Determination of metallic iron and ferrous oxide in furnace slag by potassium dichromate titration after separation in iodine-ethanol non-aqueous system
WANG Xin1,QU Yue-hua*2,WANG Yi-ling2,WANG Cui-yan3, BAI Xuan3,ZHANG Que1
1. College of Technology, Shenyang TV University, Shenyang 110003,China; 2. Techology Center of AnSteel Co., Ltd., Anshan 114009, China; 3.Chemical Depatment, Anshan Normal College, Anshan 114000,China
Abstract：The determination of metallic iron and ferrous oxide in furnace slag was studied. The leaching effect of five weak acid salt solutions (which could react with metallic iron but not react with ferrous oxide, including lead acetate, copper acetate, ferric chloride-sodium acetate-acetic acid, iodine-potassium iodide and ferric trichloride) and non-aqueous solution (iodine-ethanol solution) on metallic iron were investigated. The iodine-ethanol solution was selected as the leaching agent for metallic iron in furnace slag. 0.200 0 g of furnace slag sample was leached with 50 mL of iodine-ethanol solution for 40 min, then the content of iron in leaching solution and ferrous in residue was determined by potassium dichromate titration, respectively, to obtain the content of metallic iron and ferrous oxide in furnace slag. The experimental method showed that, leaching rate of metallic iron was higher than 97 %, while ferrous oxide was not leached. Compared with the classical ferric chloride leaching reagent, iodine-ethanol system showed better leaching effect of metallic iron. The metallic iron could be totally separated from ferrous oxide and avoided the acid dissolution interference while using ferric trichloride as leaching agent. The steel slag and dephosphorization slag were leached with iodine-ethanol solution and then determined by potassium dichromate titration. The relative standard deviation (RSD) of metallic iron was 4.2% and 4.6 %, respectively. The RSD of ferrous oxide was 0.72 % and 0.62 %, respectively.
王欣,曲月华,王一凌,王翠艳,白轩,张慤. 碘-乙醇非水体系分离—重铬酸钾滴定法测定炉渣中金属铁与氧化亚铁[J]. 冶金分析, 2013, 33(8): 28-32.
WANG Xin,QU Yue-hua,WANG Yi-ling,WANG Cui-yan, BAI Xuan,ZHANG Que. Determination of metallic iron and ferrous oxide in furnace slag by potassium dichromate titration after separation in iodine-ethanol non-aqueous system. , 2013, 33(8): 28-32.
