Solubility of Hematite in H<sub>2</sub>SO<sub>4</sub>Solutions at 230-270 °c
Bibliographic record
Abstract
An experimental and theoretical investigation of the solubility of hematite (Fe2O3) in H2SO4 solutions at high temperature (230-270 °C) was conducted. Experimental measurements were carried out in a titanium autoclave equipped with a dip tube for sample withdrawal with a porous titanium filter. An electrolyte thermodynamic model was employed to simulate the solubility and speciation of Fe2O3 in H2SO4 solutions. The revised HKF model, which is incorporated into the OLI Systems® software (Version 6.5), was used to calculate thermodynamic properties for aqueous species. The density model was introduced to extrapolate the equilibrium constant for Fe-SO4 complex species. Nonidealities were treated through the Bromley-Zemaitis ion interaction method which is also incorporated in the OLI software. The predicted solubility of Fe2O3 was in very good agreement with the experimental data and in reasonable agreement with other literature data. The predominant species identified were Fe2(SO4)30, Fe(OH)2(SO4)2−, FeSO4+, FeHSO42+ and Fe3+ in the range of H2SO4 concentration 0∼0.7 molality.
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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 | 0.001 |
| 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) | 0.003 | 0.001 |
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; both teacher heads agree on what is shown here.
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".