提高微碳铬铁中铬含量的检验稳定性

Improving the Stability of Chromium Content Testing in Microcarbon Ferrochrome

采用国家标准测定铬铁中铬含量,对溶样过程中样品称样量、溶样方式、过硫酸铵酸度、磷酸加入试料及冒烟程度、干扰元素等影响因素进行分析对比,最终确定了磷酸溶样过硫酸铵氧化滴定法。该方法操作简便,分析周期短,采用不同标样进行反复验证后,分析结果的准确度和精密度均很高,满足不锈钢的生产需要。

In this paper,the national standard is used to determine the chromium content in ferrochrome,and the influencing factors such as the sample weight,the dissolution method,the acidity of ammonium persulfate,the addition of phosphoric acid to the test material and the smoke degree,and the interfering elements are analyzed and compared.The method is simple to operate and the analysis period is short.After repeated verification with different standard samples,the accuracy and precision of the analysis results are high,which can meet the needs of stainless steel production.