中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 14 No. 3 June 2004 |
（School of Resource Processing and Bioengineering, Central South University,
Changsha 410083, China）
Abstract:Through thermodynamic calculation and electrochemistry analysis, taking the galena as example, the basis for collector matching in origin potential flotation (OPF) was studied. The results of thermodynamic calculation show that the upper limit value of pH and flotation potential of diethyldithiocarbamate (DDTC) is higher than that of xanthogenate (KBX), which indicates that the collecting ability of DDTC for galena is better than that of KBX. The results of the in-
terface capacitance analysis show that lead diethyldithiocarbamate (PbD2) is more steady than lead xanthogenate (Pb (BX)2) on the galena surface under the oxidation condition; the resistance analysis shows that D2(DDTC oxidizes into its dimmer) and dixanthogen (BX)2will occur non-faradic desorption on the pyrite electrode surface when the potentials are above 0.13 V and 0.2 V respectively. A synthetical criterionΔEof collecting ability and selectivity was proposed. The
results predicted by this criterion are confirmed through flotation experiments of ore.
Key words: origin potential flotation; collector; galena
