摘要
根据Ni(Ⅱ)-Mn(Ⅱ)-NH3-CO32--H2O体系的热力学,绘制出溶解度、过饱和度及pH的变化规律图,确定了选择性沉淀分离镍、锰的工艺条件。热力学分析结果表明,在pH≈10条件下,采用反向(金属剂加入到沉淀剂中)加料方式,有利于锰的选择性沉淀。沉淀分离试验结果证实了热力学预测结果,所得碳酸锰沉淀粉末的分散性和洗涤性能良好,镍损失率仅1.0%,锰沉淀率高达99.7%。
Thermodynamic analysis on the Ni（ Ⅱ ）-Mn（ Ⅱ ）-NH3-CO3^2--H2O system was carried out to obtain curves concerning solubility, supersaturation and pH value, which were used to determine the appropriate process conditions for separation of nickel and manganese by selective precipitation method. The results showed that manganese was selectively precipitated at the conditions of pH≈10 and metallic-to-precipitant feeding way. The thermodynamic prediction results were verified by the experimental results that the precipitated manganese carbonate powder exhibit high dispersion and washing performance with precipitation percentage of nickel as low as 1.0 % and that of manganese as high as 99.7%0.
出处
《湿法冶金》
CAS
北大核心
2011年第4期298-303,共6页
Hydrometallurgy of China
关键词
选择性沉淀
热力学分析
镍
锰
分离
溶解度
过饱和度
selective precipitation
thermodynamic analysis
separation ~ nickel
manganese
solubilitysupersaturation
