论文部分内容阅读
含锶硅铁中锶的含量约0.5—8%。除主成分硅、铁外,还含有钙、铝、锰及其它重金属元素。用经典方法测定手续繁琐,原子吸收测定较多,化学分析较少。本法采用硝氟酸分解试样,在微碱性(pH7.0—7.5)溶液中加入 Na_2S。此期铁、铝、锰及其它重金属离子生成沉淀,滤液中进行锶钙的测定。取一份溶液加入镁盐,以铬黑 T 作指示剂,控制 pH10,用 EDTA 滴定钙、锶含量。取一份溶液,以钙示剂作指示剂,控制
Strontium-containing ferrosilicon in the content of about 0.5-8% strontium. In addition to the main components of silicon, iron, but also contains calcium, aluminum, manganese and other heavy metal elements. With the classic method of determination of cumbersome procedures, atomic absorption determination, less chemical analysis. This method uses nitrofluoric acid decomposition samples, in a slightly alkaline (pH7.0-7.5) solution was added Na2S. During this period iron, aluminum, manganese and other heavy metal ions generated precipitation, strontium calcium in the filtrate determination. Take a solution of magnesium salt, chromium black T as an indicator, control pH10, EDTA titration of calcium and strontium content. Take a solution to calcium indicator for the indicator, control