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(11)    Patent No :    AP 2573   
(21)    Application No :    AP/P/2008/004654   
(22)    Filing Date :    01.05.2007   
(24)    Date of Grant &    25.01.2013   
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
GB    0609998.0    19.05.2006

(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW

(73) Applicant(s)

CIBA HOLDING INC., Klybeckstrasse 141, 4057 Basel,


(72) Inventors

BELLWOOD John Gerard, Australia
DYMOND Brian, United Kingdom
(74) Representative
(51)  International  Classification   B09B 3/00 (2006.01)    C02F 11/00 (2006.01)
(54)    Title
Rehabilitation method
(57)    Abstract

A method of rehabilitation of a deposition area to render it suitable for plant growth comprising 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 the 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 the rehabilitation of the disposal area is achieved by adding a dewatering 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

(56)    Documents Cited :    WO 2004/060819 A    WO 01/92167 A1    US 5043077 A


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