Abstract
ABSTRACT Wet separation of oil shale has problems such as high-water content, low heat efficiency, prolonged drying times, and low operational efficiency, etc. Current fluidized dry separation technology for low-grade oil shale suffers from instability due to the mixed heavy medium properties. This paper employs a high-density dry separation system to conduct an investigation into the separation of low-quality oil shale, Geldart B magnetite powder and Geldart B ferrosilicon ore powder are utilized as the binary heavy medium. The study delves into the impact of varying mixing heavy medium properties on bed flow characteristics, with a thorough analysis of the factors influencing bed stability and the time-domain fluctuation of bed density. The optimal mixing ratio for ensuring separation bed stability has been determined. The experimental results indicate that with the increase in ferrosilicon ore powder content, the range of bed density control expands to 2.34–2.71 g/cm3. In order to ensure the stability of the heavy medium, the appropriate mixing ratio of ferrosilicon ore powder is 50%. At this ratio, the average bed density is 2.50 g/cm3, with a standard deviation of 0.037 g/cm3, resulting in a significant improvement in bed stability.
Published Version
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