公开(公告)号：CA2930003A1

公开(公告)日：2015-06-11

申请号：CA2930003

申请日：2014-12-02

Applicant: BASF SE

Inventor： ADKINS STEPHEN

IPC: C02F1/56 ,  B01D21/01 ,  C02F1/52

Abstract: The present invention relates to a process of dewatering a suspension comprising particulate solids dispersed in an aqueous liquid, said particulate solids comprises clay and mineral parti- cles of size below 50 µm, which process comprises the steps of, (a) Addition of at least one polymer and of at least one salt solution to the suspension; and (b) Dewatering the polymer treated suspension of step (a).

公开(公告)号：CA2892983A1

公开(公告)日：2014-07-24

申请号：CA2892983

申请日：2014-01-17

Applicant: BASF SE

Inventor： ADKINS STEPHEN

IPC: B03D3/06 ,  B01D21/01

Abstract: The invention relates to process of preparing a stabilized suspension, suitable for dewatering, which suspension comprises particulate solids dispersed in an aqueous liquid, said particulate solids comprises clay and mineral particles of size below 50 µm, which process comprises the steps of, (a) subjecting the suspension to a kinetic energy stage to produce a modified suspension; (b) adding a modified suspension stabilizing chemical, in which the kinetic energy stage is a shearing stage and/or application of ultrasonic energy to the suspension. The process also relates to a so stabilized suspension and a process of dewatering said stabilized suspension by the steps of, (c) addition of a water-soluble polymer intrinsic viscosity of at least 3 dl/g to the stabilized suspension of step (a); (d) dewatering the polymer treated suspension of step (c). The invention is particularly suited to dewatering of mature fine tailings derived from oil sands tailings. The process of the invention preferably involves rigidification of the suspension.

公开(公告)号：CO6960536A2

公开(公告)日：2014-05-30

申请号：CO14105098

申请日：2014-05-15

Applicant: BASF SE

Inventor： BERGER ALEXSANDRO ,  ADKINS STEPHEN ,  HESS STEPHAN

IPC: C02F1/56

公开(公告)号：CA2879481A1

公开(公告)日：2014-02-13

申请号：CA2879481

申请日：2013-08-07

Applicant: BASF SE

Inventor： NISBETT ANDREW ,  ADKINS STEPHEN ,  FLANAGAN IAN JOHN ,  BERGER ALEXSANDRO

IPC: C22B3/20 ,  B01D21/01 ,  C22B15/00

Abstract: The present invention relates to a metal leach and recovery process. The process involves subjecting a metal bearing material to a reactive process by combining said metal bearing material with a leaching agent to liberate at least one metal value and forming a first aqueous leach pulp. This first aqueous leach pulp is subjected to a solid liquid separation step thereby providing a first clarified aqueous leach solution and a second aqueous leach pulp. The first clarified aqueous leach solution is then subjected to solvent extraction thereby obtaining the first aqueous raffinate. The second aqueous leach pulp is subjected to at least two further solid liquid separation steps of which some or all are in a counter current decantation (CCD) arrangement. Each of the solid liquid separation steps of the CCD arrangement results in an aqueous liquor and aqueous suspension of solids wherein each aqueous suspension of solids resulting from each solid liquid separation step of the CCD arrangement is passed to the subsequent solid liquid separation step and the suspension of solids resulting from the final solid liquid separation step is removed from the process. Further, each aqueous liquor resulting from each solid liquid separation step of the CCD arrangement is passed to the previous solid liquid separation step. The further solid liquid separation steps result in at least one further clarified aqueous leach solution. The at least one further clarified aqueous leach solution is/are subjected to solvent extraction thereby obtaining at least one further aqueous raffinate. At least a portion of the one or more of the at least one further aqueous raffinates is fed into the final solid liquid separation is of the CCD arrangement. The process provides a flocculation system comprising either: (i) addition of an organic polymeric flocculant to or prior to at least one solid liquid separation step, which polymeric flocculant is formed from 2-acrylamido-2-methylpropane sulphonic acid (ATBS) or salts thereof as a homopolymer or copolymer with at least one water-soluble ethylenically unsaturated monomer; or (ii) addition of an organic polymeric flocculant and at least one support agent to or prior to at least one solid liquid separation step, which at least one support agent is selected from at least one of the group consisting of oxidising agents, reducing agents, irradiation and free radical producing agents. The process provides significantly improved metal extraction and recovery.

公开(公告)号：CL2012002810A1

公开(公告)日：2012-12-07

申请号：CL2012002810

申请日：2012-10-05

Applicant: BASF SE

Inventor： FLANAGAN IAN JOHN ,  BRODT GREGOR ,  ADKINS STEPHEN ,  STOCKS PAUL

IPC: B01D21/01 ,  B01D21/02

Abstract: Proceso de formación de una segunda suspensión acuosa de partículas sólidas por sedimentación por gravedad de una primera suspensión, que comprende agregar al menos un floculante polimérico orgánico a la primera suspensión para formar una suspensión de sólidos floculados los que se decantan para formar un lecho de sólidos, e introducir un agente para formar la segunda suspensión.

公开(公告)号：CA2793957A1

公开(公告)日：2011-10-13

申请号：CA2793957

申请日：2011-04-08

Applicant: BASF SE

Inventor： STOCKS PAUL ,  FLANAGAN IAN JOHN ,  BRODT GREGOR ,  ADKINS STEPHEN

IPC: B01D21/01

Abstract: A process of forming a second aqueous suspension of solid particles (15) by gravity sedimentation of a first aqueous suspension of solid particles (14) in a vessel (13), comprising the steps of, adding at least one organic polymeric flocculant (12) to the first aqueous suspension of solid particles (14) thereby forming a suspension of flocculated solids (1 1 ), which flocculated solids settle to form a bed of consolidated solids (5), introduction of an effective amount of an agent, into the i) bed of consolidated solids (5) or ii) the flocculated solids that are settling (1 1 ), in order to form the second aqueous suspension (15), in which the second aqueous suspension of solid particles (15) is of higher solids content than the first aqueous suspension of solid particles (14), and in which the agent is selected from the group consisting of free radical agents and oxidising agents, wherein the agent is introduced means selected from the group consisting of A) one or more rakes (10) which convey the agent; B) one or more conduits (16) entering through the top of the vessel through which the agent is introduced C) one or more apertures or conduits (17) in the side walls of the vessel through which the agent is introduced; D) one or more apertures or conduits (18) in the base of the vessel through which the agent is introduced; E) introducing the agent through one or more apertures or conduits (19) in the feed line conveying the bed of consolidated solids from the base of the vessel, preferably between the base of the vessel and a pump; and F) one or more sparges (20) through which the agent is introduced.