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Papers by Mostafa Benzaazoua

Research paper thumbnail of Laboratory study of surface paste disposal for sulfidic tailings: Physical model testing

Minerals Engineering, 2011

Research paper thumbnail of Integrated mine tailings management by combining environmental desulphurization and cemented paste backfill: Application to mine Doyon, Quebec, Canada

Research paper thumbnail of Reactivity and mineralogical evolution of an underground mine sulphidic cemented paste backfill

Minerals Engineering, 2006

Research paper thumbnail of Sludge recycling within cemented paste backfill: Study of the mechanical and leachability properties

Minerals Engineering, 2006

Research paper thumbnail of Prediction of Acid Mine Drainage: Importance of Mineralogy and the Test Protocols for Static and Kinetic Tests

Mine Water and the Environment, 2014

ABSTRACT Static tests, which compare the acid-generating potential and acid-neutralizing potentia... more ABSTRACT Static tests, which compare the acid-generating potential and acid-neutralizing potential for a given mine waste (tailings or waste rocks), are characterized by a wide uncertainty zone in which it is impossible to accurately predict the acid-generating potential (AGP). Then, to better assess long-term AGP, kinetic tests are usually performed to provide more information about the reaction rates of the acid-generating and acid-neutralizing minerals. The present work compares the classic Sobek static test with three mineralogical static tests to assess the importance of sample mineralogy in acid mine drainage (AMD) prediction. We also investigated how experimental procedures related to static tests can influence prediction results. We used three synthetic tailings samples made by mixing well-characterized pure minerals in calibrated proportions. Although basically different in their principles and procedures, the modified Sobek and mineralogical static tests gave similar results. These AGP predictions were then validated by the use of a kinetic test. The kinetic test protocol was also modified in this study and the results obtained correlated well with the static test results, in contrast to the standard kinetic test protocol. The present work highlights the limitations of static and kinetic test procedures, and provides recommendations for a better use of these tests for more reliable AMD prediction.

Research paper thumbnail of Acid Mine Drainage at the Abandoned Kettara Mine (Morocco): 1. Environmental Characterization

Mine Water and the Environment, 2008

Research paper thumbnail of Assessment of arsenic immobilization in synthetically prepared cemented paste backfill specimens

Journal of Environmental Management, 2012

Research paper thumbnail of MECHANICAL BEHAVIOUR OF CEMENTED PASTE BACKFILL

Cemented paste backfill is a method increasingly used by modern mines throughout the world due to... more Cemented paste backfill is a method increasingly used by modern mines throughout the world due to increasingly stringent environmental regulations on sulfur -rich tailings. This paper studies the mechanical behavior of cemented paste backf ill with mid term (up to 91 days) and long term (more than 91 days) curing times. Two Canadian sulfur mine tailings samples were used for making various backfill mixtures with three different types of binder : Portland cement- based binder (PC), fly ash-based binder (FP) and slag-based binder (SP). The uniaxial compression test results showed that (qu)SP > (qu)FP ≈ (qu)PC. These tests also showed that for a given type of binder, the kinetics of hydration depends on the tailings properties while the obtained long-term strengths of the paste backfill are very similar. The triaxial compression test results demonstrate that both the cohesion of the backfill increases and the angle of friction decreases with an increase in the percentage of binder m...

Research paper thumbnail of Mineralogical distribution of some minor and trace elements during a laboratory flotation processing of Neves-Corvo ore (Portugal)

International Journal of Mineral Processing, 2002

Research paper thumbnail of Design and Application of Underground Mine Paste Backfill Technology

Geotechnical and Geological Engineering, 2008

Research paper thumbnail of Characterization of cemented paste backfill pore structure using SEM and IA analysis

Bulletin of Engineering Geology and the Environment, 2008

Research paper thumbnail of Field Experimental Cells to Assess the Hydrogeological Behaviour of Store-and-Release Covers Made with Phosphate Mine Waste

