Valorisation des rejets miniers du district Pb-Zn de Touissit-Boubker (région orientale-Maroc)
Bibliographic record
Abstract
In Morocco, several mine sites were abandoned after closure without any rehabilitation plan. These sites are characterized by the presence of significant tailings volumes, which has produced significant environmental impacts. The objective of this research is to study the use of mine tailings, sourced from the abandoned Pb-Zn district of Touissit-Boubker (Morocco), as aggregates for surface finishing mortars. The study consist firstly of a fine physical, chemical and mineralogical characterization of mine tailings, followed by an evaluation of tailings-based mortars mechanical properties. The pollution potential of the tailings based mortars was also assessed in this study. The results show that mine tailings are characterized by the presence of high fine content and significant concentrations of As, Cu, Cd, Pb and Zn. The use of tailings as aggregate produces a significant increase in the amount of water needed for mixing mortars as well as a decrease in mechanical strength. The dissolution of Pb and Zn in tailings-based mortars is very limited. Au Maroc, aucun dispositif n’a été mis en place pour gérer l’abandon des anciens sites miniers. Ces derniers sont caractérisés par la persistance d’immenses tonnages de résidus miniers dont la nocivité est à l’origine, dans de nombreux cas, d’importants impacts environnementaux. L’objectif de ce travail de recherche est d’étudier la faisabilité de valorisation des rejets abandonnés du district minier Pb-Zn de Touissit-Boubker (Maroc) comme granulats fins pour mortier de finition. L’étude consiste d’abord en une caractérisation des propriétés physiques, chimiques et minéralogiques des rejets, suivie d’une évaluation des propriétés mécaniques des mortiers confectionnés. L’étude comporte aussi une évaluation du potentiel polluant des mortiers à base de ce type de rejets. Les résultats ont mis en évidence la présence d’une grande proportion de particules fines (< 63µm) et des concentrations élevées en As, Cu, Cd, Pb et Zn dans les rejets miniers. Il a été observé que l’utilisation des rejets miniers comme agrégats, pour la confection de mortiers, engendre une importante augmentation de la demande en eau nécessaire au gâchage ainsi qu’une diminution significative des résistances mécaniques en particulier à court terme. Toutefois, la stabilisation des rejets miniers dans la matrice cimentaire est effective puisque la dissolution du Pb et du Zn s’avère très limitée.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".