Synthetic clay compositions and methods for making and using
View Patent ↗Selected smectites may be synthesized from a wide variety of components. Morphology, purity, size, and/or shape of the selected smectite may be controlled by mixing the clay smectite formatives, and selectively controlling the pH during mixing. The selected smectites may be used in any applications in which naturally occurring smectite may be used. The selected smectite may also be formulated into an organoclay.
1. A method of making a selected smectite, comprising:
obtaining a metal compound solution, the metal compound solution comprising at least two multivalent metals;
obtaining a silicate solution;
mixing the metal compound solution and the silicate solution, wherein the pH in the mixed solution is maintained at greater than about 7.0, and wherein the metal compound solution and the silicate solution are maintained at a temperature in a range from about 40° C. to about 100° C. during mixing;
controlling the pH to form a selected hydrated metal silicate comprising at least two multivalent metals;
allowing at least a portion of the selected hydrated metal silicate to precipitate; and
using at least a portion of the selected hydrated metal silicate to form a selected smectite.
2. The method of claim 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution.
3. The method of claim 1 , further comprising mixing an alkaline solution with the metal compound solution.
4. The method of claim 1 , further comprising mixing an alkaline solution with the silicate solution.
5. The method of claim 1 , further comprising mixing an alkali fluoride compound with the metal compound solution.
6. The method of claim 1 , further comprising mixing an alkali fluoride compound with the silicate solution.
7. The method of claim 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution, and further comprising mixing an alkali fluoride compound with the alkaline solution.
8. The method of claim 1 , wherein the metal compound solution and the silicate solution during mixing are maintained at a temperature in a range from about 60° C. to about 100° C.
9. The method of claim 1 , wherein the metal compound solution and the silicate solution are stirred during mixing.
10. The method of claim 1 , further comprising heating the mixture of metal compound solution and silicate solution to at least 100° C. subsequent to mixing the metal compound solution and the silicate solution together.
11. The method of claim 1 , further comprising heating the mixture of metal compound solution and silicate solution to at least 150° C. subsequent to mixing the metal compound solution and the silicate solution together.
12. The method of claim 1 , further comprising washing the selected smectite to remove soluble salt compounds.
13. The method of claim 1 , further comprising drying the selected smectite at a temperature range greater than about 600° C.
14. The method of claim 1 , further comprising milling the selected smectite to a powder.
15. The method of claim 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution, and wherein the alkaline solution comprises an alkali carbonate compound.
16. The method of claim 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution, and wherein the alkaline solution comprises an alkali hydroxide.
17. The method of claim 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution, and wherein the alkaline solution comprises sodium carbonate.
18. The method of claim 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution, and wherein the alkaline solution comprises sodium hydroxide.
19. The method of claim 1 , wherein the silicate solution comprises an alkali metal silicate.
20. The method of claim 1 , wherein the silicate solution comprises an alkaline earth metal silicate.
21. The method of claim 1 , wherein the silicate solution comprises a sodium silicate.
22. The method of claim 1 , wherein at least one of the multivalent metals comprises magnesium.
23. The method of claim 1 , wherein at least one of the multivalent metals comprises aluminum.
24. The method of claim 1 , wherein at least one of the multivalent metals comprises iron.
25. The method of claim 1 , wherein at least one of the multivalent metals comprises zinc.
26. The method of claim 1 , wherein at least one of the multivalent metals comprises cobalt.
27. The method of claim 1 , wherein at least one of the multivalent metals comprises chromium.
28. The method of claim 1 , wherein at least one of the multivalent metals comprises vanadium.
29. The method of claim 1 , wherein at least one of the multivalent metals comprises manganese.
30. The method of claim 1 , wherein at least one of the multivalent metals comprises nickel.
31. The method of claim 1 , wherein the multivalent metals comprise a combination of magnesium and aluminum.
32. The method of claim 1 , wherein the metal compound solution comprises water soluble salts of multivalent metals.
33. The method of claim 1 , wherein the metal compound solution comprises an anion.
34. The method of claim 33 , wherein the anion comprises at least one chloride.
35. The method of claim 33 , wherein the anion comprises at least one nitrate.
36. The method of claim 33 , wherein the anion comprises at least one sulfate.
37. The method of claim 33 , wherein the anion comprises at least one nitrite.
38. The method of claim 33 , wherein the anion comprises at least one halide.
39. The method of claim 1 , wherein the pH is controlled such that the metals and silicas are co-precipitated.
40. The method of claim 1 , further comprising mixing one or more lithium compounds with the metal compound solution.
41. The method of claim 1 , further comprising mixing one or more lithium compounds with the silicate solution.
42. The method of 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution and further comprising mixing one or more lithium compounds with the alkaline solution.
43. The method of claim 1 , wherein the metal compound solution is less than about 2.5 M based on at least one metal cation.
44. The method of claim 1 , wherein the silicate solution is about 0.03 M silicate to about 3.5 M silicate.
45. The method of claim 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution wherein the alkaline solution is less than about 3.3 M.
46. The method of claim 1 , wherein the metal compound solution and the silicate solution are mixed in the presence of an alkaline solution wherein the multivalent metals comprise magnesium and aluminum, the alkaline solution comprises carbonate, and the silicate solution comprises sodium silicate.
47. The method of claim 1 , wherein the metal compound solution is mixed in the presence of the silicate solution and an alkaline solution.
48. The method of claim 1 , wherein the silicate solution is mixed in the presence of the metal compound solution and an alkaline solution.
49. The method of claim 1 , wherein the metal compound solution, the silicate solution and an alkaline solution are mixed simultaneously.
50. A method of making a selected smectite, comprising:
obtaining a metal compound solution, the metal compound solution comprising at least two multivalent metals;
obtaining an alkaline solution;
obtaining a silicate solution;
mixing the alkaline solution and the silicate solution to form an alkaline silicate solution, and wherein the pH in the alkaline silicate solution is maintained at greater than about 7.0;
mixing the metal compound solution with the alkaline silicate solution, and controlling the pH during at least a portion of such mixing to form a selected hydrated metal silicate comprising at least two multivalent metals, and wherein the metal compound solution and the alkaline silicate solution are maintained at a temperature in a range from about 40° C. to about 100° C. during mixing;
allowing at least a portion of the selected hydrated metal silicate to precipitate; and
using at least a portion of the selected hydrated metal silicate to form a selected smectite.
51. A method of making a selected smectite, comprising:
obtaining a metal compound solution, the metal compound solution comprising at least two multivalent metals;
obtaining an alkaline solution;
obtaining a silicate solution;
mixing the alkaline solution and the metal compound solution to form an alkaline metal compound solution, and wherein the pH of the alkaline metal compound solution is maintained at greater than about 7.0, controlling the pH during at least a portion of the mixing to form a selected alkaline metal compound solution comprising at least two multivalent metals, and wherein the alkaline metal compound solution and the silicate solution are maintained at a temperature in a range from about 40° C. to about 100° C. during mixing;
mixing the silicate solution with the selected alkaline metal compound solution to form a selected hydrated metal silicate;
allowing at least a portion of the selected hydrated metal silicate to precipitate; and
using at least a portion of the selected hydrated metal silicate to form a selected smectite.
52. The method of claim 1 , wherein the multivalent metals comprise magnesium and aluminum, the alkaline solution comprises carbonate, the silicate solution comprises sodium silicate, and further comprising mixing lithium fluoride to the alkaline solution, metal compound solution, or silicate solution.