METHOD FOR THE TREATMENT OF ALUMINUM IN A FURNACE

摘要

The invention relates to a method for the treatment of aluminum in a furnace, wherein a material containing aluminum and optionally one or several salts is introduced into the furnace, the material is melted by adding heat with the aid of at least one burner supplied with a combustive agent and combustible in order to obtain melted aluminum which is optionally covered with a slag comprising alumina and at least one salt, and the concentration of carbon monoxide COm and/or hydrogen H2m in the furnace or in the vapors exiting from the furnace is measured. The combustive agent supplied to the at least one burner comprises more than 10 % oxygen by volume, preferably more than 21 % oxygen by volume and the method comprises a final reduction phase for the oxidation of the melted aluminum during which the combustive agent flow is substantially constant while the flow of combustible injected into at least one burner is selected according to the concentration of metal oxide carbon monoxide COc and/or metal oxide hydrogen H2c in the atmosphere or vapors or vice versa. The concentration metal oxide carbon monoxide COmo and/or metal oxide hydrogen H2mo is calculated as the difference in the measured species concentration and the intrinsic CO or H2 species concentration caused by combustion of the combustible and combustive agent in the furnace with the at least one burner with the absence of a charge in the furnace.