EDTA滴定法测定钨精矿中的钙量

The EDTA Volumetric Method for the Determination of Calcium Content

采用硫磷混酸分解试样测定钨精矿中钙的含量。钨精矿经硫磷混酸分解,以饱和草酸铵浸取并沉淀钙,与钨、锰、铁、锌等分离,过滤并灼烧成氧化钙,以盐酸溶解,用三乙醇胺掩蔽残留的铁、锰等,以钙黄绿素-百里酚酞作指示剂,于pH值大于12时以EDTA标准溶液滴定。经过标样对照试验及多年工作实践,此法分析结果与国家标准方法结果相吻合,具有较快速、简便、准确的特点,可用于钨精矿及钨矿石中钙元素的分析。

Determine the content of calcium with the mixed acidic thionation decomposition sample in the tungsten concentrates mineral. The mineral of tungsten concentrates was decomposed by mixed acidic thionation; severed with tungsten, manganese, iron, zinc etc.; filtered to calcium oxide; dissolved by hydrochloric acid; indicated by calcein-thymolphthalein and determined by EDTA standard solution titration at the PH value〉12. Through the trial and practice, this result and national standard method result fit together mutually. With the speedy,simple and accurate quality,this method is available for the anylysis of calsium content in tungsten concentrates mine and tungsten mineral stone.