals from each 
ferric chloride, and then adding to the boiling solution successive 
small portions of anhydrous ox xide of nickel, which dissolved, 
i chlori 
in excess. From a neutral solution containing ferrous chloride it 
was also found that manganese dioxide completely precipitated 
the iron without a trace of nickel or cobalt. 
On adding to the hot, iron free solution rather more oxide of 
nickel than was equivalent to the cobalt present, and passing 
chlorine into it, the whole of the cobalt was recipitated 
ig metalic nickel by igniting in & 
ease of a solution containing 
RE OMS Se cepa ets 3h 
gs 
