Suppression for Dust
A method of suppressing dust formation in a particulate mineral material, which particulate mineral material has been dewatered from a suspension of said material, comprising the steps of transferring the suspension of particulate mineral material as a fluid to a deposition area, and in which the suspension is allowed to stand and dewater at the deposition area to form a dewatered particulate mineral material, wherein suppression dust formation of the material is achieved by adding a dust suppressing amount of a polymer to the suspension of the particulate mineral material while it is being transferred as a fluid to the deposition area, wherein the polymer is either a synthetic water-soluble polymer formed from one or more ethylenically unsaturated monomers having an intrinsic viscosity of at least 4 dl/g or a water-soluble polymer that is a natural polymer or semi natural polymer.
1 . (canceled)
2 . The method according to claim 16 in which the polymer is a nonionic or anionic polymer of one or more ethylenically unsaturated monomers.
3 . The method according to claim 16 in which the polymer is a homopolymer of acrylamide or a copolymer of acrylamide with sodium acrylate.
4 . The method according to claim 16 in which the suspension of particulate mineral material is a waste material from a mineral processing operation.
5 . The method according to claim 16 in which the suspension of particulate mineral material is transferred along a conduit and through an outlet to the deposition area.
6 . The method according to claim 16 in which the suspension of particulate mineral material that has been transferred to the deposition area rigidifies upon standing.
7 . The method according to claim 6 in which the suspension of particulate mineral material upon reaching the deposition area flows over the surface of previously rigidified mineral material, wherein the material is allowed to stand and rigidify to form a stack.
8 . The method according to claim 16 in which the suspension of particulate mineral material is transferred by pumping it through a conduit and the polymer is added subsequently to the pumping stage.
9 . The method according to claim 16 in which the suspension of particulate mineral material is transferred by pumping it through a conduit and polymer is added during or prior to the pumping stage.
10 . The method according to claim 16 in which the suspension of particulate mineral material is transferred through a conduit having an outlet wherein the polymer is added to the suspension as it exits the outlet.
11 . The method according to claim 16 in which the suspension of particulate mineral material is transferred through a conduit having an outlet wherein the polymer is added to the suspension before it exits the outlet.
12 . The method according to claim 16 in which the polymer is added in the form of an aqueous solution.
13 . The method according to claim 16 in which the polymer is added in the form of particles.
14 . The method according to claim 16 in which the mineral material is derived from mineral processing operations and is selected from the group consisting of red mud from a Bayer alumina process, tailings from the extraction of base metals, tailings from the extraction of precious metals, tailings from the extraction of iron, tailings from the extraction of nickel, coal tailings, mineral and oil sands and coal fines.
15 . The method according to claim 16 in which the mineral material is hydrophilic in nature.
16 . A method of suppressing dust formation in a particulate mineral material, which particulate mineral material has been dewatered from a suspension of said material, comprising the steps of transferring the suspension of particulate mineral material as a fluid to a deposition area, and in which the suspension is allowed to stand and dewater at the deposition area to form a dewatered particulate mineral material,
wherein suppression dust formation of the material is achieved by adding a dust suppressing amount of a polymer to the suspension of the particulate mineral material while it is being transferred as a fluid to the deposition area,
wherein the polymer is either a synthetic water-soluble polymer formed from one or more ethylenically unsaturated monomers having an intrinsic viscosity of at least 4 dl/g or a water-soluble polymer that is a natural polymer or semi natural polymer.
17 . (canceled)