【摘 要】
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Basedl on the principles of simultaneous equilibrium and mass balance, a series of thermodynamic equilibrium equations of Co(Ⅱ)-C2O42-NH3-NH4+-H2O system at ambient temperature are deduced theoretical
【机 构】
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School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
【出 处】
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第五届国际湿法冶金学术会议(5th International Conference on Hydrometallurg
论文部分内容阅读
Basedl on the principles of simultaneous equilibrium and mass balance, a series of thermodynamic equilibrium equations of Co(Ⅱ)-C2O42-NH3-NH4+-H2O system at ambient temperature are deduced theoretically and the logarithm concentration versus pH (logc-pH) diagrams at different solution compositions are drawn.The results show that when pH is above8.0, cobalt ions coordinate with ammonia and the precipitation proceeds slowly accompanying with the release of cobalt ions from the multicoordinated Co(NH3)n2+(n=1, 2,..., 6), the morphology of cobalt powder precursor is fibrous; when pH is below 8.0, cobalt ions directly react with C2O42-, the morphology of cobalt powder precursor is cubic-shape.According to thermodynamics analysis and calculation, some experiments were done to validate the relation between the total concentration of.cobalt ions and pH in this study.
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