硅锰铝铁合金中Si、P、Al、Mn的联合快速分析

摘要

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除干扰元素，分别用钼蓝光度法测定Si和P，EDTA滴定法测定Al。以硝酸及少量氢氟酸溶解试样，在大量磷酸存在的情况下，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Mn。结果表明，该方法操作简便、快速，各元素相对标准偏差≤2.38%，满足炼钢生产需要。%The samples were melted at high temperature with alkaline flux, leached using dilute hydrochloric acid, after acidification and reduction of the manganese, the volume can be keep constant. A part of the test liquid is removed, the interference elements can be separated by optimizing and controlling the measure acidity and precipitation. The silicon and phosphorus are determined by molybdenum blue photometric method respectively, and the aluminum was determined by EDTA titration. Using nitric acid and a small amount of hydrofluoric acid to dissolve the sample, in a large number of the presence of phosphate, the manganese can be determined by the ammonium ferrous sulfate standard solution titration using the perchloric acid to oxidize the Mn2+to Mn3+, using N-phenyl anthranilic acid as the indicator. The results showed that the method has the advantages of simple operation, fastly;the RSDS≤2.38%and can meet the needs of steelmaking production.