Systems and methods for removing finely dispersed particulate matter from a fluid stream
Disclosed herein are systems for removing particulate matter from a fluid, comprising a particle functionalized by attachment of at least one activating group or amine functional group, wherein the modified particle complexes with the particulate matter within the fluid to form a removable complex therein. The particulate matter has preferably been contacted, complexed or reacted with a tethering agent. The system is particularly advantageous to removing particulate matter from a fluid waste stream following mining or ore processing operations.
1. A method of removing particulate matter from a waste tailing fluid from a mining process, comprising:
providing an activating material capable of being affixed to the particulate matter, wherein the activating material is an anionic polymer or a cationic polymer;
affixing the activating material to the particulate matter to form activated particles in the waste tailing fluid;
providing anchor particles that are indigenous to a mining process or indigenous to a specific geographic region in which the removal of the particulate matter takes place, and wherein the anchor particles are larger in size than the particulate matter;
providing a tethering material capable of being affixed to the anchor particles, wherein the tethering material is an anionic polymer or a cationic polymer;
attaching the tethering material to the anchor particles to form tether-bearing anchor particles;
adding the tether-bearing anchor particles to the waste tailing fluid comprising the activated particles, wherein the tethering material attaches to the activated particles to form removable complexes in the waste tailing fluid, wherein the removable complexes comprise the particulate matter and the anchor particles; and
removing the removable complexes from the waste tailing fluid, thereby removing the particulate matter therefrom;
wherein, when the activating material is the anionic polymer, the tethering material is the cationic polymer, and when the activating material is the cationic polymer, the tethering material is the anionic polymer.
2. The method of claim 1 , wherein the mining process is coal mining.
3. The method of claim 1 , wherein the mining process is the mining of an inorganic ore.
4. The method of claim 1 , wherein the mining process is beneficiation of an ore.
5. The method of claim 4 , wherein the ore is selected from the group consisting of iron, trona, phosphate, kaolin, bauxite and potash.
6. The method of claim 1 , wherein the particulate matter is selected from the group consisting of coal fines, clay particles and mineral particles.
7. The method of claim 6 , wherein the particulate matter has a mass mean diameter less than about 50 microns.
8. The method of claim 1 , wherein the particulate matter has a mass mean diameter less than about 50 microns.
9. The method of claim 1 , wherein the fluid is selected from the group consisting of red mud fluid stream, gangue, slurry containing fine particulate kaolin, tailings from trona mining and slurry produced by phosphate beneficiation.
10. The method of claim 1 , wherein the removable complexes are removed by a process selected from the group consisting of filtration, centrifugation and gravitational settling.
11. The method of claim 1 , wherein the anchor particles comprise sand.
12. The method of claim 11 , wherein the tailing fluid is a phosphate mining tailing fluid.
13. The method of claim 1 , wherein the tethering material is selected from the group consisting of lupamin, branched polyethyleneimine (BPEI), polydimethyldiallylammonium chloride (PDAC), and polydiallyldimethylammonium chloride (pDADMAC).
14. The method of claim 1 , wherein the particulate matter comprises quartz, clay fines, or a combination thereof.
15. The method of claim 1 , wherein the activating material is a polyanion and the tethering material is a polycation.
16. The method of claim 1 , wherein the activating material is a polycation and the tethering material is a polyanion.
17. The method of claim 1 , wherein the anchor particles are indigenous to the mining process.
18. The method of claim 1 , wherein the anchor particles are indigenous to a specific geographic region in which the removal of the particulate takes place.