Canadian Geotechnical Journal, 2015

ABSTRACT

Research paper thumbnail of Laboratory study of surface paste disposal for sulfidic tailings: Physical model testing

Minerals Engineering, 2011

Research paper thumbnail of Integrated mine tailings management by combining environmental desulphurization and cemented paste backfill: Application to mine Doyon, Quebec, Canada

Research paper thumbnail of Reactivity and mineralogical evolution of an underground mine sulphidic cemented paste backfill

Minerals Engineering, 2006

Research paper thumbnail of Sludge recycling within cemented paste backfill: Study of the mechanical and leachability properties

Minerals Engineering, 2006

Research paper thumbnail of Prediction of Acid Mine Drainage: Importance of Mineralogy and the Test Protocols for Static and Kinetic Tests

Mine Water and the Environment, 2014

ABSTRACT Static tests, which compare the acid-generating potential and acid-neutralizing potentia... more ABSTRACT Static tests, which compare the acid-generating potential and acid-neutralizing potential for a given mine waste (tailings or waste rocks), are characterized by a wide uncertainty zone in which it is impossible to accurately predict the acid-generating potential (AGP). Then, to better assess long-term AGP, kinetic tests are usually performed to provide more information about the reaction rates of the acid-generating and acid-neutralizing minerals. The present work compares the classic Sobek static test with three mineralogical static tests to assess the importance of sample mineralogy in acid mine drainage (AMD) prediction. We also investigated how experimental procedures related to static tests can influence prediction results. We used three synthetic tailings samples made by mixing well-characterized pure minerals in calibrated proportions. Although basically different in their principles and procedures, the modified Sobek and mineralogical static tests gave similar results. These AGP predictions were then validated by the use of a kinetic test. The kinetic test protocol was also modified in this study and the results obtained correlated well with the static test results, in contrast to the standard kinetic test protocol. The present work highlights the limitations of static and kinetic test procedures, and provides recommendations for a better use of these tests for more reliable AMD prediction.

Research paper thumbnail of Acid Mine Drainage at the Abandoned Kettara Mine (Morocco): 1. Environmental Characterization

Mine Water and the Environment, 2008

Research paper thumbnail of Assessment of arsenic immobilization in synthetically prepared cemented paste backfill specimens

Journal of Environmental Management, 2012

Research paper thumbnail of MECHANICAL BEHAVIOUR OF CEMENTED PASTE BACKFILL

Cemented paste backfill is a method increasingly used by modern mines throughout the world due to... more Cemented paste backfill is a method increasingly used by modern mines throughout the world due to increasingly stringent environmental regulations on sulfur -rich tailings. This paper studies the mechanical behavior of cemented paste backf ill with mid term (up to 91 days) and long term (more than 91 days) curing times. Two Canadian sulfur mine tailings samples were used for making various backfill mixtures with three different types of binder : Portland cement- based binder (PC), fly ash-based binder (FP) and slag-based binder (SP). The uniaxial compression test results showed that (qu)SP > (qu)FP ≈ (qu)PC. These tests also showed that for a given type of binder, the kinetics of hydration depends on the tailings properties while the obtained long-term strengths of the paste backfill are very similar. The triaxial compression test results demonstrate that both the cohesion of the backfill increases and the angle of friction decreases with an increase in the percentage of binder m...

Research paper thumbnail of Mineralogical distribution of some minor and trace elements during a laboratory flotation processing of Neves-Corvo ore (Portugal)

International Journal of Mineral Processing, 2002

Research paper thumbnail of Design and Application of Underground Mine Paste Backfill Technology

Geotechnical and Geological Engineering, 2008

Research paper thumbnail of Characterization of cemented paste backfill pore structure using SEM and IA analysis

Bulletin of Engineering Geology and the Environment, 2008

Research paper thumbnail of Field Experimental Cells to Assess the Hydrogeological Behaviour of Store-and-Release Covers Made with Phosphate Mine Waste

Canadian Geotechnical Journal, 2015

ABSTRACT

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