Stable aqueous composition of neutral collectors and their use in mineral beneficiation processes

Patent metadata

Field	Value
Publication number	US-10105713-B2
Application number	US-201515325916-A
Country	US
Kind code	B2
Filing date	Apr 22, 2015
Priority date	Jul 14, 2014
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

The instant invention relates to a composition in form of a stable aqueous emulsion comprising
a) 1-50 wt.-% of at least one water insoluble thionocarbamate collector selected from the group consisting of dialkyl thionocarbamates, alkyl alkoxycarbonyl thionocarbamates and alkyl allyl thionocarbamates, b) 1-50 wt.-% of one or a mixture of surface active agents of the general formula

wherein
R 1 is a saturated or unsaturated, branched or linear C 3 to C 30 aliphatic or aromatic hydrocarbon group,
R 2 and R 3 are independently from each other hydrogen or a C 1 to C 4 alkyl group,
R 4 is hydrogen or —CH 2 —COOX where X is hydrogen or sodium salt or potassium salt or ammonium salt, and
n and m are independently from each other 0 to 50,

c) 0.1-20 wt.-% of a mixture of at least one alcohol and at least one ether and/or ester,
e) 1-90 wt.-% of water.

First claim

The invention claimed is:

1. A composition in form of a stable aqueous emulsion comprising
a) 1-50 wt.-% of at least one water insoluble thionocarbamate collector selected from the group consisting of dialkyl thionocarbamates, alkyl alkoxycarbonyl thionocarbamates and alkyl allyl thionocarbamates,
b) 1-50 wt.-% of one or a mixture of surface active agents of the general formula

 wherein
R 1 is a saturated or unsaturated, branched or linear C 3 to C 30 aliphatic or aromatic hydrocarbon group,
R 2 and R 3 are independently from each other hydrogen or a C 1 to C 4 alkyl group,
R 4 is hydrogen or —CH 2 —COOX, where X is hydrogen or sodium salt or potassium salt or ammonium salt, and
n and m are independently from each other 0 to 50,

c) 0.1-20 wt.-% of a mixture of at least one alcohol and at least one ether and/or ester, and
e) 1-90 wt.-% of water, wherein the at least one ether corresponds to the formula
R 5 —O—R 6

wherein
R 5 is a linear or branched alkyl or alkenyl group having 2 to 30 carbon atoms and
R 6 is a linear or branched alkyl or alkenyl group having 1 to 30 carbon atoms.

2. The composition of claim 1 wherein the water insoluble thionocarbamate collector is O-isopropyl-N-ethyl-thionocarbamate.

3. The composition of claim 1 , wherein the surface active agent is described by the general formula

wherein
R 1 is a saturated or unsaturated, branched or linear C 3 to C 18 aliphatic or aromatic hydrocarbon group
R 2 and R 3 are independently from each other hydrogen or C 1 to C 4 alkyl group
R 4 is hydrogen and
n and m are independently from each other 0 to 50.

4. The composition as claimed in claim 1 , wherein the alcohol is selected from the group consisting of monohydric alcohols and diols.

5. The composition as claimed in claim 1 , wherein the alcohol comprises a hydrocarbon radical having from 8 to 14 carbon atoms.

6. The composition as claimed in claim 1 , wherein the alcohol has a solubility in water of less than 50 g/liter at 20° C. determined according to the OECD guideline 105 .

7. The composition as claimed in claim 1 , wherein the alcohol is 2-ethylhexanol and/or 2-ethylhexane-(1,3)-diol.

8. The composition as claimed in claim 1 , wherein the ether is cyclic, the ring is formed by R 5 and R 6 and the ring size is from 6 to 30 carbon atoms.

9. The composition as claimed in claim 1 , wherein R 5 is an alkyl or alkenyl group having 4 to 22 carbon atoms.

10. The composition as claimed in claim 1 , wherein R 6 is an alkyl or alkenyl group having 2 to 22 carbon atoms.

11. The composition as claimed in claim 1 , wherein the esters are derived from monobasic or polybasic carboxylic acids having 2 to 30 carbon atoms in the acid radical and monohydric or polyhydric alcohols having 1 to 30 carbon atoms in the alcohol radical.

