强碱溶液中电沉积金属锌粉技术

碱浸-电解法制备金属锌粉技术具有流程简单、环境友好、适应性强等特点.本文通过能斯特方程计算了强碱性溶液中锌沉积的理论分解电动势,并考察碱浓度、锌浓度、极距、电流密度、搅拌等参数对金属锌粉质量和电流密度的影响,得到最佳的电解条件为：碱浓度4 mol/L,锌浓度30 g/L,极距3 cm,电流密度1000 A/m2,不搅拌.在最佳条件下电解得到的金属锌粉,全锌含量为97.38%,金属锌含量为96.79%,基本达到《锌粉的质量技术要求（ GB/T6890-2000）》的一级标准.

The Technology of Electrodeposition of MetallicZinc Powder in Alkali Solution

The technology of production of metallic zinc powder from lean ores bearing zinc and the wastes using alkaline leaching and electrowinning process has the advantages of simple flowshee,environmental friendly and fine adaptability. In this paper,the electrode potential of zinc electrodeposition in alkali solution had been calculated and the effect of zinc and alkali concentration,current density,polar distance and stirring on the quality of metallic zinc powder and current efficiency had been studied. Optimum conditions of zinc electrodeposition were found to be 4 mol/L NaOH concentration,30 g/L zinc concentration,1000 A/m2 current densi-ty and 3cm polar distance. The total and metallic Zn content of metallic zinc powder were 97. 38% and 96. 79% respectively,which can meet the industry standard.