氟硅酸钾法测定高钛铝土矿中二氧化硅  

The Determination on Silicon Dioxide in High Titanium Bauxite by Potassium Fluosilicate Volumetric Method

作　　者：李啸寅[1] 李蓉[1,2] 熊国焕[1] 

机构地区：[1]昆明冶金研究院,云南昆明650031 [2]国家有色金属产品质量监督检验中心(昆明),云南昆明650031

出　　处：《云南冶金》2015年第1期60-62,共3页Yunnan Metallurgy

摘　　要：氟硅酸钾容量法测定高钛铁铝土矿中二氧化硅,由于存在钛和铝,使该法测定结果很不稳定。本实验为克服此现象在强酸介质中加入1~2 m L过氧化氢,使钛形成络合物,消除其影响。指示剂采用硝氮黄,滴定终点由黄突变为紫色,避免滴定终点不明确。The determination of silicon dioxide in high titanium bauxite by potassium fluosilieate volumetric method, the deter- mination results is not stable due to titanium and iron existing. In order to overcome this unstable phenomenon, 1 -2mL hydrogen peroxide is added to the strong acid medium, so the titanium shall form compounds to eliminate its influence. The indicator is nitrazine yellow; the ti- tration end point shall be changed from yellow into purple, in order to avoid the undefined titration end point.

关 键 词：高钛铝土矿 过氧化氢 二氧化硅 氟硅酸钾法 

分 类 号：O655.2[理学—分析化学]