| 摘要 |
PURPOSE:To realize a method for detecting a molten iron component with high accuracy, by preliminarily calculating the correlation of the concn. of a component to be analyzed with light emitting spectrum intensity with respect to a fire point temp. range and actually measuring fire point temp. simultaneously with spectral operation. CONSTITUTION:In a converter 9 for blowing molten iron, an optical fiber 3 is received in the stainless steel guide pipe provided in a lance 2 and a lens 3a is mounted to the leading end thereof in order to observe a fire point 4 during blowing. The optical fiber 3 is connected to a spectroscope 6 and a two-color thermometer 7 and the measure values thereof are inputted to an operation apparatus 8. Herein, before actual operation is started, molten irons stepwise change in the content of Mn contained in molten iron are prepared in an off-line state and fire point temp. is variously changed to investigate the correlation of light emitting spectrum intensity with Mn content and a correlation curve is stored in the apparatus 8. When operation is started to spray pure oxygen to the surface of molten iron from the lance 2 and Mn is hourly detected while fire point temp. is measured by the thermometer 7, detection accuracy can be drastically enhanced. |
