Determination of diffusion coefficient for coal leaching process

Sriamoju, S K and Suresh, A and Lingam, R K and Ray, Tathagata and Dash, P S and Banerjee, P K (2010) Determination of diffusion coefficient for coal leaching process. In: Proceedings of the XI International Seminar on Mineral Processing Technology (MPT-2010), Dec 2010, NML Jamshedpur, India.

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Coal leaching process has tremendous applications in the field of thermal and metallurgical industries. Coal leaching with alkaline solution removes silica, alumina and other acidic, ash bearing minerals present in the coal. Leaching with caustic soda has a better effect on the leaching process. In order to improve the leaching kinetics, development of the reaction kinetics is required. Indian coals are of drift origin and the mineral matter present in the coal is embedded inside the organic matter and hence, leaching is reaction controlled followed by diffusion controlled process. For studying the kinetics of the process, shrinking core model was adopted. Coal leaching kinetics at different alkali concentration was studied and diffusion coefficient is determined at room temperature. By using parametric estimation method, diffusion coefficient value obtained (DAe) is 1.2 × 10–10 m2/min and the silica and alumina rate constants are 4 × 10–6 mol/m2.min and 8 × 10–6 mol/m2.min respectively for the leaching of coal with 10% (w/w) caustic solution.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Leaching, Diffusion, Desilication, Kinetics, Mineral matter.
Divisions:Mineral Processing
ID Code:2392
Deposited By:Dr. A K Sahu
Deposited On:19 Jan 2011 12:15
Last Modified:16 Nov 2011 11:51
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