An Experimental Study of Room Temperature Reoxidation Behavior of Direct H<sub>2</sub>-Reduced Iron in Air
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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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.000 |
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".