Process for manufacturing white pigment containing products

Patent metadata

Field	Value
Publication number	US-9725576-B2
Application number	US-201314414967-A
Country	US
Kind code	B2
Filing date	Aug 8, 2013
Priority date	Aug 20, 2012
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

The present invention concerns a process for manufacturing white pigment containing products. The white pigment containing products are obtained from at least one white pigment and impurities containing material via froth flotation.

First claim

The invention claimed is:

1. A process for manufacturing a white pigment containing product comprising the following steps:
a) providing at least one white pigment and impurities containing material,
b) providing at least one collector agent selected from the group consisting of compounds of formula (1),

wherein
R 1 represents a hydrocarbon group containing from 6 to 30 carbon atoms,
A 1 represents an alkylene group having from 1 to 6 carbon atoms,
E 1 , E 2 and E 3 , are identical or different from each other, each independently chosen from among alkylene oxide groups containing from 1 to 6 carbon atoms,
n 1 , n 2 and n 3 , are identical or different from each other, each independently chosen from an integer which value is from 1 to 20,
p is 1, 2, 3 or 4,
and compounds of formula (2)

wherein
R 21 represents a hydrocarbon group containing from 6 to 30 carbon atoms,
R 22 and R 23 are identical or different from each other, each independently chosen from among hydrocarbon groups containing from 1 to 6 carbon atoms,
R 24 represents hydrogen or a hydrocarbon group containing from 1 to 6 carbon atoms,
A 2 represents an alkylene group having from 1 to 6 carbon atoms, and
q is 1, 2, 3 or 4,
and mixtures of compounds (1) and (2),
c) mixing the white pigment and impurities containing material of step a) and the collector agent of step b) in an aqueous environment to form an aqueous suspension,
d) passing gas through the suspension formed in step c), and
e) recovering the white pigment containing product by removing a white pigment bearing phase from the aqueous suspension obtained after step d).

2. The process according to claim 1 , wherein step d) results in the formation of a froth containing the impurities and a white pigment bearing phase with the white pigment containing product.

3. The process according to claim 1 , wherein the white pigment is selected from the group consisting of a white mineral pigment, natural calcium carbonate, ground calcium carbonate, calcium carbonate-containing mineral material, dolomite, barite, aluminium oxide, titanium dioxide, and any mixture thereof.

4. The process according to claim 1 , wherein the white mineral pigment is an alkaline earth metal carbonate, a calcium carbonate, or ground calcium carbonate (GCC).

5. The process according to claim 1 , wherein the white pigment containing material comprises impurities selected from the group consisting of iron sulphides, iron oxides, graphite, silicates, and any mixture thereof.

6. The process according to claim 5 , wherein the silicates are selected from the group consisting of quartz, a mica, an amphibolite, an feldspar, a clay mineral and any mixture thereon.

7. The process according to claim 5 , wherein the silicate is a white coloured silicate selected from the group consisting of wollastonite, kaolin, kaolinitic clay, calcined kaolinitic clay, montmorillonite, talc, diatomaceous earth, sepiolite, and any mixture thereof.

8. The process according to claim 1 , wherein the white pigment is present in the white pigment and impurities containing material of step a) in an amount from 30 to 99.6 wt.-%, based on the dry weight of the white pigment and impurities containing material, and the impurities are present in the white pigment and impurities containing material of step a) in an amount from 0.4 to 60 wt.-%, based on the dry weight of the white pigment and impurities containing material.

9. The process according to claim 1 , wherein the white pigment is present in the white pigment and impurities containing material of step a) in an amount from 60 to 99.3 wt.-%, based on the dry weight of the white pigment and impurities containing material, and the impurities are present in the white pigment and impurities containing material of step a) in an amount from 0.7 to 40 wt.-%, based on the dry weight of the white pigment and impurities containing material.

10. The process according to claim 1 , wherein the white pigment is present in the white pigment and impurities containing material of step a) in an amount from 80 to 99 wt.-%, based on the dry weight of the white pigment and impurities containing material, and the impurities are present in the white pigment and impurities containing material of step a) in an amount from 1 to 20 wt.-%, based on the dry weight of the white pigment and impurities containing material.

11. The process according to claim 1 , wherein the white pigment and impurities containing material of step a) has a weight median grain diameter in the range of from 1 to 1000 μm.

12. The process according to claim 1 , wherein the white pigment and impurities containing material of step a) has a weight median grain diameter in the range of from 5 to 500 μm.

13. The process according to claim 1 , wherein the white pigment and impurities containing material of step a) has a weight median grain diameter in the range of from 10 to 80 μm.

14. The process according to claim 1 , wherein the compound of formula (1) possesses the following characteristics:
R 1 represents a straight or branched hydrocarbon group containing from 8 to 26 carbon atoms, optionally containing one or more insaturation(s), in the form of double and/or triple bond(s),
A 1 represents a straight or branched alkylene group having from 2 to 6 carbon atoms,
E 1 , E 2 and E 3 , are identical or different from each other, each independently chosen from among ethylene oxide (OE) group, propylene oxide (OP) group and butylene oxide (OB) group,
n 1 , n 2 and n 3 , are identical or different from each other, each independently chosen from an integer which value is from 1 to 10, and the sum n 1 +n 2 +n 3 ranges from 3 to 9, and
p is 1 or 2.

15. The process according to claim 1 , wherein the compound of formula (1) possesses the following characteristics:
R 1 represents a straight or branched hydrocarbon group containing from 12 to 22 carbon atoms, optionally containing one or more insaturation(s), in the form of double and/or triple bond(s),
A 1 represents a straight or branched alkylene group having from 2, 3 or 4 carbon atoms,
E 1 , E 2 and E 3 , are identical or different from each other, each independently chosen from among an OE group and an OP group,
n 1 , n 2 and n 3 , are identical or different from each other, each independently chosen from an integer which value is from 1 to 10, and the sum n 1 +n 2 +n 3 ranges from 3 to 9, and
p is 1.

16. The process according to claim 1 , wherein the compound of formula (2) possesses the following characteristics:
R 22 and R 23 are identical or different from each other, each independently chosen from among hydrocarbon groups containing from 1 to 4 carbon atoms,
R 24 represents hydrogen,
A 2 represents an alkylene group having 1, 2, 3 or 4 carbon atoms, and
q is 1 or 2.

17. The process according to claim 1 , wherein the compound of formula (2) possesses the following characteristics:
R 22 and R 23 are identical or different from each other, each independently chosen from among methyl, ethyl, propyl and butyl,
R 24 represents hydrogen,
A 2 is ethylene or propylene, and
q is 1.

18. The process according to claim 1 , wherein the collector agent of step b) consists of one or more compounds of formula (1) or con

Assignees

• Omya Int Ag

Inventors

• Sötemann Jörg

Classifications

• B03D1/01

  containing nitrogen · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C08K5/20 Primary

  Carboxylic acid amides · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C01P2006/60

  Optical properties, e.g. expressed in CIELAB-values · CPC title