三氯化钛还原—重铬酸钾滴定法测定铁酸钙中Fe_2O_3  

Determination of Fe_2O_3 in Monocalcium Ferrite by Titanium Trichloride Reduction-Potassium Dichromate Titration

作　　者：王俊秀 薛明浩 侯俊坤 马清文 

机构地区：[1]山东鲁丽钢铁有限公司,山东寿光262724

出　　处：《山东冶金》2015年第6期51-52,55,共3页Shandong Metallurgy

摘　　要：试样以硫磷混酸溶解后,加盐酸铁转化为氯化铁,用Sn Cl_2预还原大部分Fe^(3+)为Fe^(2+),再用Ti Cl_3定量还原剩余的Fe^(3+)为Fe^(2+),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全铁量,计算出试样中Fe_2O_3的含量。该方法简便、快速,分析结果准确稳定,RSD≤0.001 8%。The sample was dissolved by sulfuric and phosphoric mixed acid, then the hydrochloric acid was added to change iron into ferric chloride. Now, SnCh was used to pre-reduce most of Fe^3＋ to Fe^2＋, after that, TiCh was used to quantitatively reduce the rest of Fe^3＋ to Fe^2＋, taking sodium tungstate as the indicator to indicate the destination of reduction. In the medium of sulfuric and phosphoric mixed acid, with diphenylamine sulfonate as an indicator, the standard solution of potassium dichromate was used to titrate the content of total iron. Then the content of Fe2O3 was calculated. The method is simple, rapid and accurate （the RSD≤0.001 8%）.

关 键 词：铁酸钙 FE2O3 滴定法 三氯化钛 重铬酸钾 

分 类 号：O655.2[理学—分析化学]