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Modelling dewatering behaviour through an understanding of solids formation processes. Part II--solids separation
A C Dustan1, B Cohen, J G Petrie
1Department of Chemical Engineering, University of Cape Town, Rondebosch 7700, South Africa.
Advances in Colloid and Interface Science
|June 7, 2005
Summary
Understanding solids formation and dewatering is key to process optimization. This study links solids characteristics to dewatering behavior, enabling better control and efficiency in industrial processes.
Area of Science:
- Colloid and Surface Science
- Chemical Engineering
- Materials Science
Background:
- Solids formation mechanisms dictate the characteristics of formed solids, influencing dewatering behavior.
- Suspension properties like concentration, particle size, ionic strength, and surface potential determine rheology, but their interdependence complicates prediction.
- Existing models for shear yield stress were adapted to describe compressive rheology, reducing empirical requirements.
Purpose of the Study:
- To dynamically link solids formation and dewatering processes through a unified suspension mechanics model.
- To present and validate models of colloidal interactions and dewatering against experimental batch filtration data.
- To introduce and test a novel method for predicting suspension compressibility and permeability from a single experimental setup.
Main Methods:
- Application of recent shear yield stress models to compressive yield.
- Development and validation of models for colloidal interactions and dewatering.
- Utilizing batch filtration tests for experimental comparison.
- Implementing a novel single-test configuration for predicting suspension compressibility and permeability.
Main Results:
- The study successfully links solids formation characteristics to dewatering behavior via a fundamental suspension mechanics model.
- Models of colloidal interactions and dewatering showed good agreement with experimental batch filtration results.
- A novel approach for predicting suspension compressibility and permeability was presented and validated.
Conclusions:
- The integrated system model provides a dynamic link between solids formation and dewatering, improving process operability.
- Predicting suspension compressibility and permeability through a single test configuration offers a more efficient approach.
- This research contributes to a fundamental understanding and improved control of solids formation and dewatering processes.