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Record W151446412 · doi:10.14264/106865

Development of viscosity models for multiphase slag system

2004· dissertation· en· W151446412 on OpenAlex
A. Kondratiev

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aboutThe title or abstract carries a Canadian signal from the geographic lexicon.
no affNo Canadian affiliation: this work is invisible to an affiliation-only frame.
No Canadian affiliation. An affiliation-only frame, the usual design, would never have seen this work. It is one of the works that make the case for inverting the frame.

Bibliographic record

VenueThe University of Queensland · 2004
Typedissertation
Languageen
FieldEngineering
TopicMetallurgical Processes and Thermodynamics
Canadian institutionsnot available
Fundersnot available
KeywordsSlag (welding)ViscositySmeltingProcess engineeringPhase (matter)PyrometallurgyCoalMaturity (psychological)OxideHomogeneousMetallurgyMaterials scienceThermodynamicsEnvironmental scienceWaste managementEngineeringChemistryPhysics

Abstract

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Slags are molten oxides and are present in a number of the high temperature industrialnprocesses, for example, smelting processes used to produce metals and coal gasificationnprocesses used to produce electricity. These complex liquid oxide phases play a key role innremoving unwanted elements from the several hundred million tonnes of metal producednannually as well as in removing massive amounts of coal ashes during the gasificationnprocesses. Given the scale of the industry even small improvements to operating practicenresult in significant economic gains.n n Despite the relative maturity of the metallurgical and coal industries, problems of accuratelynpredicting the physical and chemical properties of complex slags still remain. Understandingnand controlling the behaviour of the slag phase is crucial to improving the technical andneconomic efficiencies of these operations. Viscosity is one of the most important properties ofnthe slags.n n The aim of this project is to develop a general model of the viscosities of complex molten andnmulti-phase slag systems based on the fundamental chemical and structural properties of thenmelts. These fundamental properties will be derived from chemical thermodynamic models,nwhich have recently been developed in collaboration by the research teams of The Universitynof Queensland and The University of Montreal. The fundamental properties derived from thenthermodynamic model will then be related to the viscosity of the homogeneous liquid slag. Innaddition, use of new thermodynamic models in conjunction with the FactSage computerndatabase, will enable the viscosities of multi-phase systems of importance to industrialnoperations to be predicted. The viscosity modelling has the potential for widespread industrialnapplications.n n Summary of the work undertaken by PhD candidate:n mnnnnnnn bnn critical and broad review of scientific literature on the theory ofnnn nn liquid viscosity,nexperimental results and models of the silicaten nn structure, experimental results andnmodels of the viscosity of fully nn liquid as well as partly crystallised silicate meltsn(chaptersn nn 1-6);bnnn modified Urbain viscosity model for fully liquid slags in the Alz03-nn CaO-'FeO'-SiOznsystem at metallic iron saturationnn nn (chapter7);b n heterogeneous viscosity model (Roscoe's equation with newlyn nn optimisedncoefficients in conjunction with thennodynamic nn computer package FactSagec) fornpartly crystallised slags in then nn Ah03-CaO-'FeO'-Si02 system at metallic ironnsaturation (chapter nn 8);b nn application of the Vladimirov/Jak polymeric model to the nn description of the slagnstructure in the Al2)3-n nn CaO-lFeOr-SiO2 system at metallic iron saturation andnestimation nn of the average size of the structural units of viscous flow in this nn systemn(chapter 9);b n nquasi-chemical viscosity model for fully liquid slags in the nn Ah03-CaO-'FeO'-Si02nsystem at metallic iron saturation (chapter nn 10);b n ndevelopment of the high temperature viscosity apparatus (chapter nn 11);n applications of the modified Urbain viscosity model to various industrial processes (coalnblending, slag deposit flow) (chapter 12).n

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Full frame distilled prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Simulation or modeling · Consensus signal: Simulation or modeling
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.411
Threshold uncertainty score0.441

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

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.

Opus teacher head0.013
GPT teacher head0.195
Teacher spread0.182 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it