Method for inhibiting oxidation of metal sulfide-containing material
View Patent ↗The present invention provides means for inhibiting the oxidation of a metal sulfide-containing material, such as ore mine waste rock or metal sulfide taiulings, by coating the metal sulfide-containing material with an oxidation-inhibiting two-tail lipid coating ( 12 ) thereon, thereby inhibiting oxidation of the metal sulfide-containing material in acid mine drainage conditions. The lipids may be selected from phospholipids, sphingolipids, glycolipids and combinations thereof.
1. A method for inhibiting the oxidation of metal sulfide-containing material comprising the step of contacting the metal sulfide-containing material with an effective amount of an oxidation-inhibiting lipid coating comprising a lipid composition comprising one or more two-tail lipid compounds having hydrophilic head groups and two of the same or different hydrophobic groups attached to each of the hydrophilic head groups dispensed in an aqueous medium to inhibit oxidation of the metal sulfide-containing material.
2. The method of claim 1 wherein the metal sulfide-containing material is ore mine waste rock and/or metal sulfide tailings.
3. The method of claim 1 wherein the metal sulfide of the metal sulfide-containing material is selected from the group consisting of pyrite, marcasite and mixtures thereof.
4. The method of claim 1 wherein the hydrophilic head group of the lipid compound is selected from the group consisting of —PO 4 2− , —PO 4 − , —PO 3 2− , —SO 4 2− , —NH 2 , —NH 3 + , primary amines, secondary amines, tertiary amines, —CO 2 − , —OH − , carbonyl functional groups, acyl functional groups and combinations thereof.
5. The method of claim 1 wherein the two hydrophobic groups are attached to the hydrophilic head group of the lipid compound by an ether or ester bond.
6. The method of claim 5 wherein the two hydrophobic groups of the lipid compound are hydrocarbon chains having from about 10 to about 24 carbon atoms.
7. The method of claim 1 wherein the two hydrophobic groups of the lipid compound are hydrocarbon chains having from about 10 to about 24 carbon atoms.
8. The method of claim 1 wherein the lipid compound is selected from the group consisting of phospholipids, sphingolipids, glycolipids and combinations thereof.
9. The method of claim 8 wherein the phospholipids are selected from the group consisting of phosphatidylcholine, phosphatidylethanolamine, phosphatidic acid, phosphatidylinositol, and sphingomyelin.
10. The method of claim 1 wherein the lipid compound is selected from the group consisting of diacyl glycerol, phosphatidyl ethanolamine (PE), disteroylaminopropanediol (DS), phosphatidylglycerol (PG), distearyl phosphatidylcholine (DSPC), Egg Sphingomyelin, 1,2-Dipalmitoyl-SN-Glycero-3-[Phospho-L-Serine] (16:0 PS) 1,2,-Dimyristoyl-SN-Glycero-3-[Phospho-RAC-(1-Glycerol)] (16:0 DGS), 1,2-bis(10,12-tricosadiynoyl)-SN-Glycero-3-Phosphocholine (23:2 Diyne PC) and 1,2-Di-O-Octadecyl-SN-Glycero-3-Phosphocholine (18:0 Diether PC).
11. The method of claim 1 wherein the lipid compound is dispensed in water in a concentration of about 30 μmolar to about 30 milimolar.
12. The method of claim 11 wherein the lipid compound is selected from the group consisting of diacyl glycerol, phosphatidyl ethanolamine (PE), disteroylaminopropanediol (DS), phosphatidylglycerol (PG), distearyl phosphatidylcholine (DSPC), Egg Sphingomyelin, 1,2-Dipalmitoyl-SN-Glycero-3-[Phospho-L-Serine] (16:0 PS) 1,2,-Dimyristoyl-SN-Glycero-3-[Phospho-RAC-(1-Glycerol)] (16:0 DGS), 1,2-bis(10,12-tricosadiynoyl)-SN-Glycero-3-Phosphocholine (23:2 Diyne PC) and 1,2-Di-O-Octadecyl-SN-Glycero-3-Phosphocholine (18:0 Diether PC).
