Flotation oj Minerals, Part II. 329 



the subsequent flotation operations. The ferric chloride becomes 

 reduced to the ferrous state, and can be readily regenerated if 

 required. 



The results of some small tests on various (5res and products 

 are as follow : — 



Details of ferric chloride tests. 



No. 1. — Concentrates produced from an acid flotation on 

 Broken Hill tailings, ground to pass 80 mesh sieve. 



Fifty gms. taken and kept in suspension for half an hour, 

 with 200 c.c. water containing 10 gms. FeClg, and allowed to 

 stand 18 hours. Refloated with K2S0^ and a small amount of 

 oleic acid. 



Zn. p.c. Pb. p.c. 

 Zinc product, 45 gms., floated - - 51.0 6.2 



Lead product, 5 gms., not floated - 7.4 47.6 



No. 2. — Concentrates produced from an acid flotation on 

 Broken Hill slimes. 200 gms. of the mixed concentrate kept in 

 sus^Dension for 6 hours, with 300 c.c. of a 10 per cent. FeCl^ 

 solution. 



Refloated with sulphuric acid and a small amount of oleic acid. 



Zn. p.c. Pb. p.c. 

 Zinc product, 169 gms. - - - 51.8 5.3 



Lead product, 28 gms. - - - 16.7 38.1 



No. 3. — Concentrates produced from an acid flotation on 

 another sample of Broken Hill slimes. 100 gms. concentrates 

 taken and stood for 24 hours with 300 c.c. 10 per cent Fe Cl-g 

 solution. 



Refloated with sulphuric and small amount of oleic acid. 



p.c. Zn. p.c. Pb. oz. ag. 

 Zinc product, 67 gms. - - 48.5 8.2 25.25 

 Lead product. 31.5 gms. - 7.7 46.8 13.25 



No. 4. — Crude zinc lead ore from Tasmania. 200 gms. ore kept 

 in suspension for three-quarters hour and then let stand with a 

 3 per cent. FeCl^ solution. 



Floated the mixed sulphides with a small quantity of H2SO4. 



ozs. per 

 p.c. Zn. p.c. Pb. ton Ag. 

 Zinc product, 77 p.c. by weight 44.8 5.7 22.6 



Lead product, 33 p.c. by weight 10.8 41.3 9.4 



10 



