The electrode process of pyrite in diethyldithiocarbamate (DDTC) solution pH 11.4 was investigated by using cyclic voltammetry, potentiost atic and chronopotentiometry. Tetraethylthioram disulphide(TETD) was electrode...The electrode process of pyrite in diethyldithiocarbamate (DDTC) solution pH 11.4 was investigated by using cyclic voltammetry, potentiost atic and chronopotentiometry. Tetraethylthioram disulphide(TETD) was electrodepo sited on pyrite electrode surface as the electrode potential is higher than 0.2 V. The relationship of the current density caused by diffusion and reaction time can be ascertained as i =1/(9.08×10 -5 +4.77×10 -3 t 0.5 ) , and the diffusion coefficient of DDTC on pyrite surface is about 3.72×10 - 6 cm 2/s. At pH 11.4, the thickness of TETD adsorbed on pyr ite surface is about 1.63 molecule layer. The electrochemical dynamics equation of the reduction of TETD on pyrite surface is given as η =0.116-0.064log[1- ( t/τ ) 0.5 ]. The kinetic parameters were determined as follows: the ex change current density ( i 0) is 3.08 μA/cm 2; the transmission coeffi cient( α ) is 0.462.展开更多
The electrode process of galena in diethyldithiocarbamate (DDTC) solution at pH 11.4 has been investigated using cyclic voltammetry, potentiostatic and chronopotentiometry. Electrodeposit of PbD 2 on galena electrode ...The electrode process of galena in diethyldithiocarbamate (DDTC) solution at pH 11.4 has been investigated using cyclic voltammetry, potentiostatic and chronopotentiometry. Electrodeposit of PbD 2 on galena electrode surface can occur while the electrode potential is higher than -0.05?V. The relationship between the current density caused by diffusion and reaction time has been ascertained, and the diffusion coefficient of DDTC on galena surface in DDTC solution is about 1.12×10 -6 cm 2/s. A passive PbD 2 film covers the surface of galena electrode.展开更多
文摘The electrode process of pyrite in diethyldithiocarbamate (DDTC) solution pH 11.4 was investigated by using cyclic voltammetry, potentiost atic and chronopotentiometry. Tetraethylthioram disulphide(TETD) was electrodepo sited on pyrite electrode surface as the electrode potential is higher than 0.2 V. The relationship of the current density caused by diffusion and reaction time can be ascertained as i =1/(9.08×10 -5 +4.77×10 -3 t 0.5 ) , and the diffusion coefficient of DDTC on pyrite surface is about 3.72×10 - 6 cm 2/s. At pH 11.4, the thickness of TETD adsorbed on pyr ite surface is about 1.63 molecule layer. The electrochemical dynamics equation of the reduction of TETD on pyrite surface is given as η =0.116-0.064log[1- ( t/τ ) 0.5 ]. The kinetic parameters were determined as follows: the ex change current density ( i 0) is 3.08 μA/cm 2; the transmission coeffi cient( α ) is 0.462.
文摘The electrode process of galena in diethyldithiocarbamate (DDTC) solution at pH 11.4 has been investigated using cyclic voltammetry, potentiostatic and chronopotentiometry. Electrodeposit of PbD 2 on galena electrode surface can occur while the electrode potential is higher than -0.05?V. The relationship between the current density caused by diffusion and reaction time has been ascertained, and the diffusion coefficient of DDTC on galena surface in DDTC solution is about 1.12×10 -6 cm 2/s. A passive PbD 2 film covers the surface of galena electrode.
