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1. (WO2019008217) UNITÉ DE FLOTTATION PAR MOUSSE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. A froth flotation unit (10) for treating mineral ore particles suspended in slurry (1) and for separating the slurry into an underflow (la) and an overflow (lb), the froth flotation unit comprising

a tank (11) with a centre (111) and a perimeter (110),

a gas supply (12) for introducing flotation gas (2) into the slurry to form froth (3), and

a first froth collection launder (21) comprising a first froth overflow lip (121a) facing towards the centre (111) of the tank (11),

wherein the froth flotation unit has a pulp area (A) of at least 15 m2 , measured at a mixing area (140), characterized in that the froth flotation unit further comprises

a second froth collection launder (22) arranged inside the first froth collection launder (21), the second froth collection launder comprising a first froth overflow lip (122a) facing the perimeter (110) of the flotation tank (11), and

a froth blocker (31) arranged between the first froth overflow lip (121a) and the second froth overflow lip (122a) .

2. The froth flotation unit according to claim 1, characterized in that the second froth flotation launder (22) comprises a second overflow lip (122b) facing the centre (111) of the tank (11) .

3. The froth flotation unit according to claim 1 or 2, characterized in that a second froth blocker (32) is arranged inside the second lip (122b) .

4. The froth flotation unit according to any one of claims 1-3, characterized in that the first froth collection launder (21) comprises a second overflow lip (121b) facing the perimeter (110) of the tank (11) .

5. The froth flotation unit according to claim 4, characterized in that the tank further comprises a third froth collection launder (23) comprising a first froth overflow lip (123a) facing the centre of the tank, the launder (23) arranged on the perimeter of the tank, and that the first froth collection launder (21) comprises a second overflow lip (121b) facing the perimeter (110) of the tank (11), and that a third froth blocker (33) is arranged between first froth overflow lip (123a) of the third launder and the second froth overflow lip (121b) of the first froth collection launder (21) .

6. The froth flotation unit according to any one of claims 1-3, characterized in that the first froth collection launder (21) is arranged on a perimeter (110) of the tank (11) .

7. The froth flotation unit according to any one of claims 1-6, characterized in that the pulp area (A) comprises the combined area of open froth surfaces (Ai, A2 , A3) formed between any two froth overflow lips (121a, 121b, 122a, 122b), and/or inside a froth overflow lip (122a) .

8. The froth flotation unit according to claim 7, characteri zed in that an open froth surface ( Ai ) is dividable into two open froth subsurfaces ( Ai a , Alh) by a froth blocker (31), one open froth subsurface ( Al a ) on the side of the first froth overflow lip (121a) and one open froth subsurface ( Alb ) on the side of the second froth overflow lip (122a), so that the two open froth subsurfaces are completely separated by the froth blocker (31); or so that the two open froth subsurfaces are partially separated by the froth blocker and have a fluid connection.

9. The froth flotation unit (10) according to any one of claims 1-8, characteri zed in that the cross-section of the froth blocker (31) in the radial direction of the tank (11) is a functional triangle (300) comprising a first vertex (301) pointing towards a bottom (112) of the tank (11), a second vertex (302), and a third vertex (303) so that a top side (t), drawn from the second vertex (302) to the third vertex (303) and radially in plane with a horizontal drawn through the centre (111) of the tank (11); a first side (a), drawn from the first vertex (301) to the second vertex (302) and facing a froth overflow lip adjacent to the second vertex (302) ; and a second side (b) , drawn from the first vertex (301) to the third vertex (303) and facing the froth overflow lip adjacent to the third vertex (303), are formed .

10. The froth flotation unit according to claim 9, characterized in that froth blocker (31) is arranged to have a form which allows a froth (3) load to be balanced between an open froth subsurface (Aia) on the first side (a) of the functional triangle (300) and an open froth subsurface (Aib) on the second side (b) of the functional triangle (300) .

11. The froth flotation unit according to claims 9 or 10, characterized in that a first angle (a) formed between a vertical line (n) drawn from the first vertex (301) to the top side (t) of the functional triangle (300) and the first side (a) is 0 - 30° .

12. The froth flotation unit according to claim 11, characterized in that a second angle (β) between the vertical line (n) of the functional triangle (300) and the second side (b) is 20 - 45°.

13. The froth flotation unit according to claim 12, characterized in that the functional triangle (300) is a scalene triangle wherein the second angle (β) is at least 5°, preferably at least 10°, larger than the first angle (a) .

14. The froth flotation unit according to any one of claims 8-13, characterized in that the area of an open froth surface (Α ) is arranged to be varied so that the relationship between the two open froth subsurfaces (Ala, Alb) separated by a froth blocker (31) is changed.

15. The froth flotation unit according to claim 14, characteri zed in that the relationship between the two open froth subsurfaces ( Al a , Alb ) separated by a froth blocker (31) is arranged to be varied by changing the vertical position of the froth blocker (31) in relation to the height (H) of a froth overflow lip (121a, 122a) next to the froth blocker (31), and/or by moving the position of the first vertex (301) of the functional triangle (300) in relation to the froth overflow lip (121a, 122a) next to the froth blocker (31) .

16. The froth flotation unit according to claim 14, characteri zed in that the relationship between the two open froth subsurfaces ( Ai a , Alh) separated by a froth blocker (31) is arranged to be varied by moving the froth blocker (31) vertically in relation to the height (H) of the first froth overflow lip (121a) next to the froth blocker (31), and/or by moving the position of the first vertex (301) of the functional triangle (300) in relation to the centre (111) of the tank (11) .

17. The froth flotation unit according to any one of claims 8-13, characteri zed in that the relationship between the two open froth subsurfaces ( Aia , Aib ) separated by a froth blocker (31) is arranged to be varied by moving the froth blocker (31) vertically in relation to the height (H) of the first froth overflow lip (121a) next to the froth blocker (31) .

