摘要
采用碱混合熔剂熔融试样,熔融物以热水浸取盐酸酸化后,用SnCl2-TiCl3将Fe3+还原为Fe2+,以钨酸钠为指示剂指示还原终点;在硫磷混酸介质中,以二苯胺磺酸钠为指示剂,用重铬酸钾标准溶液滴定球团矿中TFe含量。该法测定TFe的绝对误差<0.15%,避免了用重铬酸钾氧化褪去钨蓝色泽时易引入的误差。
The sample was treated with alkali mixed flux fusion,dissolved with hot water and hydrochloric acid.The Fe3＋ was reduced to Fe2＋ by stannous chloride-titanium trichloride with sodium tungstate as indicator to indicate the end.In the H2SO4-H3PO4 medium,the total iron in pellet was titrated by potassium dichromate standard solution with sodium diphenylamine sulfonate as indicator.The absolute error of determination TFe is less than 0.15%,avoiding introduced error by using potassium dichromate oxidation for fading tungsten blue.
出处
《山东冶金》
CAS
2011年第2期52-53,56,共3页
Shandong Metallurgy
关键词
重铬酸钾滴定法
球团矿
TFe
碱混合熔剂
potassium dichromate titration
pellet
total iron
basic mixed flux
