Aggregation and colloidal stability of fine-particle coal suspensions
The aggregation and colloidal stability of colloidal coal suspensions in the presence of varying concentrations of hydrogen ions, neutral salts and aluminium sulphate were investigated. Critical concentration and critical pH values for coagulation and stabilisation were determined from turbidity changes during settling following aggregation. Two colloidal suspensions of a bituminous coal representing stability extremes due to oxidation were compared. In the absence of other coagulants, vigorous oxidation lowered the isoelectric point of the coal sol from pH 5.1 to 1.1 and the pH for stabilisation from 7.5 to 2.6. The oxidised coal sol was slightly less sensitive to neutral salts. The boundaries of settling of the coal in the presence of aluminium sulphate were similar to other hydrophobic sols except for small differences in alkaline solutions.
- OSTI ID:
- 6743961
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 18:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL FINES
AGGLOMERATION
FLOCCULATION
ALUMINIUM SULFATES
COLLOIDS
PH VALUE
SALTS
SEDIMENTATION
STABILITY
SUSPENSIONS
ALUMINIUM COMPOUNDS
DISPERSIONS
OXYGEN COMPOUNDS
PRECIPITATION
SEPARATION PROCESSES
SULFATES
SULFUR COMPOUNDS
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