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to 
“I 
On the Metallurgy of Nickel and Cobalt. 
By W. A. Drxon, F.C.S., M.I.C. 
[Read before the Royal Society of N.S.W., 3 July, 1878.] 
Snorriy after the discovery of the large deposits of nickel and 
cobalt ores in New Caledonia I turned my attention to the 
metallurgy of er rp te and began this research with a view 
to improvements in their extraction, keeping in view the 
that here the reagent saute employed in their bral are 
exceedingly expen 
The sources of arb: previously to the discovery of these 
ress argv chiefly of speiss, the residue from the manu- 
factur smalt, which contains from six eight er - of 
remove part of the iron and obtain an enriched matt. This matt is 
ground, thoroughly roasted, to expel : arsenic and ain hy and con- 
vert the metals mto oxides 
milk of lim arsenic being removed at the same sr - 
phureted hypdvenen 3 is then passed into the fililate to precipitate 
copper, and from the clear solution cobalt is precipitated by 
ine te of calcium, and afterwards the nickel by milk of 
magnesium sulphate and ¢ prille and pie chloride at various 
temperatures was therefore tried, but minute quantities only of 
per were Sinsatred, though in every case my tinct traces were 
ed. 
