Flotation oi Minerals, Part II. 325 



Flotation experiments with varying amounts of oil 



and acid. 



The following is a series of flotation experiments carried out 

 with a view to obtaining some data as to the effect of acid on 

 the subsequent flotation product produced when an oil is used, 

 the results of which are given in Table B. 



The tests were carried out in an enamelled pot, with a stir- 

 ring apparatus attached. The pot was heated from below by 

 a gas burner. TTie method of effecting the flotation was to 

 add the various materials taken in the tests to the 1400 c.c. 

 of water in the pot, and to gradually heat the mixture, at the 

 same time keeping the agitating propeller working con- 

 tinuously. On ceasing the agitation for a few minutes to let 

 the flotation product come to the surface, this latter was 

 skimmed oft' with a wire gauze strainer. After each skimming 

 another period of agitation was given, and in some cases, as 

 noted in the table, more acid was added, and the flotation 

 product re>-skimmed. The tailings called No. 1 have a gangue 

 consisting mainly of quartz and rhodonite, and those called 

 No. 2 have a more calcitic gangiie. In the tests numbered 

 1-10 inclusive, the tailings with the rhodonite gangue were 

 used, and in tests 11-14 inclusive the tailings with the calcite 

 gangue were used. Except where otherwise stated, 1400 c.c. 

 of water were used in each experiment. 



The results of the experiments show that (1) without the 

 addition of acid the flotation product produced by oil contains 

 much gangue material, and (2) that the addition of acid up to 

 a certain point decreases the amount of gangue in the flotation 

 product. 



This series of experiments was carried out in conjunction with 

 Mr. Donald Clark, late lecturer in Metallurgy at the University. 



