Abstract
A technique for the in situ determination of gas components such as CO, CO 2 and H 2O, at pyrometallugical temperatures of more than 1000°C, has been developed in the present investigation. Gases in the experimental furnace are monitored by an infrared optical sensor with a Fourier transform infrared (FT-IR) spectrometer. The infrared optical sensor consists of a water-cooled probe, an infrared optical fiber and a zinc selenide lens. The contents of CO, CO 2 and H 2O are measured at 800–1600°C by this technique, demonstrating that the minimum content of CO detected is less than 100 ppm with an optical depth of 200 mm at 1550°C. Furthermore, changes in partial pressure of gases evolved during the reduction of silicon dioxide (SiO 2) by graphite can be quantitatively analyzed as a practical application.
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