1. Coal Preparation.
Coarse coal versus fine coal circuits.
Role of coal surface properties in fine coal processing.
2. Coal Characteristics Related to Coal Preparation.
Inorganic matter in coal.
Sulfur in coal.
3. Coal Surface Properties.
Coal surface wettability.
Electrical charge at coal/water interface.
Coal porosity and moisture.
Surface components hypothesis.
Patchwork assembly model of coal surface.
Effect of coal rank on floatability.
Floatability of coal macerals.
Experimental methods of characterizing coal wettability.
Contact angle measurements on flat surfaces.
Contact angle measurements on granular material.
4. Coal Floatability.
The tree technique.
The advanced flotation washability (AWF) procedure.
The use of the floatability curves.
Coal and pyrite depressant