Granted Patent B2

US 7,296,687 · App. 11/032,293 · Granted Nov 20, 2007

Abstract

Claims (45)

1. A method of separating feed material including magnetic particles and non-magnetic particles using a magnetic roll separator having an idler roll and a driven magnetic roll carrying magnets about its circumference and a belt in contact with the rolls, comprising the steps of:

A) moving the belt in contact with and over the magnetic and idler rolls all moving in the same direction;

B) directing the feed material onto the belt after contact of the belt with the magnetic roll; and

C) selectively directing the feed towards the surface of the belt at a plurality of spaced positions.

2. The method of claim 1 wherein step B includes the step of:

D) directing the feed into a stream at an angle of the feed stream substantially perpendicular to the surface of the belt and magnetic roll.

3. The method of claim 1 wherein step B includes the step of:

D) directing the feed at an acute angle with respect to the surface of the belt and the magnetic roll.

4. The method of claim 1 wherein step B includes the step of:

D) directing the feed with respect to the surface of such belt at a selectable angle.

5. The method of claim 1 wherein step B includes the steps of:

D) providing the feed materials with predetermined kinetic energy to cause the non-magnetic particles to bounce away from the belt; and

E) kinetically dispersing the magnetic particles to allow the magnetic particles to be attracted and to adhere to magnetic poles provided by the magnetic roll.

6. The method of claim 1 wherein step B includes the step of:

D) selecting the angle of direction of feed onto the belt to be between an angle perpendicular to the surface of the belt and an acute angle with respect to the surface of the belt.

7. The method of claim 1 further including the step of:

D) providing an ionizer adjacent an idler roll for neutralizing an electric charge on the belt.

8. A method of separation feed material including magnetic particles and non-magnetic particles using a magnetic roll separator having an idler roll and a driven magnetic roll carrying magnets about its circumference and a belt in contact with the rolls. comprising the steps of:

A) moving the belt in contact with and over the magnetic and idler rolls all moving in the same direction;

B) directing the feed material onto the belt after contact of the belt with the magnetic roll; and

C) providing the feed materials in step B with predetermined kinetic energy to cause the non-magnetic particles to bounce away from the belt.

9. The method of claim 8 wherein step B includes the step of:

D) providing the feed material with sufficient kinetic energy to disperse the magnetic particles to allow the magnetic particles to adhere to magnetic poles for enhancing the separation of particles making up the feed material.

10. A method of separating feed material including magnetic particles and non-magnetic particles using a magnetic roll separator having an idler roll and a driven magnetic roll carrying magnets about its circumference and a belt in contact with the rolls, comprising the steps of:

A) moving the belt in contact with and over the magnetic and idler rolls all moving in the same direction;

B) directing the feed material onto the belt after contact of the belt with the magnetic roll; and

C) kinetically dispersing the magnetic particles in step B to allow the magnetic particles to be attracted and adhere to magnetic poles provided by the magnetic roll.

11. A method of separating feed material including magnetic particles and non-magnetic particles using a magnetic roll separator having an idler roll spaced from a magnetic roll carrying magnets about its circumference and a continuous belt in contact with the rolls comprising the steps of:

A) moving the belt over the magnetic roll with the belt and roll moving in the same direction;

B) directing the feed onto the belt after contact between the belt and the magnetic roll at an angle of attack with respect to an outer surface of such belt; and

C) directing the feed material onto the belt to provide the feed material with sufficient kinetic energy to cause the non-magnetic particles to bounce on impact away from the belt and to disperse the magnetic particles to allow the magnetic particles to be attracted to and adhere to magnetic poles provided by the magnetic roll for enhancing the separation between the magnetic and non-magnetic particles.

12. The method of claim 11 wherein step B includes the step of:

D) directing the feed onto the magnetic roll whereby the angle of the feed is perpendicular to the surface of the belt and magnetic roll.

13. The method of claim 12 wherein step D includes the step of:

D) selecting the angle at which the feed is directed with respect to the surface of the belt.

14. The method of claim 12 wherein step D includes the step of:

D) selecting the angle at which the feed is directed with respect to the surface of the belt.

15. The method of claim 11 wherein step B includes the step of:

D) directing the feed onto the magnetic roll at an acute angle with respect to the surface of the belt and the magnetic roll.

16. The method of claim 15 wherein step D includes the step of:

D) selectively directing the feed onto the belt at a plurality of positions where an inner surface of the belt is in contact with the magnetic roll.

17. The method of claim 11 wherein step B includes the step of:

D) selectively directing the feed towards the magnetic roll onto an outer surface of the belt at a plurality of spaced positions.

18. The method of claim 11 wherein step B includes the step of:

D) selecting the angle of feed onto the belt to be between an angle perpendicular to such belt surface and an acute angle with respect to the surface of the belt.

Assignments (8)