方鉛鉱浮選におけるクロム酸イオンの抑制作用に関する電気化学的研究
1970 年 86 巻 990 号 p. 587-592
詳細
1970 年 86 巻 990 号 p. 587-592
By the electrochemical method, the effect of chromate ions on the galena flotation systems were investigated under several conditions. The following results were obtained:
(1) In the solutions including precipitants of lead ions, the curves of poralization on galena electrodes were similar to that of the metals at a passivation state.
(2) When the electrodes were set at 0.5 and 0.8 volts versus satulated calomel electrode in 1/30M K2CrO4 aqueous solutions, lead chromate and lead dioxide films were identified by means of electron diffraction methods respectively.
(3) When the galena electrode surfaces were completely covered with lead chromate films, its thickness were accumulated to the order of 55-110Å.
(4) The anodic films were suggested to be ionic conductive. The electric conductivity of the lead chromate films changed with current densities.
(5) By the contact angle measurements of bubbles, it was suggested that the formation of lead chromate films and the oxidation of galena were required to depress the dotabilities of galena in mild alkaline solutions.
