Effect of mechanical variables on the flotation of coarse coal

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Coal Prep. (Gordon and Breach); (United States)

DOI:https://doi.org/10.1080/07349348508945548· OSTI ID:6420520

Bensley, C N; Nicol, S K

Conventional single-feed coal flotation circuits do not efficiently recover coarse particles. Evidence is presented here that this loss of coarse coal is due to an inability to float coarse middlings material. Both flotation yield and selectivity are improved by replacing single feed flotation with split feed flotation incorporating the separate flotation of coarse and fine particles. While optimum yields from the coarse coal circuits are obtained at approximately the same values of aeration rate and impeller speed as for fine coal, coarse particles are much more sensitive to changes in these variables than fine particles. Froth mobility and froth structure are shown to be factors which limit the recovery of coarse coal. Mobile froths and close vanning are required for optimum coarse coal yields. 10 references.

• OSTI ID: 6420520
• Journal Information: Coal Prep. (Gordon and Breach); (United States), Journal Name: Coal Prep. (Gordon and Breach); (United States) Vol. 1:2; ISSN COAPD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
CARBONACEOUS MATERIALS
COAL
COAL FINES
COAL PREPARATION
ENERGY SOURCES
FLOTATION
FOSSIL FUELS
FUELS
MATERIALS
PARTICLE SIZE
PARTICLES
SEPARATION PROCESSES
SIZE
SPECIFICITY
YIELDS