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Sustainability 2017, 9(11), 2013; doi:10.3390/su9112013

Evaluation of Energy Consumption in the Mercury Treatment of Phosphor Powder from Spent Fluorescent Lamps Using a Thermal Process

Department of Environmental Engineering, College of Engineering, Kyonggi University, 154-42, Gwanggyosan-ro, Yeongtong-gu, Gyeonggi-do 16227, Korea
Author to whom correspondence should be addressed.
Received: 31 August 2017 / Revised: 16 October 2017 / Accepted: 24 October 2017 / Published: 3 November 2017
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In a pilot-plant-scale thermal mercury treatment of phosphor powder from spent fluorescent lamps, energy consumption was estimated to control mercury content by the consideration of reaction kinetics. Mercury content was analyzed as a function of treatment temperature and time. The initial mercury content of the phosphor powder used in the thermal process was approximately 3500 mg/kg. The target mercury content in the phosphor powder thermal process of the phosphor powder was 5 mg/kg or less at 400 °C or higher because the target mercury content was recommended by Minamata Convention and Basel Convention. During thermal processing, the reaction rate was represented by a first order reaction with the Arrhenius equation. The reaction rate constant increased with temperature from 0.0112 min−1 at 350 °C to 0.0558 min−1 at 600 °C. The frequency factor was 2.51 min−1, and the activation energy was 6509.11 kcal/kg. Reaction rate constants were used to evaluate the treatment time required to reduce mercury content in phosphor powder to be less than 5 mg/kg. The total energy consumption in a pilot-plant-scale thermal process was evaluated to determine the optimal temperature for removing mercury in phosphor powder. View Full-Text
Keywords: phosphor powder; thermal process; energy consumption; mercury treatment phosphor powder; thermal process; energy consumption; mercury treatment

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Choi, Y.; Rhee, S.-W. Evaluation of Energy Consumption in the Mercury Treatment of Phosphor Powder from Spent Fluorescent Lamps Using a Thermal Process. Sustainability 2017, 9, 2013.

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