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1. US20090078087 - 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

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Claims

1- 16. (canceled)
17. A process comprising:
providing a metal-containing compound; and
subjecting the metal-containing compound to an acid digestion comprising contacting the metal-containing compound with an aqueous leachant;
wherein the aqueous leachant comprises a mixture selected from the group consisting of: (i) sulfuric acid and one or more alkanesulfonic acids having alkane moieties selected from the group consisting of propyl, ethyl and methyl groups, at a weight ratio of alkanesulfonic acid to sulfuric acid of 1:1000 to 1:1; (ii) sulfuric acid and one or more salts of alkanesulfonic acids having alkane moieties selected from the group consisting of propyl, ethyl and methyl groups, at a weight ratio of salt of alkanesulfonic acid to sulfuric acid of 1:9 to 1:99.
18. The process according to claim 17, wherein the concentration of the sulfuric acid is 0.1 to 50% by weight.
19. The process according to claim 17, wherein the concentration of the one or more alkanesulfonic acids is 0.001 to 50% by weight.
20. The process according to claim 17, wherein the alkanesulfonic acid comprises methanesulfonic acid.
21. The process according to claim 17, wherein the salt of alkanesulfonic acid comprises an ammonium, an alkaline or an alkaline earth salt.
22. The process according to claim 17, wherein the salt of alkanesulfonic acid comprises a salt of methanesulfonic acid.
23. The process according to claim 17, wherein the salt of alkanesulfonic acid comprises sodiummethanesulfonate.
24. The process according to claim 17, wherein the leachant further comprises one or more surfactants selected from the group consisting of nonionics, anionics, cationics, amphoterics and mixtures thereof.
25. The process according to claim 24, wherein the surfactant is present at a concentration of 0.1 to 0.3% by weight, such that a reduction in the contact angle on glass by at least 10° after 1 second in 2% strength aqueous H 2SO 4 solution at 23° C. is provided.
26. The process according to claim 17, wherein the metal-containing compound comprises a metal component selected from the group consisting of copper, titanium, CaF 2, zinc, lead, molybdenum, antimony, bismuth, mercury, cobalt, nickel, aluminium, lanthanum, lanthanides, uranium or a combination thereof.
27. The process according to claim 17, wherein the metal-containing compound comprises a metal component selected from the group consisting of copper, titanium, CaF 2, and combinations thereof.
28. A copper-winning process comprising the process according to claim 1.
29. An aqueous leachant comprising:
(a) 0.001-50% by weight of one or more alkanesulfonic acids having 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 1:1000 to 1:1.
30. An aqueous leachant comprising:
(a) 1-10% by weight of one or more salts or alkanesulfonic acids having 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 1:9 to 1:99.