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Modelling the process of kaolinite leaching from a copper mine flotation waste

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Abstract:

This paper presents the results of acidic leaching of kaolinite from the flotation waste of the RTB Bor copper mine, Serbia. The kaolinitic concentrate from the flotation waste contains 32% Al2O3. Kinetic investigations were conducted on the leaching of kaolinite roasted at 750°C for 60 min under air using H2SO4, HNO3 and HCl. Activation energies for the process were 74, 63 and 63.2 kJ mol−1 for sulphuric, nitric and hydrochloric acids, respectively. The kinetic function D3: [1 – (1 – α)1/3]2 = kt was chosen to describe the fractional conversion dependence on time and temperature. This enabled effective management of the leaching process to be carried out.

Keywords: ACIDS; BOR COPPER MINE; H2SO4; HCL; HNO3; KAOLINITE; KINETICS; LEACHING; SERBIA

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/claymin.2010.045.1.107

Publication date: March 1, 2010

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