Abstract:The carbon in chromite is mainly composed of mixed carbonate carbon. The traditional determination method is non-aqueous titration. However, the tube furnace infrared absorption method can be used to analyze and test the carbon in chromite, which can realize large sample injection, improve the analysis accuracy, reduce the detection limit and greatly improve the work efficiency. The medium carbon in the sample was burned at high temperature in a tube furnace, and all of it was decomposed into carbon dioxide with tungsten trioxide as cosolvent. When the gas flow loaded with carbon dioxide passed through the infrared chamber, the infrared rays were absorbed by the characteristic wavelength of the gas (the infrared absorption wavelength of carbon dioxide: 4.251μm). According to the relationship between the energy difference before and after infrared absorption and the carbon dioxide concentration, the result of carbon in the sample was calculated. High purity calcium carbonate is used as the calibration curve of carbon, so as to realize the accurate determination of carbon content in chromite. The method has been applied to the determination of carbon in chromite, and the relative standard deviation (RSD, n=12) of the determination results is 2%～9%. It has been verified by six national reference materials, and the determined values are consistent with the standard values. The method effectively solves the problems of long carbon determination process and complicated operation in chromite, and can be used for the determination of carbon content in chromite.