Development of a bench-scale Kroll reactor: Experimental results and preliminary findings
Bibliographic record
Abstract
The Kroll process remains the predominant method for large-scale titanium sponge production, involving the reduction of titanium tetrachloride (TiCl₄) with molten magnesium (Mg) under an argon (Ar) atmosphere at 1000-1100 K producing molten magnesium chloride (MgCl 2 ) as a by-product. Despite its widespread industrial use, the Kroll process has received limited attention in the scientific literature, with existing studies presenting limited process data with differing interpretations. This lack of comprehensive understanding has left key reaction mechanisms in the commercial process poorly defined. This study presents four experiments with varying process conditions using a benchtop-scale reactor with high-resolution temperature and pressure instrumentation. These process conditions include, with and without the initial presence of MgCl 2 , varying feed rates and different materials present in the reactor to assess their ability to serve as substrates for Ti-sponge formation. The experimental results showed that the Ti sponge can grow on any substrate material irrespective of electrical conductivity, indicating that electron transport through crucible walls is not essential for Ti growth. Instead, it was found that the capillary action of Mg through porous Ti sponge was the driving force behind the continuation of the reaction. Furthermore, the reaction rate changed throughout the TiCl 4 feed, suggesting a changing surface area where the heterogenous reaction can occur.
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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 | 0.000 |
| 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) | 0.000 | 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 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".