Mill discharge grate having dynamic variable sieve openings
AssigneeFLSmidth A/S
InventorMauricio Salinas Hudson
Life of this patent
Estimating the term…
Abstract
A discharge grate (200) for an internal discharge end (3) of a mill (1) may be characterized in that it has at least one dynamic variable sieve opening (206) defined between two adjacent floating screen bars (202). The floating screen bars (202) may be configured to a least temporarily move with respect to one another and/or with respect to a holding frame (201) receiving the floating screen bars (202). Temporary expansion of the at least one dynamic variable sieve opening (206) may permit undersized media to pass to the discharge chute (8) and reduce or eliminate pegging.
Claims15
A discharge grate (200) for an internal discharge end (3) of a mill (1), the discharge grate (200) comprising open surface area for passing pulverized material (5) from the inside of the mill (1) to a discharge chute (8) and closed area for discouraging passage of grinding media (4) from the mill (1) and maintaining the grinding media (4) and unpulverized material within the mill (1), the discharge grate (200) being CHARACTERISED IN THAT it further comprises at least one dynamic variable sieve opening (206) defined between two adjacent floating screen bars (202), said floating screen bars (202) being configured to a least temporarily move with respect to one another and/or with respect to a holding frame (201) receiving the floating screen bars (202).
The discharge grate (200) according to any one of the preceding claims, wherein holding frame (201) comprises receiving openings (214) for receiving the floating screen bars (202), the receiving openings (214) being sized larger than the floating screening bars (202) and configured for receiving a resilient member (213).
The discharge grate (200) according to any one of the preceding claims, further comprising a lifter (203).
The discharge grate (200) according to any one of the preceding claims, further comprising at least one transverse securing bar (205) extending across the floating screen bars (202).
The discharge grate (200) according to any one of the preceding claims, further comprising a baseplate (207) backing a base (204) portion.
The discharge grate (200) according to any one of the preceding claims, further comprising a recessed support lip (210) on opposing sides of a base (204) portion (204) for supporting a lifter (203).
A method of lining an internal discharge end (3) surface of a mill (1) suitable for comminuting ore, comprising:
- providing the discharge grate (200) described in any one of the preceding claims;
- mounting the discharge grate (200) over a discharge chute (8) of the mill (1);
- securing the discharge grate (200) to a mount (7) provided at the discharge end (3).
A method of comminuting ore comprising:
- providing a mill (1) suitable for comminuting ore and having the discharge grate (200) described in any one of the preceding claims provided to an internal discharge end (3) surface of the mill (1);
- the discharge grate (200) being secured to a mount (7) and extending over a discharge chute (8):
- filling the mill (1) with media (4) and material to be pulverized;
- operating the mill (1) by rotating a portion thereof containing the media (4) and material to be pulverized;
- and
- allowing the at least one dynamic variable sieve opening (206) to expand to allow pulverized material (5) and/or undersized media (4) to pass therethrough.
Dependencies are inferred from the claim text.