摘要
本文应用俄歇电子能谱(AES)等方法系统地研究了产自不同矿床、不同组成黑钨矿的浮选行为,Mn^(2+),Fe^(2+)离子的作用及MnO/FeO比与可浮性的关系,研究表明,经油酸钠处理过的黑钨矿表层MnO/FeO比增高。油酸锰(MnR_2)的生成量和生成速度大于油酸铁(FeR_2)的生成量和生成速度。Mn^(2+)是黑钨矿浮选的活性中心。黑钨矿类质同像系列的可浮性顺序为:钨锰矿大于钨锰铁矿大于钨铁矿。
The relation between the ratio of MnO/FeO of wolframites from severaldeposits and the flotability has been examined by Auger electron spectrometry(AES). Studies of AES make it known that the mechanism of reaction betweenthe collector and wolframites mainly involves chemisorption or surfacechemical reaction. The thickness of adsorption layer is approximately 120×10^(-10)～135×10^(-10)m, which indicates that the chemisorption of sodium oleate on wolf-ramites' surface may be polylayer adsorption. On the other hand, AES revealsthat the content of Mn on wolframite surface treated with collector is higherthan on the mineral substrate. On the basis of crystal field theory and thecalculation of flotation solution chemistry, Mn^(2+) ion may be easily exposed onwolframite surface and reacted with collector in advance. The resultant amountof manganese oleate (MnR_2) is larger and its forming velocity is higher thanthat of iron oleate (FeR_2). It is thought that the reaction of Mn^(2+) with collec-tor plays a leading role in the wolframites' flotation. Therefore, the higher theratio of MnO/FeO, the better the flotability is.
关键词
黑钨矿
浮选
油酸钠
电子能谱法
auger electron spectrometry
wolframite
flotability/sodium oleate
