Indirect flotation process for manufacturing white pigment containing products

Patent metadata

Field	Value
Publication number	US-11014096-B2
Application number	US-201816638911-A
Country	US
Kind code	B2
Filing date	Aug 8, 2018
Priority date	Aug 16, 2017
Publication date	May 25, 2021
Grant date	May 25, 2021

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. Process for manufacturing white pigment containing products, characterised in that said process comprises 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 2 is selected from the group consisting of:
i) a direct bond,
ii) a C 1 -C 20 , linear or branched, saturated or unsaturated hydrocarbon chain optionally substituted by one or more —OH group(s), a substituted alkylene radical wherein said alkylene radical is substituted by 1 or 2 —OH groups, an alkenylene radical having from 1 to 20 carbon atoms, and a substituted alkenylene radical, wherein said alkenylene radical is substituted by 1 or 2 methyl and/or methylene groups,
iii) a cycloalkylene,
iv) a cycloalkenylene and
v) an arylene group
R 5 is a C 1 -C 6 hydrocarbyl group,
X is a leaving group,
t is 0 or 1,
p is an integer in the range from 1 to 15,
QO is an alkyleneoxy group containing from 2 to 4 carbon atoms,
q 1 , q 2 , q 3 , q 4 , are independently from each other an integer in the range from 1 to 20,
R 10 is independently from each other selected from the group consisting of R 7 and R 11 , with the proviso that at least one of the R 10 groups is R 7 and at least one other of the R 10 groups is R 11 , wherein
R 7 is selected from the group consisting of a hydrocarbyl group having 1 to 7 carbon atoms, an aryl or an arylalkyl group, a group of formula H—(OA″)v-, wherein v represents an integer of between 1 and 20 and A″O represents an alkyleneoxy group containing from 2 to 4 carbon atoms, HO(CH 2 ) q — and a group of formula (2)

wherein R 8 and R 9 , independently from each other, are selected from among a hydrocarbyl group having 1 to 6 carbon atoms, or R 8 and R 9 , together with the nitrogen atom to which they are linked form a 5-, 6- or 7-atom ring, optionally bearing one or more heteroatom(s) chosen from among oxygen, nitrogen or sulphur and wherein q is an integer in the range from 1 to 10
R 11 is R 1 -(G) y - wherein R 1 is selected from the group consisting of a hydrocarbyl group having 8 to 24 carbon atoms and a group of formula R 4 —O-(A′O) w -T-, wherein R 4 is a hydrocarbyl group having from 8 to 24 carbon atoms, w is an integer in the range from 0 to 20, A′O is an alkyleneoxy group having from 2 to 4 carbon atoms, T is an alkylene group having from 1 to 6 carbon atoms, y is an integer from 0 to 5, and G represents a group of formula (3):

wherein
B is selected from the group consisting of C1-C4 alkyl, aryl and arylalkyl group,
s is 1, 2 or 3 and
R 5 , X and t are as defined above,
and the group (CH 2 ) s is a spacer between the two nitrogen atoms to which it is linked,
c) mixing said white pigment and impurities containing material of step a) and said collector agent of step b) in an aqueous environment to form an aqueous suspension;
d) passing gas through the suspension formed in step c);
e) recovering the white pigment containing product by removing the white pigment bearing phase from the aqueous suspension obtained after step d).

2. Process according to claim 1 , wherein the process involves an indirect flotation step leading to the formation of a froth containing the impurities and a white pigment bearing phase with the white pigment containing product.

3. Process according to claim 1 , wherein the white pigment is a white mineral pigment.

4. Process according to claim 1 , wherein the white pigment is an alkaline earth metal carbonate.

5. Process according to claim 1 , wherein the white pigment containing material comprises impurities selected from the group consisting of base metal sulphides, iron oxides, graphite, silicates and mixtures thereof.

6. Process according to claim 5 , wherein the silicate is selected from the group consisting of quartz, mica, amphibole, feldspar, clay mineral and mixtures thereof.

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

8. Process according to claim 1 , wherein the amount of white pigment in the white pigment and impurities containing material of step a) is from 0.1 to 99.9 wt.-%, based on the dry weight.

9. Process according to claim 1 , wherein the ratio of white pigment: impurities in the 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.

10. 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 5 000 μm.

11. Process according to claim 1 , wherein the compound of formula (1) is characterized in that
R 2 is selected from the group consisting of an alkylene radical of formula —(CH 2 ) z —, in which z is an integer from 1 to 20 and an alkenylene radical having from 1 to 10 carbon atoms, and/or
R 5 is selected from the group consisting of a C 1 -C 4 alkyl group, phenyl and phenylalkyl, and/or
X is selected from the group consisting of halogens, sulphates and carbonates, and/or
p is an integer in the range from 1 to 10, and/or
QO is an alkyleneoxy group containing 2 or 3 carbon atoms and/or
q 1 , q 2 , q 3 , q 4 , are independently from each other an integer of between 1 to 10, and/or
R 7 is selected from the group consisting of a hydrocarbyl group having 1 to 6 carbon atoms, an phenyl or naphthyl group, a group of formula H—(OA″) v -, wherein v is an integer in the range of 1 to 10, and A″O is an alkyleneoxy group containing from 2 to 4 carbon atoms, and HO(CH 2 ) q — and a group of formula (2)

wherein R 8 and R 9 , independently from each other, are selected from among a hydrocarbyl group having 1 to 4 carbon atoms and q is an integer from 1 to 6, and/or
R 11 is R 1 -(G) y - R 1 is selected from the group consisting of a hydrocarbyl group having 10 to 24 carbon atoms, and a group of formula R 4 —O-(A′O) w -T-, wherein R 4 is a hydrocarbyl group having 12 to 24 carbon atoms, w represents an integer ranging from 0 to 20, A′O is an alkyleneoxy group containing 2 to 4 carbon atoms, T is alkylene with 1 to 6 carbon atoms, y is an integer from 0 to 5, 0 or 1 and G represents a group of formula (3):

wherein
B is selected from the group consisting of C 1 -C 4 alkyl, aryl and arylalkyl group,
s is 1, 2 or 3,
and t, is 0 or 1.

12. Process according to claim 1 , wherein the compound of formula (1) is characterized in that
R 2 is selected from the group consisting of a divalent hydrocarbyl radical having from 1 to 10
R 7 is a hydrocarbyl group having 1 to 4 carbon atoms,
R 11 is R 1 -(G) y - R 1 is a hydrocarbyl group having 8 to 24 carbon atoms, and y=0
QO is an ethoxy group and
X is a leaving group.

Assignees

• Omya Int Ag

Inventors

• Sotemann Jorg
• Maier Jorg
• Gilbert David
• Niitti Tomi Matti Juhani

Classifications

• C09C3/04

  Physical treatment, e.g. grinding or treatment with ultrasonic vibrations {(C09C3/006 takes precedence)} · CPC title

• C09C1/021

  Calcium carbonates · CPC title

• B03D2203/005

  Fine and commodity chemicals · CPC title

• B03D2201/02

  Collectors · CPC title

• B03D1/16 Primary

  with impellers; Subaeration machines {(mixing gases or vapours with liquids B01F23/20)} · CPC title