三氯化钛还原-重铬酸钾滴定法测定球团矿中TFe  

Determination of Total Iron in Pellet by Titanium Trichloride Reduction and Potassium Dichromate Titration

作　　者：王际祥[1] 李西忠[1] 董丙成[1] 王成林[1] 吴诚[2] 

机构地区：[1]莱芜钢铁集团有限公司,山东莱芜271104 [2]上海材料研究所,上海200437

出　　处：《山东冶金》2011年第2期52-53,56,共3页Shandong Metallurgy

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.

关 键 词：重铬酸钾滴定法 球团矿 TFe 碱混合熔剂 

分 类 号：O655.23[理学—分析化学]