| Abstract Scope |
Novel in-situ analysis techniques characterize the ignition and combustion processes of dropping powder. We developed a new drop tube furnace to observe the reactions of dropping particles. A powder sample and preheated oxygen gas were supplied to a silica glass reaction tube in the drop tube furnace. A high-speed imaging using a high-speed camera and two-color temperature analysis system revealed the morphological changes and temperature of particles during ignition and combustion. The frame rates were 8000 frames per second (fps). The two-color temperature analysis system employed the intensity ratio at λ = 535 and 599 nm to measure the temperature through the silica glass reaction tube. In this study, the ignition and combustion of the primary copper mineral for flash smelting, CuFeS2, were evaluated using the drop tube furnace, high-speed imaging, and two-color temperature analysis system to illustrate the real-time imaging method. |