13. A method for treating acid mine drainage comprising the step of contacting a material causing the acid mine drainage with an effective amount of an oxidation-inhibiting lipid coating comprising a lipid composition comprising one or more lipid compounds having hydrophilic head groups and two of the same or different hydrophobic groups attached to each of the hydrophilic head groups dispensed in an aqueous medium.
14. The method of claim 13 wherein the material causing acid mine drainage is a metal sulfide-containing material.
15. The method of claim 14 wherein the metal sulfide-containing material is ore mine waste rock and/or metal sulfide tailings.
16. The method of claim 14 wherein the metal sulfide of the metal sulfide-containing material is selected from the group consisting of pyrite, marcasite and mixtures thereof.
17. The method of claim 13 wherein the hydrophilic head group of the lipid compound is selected from the group consisting of —PO 4 2− , —PO 4 − , —PO 3 2− , —SO 4 2−, —NH 2 , —NH 3 + , primary amines, secondary amines, tertiary amines, —CO 2 − , —OH − , carbonyl functional groups, acyl functional groups and combinations thereof.
18. The method of claim 13 wherein the two hydrophobic groups are attached to the hydrophilic head group by an ether or ester bond.
19. The method of claim 18 wherein the two hydrophobic groups attached to the hydrophilic head group are two hydrocarbon chains having from about 10 to about 24 carbon atoms.
20. The method of claim 13 wherein the two hydrophobic groups attached to the hydrophilic head group of the lipid compound are two hydrocarbon chains having from about 10 to about 24 carbon atoms.
21. The method of claim 13 wherein the lipid compound is selected from the group consisting of phospholipids, sphingolipids, glycolipids and combinations thereof.
22. The method of claim 21 wherein the phospholipids are selected from the group consisting of phosphatidylcholine, phosphatidylethanolamine, phosphatidic acid, phosphatidylinositol, and sphingomyelin.
23. A metal sulfide-containing material having an oxidation inhibiting lipid coating on at least a portion thereof, the lipid coating comprising a lipid composition comprising one or lipid compounds having hydrophilic head groups and two of the same or different hydrophobic groups attached to each of the hydrophilic head groups dispensed in an aqueous medium.
24. The coated metal sulfide of claim 23 wherein the hydrophilic head group of the lipid compound is selected from the group consisting of —PO 4 2− , —PO 4 − , —PO 3 2− , —SO 4 2− , —NH 2 , —NH 3 30 , primary amines, secondary amines, tertiary amines, —CO 2 − , —OH − , carbonyl functional groups, acyl functional groups and combinations thereof.
25. The coated metal sulfide of claim 23 wherein the two hydrophobic groups are attached to the hydrophilic head group by an ether or ester bond.
26. The coated metal sulfide of claim 25 wherein the two hydrophobic groups attached to the hydrophilic head group are two hydrocarbon chains having from about 10 to about 24 carbon atoms.
27. The coated metal sulfide of claim 23 wherein the two hydrophobic groups attached to the hydrophilic head group of the lipid compound are two hydrocarbon chains having from about 10 to about 24 carbon atoms.
28. The coated metal sulfide of claim 23 wherein the lipid compound is selected from the group consisting of phospholipids, sphingolipids, glycolipids and combinations thereof.
29. The coated metal sulfide of claim 28 wherein the phospholipids are selected from the group consisting of phosphatidylcholine, phosphatidylethanolamine, phosphatidic acid, phosphatidylinositol, and sphingomyelin.
30. The coated metal sulfide of claim 23 wherein the lipid compound is selected from the group consisting of diacyl glycerol, phosphatidyl ethanolamine (PE), disteroylaminopropanediol (DS), phosphatidylglycerol (PG), distearyl phosphatidylcholine (DSPC), Egg Sphingomyelin, 1,2-Dipalmitoyl-SN-Glycero-3-[Phospho-L-Serine] (16:0 PS)1,2,-Dimyristoyl-SN-Glycero-3-[Phospho-RAC-(1-Glycerol)] (16:0 DGS), 1,2-bis(10,12-tricosadiynoyl)-SN-Glycero-3-Phosphocholine (23:2 Diyne PC) and 1,2-Di-O-Octadecyl-SN-Glycero-3-Phosphocholine (18:0 Diether PC).