Abstract
Abstract—To study the kinetics of the processes occurring in the region where a plasma torch interacts with high-chromium Kh18N10-steel-type iron melts, we investigate the influence of the partial nitrogen pressure in a plasma-forming gas on the decarburization when the melts are processed by an oxidizing plasma in a laboratory setup at a variable oxidation potential. A computer program for processing experimental data is developed. It takes into account the process of inert gas dilution of evolved carbon monoxide and dioxide with allowance for the true character of gas evolution. The kinetic parameters of the plasma decarburization of the high-chromium melts are determined, and the influence of the partial pressures of oxygen and nitrogen in the plasma-forming gas on the process kinetics is detected. The mechanisms of limiting the interaction at various stages of the process are proposed. The influence of nitrogen on the oxidative decarburization in a plasma furnace is studied. The presence of nitrogen in the plasma-forming gas composition is shown to decrease the rate and degree of carbon removal from the melts.
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