摘要
According to the principle of mass balances and thermodynamic data, lg [Me]—pH diagrams (Me=Ca, Mo) for Ca-Mo-CO3-H2O system at 25 ℃ were presented with total dissolved carbon-containing ions concentrations of 0.01 mol/L and 1 mol/L, and lg [Me]—pH diagram for Ca-Mo-H2O system at 25 ℃ was also depicted. The effects of system pH value and total dissolved carbon-containing ions concentrations on the concentrations of the species in Ca-Mo-CO3-H2O system were studied. The results show that the stability region of CaMoO4 reduces significantly in the presence of sodium carbonate. In order to achieve effective leaching of molybdenum from CaMoO4, a certain concentration of sodium carbonate is necessary. High total dissolved carbon-containing ions concentrations and high pH values facilitate to the leaching of CaMoO4 and dissolved sodium carbonate is an efficient leaching agent for decomposing CaMoO4.
According to the principle of mass balances and thermodynamic data, 1g [Me]-pH diagrams （Me=Ca, Mo） for Ca-Mo-CO3-H2O system at 25 ℃ were presented with total dissolved carbon-containing ions concentrations of 0.01 mol/L and 1 mol/L, and 1g [Me]-pH diagram for Ca-Mo-H2O system at 25 ℃ was also depicted. The effects of system pH value and total dissolved carbon-containing ions concentrations on the concentrations of the species in Ca-Mo-CO3-H2O system were studied. The results show that the stability region of CaMoO4 reduces significantly in the presence of sodium carbonate. In order to achieve effective leaching of molybdenum from CaMoO4, a certain concentration of sodium carbonate is necessary. High total dissolved carbon-containing ions concentrations and high pH values facilitate to the leaching of CaMoO4 and dissolved sodium carbonate is an efficient leaching agent for decomposing CaMoO4.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2007年第3期622-625,共4页
Transactions of Nonferrous Metals Society of China
基金
Project(50434010) supported by the National Natural Science Foundation of China
关键词
钼酸钙
碳酸钠
热动力
浓度学
图表
calcium molybdenum（CaMoO4）
sodium carbonate
decomposition
thermodynamic analysis
concentration logarithm diagram
作者简介
Corresponding author： ZHAO Zhong-wei; Tel： ＋86-731-8830476; E-mail： zhaozw@mail.csu.edu.cn