12. The composition as claimed in claim 11 , wherein the acid radical is an alkyl or alkenyl group having 4 to 22 carbon atoms.

13. The composition as claimed in claim 11 , wherein the alcohol radical is an alkyl or alkenyl group having 2 to 22 carbon atoms.

14. The composition as claimed in claim 1 , wherein the ethers and/or esters are selected from the group consisting of dihexyl ether, dioctyl ether, di-(2-ethylhexyl) ether, oleic acid eicosyl ester, 2-ethylhexyl stearate, 2-ethylhexylic acid butyrate, octanoic acid ethyl ester, hexanoic acid ethyl ester, 2-ethylhexylic acid butyl ester, 2-ethylhexyl butyrate and 2-ethylhexylic acid 2-ethylhexyl ester, adipic acid di(2-ethylhexyl ester), 2-ethylhexane-(1,3)-diol mono-n-butyrate, and 2-ethylhexane-(1,3)-diol di-n-butyrate.

15. The composition as claimed in claim 1 , wherein the mixture of at least one alcohol and at least one ether and/or ester corresponds to the composition

Concentration range

Component
(% by wt.)

Di-2-ethylhexyl ether
10-25 

2-Ethylhexylic acid 2-ethylhexyl ester
10-25 

C 16 -Lactones
4-20

2-Ethylhexyl butyrate
3-10

2-Ethylhexane-(1,3)-diol mono-n-butyrate
5-15

2-Ethylhexanol
4-10

C 4 to C 6 acetates
2-10

2-Ethylhexane-(1,3)-diol
2-5 

Ethers and esters > C 20
0-20

16. The composition as claimed in claim 1 , wherein component c) is a product obtained from distillation residues of the 2-ethyl-1-hexanol production process.

17. The composition as claimed in claim 1 , further comprising an additional water soluble anionic collector (component d) in an amount of 1 to 50 wt.-%, wherein the additional water soluble anionic collector is selected from the group consisting of diisoamyl dithiophosphate, diethyl dithiophosphate, diisopropyl dithiophosphate, diisobutyl dithiophosphate, disecbutyl dithiophosphate, and mercaptobenzothiazolate.

18. The composition as claimed in claim 1 , wherein the median droplet size of the discontinuous phase is from 100 nm to 100 μm.

19. A process for manufacturing a stable aqueous emulsion comprising the steps of mixing a thionocarbamate (component a), selected from the group consisting of dialkyl thionocarbamates, alkyl alkoxycarbonyl thionocarbamates and alkyl allyl thionocarbamates, with a surface active agent (component b) of the general formula

wherein
R 1 is a saturated or unsaturated, branched or linear C 3 to C 30 aliphatic or aromatic hydrocarbon group,
R 2 and R 3 are independently from each other hydrogen or a C 1 to C 4 alkyl group,
R 4 is hydrogen or —CH 2 —COOX, where X is hydrogen or sodium salt or potassium salt or ammonium salt, and
n and m are independently from each other 0 to 50, and a mixture of at least one alcohol and at least one ether and/or ester (component c) and optionally a water soluble, anionic collector (component d) to yiel

Assignees

• Clariant Int Ltd
• Clariant Sa
• Clariant Chile Ltda
• Clariant Sa

Inventors

• De Oliveira Filho Antonio Pedro
• PITARCH LÓPEZ Jesus
• Da Silva Wagner Claudio
• Lipowsky Gunter
• Bezuidenhout Jacques Collin
• Gomez Becerra Jaime Osvaldo
• Caris Andrade Rodrigo Alexis
• Constanzo Yanez Franco Aurelio

Classifications

• B03D2203/02

  Ores · CPC title

• B03D1/012 Primary

  containing sulfur · CPC title

• B03D1/02

  Froth-flotation processes · CPC title

• B03D2203/025

  Precious metal ores · CPC title

• B03D2201/02

  Collectors · CPC title