Inter-particle impingement fracture of heterogeneous material
A process for comminuting particles of heterogeneous material. The particles of heterogeneous material are fragmented and broken into smaller particle size by breaking them against each other. Heterogeneous material means two or more different solid materials or phases in the same solid. The component materials may have different specific gravity and/or hardness. In the process, a slurry of particles of heterogeneous material is pumped through an agitated mixture of impingement media, wherein the impingement media has a size greater than a size of the particles, wherein adjacent impingement media interact to create impingement zones through which the particles pass and impinge each other to cause the particles to fracture and break into smaller particles. The impingement media may be from 5 to 10 times larger than the particles. The impingement media may be harder than the particles. The heterogeneous material may be coal.
1. A process for comminuting particles of heterogeneous material comprising:
obtaining a quantity of feed particles comprising coal particles, wherein the coal particles comprise heterogeneous material having at least two distinct solid phases comprising a coal-derived carbonaceous matter matrix and a coal-derived mineral matter phase; and
pumping a slurry of the feed particles through an agitated mixture of impingement media, wherein the impingement media has a size from 5 to 10 times larger than a size of the feed particles, wherein adjacent agitated impingement media interact to create impingement zones through which the feed particles pass and impinge each other to cause the feed particles to fracture at an interface between the coal-derived carbonaceous matter matrix and the coal-derived mineral matter phase, to liberate particles of coal-derived mineral matter, and to break the coal-derived carbonaceous matter matrix into smaller particles.
2. The process according to claim 1 , wherein the impingement media is harder than the feed particles.
3. The process according to claim 1 , wherein the impingement media has a size from 2 to 3 mm and wherein the feed particles have a size less than d99 0.3 mm.
4. The process according to claim 1 , wherein the impingement media has a size from 0.5 mm to 1 mm and wherein the feed particles have a size less than d99 0.1 mm.
5. The process according to claim 1 , wherein the smaller particles of coal-derived carbonaceous matter have a size less than 50% the size of the feed particles.
6. The process according to claim 1 , wherein the smaller particles of of coal-derived carbonaceous matter have a size less than 20% the size of the feed particles.
7. The process according to claim 1 , wherein the process requires an energy amount less than 10 kwh/MT of dry feed particles.
8. The process according to claim 1 , wherein the process requires an energy amount less than 3 kwh/MT of dry feed particles.
9. The process according to claim 1 , wherein the process requires an energy amount less than 2 kwh/MT of dry feed particles.
10. The process according to claim 1 , wherein the size of the impingement media has a size diameter distribution ranging from a size of X to 2X, wherein X is the smallest diameter size of the media and 2X is the largest diameter size of the media.
11. A process to reduce a particle size of feed particles, wherein the feed particles comprise coal particles, wherein the coal particles comprise heterogenous material having at least two dissimilar solid phases comprising a coal-derived carbonaceous matter matrix and a coal-derived mineral matter phase, the process comprising:
suspending the feed particles in a moving fluid;
agitating a mixture of impingement media, wherein the impingement media have a size from 5 to 10 times larger than the particle size of the feed particles;
forming impingement zones in spaces between adjacent agitated impingement media, and
pumping the moving fluid through the impingement zones to cause the feed particles to impinge each other and fracture at an interface between the coal-derived carbonaceous matter matrix and the coal-derived mineral matter phase to liberate particles of coal-derived mineral matter from the fractured coal-derived carbonaceous matter matrix.
12. The process according to claim 11 , wherein the impingement media has a size from 2 to 3 mm and wherein the feed particles have a size less than d99 0.3 mm.
13. The process according to claim 11 , wherein the impingement media has a size from 0.5 mm to 1 mm and wherein the feed particles have a size less than d99 0.1 mm.
14. The process according to claim 11 , wherein the fractured coal-derived carbonaceous matter has a size less than 50% the size of the feed particles.
15. The process according to claim 11 , wherein the process requires an energy amount less than 10 kwh/MT of dry feed particles.
16. The process according to claim 11 , wherein the process requires an energy amount less than 3 kwh/MT of dry feed particles.
17. The process according to claim 11 , wherein the process requires an energy amount less than 2 kwh/MT of dry feed particles.