Patent ID: 11966669
Assignee: JFE STEEL CORPORATION
Field: Measurement (Instruments)
Classification: CPC C  G  Y | IPC C  G

Claim 1:
2. A method of estimating molten metal component, comprising:
estimating component concentrations of a molten metal including a carbon concentration in the molten metal by using:
measurement information about a refining facility including measurement results regarding an optical characteristic at a furnace throat in the refining facility during a blowing process, and
model expressions and model parameters regarding a blowing process reaction including a model expression and model parameters representing a relation between the oxygen efficiency in decarburization and a carbon concentration in the molten metal in the refining facility;

estimating the carbon concentration in the molten metal based on the measurement results;
determining the model expression and the model parameters to be used when estimating the component concentrations of the molten metal based on the estimation result of the carbon concentration in the molten metal;
detecting a time when the intensity change rate shifts from a positive value to a negative value as a time when the carbon concentration in the molten metal reaches a critical carbon concentration, and switching the model expression and the model parameters based on the critical carbon concentration; and
adjusting the component concentration of the molten metal within a desired range at the blowing process based on the estimated component concentration of the molten metal that is estimated to form an adjusted molten metal,
wherein the measurement results include an intensity change rate of a spectrum resulting from an iron oxide reduction reaction in a slag.