Leaching of chromium from coal ash using citric acid, oxalic acid and gluconic acid by batch leaching procedure

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Document Type

Conference Proceeding

Source Title

2014 International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment and Management, HNICEM 2014 - 7th HNICEM 2014 Joint with 6th International Symposium on Computational Intelligence and Intelligent Informatics, co-located with 10th ERDT Conference

Publication Date

1-1-2014

Abstract

This study aims to leach chromium from coal fly ash using citric acid, oxalic acid and gluconic acid. Fly ash obtained from coal ash pond comprises of 28 ppm chromium. After the batch leaching procedure, the results show that 27.66% of chromium was leached using 0.3 M citric acid with the contact time of 8 hours. Also, the order of the ability of the organic acid to leached chromium are as follows citric acid > gluconic acid > oxalic acid. Moreover, mixture of 3 organic acids were used with 0.0317 M citric acid, 0.0266 M oxalic acid and 0.06265 M gluconic acid with varying contact time. Only 8.62% of chromium was leached after 24 hours using mixed organic acid. © 2014 IEEE.

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Digitial Object Identifier (DOI)

10.1109/HNICEM.2014.7016250

Disciplines

Chemical Engineering

Keywords

Leaching; Chromium; Coal ash; Organic acids; Taguchi methods (Quality control)

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