硅锰铝铁合金中硅、磷、铝、锰的联合快速分析

Rapid United Analysis on Silicon,Phosphorus,Aluminum and Manganese in Si-Mn-Al-Fe Alloy

试样用碱性熔剂经高温熔融,以稀盐酸浸取,酸化并还原高价锰定容后。移取部分试液,通过优化控制测定各元素时的酸度及沉淀分离去干扰元素,分别用钼蓝光度法测定硅和磷,EDTA滴定法测定铝。以硝酸及少量氢氟酸溶解试样,在大量磷酸存在下,用高氯酸氧化Mn2＋为Mn3＋,以N-苯代邻氨基苯甲酸为指示剂,用硫酸亚铁铵标准溶液滴定三价锰,借此测定锰。实验证明,该方法操作简便、快速、且有较好的精密度和准确度,能满足炼钢生产的需要。

The sample was melted at high temperature with alkaline flux, leached with dilute hydrochloric acid, acidified and fixed to a constant volume. Then, a part of solution was taken, through optimizing the acidity control of each measured elements and precipitating, separating the interfering elements, silicon and phosphorus were determined by molybdenum blue photometric method, and Al was detormined by EDTA titration. The sample was dissolved with nitric acid and a little of hydrofluoric acid, and in the presence of a large number of phosphoric acid, the perchloric acid was used to oxidize Mn2 ＋ into Mn3 ＋, taking N-benzene substituted amino benzoic acid as an indicator, the trivalent manganese was determined with the standard solution of ammonium ferrous sulfate, whereby manganese was determined, too. The ex- periment results showed that, this method was simple, rapid and had a good precision and accuracy, and could meet the need of steelmaking production.