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中南大学学报(英文版)

Journal of Central South University

Vol. 21    No. 8    August 2014

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Regeneration of waste activated carbon after extracting gold with steam under microwave heating: Optimization using response surface methodology
ZUO Yong-gang(左勇刚)1, 2, 3, ZHANG Li-bo(张利波)1, 2, 3, PENG Jin-hui(彭金辉)1, 2, 3, C. SRINIVASAKANNAN4, LIU Bing-guo(刘秉国)1, 2, 3, MA Ai-yuan(马爱元)1, 2, 3

1. Yunnan Provincial Key Laboratory of Intensification Metallurgy
(Kunming University of Science and Technology), Kunming 650093, China;
2. Key Laboratory of Unconventional Metallurgy, Ministry of Education
(Kunming University of Science and Technology), Kunming 650093, China;
3. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology,
Kunming 650093, China
4. Chemical Engineering Program, The Petroleum Institute, P.O. Box 2533, Abu Dhabi, United Arab Emirates

Abstract:The technology that waste activated carbon after extracting gold is regenerated with steam under microwave heating was studied. The influence of the activation temperature, activation duration and steam flow rate on iodine adsorption value and regeneration yield of activated carbon was investigated. The response surface methodology (RSM) technique was utilized to optimize the process conditions. The optimum conditions for the preparation of activated carbon are identified to be activation temperature of 831 °C, activation duration of 40 min and steam flow rate of 2.67 mL/min. The optimum conditions result in an activated carbon with an iodine number of 1048 mg/g and a yield of 40%, and the BET surface area evaluated using nitrogen adsorption isotherm is 1493 m2/g, with total pore volume of 1.242 cm3/g. And the pore structure of activated carbon regenerated is mainly composed of micropores and a small amount of mesopores.

 

Key words: microwave heating; steam; waste activated carbon; extracting; response surface methodology

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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