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Efficiency Of Ball Milled South African Bentonite Clay For Remediation Of Acid Mine Drainage | 45826
ISSN: 2469-9764

Industrial Chemistry
Open Access

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Efficiency of ball milled South African bentonite clay for remediation of acid mine drainage

International Conference on Industrial Chemistry

Vhahangwele Masindi, Mugera W Gitari, Hlanganani Tutu and Marinda DeBeer

University of Venda, South Africa University of the Witwatersrand, South Africa CSIR-Building Science and Technology, South Africa CSIR-National Centre for Nano-Structured Materials, South Africa

Posters & Accepted Abstracts: Ind Chem

DOI: 10.4172/2469-9764.C1.003

The feasibility of using vibratory ball milled South African bentonite clay for neutralisation and attenuation of inorganic contaminants from acidic and metalliferous mine effluents has been evaluated. Treatment of acid mine drainage (AMD) with bentonite clay was done using batch laboratory assays. Parameters optimised included contact time, adsorbent dosage and adsorbate concentration. Ball milled bentonite clay was mixed with simulated AMD at specific solid: liquid (S/L) ratios and equilibrated on a table shaker. Contact of AMD with bentonite clay led to an increase in pH and a significant reduction in concentrations of metal species. At constant agitation time of 30 min, the pH increased with the increase in dosage of bentonite clay. Removal of Mn2+, Al3+, and Fe3+ was greatest after 30 min of agitation. The adsorption affinity obeyed the sequence: SO4 2- (221.8 mg g-1) > Mn (30.7 mg g-1) > Al (30.5 mg g-1) > Fe (30.2 mg g-1). The pH of reacted AMD ranged from ≈3 to 6. Bentonite clay showed high adsorption capacities for Al and Fe at concentration < 500 mg/L, while the capacity for Mn was lower. Adsorption capacity for sulphate was >50%. Adsorption kinetics revealed that the suitable kinetic model describing data was pseudo-second-order hence confirming chemisorption. Adsorption isotherms indicated that removal of metals fitted the Langmuir adsorption isotherm for Fe and sulphate and the Freundlich adsorption isotherm for Al and Mn, respectively. Ballmilled bentonite clay showed an excellent capacity in neutralising acidity and lowering the levels of inorganic contaminants in acidic mine effluents.

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