Amine-containing formulations for reverse froth flotation of silicates from iron ore
View Patent ↗The present invention relates to a process for enriching an iron mineral from a silicate-containing iron ore by reverse froth flotation of the ore using a collecting composition comprising: a) a compound of formula R 1 O-A-NH(CH 2 ) n NH 2 (I), wherein R 1 is a straight or branched hydrocarbyl group with 12-15 carbon atoms, A is a group —CH 2 CHXCH 2 —, wherein X is hydrogen or a hydroxyl group, and n is a number 2-6; b) a compound of formula R 2 NH 2 (II), where R 2 is a hydrocarbyl group having 12-14 carbon atoms; c) a compound of formula R 3 NH 2 (III), wherein R 3 is a straight or branched, saturated or unsaturated hydrocarbyl group having 16-22 carbon atoms; and d) optionally a depressing agent for the iron mineral, wherein the amount of a) is at least 65% by weight, based on the total weight of a), b) and c), and at most 90% by weight, based on the total weight of a), b) and c), and wherein the weight ratio between c) and b) is 4:1 to 1:1.
1. A process for enriching an iron mineral from a silicate-containing iron ore by reverse froth flotation of the ore using a collecting composition comprising the step of contacting the ore with the collecting composition, wherein the collecting composition comprises:
a) a compound of formula R 1 O-A-NH(CH 2 ) n NH 2 (I), wherein R 1 is a straight or branched hydrocarbyl group with 12-15 carbon atoms, A is a group —CH 2 CHXCH 2 —, wherein X is hydrogen or a hydroxyl group, and n is a number 2-6;
b) a compound of formula R 2 NH 2 (II), wherein R 2 is a hydrocarbyl group having 12-14 carbon atoms;
c) a compound of formula R 3 NH 2 (III), wherein R 3 is a straight or branched, saturated or unsaturated hydrocarbyl group having 16-22 carbon atoms; and
d) optionally a depressing agent for the iron mineral,
wherein the amount of a) is at least 65% by weight, based on the total weight of a), b) and c), and at most 90% by weight, based on the total weight of a), b) and c), and wherein the weight ratio between c) and b) is 4:1 to 1:1.
2. A process according to claim 1 wherein the weight ratio between c) and b) is 3:1 to 1:1.
3. A process according to claim 1 comprising a further component d) which is a depressing agent for the iron mineral.
4. A process according to claim 3 wherein the depressing agent is chosen from the group of polysaccharides.
5. A process according to claim 4 wherein component d) is starch.
6. A process according to claim 4 wherein component d) is dextrin.
7. A process according to claim 1 wherein c) is a compound (III) wherein R 3 is a hydrocarbyl group having 16-18 carbon atoms.
8. A process according to claim 1 wherein component b) is added as (coco alkyl)amine.
9. A process according to claim 1 wherein the amine components in the collecting composition are present as ammonium salts in an amount of at least 20% by mole.
10. A process according to claim 1 where the collecting composition comprises a) N-(3-isotridecoxypropyl)-1,3-propane diamine, b) a (coco alkyl)monoamine comprising compounds of formula II, wherein R 2 is a hydrocarbyl group with 12-14 carbon atoms, and c) oleylamine.
11. A process according to claim 1 where the amount of a) is at least 70 and at most 80% by weight, based on the total weight of a), b) and c).
12. A collecting composition comprising
a) a compound having the formula R 1 O-A-NH(CH 2 ) n NH 2 (I), wherein R 1 is a straight or branched hydrocarbyl group with 12-15 carbon atoms, A is a group —CH 2 CHXCH 2 —, wherein X is hydrogen or a hydroxyl group, and n is a number 2-6;
b) a compound having the formula R 2 NH 2 (II), wherein R 2 is a hydrocarbyl group having 12-14 carbon atoms;
c) a compound having the formula R 3 NH 2 (III), wherein R 3 is a straight or branched, saturated or unsaturated hydrocarbyl group having 16-22 carbon atoms; and
d) optionally a depressing agent for the iron mineral,
wherein the amount of a) is at least 65% by weight, based on the total weight of a), b) and c), and at most 90% by weight, based on the total weight of a), b) and c), and wherein the weight ratio between c) and b) is 4:1 to 1:1.
13. A collecting composition according to claim 12 wherein the weight ratio between c) and b) is 3:1 to 1:1.
14. A collecting composition according to claim 12 comprising a further component d) which is a depressing agent for the iron mineral.
15. A collecting composition according to claim 14 wherein the depressing agent is chosen from the group of polysaccharides.
16. A collecting composition according to claim 15 wherein component d) is starch.
17. A collecting composition according to claim 15 wherein component d) is dextrin.
18. A collecting composition according to claim 12 wherein c) is a compound (III) wherein R 3 is a hydrocarbyl group having 16-18 carbon atoms.
19. A collecting composition according to claim 12 wherein component b) is added as (coco alkyl)amine.
20. A collecting composition according to claim 12 wherein the amine components in the collecting composition are present as ammonium salts in an amount of at least 20% by mole.
21. A collecting composition according to claim 12 where the collecting composition comprises a) N-(3-isotridecoxypropyl)-1,3-propane diamine, b) a (coco alkyl)monoamine comprising compounds of formula II, wherein R 2 is a hydrocarbyl group with 12-14 carbon atoms, and c) oleylamine.
22. A collecting composition according to claim 12 where the amount of a) is at least 70 and at most 80% by weight, based on the total weight of a), b) and c).