# US 8,784,678 B2 · Reverse iron ore flotation by collectors in aqueous nanoemulsion

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- Number: US 8,784,678 B2
- Document ID: US8784678B2
- Status: Granted
- Kind: B2
- Application number: 12/669,715
- Filed: 2008-07-18
- Published: 2010-08-26
- Granted: 2014-07-22
- Earliest claimed: 2007-07-20
- Assignees: Clariant GmbH
- Applicants: Antonio Pedro De Oliveira Filho; Wendel Johnson Rodrigues
- Inventors: Antonio Pedro De Oliveira Filho; Wendel Johnson Rodrigues
- Web page: https://patentgrep.com/patent/US8784678B2

## CPC

- B03D 1/02: Froth-flotation processes
- B01F 23/41: Emulsifying
- B01F 23/4105: {Methods of emulsifying}
- B01F 25/44: Mixers in which the components are pressed through slits
- B01F 25/4422: {the surfaces being maintained in a fixed but adjustable position, spaced from each other, therefore allowing the slit spacing to be varied (B01F25/4423 takes precedence)}
- B01F 25/4423: {the surfaces being part of a valve construction, formed by opposed members in contact, e.g. automatic positioning caused by spring pressure}
- B01F 25/46: Homogenising or emulsifying nozzles
- B01F 27/2712: {provided with ribs, ridges or grooves on one surface}
- B01F 33/8212: {with moving and non-moving stirring devices}
- B03D 1/0043: {modified so as to contain a polyether group}
- B03D 1/006: Hydrocarbons
- B03D 1/008: containing oxygen
- B03D 1/01: containing nitrogen
- B03D 1/011: {Quaternary ammonium compounds}
- C09K 23/42: Ethers, e.g. polyglycol ethers of alcohols or phenols
- C22B 1/00: Preliminary treatment of ores or scrap
- B03D 2201/02: Collectors
- B03D 2203/04: Non-sulfide ores
- C22B 3/28: Amines
- Y02P 10/20: Recycling
- 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)
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention relates to a process for concentration of silicate-containing minerals and ores by froth flotation, in particular to a reverse flotation process, in the presence of a finely dispersed collecting agent characterized by a specific droplet size distribution.

## Claims

### Claim 1

A nanoemulsion, comprising at least one collector for the flotation of silicate minerals from other minerals, at least one emulsifier, and water, wherein water forms the continuous phase, the average particle size of the collector is from 1 nm to 6 μm, and wherein the collector is a compound comprising at least one nitrogen atom and at least one hydrocarbon group having 6 to 30 carbon atoms; and wherein the collector is present in an amount of 20 to 60 wt.-%, based on the total weight of the nanoemulsion.

### Claim 2 (depends on 1)

The nanoemulsion as claimed in claim 1 wherein the collector is selected from the group consisting of ethermonoamines, etherdiamines, sternamines, hydrocarbon amines, ammonium compounds, and mixtures thereof.

### Claim 3 (depends on 1)

The nanoemulsion as claimed in claim 1, wherein the emulsifier is present in an amount of 0.1 to 20 wt.-%, based on the total weight of the nanoemulsion.

### Claim 4 (depends on 1)

The nanoemulsion as claimed in claim 1, wherein water is present in an amount of 20 to 79.9 wt.-%, based on the total weight of the nanoemulsion.

### Claim 5 (depends on 1)

The nanoemulsion as claimed in claim 1, wherein the particle size of the collector forming the discontinuous phase is from 3 nm to 6 μm.

### Claim 6 (depends on 1)

The nanoemulsion as claimed in claim 1, wherein the emulsifier is an alkoxylated fatty alcohol of formula 11a or 11b
wherein n and m are independently from each other 1 to 30, A and B are independently from each other C2- to C4-alkylene groups and R is a saturated or unsaturated, branched or linear C6 to C30 aliphatic or aromatic hydrocarbon group.

### Claim 7 (depends on 1)

The nanoemulsion as claimed in claim 1, wherein the emulsifier is an alkoxylated fatty alcohol of formula 11a or 11b
wherein n and m are independently from each other from 2 to 10, A and B are independently from each other C2- to C4-alkylene groups and R is a C6 to C20 alkyl, alkylaryl or alkenyl group.