Apparatus and method for flotation separation utilizing an improved spiral spray nozzle

Patent · Mon Mar 16 23:00:00 EST 1987

OSTI ID:6917525

Fistner, D C; McGarry, P E; Herman, D E; Thorpe, J; Treskot, R A

A method is described for froth flotation separation of the components of a slurry having particulate coal therein, the method comprising the steps of: (a) spraying, under a pressure in the range of from about 2 to about 25 psig, under a relatively low back pressure, an input slurry having particulate coal therein through at least one spiral. An open flow spray nozzle is adapted to cause a hollow cone or full cone spray pattern of from about 30/sup 0/ to about 120/sup 0/ of fine droplets so that the particulate coal is dispersed through an aeration zone of increasing cross-sectional area into a liquid surface to create a froth on the surface in which a quantity of the particulate coal is floating; (b) controlling the agitation created by at least one spiral spray nozzle to provide a zone of turbulence extending a limited distance beneath the liquid surface; and (c) removing the froth from the liquid surface.

• Assignee: Standard Oil Co., Cleveland, OH
• Patent Number(s): US 4650567
• OSTI ID: 6917525
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
AERATION
COAL FINES
COAL PREPARATION
DISPERSIONS
DROPLETS
FLOTATION
FUEL SLURRIES
FUELS
INCIDENCE ANGLE
LOW PRESSURE
MEDIUM PRESSURE
MIXTURES
NOZZLES
PARTICLES
SEPARATION PROCESSES
SLURRIES
SPRAYS
SUSPENSIONS
TURBULENCE