DEVELOPMENTS IN MANUFACTURE OF COPPER WIRE 195 



Table of Solubilities (see Fig. 7). While a variation from the minimum 

 to maximum acid concentration does not materially afTect the pickling 



Reference: 



"Table or Solubilities" by Sioell 



Cheu. -i: Uet. Ens. Vol. 21 :ldl-2, I9I9« 



Qrams Copper Sulphate per 100 Grams Aater 

 (Saturation Point) 



Fig. 7 — Solubility curve of copper sulphate in a sulphuric acid solution (Temp. 25 ° C.) 



time, a variation in temperature has a decided efTect as may be seen 

 from Fig. 8. 



Electrolytic Plant 



Figure 9 shows a plant in which the copper is reclaimed from the 

 pickling bath at about the same rate as it is absorbed. This is ac- 

 complished by electrolytic deposition according to principles worked 

 out and practiced in the large refineries which produce electrolytic 

 copper. 



The electrolytic system operates best with a minimum content of 

 about 1 per cent copper and 5 per cent acid and a maximum of 3 per 

 cent copper and 10 per cent acid. The copper and acid contents are 



