Abstract
The clean conversion of high-sulfur coal has become one of the top priorities of today's social energy pollution situation and economic development. In this paper, guided by the exploration of high-quality desulfurization technology, the desulfurization method of “reduced iron powder + heat treatment + magnetic separation” is proposed. The effects of the heating temperature, heating time, and coal-to-iron powder ratio on desulfurization were investigated. The morphology of sulfur in high-sulfur coal before and after desulfurization was characterized by field emission scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that part of the sulfur content in raw coal is transferred into recovered iron by the “reduced iron powder + heat treatment + magnetic separation”. Optimized desulfurization was achieved when the temperature was 600 °C for 1 h with a coal to iron ratio of 5:2. The desulfurization rate reached 80.09%. The pyrite was reduced into pyrrhotite and was subsequently magnetically separated. The carbon-sulfur bonds of sulfone, organic sulfonic acid, and aromatic sulfide were broken. This study realizes the centralized capture of reduced iron powder by sulfur in coal, which provides a new method and option for clean coal production and is conducive to improving the carrying capacity of the environment for harmful sulfides.
Published Version
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