US 12,330,170 B2
Froth flotation cell
Antti Rinne, Espoo (FI)
Assigned to OUTOTEC (FINLAND) OY, Espoo (FI)
Filed by OUTOTEC (FINLAND) OY, Espoo (FI)
Filed on Aug. 31, 2020, as Appl. No. 17/007,878.
Application 17/007,878 is a continuation of application No. PCT/FI2018/050156, filed on Mar. 2, 2018.
Prior Publication US 2020/0391225 A1, Dec. 17, 2020
Int. Cl. B03D 1/14 (2006.01); B03D 1/08 (2006.01); B03D 1/16 (2006.01)
CPC B03D 1/1462 (2013.01) [B03D 1/082 (2013.01); B03D 1/16 (2013.01); B03D 1/1412 (2013.01)] 52 Claims
OG exemplary drawing
 
1. A froth flotation cell for treating mineral ore particles suspended in slurry and for separating the slurry into an underflow and an overflow, the froth flotation cell comprising:
a tank with a center and a perimeter,
a gas supply for introducing flotation gas into the slurry to form froth,
a first froth collection channel surrounding the perimeter of the tank so that an open froth surface (Af) is formed inside the first froth collection channel,
a second froth collection channel arranged between the center of the tank and the first froth collection channel and substantially concentric with the first froth collection channel, the second froth collection channel comprising a first froth overflow lip defining an inner boundary of the second froth collection channel such that the first froth overflow lip is the closest portion of the second froth collection channel to the center of the tank, and
a radial froth collection launder comprising a radial froth overflow lip, and extending from the first froth collection channel towards the second froth collection channel and in fluid communication with the first froth collection channel, the radial froth overflow lip arranged to allow overflow of the slurry and/or of the froth into the radial froth collection launder,
wherein the froth flotation cell has a pulp area (Ap) of at least 15 m2, measured at a height of a mixing area, defined as a part or a zone of a flotation tank in vertical direction where the slurry is agitated, and wherein the froth collected into the second froth collection channel is arranged to be directed to the first froth collection channel, wherein the froth flotation cell further comprises a radial froth crowder comprising a crowding sidewall, and extending from the second froth collection channel to the first froth collection channel, the crowding sidewall arranged to extend above the froth such that overflow of the froth into the radial froth crowder is prevented, wherein an upper edge of the radial froth crowder extends higher in the vertical direction than an upper edge of the second froth collection channel such that overflow of the froth into the first froth collection channel is permitted.