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Tribo-electrostatic beneficiation of fly ash for ash utilization

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Abstract

The study was conducted to obtain the scale-up factor and the optimum design criteria for the development of a commercial scale electrostatic separator using a continuous, bench-scale electroseparator composed of two vertical electrode plates and an ejector-tribocharger. Tests of the charge density and separation efficiency to study the removal possibility of unburned carbon from coal fly ash were evaluated under various operating conditions. It was found that the experimental conditions for obtaining the maximum charge density were an air flow rate of 1.75 m3/min and a feed rate of less than 50 kg/hr when operated at lower than 30% relative humidity using a SUS304 ejector tribocharger. Also, the optimum instrument conditions for recovering the clean ash with less than LOI3% at yield over 65% when operated at above experimental conditions were found to be a diffuser slit gap of 4 mm, and a distance between diffuser slit and splitter of 15 cm. Overall, the feed rate per unit electrode surface area was about 0.074 kg/cm2 hr, which can be used as a scale-up factor of the electroseparator.

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Authors and Affiliations

  1. Power Generation Laboratory, Korea Electric Power Research Institute, 305-380, Daejeon, Korea

    Jae-Kwan Kim & Sung-Chul Kim

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  1. Jae-Kwan Kim
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  2. Sung-Chul Kim
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Correspondence to Jae-Kwan Kim.

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Kim, JK., Kim, SC. Tribo-electrostatic beneficiation of fly ash for ash utilization. Korean J. Chem. Eng. 18, 531–538 (2001). https://doi.org/10.1007/BF02698302

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  • DOI: https://doi.org/10.1007/BF02698302

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