硅氟酸溶液中方铅矿的阳极氧化动力学研究

ANODIC OXIDATION KINETICS OF GALENA IN SILICOFLUORIC ACID

用动电位扫描法测量不同条件下硅氟酸溶液中石墨电极上方铅矿的阳极氧化曲线 ,研究方铅矿的阳极氧化动力学。结果表明 ,方铅矿的阳极氧化曲线明显地分为 3段 ,氧化区di/dφ >0 ,传质区di/dφ=0 ,另一氧化过程 ,di/dφ >0。交换电流密度i0 随着温度的增加而增大 ,电化学传递系数 β的平均值为 0 16。搅拌速率、矿浆液固比对换电流密度i0

The anodic polarization curves of galena concentrate on graphite electrode in H 2SiF 6 solution are determined by using potentio dynamic scanning under various conditions The kinetics of anodic oxidation of galena concentrate in silicofluoric acid is investigated The results show that the anodic oxidation process of galena concentrate on the graphite electrode in H 2SiF 6 solution is divided into three stages significantly, the oxidation stage  d i/ d φ>0, the mass transfer stage d i/ d φ=0, another oxidation stage d i/ d φ>0  The exchange current density increases with the increase of temperature, and the average transfer coefficient is 0 16 The stirring rate and liquid/solid ratio play great role in the oxidation process of galena concentrate on the graphite electrode in H 2SiF 6 solution