An Experimental Study of Room Temperature Reoxidation Behavior of Direct H<sub>2</sub>-Reduced Iron in Air
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Bibliographic record
Abstract
Direct reduction of iron ore in hydrogen (25% H 2 /N 2 ) between 450–1050 °C and subsequent room temperature reoxidation of the reduced iron in air was systematically examined using a TGA. The reduced samples with various degrees of metalization were cooled to room temperature in N 2 and then exposed to air. Weight gain due to iron reoxidation was observed. Cyclic reduction and reoxidation runs were also performed at selected reduction temperatures ( T r ). Iron samples obtained at low reduction temperatures (450–850 °C) incurred pyrophoricity, with weight gain increasing with decreasing T r . The weight gain behavior varied with reduction times ( t r ) at different T r . XRD characterization showed wustite, fayalite, and hercynite as intermediate mineral phases during reduction. BET results indicated that increasing T r and t r decreased the surface area and weight gain during reoxidation. The surface area and porous structure predominantly determine the pyrophoricity of the H 2 -reduced iron.
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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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it