Processing

Please wait...

PATENTSCOPE will be unavailable a few hours for maintenance reason on Tuesday 26.10.2021 at 12:00 PM CEST
Settings

Settings

Goto Application

1. WO2002022272 - AQUEOUS COPPER COMPOSITION

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS
1. An aqueous copper composition for use in hydrometallurgical flotation processes comprising a copper component, ammonium hydroxide, and a weak acid.
2. An aqueous copper composition for use in hydrometallurgical flotation processes comprising a copper component, an amine component, and a weak acid.
3. The composition according to claim 2, characterised in that the amine component is an amine selected from a group comprising amines of the general formula RNH2, R2NH, or R3N, wherein R is an alky or aryt group, linear polyamines, branched polyamines, cyclic polyamines, aromatic heterocyclic amines and aliphatic heterocyclic amines.
4. The composition according to claim 3, characterised in that the amine is a water soluble alkyl amine.
5. The composition according to claim 3 or claim 4, characterised in that the amine is ethanolamine, triethanolamine, trimethylamine, triethylamine, or hydroxylamine.
6. The composition according to claim 5, characterised in that the amine is ethanolamine.
7. The composition according to claim 5, characterised in that the amine is triethanolamine.
8. The composition according to any one of claims 2 to 7, characterised in that the amine component is present in an amount from 20 to 45 % (w/w).
9. The composition according to any one of claims 1 to 8, characterised in that the copper component is a water soluble cupric salt.

10. The composition according to claim 9, characterised in that the cupric salt is copper sulphate, copper chloride, copper carbonate, or copper nitrate.
1. The composition according to any one of claims 1 to 10, characterised in that the copper component is present in an amount from 25 to 45 % (w/w).
12. The composition according to any one of claims 1 to 11, characterised in that the weak acid component is an organic carboxylic acid.
13. The composition according to any one of claims 1 to 12, characterised in that the weak acid component is citric acid, tartaric acid, oxalic acid, acetic acid, adipic acid, succinic acid, or sulphamic acid.
14. The composition according to any one of claims 1 to 13, characterised in that the weak acid component serves as a buffering agent.
15. The composition according to any one of claims 1 to 14, characterised in that the weak acid component is a chelating agent.
16. The composition according to any one of claims 1 to 15, characterised in that the weak acid component is present in an amount from 3 to 15 % (w/w).
17. The composition according to any one of claims 1 to 16, characterised in that ammonium hydroxide comprised in the aqueous copper composition is derived from ammonium hydroxide solution (25 % NH3).
18. The composition according to any one of claims 1 to 17, characterised in that the ammonium hydroxide component is present in an amount from 20 to 45 %

(w/w).
19. The composition according to any one of claims 13 to 18, characterised in that the composition comprises from 35 to 45 % (w/w) of copper sulphate, from 35 to 45 % (w/w) of ammonium hydroxide solution (25 % NH3), and from 3 to 12 % (w/w) of citric acid.

20. The composition according to any one of claims 1 to 19, characterised in that the composition has a pH from 7.5 to 11, and a specific gravity of about 1.3.

21. Use of the aqueous copper composition according to any one of claims 1 to 20 as an activator in a hydrometallurgical flotation process.
22. Use of the aqueous copper composition according to any one of claims 1 to 20 for activation of sphalerite, pyrrhotite, marrnatite and arsenopyrite in a hydrometallurgical flotation process.
23. Use of the composition according to claim 21 or claim 22, characterised in that dosage of the composition is in the range from 20 to 40 % (w/w) of standard dosage of copper sulphate.
24. A hydrometallurgical flotation process comprising the step of adding an activator to an ore slurry to be subjected to froth flotation, wherein the activator comprises the aqueous copper composition according to any one of claims 1 to 20.
25. The process according to claim 24, characterised in that the activator is added in an amount from 20 to 40 % (w/w) of the standard amount of copper sulphate added.