Eh-pH Stability Diagrams for Analysis of Polyamine Interaction with Chalcopyrite and Deactivation of Cu-Activated Pyrrhotite
Bibliographic record
Abstract
AbstractAbstractDiethylenetriamine (DETA) and/or triethylenetetramine (TETA) are reagents that can generally be categorized under 'flotation modifiers'. These polyamines are known to be effective for the deactivation/depression of pyrrhotite that is present in Canadian nickel-copper sulphide ores in large quantities. Recent bench scale testing on some of these complex ores indicated that chalcopyrite flotation can also be adversely affected under certain conditions involving polyamines. This observation is consistent with specific affinity of these reagents towards copper ions. In general, DETA shows no significant depressant action on chalcopyrite while TETA's promotion of hydrophilicity for this mineral has been observed even in the presence of xanthate. This prompted an investigation on thermodynamic equilibria involving these polyamines and copper ions. The results serve a useful purpose to identify conditions for deactivation phenomena. CuDETA2+ and CuTETA2+ chelates as products of sequestration have large predominance areas covering a wide range of redox and pH conditions, where copper xanthate species are not stable, especially in the presence of TETA. Résumé Le diéthylènetriamine (DETA) et/ou le triéthylènetétramine (TETA) sont des réactifs que l'on peut généralement catégoriser comme "modificateurs de flottation". On reconnaît que ces polyamines sont efficaces dans la désactivation/dépression de la pyrrhotine que l'on retrouve en grandes quantités dans les minerais canadiens de sulfure de nickel-cuivre. Des essais récents à l'échelle du laboratoire avec certains de ces minerais complexes ont indiqué que la flottation de la chalcopyrite pouvait également être affectée négativement sous certaines conditions impliquant des polyamines. Cette observation est compatible avec l'affinité spécifique de ces réactifs envers les ions de cuivre. En général, le DETA ne montre aucune action déprimante d'importance sur la chalcopyrite alors que l'on a observé la promotion de l'hydrophilie du TETA pour ce minéral, même en présence de xanthate. Ceci a suggéré une investigation des équilibres thermodynamiques impliquant ces polyamines et les ions de cuivre. Les résultats ont pour but utile d'identifier les conditions des phénomènes de désactivation. Les chélates CuDETA2+ et CuTETA2+, comme produits de la séquestration, ont de grandes régions de prédominance couvrant une grande gamme de conditions redox et de pH, où les espèces du xanthate de cuivre ne sont pas stables, particulièrement en présence de TETA.Keywords: DiethylenetriamineTriethylenetetramineChalcopyriteChelation equilibriaEh-pH diagrams
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 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) | 0.002 | 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".