硼铁合金中硅分析方法的研究与应用

Study and Application of the Analysis Methods for Silicon in Ferro-boron

试样以硝酸、氢氟酸溶解,在过量的钾离子和氟离子存在下,使可溶性硅酸定量转化成氟硅酸钾沉淀。沉淀经过滤、洗涤去游离酸后,用热水水解,生成与硅等物质量的氢氟酸,以酚酞为指示剂,再用氢氧化钠标准溶液滴定,分析硅的百分含量,测定结果令人满意。

The sample was dissolved by nitric acid and hydrofluoric acid,and in the presence of excess potassium ion and fluorine ion,the soluble silicic acid was quantitatively turned into the precipitation of potassium fluosilicate. After filtering and washing to get rid of free acid,the precipitation was hydrolyzed with hot water and generated the hydrofluoric acid with the equal quality of silicon,taking phenolphthalein as indicator,the sodium hydroxide standard solution was used to titrate and analyze the percentage content of silicon,and the determination result was satisfactory.