18. The froth flotation unit according to claim 17, characteri zed in that an open froth surface ( Ai ) is dividable into two open froth subsurfaces ( Al a , Alb ) by a froth blocker (31), one open froth subsurface ( Aia ) on the side of the first froth overflow lip (121a) and one open froth subsurface ( Aib ) on the side of the second froth overflow lip (122a), so that the two open froth subsurfaces are partially separated by the froth blocker and have a fluid connection.

19. The froth flotation unit according to any one of claims 1-17, characteri zed in that the froth blocker (31, 32, 33) is a continuous circle.

20. The froth flotation unit according to any one of claims 1-18, characteri zed in that the froth blocker (31) comprises individual circle arcs (31a, 31b, 31c) and discontinuation points (34a, 34b, 34c) between the arcs so that a fluid connection between the open froth subsurfaces ( Ai a , Alh) is formed .

21. The froth flotation unit according to any one of claims 1-18, characterized in that the froth blocker (31, 32, 33) is a segment of the tank (11) .

22. The froth flotation unit according to claim 21, characteri zed in that the froth blocker (31, 32, 33) is a circle segment (35a, 35b, 35c) of the tank (11) .

23. The froth flotation unit according to claims 21 or 22, characteri zed in that the froth blocker (31, 32, 33) is arranged to be movable along a rotational axis (x) so that the position of the first vertex (301) may be changed in relation to centre (111) of the tank (11) .

24. The froth flotation unit according to claim 23, characterized in that the rotational axis (x) is parallel to a chord (c) of the tank (11) .

25. The froth flotation unit according to any one of claims 1-24, characterized in that the gas supply (12) is arranged into the tank (11) .

26. The froth flotation unit according to any one of claims 1-25, characterized in that the tank comprises a mixing device (14) .

27. The froth flotation unit according to claim 26, characterized in that the mixing device comprises a gas supply (12) .

28. The froth flotation unit according to any one of claims 1-27, characterized in that pulp area (A) is at least 40 m2 , measured at the mixing area (140) .

29. The froth flotation unit according to any one of claims 1-28, characterized in that a distance (d) between a froth overflow lip (121a, 121b, 122a, 122b) and the first side (a) of a froth blocker (31, 32, 33) or the second side (b) of a froth blocker is at most 500 mm, preferably from 100 to 500 mm.

30. A flotation line (50) comprising at least one froth flotation unit (10) according to any one of claims 1-29.

31. The flotation line (50) according to claim 30, characterized in that a froth flotation unit (10) is arranged into a downstream end of the flotation line.

32. The flotation line (50) according to claims 30 or 31, characterized in that it comprises at least two conventional flotation units (51a, 51b) and/or at least two additional froth flotation units (10a, 10b) arranged to treat the slurry (1) before it is arranged to be treated in the froth flotation unit (10) .

33. Use of a froth flotation line (50) according to any one of claims 30-32 in recovering mineral ore particles comprising a desired mineral.

34. Use of the froth flotation line (50) according to claim 33 in recovering mineral ore particles comprising a desired mineral from low grade ore.

35. Use of the froth flotation line (50) according to claim 34 in recovering mineral ore particles comprising Cu from low grade ore.

36. A froth flotation method for treating mineral ore particles suspended in slurry, wherein the slurry is separated into an underflow (la) and an overflow (lb) in a froth flotation unit (10) according to any one of claims 1-29, characterized in that an open froth surface ( Ai ) of a flotation tank (11) is divided into two open froth subsurfaces ( Al a , Alb ) by a froth blocker (31) arranged between a first overflow lip (121a) of a first froth collection launder (21) and a first overflow lip (122a) of a second froth collection launder (22).

37. The froth flotation method according to claim 36, characterized in that the two open froth subsurfaces ( Al a , Alb ) are completely separated by the froth blocker (31) .

38. The froth flotation method according to claim 36, characterized in that the two open froth subsurfaces ( Al a , Alb ) are partially separated by the froth blocker (31) and have a fluid connection.

39. The froth flotation method according to any one of claims 36-38, characterized in that the area of an open froth surface ( Ai ) is varied so that the relationship between the two open froth subsurfaces ( Al a , Alb ) separated by a froth blocker (31, 32, 33) is changed.

40. The froth flotation method according to any one of claims 36-39, characterized in that the relationship between the two open froth subsurfaces ( Aia , Aib ) separated by a froth blocker (31) is varied by changing the vertical position of the froth blocker (31) in relation to the height (H) of a froth overflow lip (121a, 122a) next to the froth blocker (31).

41. The froth flotation method according to any one of claims 36-40, characteri zed in that the relationship between the two open froth subsurfaces (Aia, Alh) separated by a froth blocker (31) is varied by moving the position of the first vertex (301) of the functional triangle (300) in relation to the froth overflow lip (121a, 122a) next to the froth blocker (31) .

42. The froth flotation method according to any one of claims 36-39, characteri zed in that the relationship between the two open froth subsurfaces (Aia, Alh) separated by a froth blocker (31) is varied by moving the froth blocker (31) vertically in relation to the height (H) of the first froth overflow lip (121a) next to the froth blocker.

43. The froth flotation method according to any one of claims 36-41, characteri zed in that the relationship between the two open froth subsurfaces (Aia, Alh) separated by a froth blocker (31) is varied by moving the position of the first vertex (301) of the functional triangle (300) in relation to the centre (111) of the tank (11) .

44. The froth flotation method according to any one of claims 36-43, characteri zed in that the froth blocker (31) is arranged to be movable along a rotational axis (x) so that the position of the first vertex (301) may be changed in relation to centre (111) of the tank (11) .