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An apparatus for froth flotation including a flotation vessel including a side wall and a bottom wall that includes a fluid drain, and a mixing eductor inside the vessel disposed to impart net rotational force to contents of the vessel about an axis; and a method of separating a desired constituent

An apparatus for froth flotation including a flotation vessel including a side wall and a bottom wall that includes a fluid drain, and a mixing eductor inside the vessel disposed to impart net rotational force to contents of the vessel about an axis; and a method of separating a desired constituent (e.g., coal) from a mixture of particulate matter, including the steps of conditioning a liquid mixture of particulate matter including a desired constituent with a frothing agent to create a pulp, and injecting the pulp into a vessel to impart net rotational movement of pulp in the vessel, are disclosed.

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What is claimed is: 1. A froth flotation apparatus, comprising a flotation vessel comprising a side wall, a top wall comprising a froth outlet, and a bottom wall comprising a fluid drain; and a mixing eductor comprising a primary fluid inlet and a secondary fluid inlet inside the vessel disposed to

What is claimed is: 1. A froth flotation apparatus, comprising a flotation vessel comprising a side wall, a top wall comprising a froth outlet, and a bottom wall comprising a fluid drain; and a mixing eductor comprising a primary fluid inlet and a secondary fluid inlet inside the vessel disposed to impart net rotational force to contents of the vessel about an axis of the vessel, in use, wherein the primary fluid inlet and the secondary fluid inlet are both disposed inside the vessel. 2. An apparatus according to claim 1, comprising a plurality of mixing eductors. 3. An apparatus according to claim 1, wherein the secondary fluid inlet of the mixing eductor has a fixed area. 4. An apparatus according to claim 1, wherein the vessel has a mean radius and the mixing eductor is disposed within the outer 70% of the mean radius of the vessel. 5. An apparatus according to claim 4, wherein the mixing eductor is disposed within the outer 40% of the mean radius of the vessel. 6. An apparatus according to claim 5, wherein the mixing eductor is disposed adjacent to the side wall. 7. An apparatus according to claim 5, wherein the mixing eductor is integral with the side wall. 8. An apparatus according to claim 1, wherein the mixing eductor is disposed with its outlet flow axis parallel to or tangential to the vessel wall. 9. An apparatus according to claim 1, wherein the mixing eductor is disposed with its outlet flow axis within 45 degrees of horizontal. 10. An apparatus according to claim 9, wherein the mixing eductor is disposed with its outlet flow axis within 15 degrees of horizontal. 11. An apparatus according to claim 10, wherein the mixing eductor is disposed with its outlet flow axis within 5 degrees of horizontal. 12. An apparatus according to claim 1, wherein the vessel has a mean interior height and the mixing eductor is disposed within the uppermost seven eighths of the mean interior height of the vessel. 13. An apparatus according to claim 12, wherein the mixing eductor is disposed within the uppermost one half of the mean interior height of the vessel. 14. An apparatus according to claim 13, wherein the mixing eductor is disposed within the uppermost one third of the mean interior height of the vessel. 15. An apparatus according to claim 1, free of mechanical mixers disposed in the vessel. 16. An apparatus according to claim 1, wherein the froth outlet intersects said axis. 17. An apparatus according to claim 1, wherein the top wall defines a raised top of the vessel. 18. An apparatus according to claim 17, wherein the raised vessel top is tapered. 19. An apparatus according to claim 17, wherein the raised vessel top has a curved profile. 20. An apparatus according to claim 1, wherein the bottom wall defines a depressed bottom of the vessel. 21. An apparatus according to claim 20, wherein the depressed vessel bottom is tapered. 22. An apparatus according to claim 20, wherein the depressed vessel bottom is conical with a mean half-cone angle in a range of 5 degrees to 85 degrees. 23. An apparatus according to claim 22, wherein the mean half-cone angle is in a range of 30 degrees to 75 degrees. 24. An apparatus according to claim 1, further comprising a feed conduit in fluid communication with the primary fluid inlet of the eductor and disposed parallel to the vessel side wall. 25. An apparatus according to claim 1, further comprising a feed conduit in fluid communication with the primary fluid inlet of the eductor and entering the vessel from above or below the eductor. 26. An apparatus according to claim 25, wherein the feed conduit enters the vessel through the vessel bottom wall. 27. An apparatus according to claim 1, further comprising at least one of a gas aspirator and a gas injector in fluid communication with the primary fluid inlet of the eductor. 28. An apparatus according to claim 27, wherein the gas aspirator is an air jet pump. 29. An apparatus according to claim 1, further comprising a static mixer in fluid communication with the primary fluid inlet of the eductor. 30. An apparatus according to claim 29, wherein the static mixer is a nonlinear section of conduit. 31. An apparatus according to claim 29, wherein the static mixer is a conduit comprising an internal constriction. 32. An apparatus according to claim 1, further comprising a deflector disposed within the vessel. 33. An apparatus according to claim 32, wherein the deflector is disposed in or adjacent the fluid drain. 34. An apparatus according to claim 1, wherein the vessel is constructed of plastic. 35. A froth flotation apparatus, comprising a flotation vessel comprising a side wall and a bottom wall comprising a fluid drain; and a plurality of mixing eductors each comprising a primary fluid inlet and a secondary fluid inlet inside the vessel disposed to impart net rotational force to contents of the vessel about an axis of the vessel, in use, wherein the primary fluid inlet and the secondary fluid inlet of each eductor are both disposed inside the vessel; and at least one of a gas aspirator and a gas injector in fluid communication with the primary fluid inlet of the eductor. 36. An apparatus according to claim 35, wherein the vessel has a mean radius and the mixing eductor is disposed within the outer 40% of the mean radius of the vessel. 37. An apparatus according to claim 36, wherein the mixing eductor is disposed adjacent to the side wall. 38. An apparatus according to claim 36, wherein the mixing eductor is integral with the side wall. 39. An apparatus according to claim 35, wherein the mixing eductor is disposed with its outlet flow axis parallel to or tangential to the vessel wall. 40. An apparatus according to claim 35, further comprising a vessel top wall, the top wall comprising a froth outlet. 41. An apparatus according to claim 40, wherein the froth outlet intersects said axis. 42. An apparatus according to claim 40, wherein the top wall defines a raised top of the vessel. 43. An apparatus according to claim 42, wherein the raised vessel top is tapered. 44. An apparatus according to claim 42, wherein the raised vessel top has a curved profile. 45. An apparatus according to claim 35, free of mechanical mixers disposed in the vessel.