Abstract
Resource utilization of coal gasification fine ash is restricted by moisture content. Drying and dewatering are indispensable in triboelectrostatic separation. The study aims to determine the minimum required moisture content for effective gasification fine ash separation. Thereinto, experiments reveal a profound influence of moisture content on the electrical properties of gasification fine ash, subsequently impacting the separation process. With higher moisture content, the resistivity and relative dielectric constant of gasification fine ash decrease and increase, respectively. The electrical conductivity of gasification fine ash is enhanced by moisture, but the ability to retain charge is reduced, resulting in a decline in the charge-to-mass ratio. Additionally, severely agglomerated particles and poor separation will be generated by a high moisture content. Comprehensive triboelectrostatic separation experiments demonstrate that gasification fine ash with an additional moisture content of 10% could still be effectively separated yielding carbon-enriched and ash-enriched products with a LOI of 37.17% and 12.47%, respectively. Remarkably, the carbon recovery rate reaches a high of 78.44%. To a certain extent, the drying energy consumption is reduced. This paper provides significant inspiration for resource utilization of coal gasification fine ash.
Published Version
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