# US 5,341,938 A · Method of separating materials in a flotation reactor

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- Number: US 5,341,938 A
- Document ID: US5341938A
- Status: Granted
- Kind: A
- Application number: 08/062,360
- Filed: 1993-05-13
- Granted: 1994-08-30
- Earliest claimed: 1991-03-20
- Assignees: Servicios Corporativos Frisco, S.A. de C.V.
- Inventors: Ulises M. Valenzuela; Guillermo Moguel
- Web page: https://patentgrep.com/patent/US5341938A

## CPC

- B01F 25/104: {characterised by the arrangement of the discharge opening}
- B01F 25/1041: {the mixing chamber being vertical with the outlet tube at its upper side}
- B01F 35/753: {Discharging at the upper side of the receptacle, e.g. by pressurising the liquid in the receptacle or by centrifugal force}
- B03D 1/082: {of the froth product, e.g. washing}
- B03D 1/1412: {with baffles, e.g. at the wall for redirecting settling solids}
- B03D 1/1475: {Flotation tanks having means for discharging the pulp, e.g. as a bleed stream}
- B03D 1/16: with impellers; Subaeration machines {(mixing gases or vapours with liquids B01F23/20)}
- B03D 1/247: {Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type}
- B03D 1/028: {Control and monitoring of flotation processes; computer models therefor}
- B03D 1/1462: {Discharge mechanisms for the froth}
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- B03D: FLOTATION; DIFFERENTIAL SEDIMENTATION (sedimentation in general B01D21/00; in combination with other separation of solids B03B; sink-float separation B03B5/28; detergents, soaps C11D)

## Abstract

A method of separating desired material from undesired material is provided. The method is performed by forming a slurry of material and introducing it into a specially designed flotation reactor chamber. A foam is generated and introduced into the reactor chamber and dispersed into the slurry. A stream of water is provided to separate the undesired portion of the material from the desired portion of the material that has adhered to the bubbles in the foam.

## Claims

### Claim 1

A method of separating desired material from sterile or undesired material comprising the steps of:
forming a slurry of material having portions of desired and undesired material to be separated;
introducing the slurry into a reactor chamber having a lower part, a middle part, and an upper part aligned along a central axis, the upper part having a vertically narrowing section, along the central axis thereof;
generating a foam external of the reaction chamber, said foam comprised of bubbles of a controlled size;
introducing the foam into the lower part of the reactor chamber;
dispersing the slurry into the foam by passing the slurry and foam through a rotatable member in the lower part of the reactor chamber such that the foam is substantially homogeneously dispersed into the slurry as the foam in contact with the aforesaid slurry ascends through the middle part of the reactor chamber to the upper part thereof for a sufficient time to permit particles of the desired material in the slurry to adhere to the bubbles in the foam; and
providing a controlled stream of water to the foam in the upper part of the reactor chamber in the vertically narrowing section to cause separation of undesired material from the particles of the desired material.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of generating the foam comprises the steps of:
introducing a measured flow of gas to a foam generation chamber which includes a porous element past which the gas flows; and
introducing a flow of liquid/frothing agent into the foam generation chamber to form the foam.

### Claim 3 (depends on 1)

The method of claim 1, which further comprises selecting the desired material to be introduced into the chamber from the group consisting of non-metallic ores, lead sulfide, zinc sulfide, copper sulfide, and sulfides of a base metal containing gold or silver.

### Claim 4 (depends on 1)

The method of claim 1, which further comprises selecting the desired material to be introduced into the chamber from the group consisting of metal cations and anions.

### Claim 5 (depends on 1)

The method of claim 1, which further comprises selecting the desired material to be introduced into the chamber from the group consisting of ink and kaolin contained in paper pulp.

### Claim 6 (depends on 1)

The method of claim 1, which further comprises selecting the desired material to be introduced into the chamber to be an aqueous solution of an organic agent.

### Claim 7 (depends on 1)

The method of claim 1, which further comprises selecting the slurry to be introduced into the reaction chamber to be a mixture of the desired material and an organic fluid.

### Claim 8 (depends on 1)

The method of claim 1, which further comprises reducing the rate of ascent of the foam and slurry through the middle part of the reaction chamber to assist in separating undesired material.

### Claim 9 (depends on 1)

The method of claim 1, wherein the step of generating the foam comprises the steps of:
introducing a measured flow of gas to a foam generation chamber having an upper portion and a lower portion which includes a porous element intermediate said upper and lower portions, past which the gas flows; and
introducing a flow of liquid/frothing agent into the upper portion of the foam generation chamber above said porous element to form the foam.