Key Learning Objectives
- Systematic overview of options for solid liquid separation, driving forces and limitations
- Understand the interconnection between critical material properties and process factors on thickening, filtration and centrifugation
- Classification of equipment according to applications and process requirements
- Critical information for selection solid liquid separation equipment (clarifiers, thickeners, filters and centrifuges)
- Bench and pilot scale testwork
- Solid liquid separation fundamentals including dewatering and deliquoring/drying
- Slurry pre-treatment (coagulation, flocculation, pre-coating) and post-treatment (polishing, transport and handling)
- Operation and trouble shooting of solid liquid separation equipment
About the Course
Solid liquid separation (SLS) and dewatering is part of major processing plants in the form of settling or filtration in clarifiers, thickeners, filters and centrifuges.
The huge selection of solid liquid separation equipment, principles and mechanisms requires a clear understanding of capabilities and limitations of available methods and equipments.
Understanding sedimentation and filtration fundamentals, including hindered settling, compression, filtration, deliquoring/drying and centrifugal effects is fundamental requisite for proper selection, sizing and design of SLS plants.
How parameters such as particle size, clay content, cake thickness, filtration pressure or centrifugal speed effect separation performance and also maintenance requirements will be discussed.
The course will focus on identifying what information is required, provide criteria for short-listing equipment types and how to interpret measured data and apply the understanding to new system design and existing operations.
You will learn about pre and post treatment with coagulants, flocculants, pre-coat, body feed and polishing options, filter selection, sizing, proper operation, control, maintenance and trouble shooting.
In an interactive group discussion on trouble-shooting you will have the chance to present and get advice on your particular problems and issues.
Who Will Benefit
Process engineers, metallurgists, design engineers and design project managers looking to improve their performance especially with more complex solid liquid separation processes and flowsheets within the mineral and other processing industries due to finer grind sizes, higher environmental requirements for tailings and more solid liquid separation options and processes.
Particle, slurry and bed (filter cake) characteristics
- Particle size distribution (PSD)
- Solids concentration and density
- Particle morphology (shape)
Pre-treatment of slurries
- Thickening and classification
- Filter aid for pre-coating and body feed
Activity: Describe course expectations and particular operational, design, selection, application or other issues
Solid liquid separation (SLS) overview and classification
- SLS driving forces
- Clarification and thickening
This section will examine case studies from different industries illustrating the various SLS equipments used and comparisons of different SLS methods.
- Single particle settling
- Hindered Settling
Sedimentation equipment and design variations
- Thickener sizing
- Lamella clarifier/thickener
- Conventional thickener
- High rate thickener
- Paste thickener
- Other thickeners
Deep bed filtration/depth filtration
- Design types
Cross flow and membrane filtration
- Membrane filtration (micro-, ultra-filtration and reverse osmosis)
- Membrane module design
- Membrane fouling
- Rotating cross flow filters
Description of solid liquid separation equipment and processes used within participants’ plants, operations or past experiences.
Sediment and cake filtration principles
- Filtration theory
- Operating parameters affecting cake filtration
- Sediment and cake compression principles
Particle and cake washing principles
- Cake washing principles and methods
- Continuous cake washing
- Re-slurry wash
- Wash efficiency
- Counter current washing and decantation
- Desaturation mechanisms
- Capillary force
- Air flow during cake desaturation
Testing and filtration process design
- Laboratory filtration testing
- Pilot scale filtration testing
- Testwork program considerations
- Cycle time determination
Sizing a vacuum and pressure filter based on test data
- Overview: Vacuum filter
- Overview: Pressure filter
Continuous vacuum filter types
- Drum filter
- Disc filter
- Belt filter
- Pan filter
Pressure filter types
- Bag and cartridge filer
- Nutsch filter
- Plate and leaf filter
- Candle filter
- Filter presses
- Belt press filter
- Screw presses
Filter trouble shooting case studies
This section will examine examples of filter issues and methods for trouble shooting.
Centrifugal dewatering fundamentals
- Water in packed beds
- Centrifugal sedimentation
- Centrifugal filtration
- Batch filter centrifuges
- Continuous filter centrifuges
- Decanter/solid bowl centrifuges
- Disc stack separator
Equipment selection and combinations
- Selecting thickeners, centrifuges and filters
- Comparison of vacuum and pressure filters
- Selection procedures
- Thickener filter combinations
- Filtrate polishing
- Coal dewatering
- Flotation concentrate dewatering
- Precipitate and leach residue dewatering
- Tailings dewatering
- Water and wastewater solid liquid separation
- Special solid liquid separation applications
Review and analysis of SLS processes and trouble-shooting or problems occurring in participants’ plants, operations and experiences.
- Filter cloth
- Screen, mesh and wedge wire
Wrap up and discussion
On-site & in-house training
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