scholarly journals Control of Acid Generation from Pyrite Oxidation in a Highly Reactive Natural Waste: A Laboratory Case Study

Minerals ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 89 ◽  
Author(s):  
Yan Zhou ◽  
Michael D. Short ◽  
Jun Li ◽  
Russell C. Schumann ◽  
Roger St. C. Smart ◽  
...  
Keyword(s):  
Pyrite Oxidation ◽  
Acid Generation

A statistical model to relate pyrite oxidation and oxygen transport within a coal waste pile: case study, Alborz Sharghi, northeast of Iran

2013 ◽  
Vol 71 (11) ◽  
pp. 4693-4702 ◽  
Author(s):  
Behshad Jodeiri Shokri ◽  
Hamidreza Ramazi ◽  
Faramarz Doulati Ardejani ◽  
Ali Moradzadeh
Keyword(s):  
Statistical Model ◽  
Oxygen Transport ◽  
Pyrite Oxidation ◽  
Coal Waste ◽  
Coal Waste Pile

Reduction of acid generation in mine tailings through the use of moisture-retaining cover layers as oxygen barriers

1989 ◽  
Vol 26 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Ronald V. Nicholson ◽  
Robert W. Gillham ◽  
John A. Cherry ◽  
Eric J. Reardon
Keyword(s):  
Oxygen Diffusion ◽  
Pyrite Oxidation ◽  
Moisture Retention ◽  
Gaseous Oxygen ◽  
Cover Layer ◽  
Fine Grained ◽  
Acid Generation ◽  
Tailings Remediation ◽  
Diffusion Characteristics ◽  
Oxygen Barriers

Acid production in sulphidic tailings can cause severe degradation of water quality in both subsurface and surface systems. The availability of gaseous oxygen and the rate of diffusion of oxygen through the open pore spaces in the upper zone of the tailings are the critical factors controlling the rate of acid generation. Acid generation can be reduced by applying a fine-grained, nonreactive cover layer to the tailings surface. The key process involves moisture retention by capillary forces so that near-saturated conditions can be maintained even when the cover layer occurs at several metres above the water table. Textured layering of fine over coarse materials improves moisture retention in the fine layer when infiltration exceeds evapotranspiration. The application of such a cover layer can theoretically reduce oxygen diffusion coefficients and rates of acid generation by up to four orders of magnitude. This can represent a substantial difference in the potential treatment costs of tailings seepage. Simplified calculations based on Fick's first law can be applied to preliminary laboratory measurements of diffusion characteristics of potential cover materials to evaluate their effectiveness in decreasing acidification. These concepts and methods provide an initial evaluation before field-scale testing of cover performance. Key words: pyrite oxidation, tailings, remediation, covers, acid generation, oxygen diffusion.

scholarly journals Forensic Engineering Investigation Of Pyrites Expansive Forces And Impact On Long-Term Building Failure

2008 ◽  
Vol 25 (2) ◽  
Author(s):  
Paul G. Carr
Keyword(s):  
Engineering Geology ◽  
Geotechnical Engineering ◽  
Pyrite Oxidation ◽  
Foundation Design ◽  
Highway Engineering ◽  
Forensic Engineering ◽  
Engineering Investigation

There Is A Dearth Of Information Available In The Literature And Published Engineering Texts Addressing The Impacts Of Pyrite Expansion In Buildings (Mitchell And Soga 2005). The Texts Have Largely Been Silent, And The Intersection Of Engineering Geology, Geotechnical Engineering And Foundation Design Has Been Lacking, With The Exception Of Limited Investigations Related To Highway Engineering. Typically Pyrite Has Been Associated With Shale Materials When Used As Fill. Granite, As Well As Other Rocks And Soil Can Also Contain Sufficient Pyrite To Initiate The Destructive Forces Associated With Pyrite Oxidation. In This Case Study Paper, The Insidious And Destructive Forces Of Pyrite Expansion Are Presented. The Long-Term Implications And Strategies For Remediation Are Considered.

Environmental geochemistry of the Hycroft Mine: a case study on the limitation of Sobek-style acid-generation predictions

2013 ◽  
Vol 13 (3) ◽  
pp. 171-182 ◽  
Author(s):  
Amy Prestia ◽  
Robert Bowell ◽  
Ruth Warrender ◽  
Andrew Barnes ◽  
Deborah Lassiter
Keyword(s):  
Environmental Geochemistry ◽  
Acid Generation

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

Culture and the plasticity of perception

2020 ◽  
Vol 43 ◽  
Author(s):  
Michael Lifshitz ◽  
T. M. Luhrmann
Keyword(s):  
Cultural Context ◽  
Sensory Experience ◽  
Cultural Learning ◽  
The World

Abstract Culture shapes our basic sensory experience of the world. This is particularly striking in the study of religion and psychosis, where we and others have shown that cultural context determines both the structure and content of hallucination-like events. The cultural shaping of hallucinations may provide a rich case-study for linking cultural learning with emerging prediction-based models of perception.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

Sociocultural memory development research drives new directions in gadgetry science

2019 ◽  
Vol 42 ◽  
Author(s):  
Penny Van Bergen ◽  
John Sutton
Keyword(s):  
Episodic Memory ◽  
Autobiographical Memory ◽  
Developmental Psychology ◽  
Cross Cultural ◽  
Memory Development ◽  
Development Research ◽  
Cultural Research ◽  
New Directions ◽  
Cross Cultural Research

Abstract Sociocultural developmental psychology can drive new directions in gadgetry science. We use autobiographical memory, a compound capacity incorporating episodic memory, as a case study. Autobiographical memory emerges late in development, supported by interactions with parents. Intervention research highlights the causal influence of these interactions, whereas cross-cultural research demonstrates culturally determined diversity. Different patterns of inheritance are discussed.

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