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1. NZ570813 - Process for the acid digestion of metal-containing compounds

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

P570813

PF 0000057686/PP

- 13-


RECIEVED IPONZ 04 AUGUST 2010

P570813

- 14 -

What we claim is:

1. A process for the acid digestion of metal-comprising compounds by leaching by means of an aqueous leachant, wherein the leachant comprises i) one or more alkanesulfonic acids with a propyl, ethyl or methyl moiety and sulfuric acid at a weight ratio of alkanesulfonic acid to sulfuric acid from 1 : 1000 to 1 : 1 , and/or ii) a mixture of one or more salts of alkanesulfonic acids with a propyl, ethyl or methyl moiety and sulfuric acid at a weight ratio of salt of alkanesulfonic acid to sulfuric acid is from 1 : 9 to 1 :99.

2. The process according to claim , wherein the concentration of the sulfuric acid is from 0,1 to 50% by weight.

3. The process according to claim 1 or 2, wherein the leachant comprises from 0.001 to 50% by weight of alkanesulfonic acid.

4. The process according to any of claims 1 to 3, wherein the alkanesulfonic acid is methanesulfonic acid.

5. The process according to any of claims 1 to 4, wherein the salt of alkanesulfonic acid is an ammonium, an alkaline or an earthalkaline salt.

6. The process according to any of claims 1 to 5, wherein the salt of alkanesulfonic acid is a salt of methanesulfonic acid.

7. The process according to claim 6, wherein the salt of alkanesulfonic is sodiummethanesulfonate.

8. The process according to any of claims 1 to 7, wherein the leachant comprises one or more nonionic, anionic, cationic or amphoteric surfactants.

9. The process according to claim 8, wherein the surfactant or surfactants in

RECIEVED IPONZ 04 AUGUST 2010

P570813

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a total concentration of from 0.1 to 0.3% by weight in 2% strength aqueous H2S04 solution at 23°C leads to a reduction in the contact angle on glass by at least 10° after 1 second.

10. The process according to any of claims 1 to 9, wherein the metal-comprising compound comprises copper, titanium, CaF2> zinc, lead, molybdenum, antimony, bismuth, mercury, cobalt, nickel, aluminum, lanthanum, lanthanides or uranium.

11. The process according to claim 10, wherein the metal-comprising compound comprises copper, titanium or CaF2.

12. The process according to any of claims 1 to 11 , wherein the process is employed for the winning of copper.

13. An aqueous leachant comprising

a) 0.001 - 50% by weight of one or more alkanesulfonic acids with a propyl, ethyl or methyl moiety,

b) 0.1 - 50% by weight of sulfuric acid and

c) 0 - 5% by weight of one or more nonionic, anionic, cationic or amphoteric surfactants,

wherein the weight ratio of alkanesulfonic acid to sulfuric acid is from 1 : 1000 to 1 : 1.

14. An aqueous leachant comprising

a) 1 - 10 % by weight of one or more salts of alkanesulfonic acids with a propyl, ethyl or methyl moiety,

b) 90 - 99 % by weight of sulfuric acid and

c) 0 - 5% by weight of one or more nonionic, anionic, cationic or amphoteric surfactants,

wherein the weight ratio of salt of alkanesulfonic acid to sulfuric acid is from 1 : 9 to 1 : 99.

RECIEVED IPONZ 04 AUGUST 2010

P570813

- 16 -

15. A process according to claim 1 , substantially as herein described with reference to any one of the accompanying Examples thereof.

16. An aqueous leachant according to claim 13 or claim 14, substantially as herein described with reference to any one of the accompanying Examples thereof.