In general, in the continuous determination of carbon and sulfur in carbon and sulfur analyzers, the difficulty is sulfur. This is because: first, the sulfur content in steel is much lower than that of carbon, and the content is lowered, the more difficult to measure; second, the sulfide (MnS, FeS) in steel has a higher melting point than the desired carbide (Mn3C, Fe3C). Comparing the ΔG° value of the combustion reaction, the combustion reaction of these sulfides is more difficult than the corresponding carbides; third; comparing the products after combustion, sulfur dioxide has a side reaction, and is easily converted into trioxide under certain conditions. Sulfur, and carbon dioxide does not have this phenomenon.
In the carbon-sulfur joint analyzer, the determination of sulfur is much more difficult than carbon due to the above reasons, and the accuracy of the measurement is also poor. In order to solve this problem, it is necessary to increase the conversion rate of sulfur. This requires a higher combustion temperature and also requires a longer high temperature duration. This is because the conversion rate of sulfur is closely related to the temperature. When the combustion temperature is 1200~1400 °C, the conversion of sulfur is 61-83%; when the temperature is 1450~1510 °C, the conversion of sulfur is 98%. The temperature is high and it is powerful for the conversion of sulfur. In addition, since the melting point of the sulfide is high, the combustion reaction is difficult, so it is necessary to have a sufficient high temperature duration to ensure that the combustion reaction of sulfur is completed. The shortcoming of the initial electric arc furnace at the time of combustion is that it is difficult to meet the requirement of measuring sulfur to combustion conditions. Although the determination of sulfur was solved using an electric arc furnace, the determination of sulfur encountered great difficulties.
Later, in the process of adopting various methods to improve the electric arc furnace, the carbon-sulfur joint test analyzer found a week of excellent additive component - molybdenum trioxide. The role of additives in the electric arc furnace, in addition to fluxing, is also the performance of arc ignition, stable combustion, modification, heating, etc., generally a mixture of several substances. At present, the commonly used additives for electric arc furnaces are a mixture of tin particles, silicon powder and molybdenum trioxide.
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Label: Method for determination of carbon and sulfur in carbon and sulfur analyzer
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