Synergism Red Mud-Acid Mine Drainage as a Sustainable Solution for Neutralizing and Immobilizing Hazardous Elements

Metals - Tập 11 Số 4 - Trang 620
Hugo Lucas1, Srečko Stopić1, Buhle Xakalashe2, Sehliselo Ndlovu3, Bernd Friedrich1
1IME Process Metallurgy and Metal Recycling, RWTH Aachen University, 52056 Aachen, Germany
2Pyrometallurgy Division, Mintek, Private Bag X3015, Randburg 2125, South Africa
3School of Chemical and Metallurgical Engineering, University of The Witwatersrand, Johannesburg 2000, South Africa

Tóm tắt

Acid mine drainage (AMD) and red mud (RM) are frequently available in the metallurgical and mining industry. Treating AMD solutions require the generation of enough alkalinity to neutralize the acidity excess. RM, recognized as a waste generating high alkalinity solution when it is in contact with water, was chosen to treat AMD from South Africa at room temperature. A German and a Greek RM have been evaluated as a potential low-cost material to neutralize and immobilize harmful chemical ions from AMD. Results showed that heavy metals and other hazardous elements such as As, Se, Cd, and Zn had been immobilized in the mineral phase. According to European environmental standards, S and Cr, mainly present in RM, were the only two elements not immobilized below the concentration established for inert waste.

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Metals

Tập 11 Số 4

620

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