碱熔-氟硅酸钾容量法测定硅铁中硅含量应用实践

Practice of Measurement and Determination of Silicon in Ferrosilicon with Alkali Fusion-Potassium Fluosilicate Volumetric Method

为满足天铁物料和产品化验需要,根据氟硅酸钾沉淀分离-酸碱滴定原理,通过改变熔样方法、浓度、温度及指示剂条件等,排除不确定因素对分析结果的干扰,对国家标准方法和经典重量法进行应用和验证后,研制出一种碱熔氟硅酸钾沉淀法。该方法适用于铁矿石、岩石,矿石及冶金炉渣中,硅含量≥10%～70%的试样(操作的溶液中含Si量在0.5～50mg的范围内)的测定。长期的实践验证了该方法精密度好、准确度高、速度快、经济实用,已作为天铁技术中心化学分析的标准方法。

In order to meet the requirement of material and product experiment at Tiantie,in accordance with potassium fluosilicate precipitation separation-acid base titration principle,the authors develop an alkali fusion-potassium fluosilicate precipitation method after applying and verifying national standard and classical gravimetric method,by changing conditions of fusion sampling method,concentration,temperature and indicator to wipe out the interference of uncertain factors on analyzed results.The said method applies to the measurement and determination of samples containing ≥10%～70% silicon for iron ore,rock,ore and slag(silicon content in test solution within 0.5～50 mg).Long term practice proves high precision and accuracy,fast speed,cheapness and usefulness of the method,which is adopted as a standard method for chemical analysis at Tiantie Technology Center.