Patent ID: 11865548
Assignee: OREKINETICS INVESTMENTS PTY LTD
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 18:
19. A spiral separator for separating more-desired material from less-desired material, the spiral separator comprising:
a feed arrangement for feeding a slurry of mixed more-desired material and less-desired material;
a spiral trough; and
a splitting arrangement for off-take of a concentrate band of more desired material;
wherein the spiral trough is configured to provide a trough floor region with an effective cross-trough floor slope which reduces by between 5 and 8 degrees in a turn immediately upstream of the splitting arrangement; and
wherein the trough provides an effective cross-trough floor slope which reduces between a more upstream region of the trough and a more downstream region of the trough, and wherein the reduction in effective cross-trough floor slope in a turn at the downstream region of the spiral trough is provided by the pitch of a more radially outer region of the spiral trough and the pitch of a more radially inner region of the trough being different over said turn of the spiral trough, and wherein the difference in pitch over said turn is between 0.08 and 0.18 times the radial distance between said more radially outer region and said more radially inner region.