Filtration Tests
In mineral processing, the filtration test assesses the effectiveness of separating
valuable minerals from ore slurry by removing excess water and impurities. This
test determines filtration rate, cake moisture content, and filterability, aiding in
equipment selection and process optimization for efficient mineral recovery while
minimizing water use and maximizing efficiency.
It is necessary to identify what are the objectives, for examples, target moisture,
and what are the candidate filter types such as pressure or vacuum? The slurry
physical and chemical conditions that needs to be replicated in the sample should
include: solids concentrations , particle density and size distribution, slurry pH, and
chemical additives.
Importance of filtration in mineral dewatering
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Improved Product Quality
Efficient Moisture Control
Reduced Environmental Impact
Optimized Processing Efficiency
Equipment Selection
Cost Reduction
Compliance with Regulations
Safety and Handling
Types of Filters
There are typically 2 types of filters
• Pressure Filter
• Vacuum Filter
The Common pressure filters in mineral processing applications are in two basic forms;
• Horizontal
• Vertical
Defined either by orientation of the filter plates or the direction of the pressure is applied.
Types of Filters
Pressure filter:
A pressure filter is a filtration device that uses mechanical pressure to separate
solid particles from liquids. It is commonly used in processes like mineral
dewatering to remove excess water and impurities from slurry or other mixtures.
Some types of pressure filters are;
• Pressure Filter
• Horizontal Pressure Filter
• Vertical Pressure Filter
• Tube Press
Types of Filters
Vacuum Filter:
A vacuum filter is a device that separates solid particles from a liquid by using a
vacuum to draw the liquid through a porous filter, leaving solids behind. It's
commonly used in applications like mineral dewatering to reduce moisture content
in materials.
Some types of vacuum filters are;
• Vacuum Filters
• Batch Vacuum Filters
• Continuous Vacuum Filters
• Rotary Drum Filter
Other Types of Filters
• Disk Filters
• Ceramics Disk Filters
• Horizontal Belt Filter
• Pan Filter
• Hyperbaric Filters
Drying
Drying in mineral processing is a critical step that involves the removal of moisture
from mineral materials to improve their quality, reduce shipping costs, and
facilitate subsequent processing.
Drying is essential in mineral processing for several reasons:
• Enhanced Product Quality
• Reduced Transportation Costs
• Optimized Processing
• Minimized Environmental Impact
Methods of Drying
• Natural Drying
• Mechanical Drying
• Electrostatic Drying
• Microwave Drying