Process for manufacturing white pigment containing products

Patent metadata

Field	Value
Publication number	US-11891522-B2
Application number	US-201715999444-A
Country	US
Kind code	B2
Filing date	Feb 13, 2017
Priority date	Feb 16, 2016
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A process is described 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 white pigment containing products, the process 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 CO represents a saturated or unsaturated, linear or branched acyl group having from 8 to 24 carbon atoms;
R 2 is selected from the group consisting of a
1. Direct bond,
2. a C 1 -C 20 , linear or branched, saturated or unsaturated hydrocarbon chain optionally substituted by one or more —OH group(s), one or more methyl and/or methylene groups, a cycloalkylene group, a cycloalkenylene group and/or an arylene group;

R 3 is selected from the group consisting of a hydrocarbyl group having from 8 to 24 carbon atoms or a group of formula R 5 —O-(A′O) w -T-, wherein;
R 5 represents a hydrocarbyl group having from 8 to 24 carbon atoms;
w is a number within the range from 0 to 20;
A′O is an alkyleneoxy group having from 2 to 4 carbon atoms; and
T represents an alkylene group having from 1 to 6 carbon atoms;

R 4 is selected from the group consisting of a hydrocarbyl group or a benzyl group;
AO represents an alkyleneoxy group having from 2 to 4 carbon atoms;
X represents an anion derived from an alkylating agent R 4 X, wherein X represents halogen, sulphate or carbonate;
x is a number within the range from 1 to 20;
p is a number within the range from 1 to 15;
t is −0 or 1;
y is 0 or 1; and
G represents a group of formula (2);

wherein;
B represents an alkyl group having from 1 to 4 carbon atoms or represents a benzyl group;
s is 1, 2 or 3;
R 4 , X and t are as defined above;
N + in formula (2) is connected to R 3 in formula (1); and
(CH 2 ), is connected to the quaternary nitrogen atom in formula (1);

c) mixing the at least one white pigment and impurities containing material of step a) and the at least one 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 the white pigment bearing phase from the aqueous suspension obtained after step d).

2. The process according to claim 1 , wherein the process comprises conducting an indirect flotation step that forms 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 a white mineral pigment.

4. The process according to claim 3 , wherein the white mineral pigment is an alkaline earth metal carbonate.

5. The process according to claim 4 , wherein the white mineral pigment is a calcium carbonate.

6. The process according to claim 5 , wherein the calcium carbonate is ground calcium carbonate.

7. The process according to claim 3 , wherein the white pigment is selected from the group consisting of natural calcium carbonate, ground calcium carbonate, calcium carbonate-comprising mineral material, dolomite, barite, aluminium oxide, titanium dioxide and mixtures of the foregoing.

8. 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 mixtures thereof.

9. The process according to claim 8 , wherein the silicate is selected from the group consisting of quartz, a mica, an amphibolite, a feldspar, a clay mineral and mixtures thereof.

10. The process according to claim 9 , wherein the silicate is quartz.

11. The process according to claim 8 , wherein the silicate is a white colored silicate selected from the group consisting of wollastonite, kaolin, kaolinitic clay, calcined kaolinitic clay, montmorillonite, talc, diatomaceous earth, sepiolite and mixtures thereof.

12. The process according to claim 1 , wherein the amount of white pigment in the at least one white pigment and impurities containing material of step a) is from 0.1 wt.-% to 99.9 wt.-%, based on the dry weight.

13. The process according to claim 12 , wherein the amount of white pigment in the at least one white pigment and impurities containing material of step a) is from 30 wt-% to 99.7 wt.-% based on the dry weight.

14. The process according to claim 12 , wherein the amount of white pigment in the at least one white pigment and impurities containing material of step a) is from 60 wt.-% to 99.3 wt.-% based on the dry weight.

15. The process according to claim 12 wherein the amount of white pigment in the at least one white pigment and impurities containing material of step a) is from 80 wt.-% to 99 wt.-% based on the dry weight.

16. The process according to claim 1 , wherein the ratio of white pigment: impurities in the at least one white pigment and impurities containing material of step a) is from 0.1:99.9 to 99.9:0.1, based on the dry weight.

17. The process according to claim 16 , wherein the ratio is from 30:70 to 99.7:0.3.

18. The process according to claim 16 , wherein the ratio is from 60:40 to 99.3:0.7.

19. The process according to claim 16 , wherein the ratio is from 80:20 to 99:1.

20. The process according to claim 1 , wherein the at least one white pigment and impurities containing material of step a) has a weight median grain diameter in the range of from 1 μm to 1,000 μm.

21. The process according to 20 , wherein the diameter is from 3 μm to 700 μm.

22. The process according to claim 20 , wherein the diameter is from 5 μm to 500 μm.

23. The process according to claim 20 , wherein the diameter is from 10 μm to 80 μm.

24. The process according to claim 20 , wherein the diameter is from 100 μm to 400 μm.

25. The process according to claim 1 , wherein the wherein in the compound of formula (1):
R 1 CO is selected from the group consisting of a saturated or unsaturated, linear or branched acyl group having 12 to 24 carbon atoms;
R 2 represents an alkylene radical having from 2 to 6 carbon atoms;
R 3 represents a hydrocarbyl group containing from 12 to 24 carbon atoms or a group of formula R 5 —O-(A′O) w -T-; wherein
R 5 represents a hydrocarbyl group having from 12 to 24 carbon atoms;
w is a number ranging from 0 to 10;
A′O represents an alkyleneoxy group having from 2 to 4 carbon atoms; and
T represents an alkylene group having from 1 to 4 carbon atoms;
R 4 represents an alkyl group having from 1 to 4 carbon atoms;
X represents halogen, sulphate or carbonate;
AO represents an alkyleneoxy group having from 2 to 4 carbon atoms;
x is a number within the range from 1 to 10; and
p is a number within the range from 1 to 10.

26. The process according to claim 25 , wherein the acyl group has 14 to 24 carbon atoms.

27. The process according to claim 25 , wherein the acyl group has 16 to 24 carbon atoms.

28. The process according to claim 25 , wherein R 2 is an alkylene radical having 4 carbon atoms.

29. The process according to claim 25 , wherein w represent a number from 0

Assignees

• Omya Int Ag

Inventors

• Sötemann Jörg
• Maier Jörg Andreas

Classifications

• C09C1/021 Primary

  Calcium carbonates · CPC title

• B03D1/011

  Quaternary ammonium compounds · CPC title

• B03D1/018

  Mixtures of inorganic and organic compounds · CPC title

• B03D1/02

  Froth-flotation processes · CPC title

• B03D1/087

  of the sediment, e.g. regrinding · CPC title