Aggregation and colloidal stability of fine-particle coal suspensions

Journal Article · Sat Mar 31 23:00:00 EST 1984 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00122a011· OSTI ID:6743961

Schroeder, P R; Rubin, A J

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), Journal Name: Environ. Sci. Technol.; (United States) Vol. 18:4; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
010900* -- Coal
Lignite
& Peat-- Environmental Aspects
AGGLOMERATION
ALUMINIUM COMPOUNDS
ALUMINIUM SULFATES
COAL FINES
COLLOIDS
DISPERSIONS
FLOCCULATION
OXYGEN COMPOUNDS
PH VALUE
PRECIPITATION
SALTS
SEDIMENTATION
SEPARATION PROCESSES
STABILITY
SULFATES
SULFUR COMPOUNDS
SUSPENSIONS