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(11)    Patent No :    AP 2649   
(21)    Application No :    AP/P/2008/004652   
(22)    Filing Date :    01.05.2007   
(24)    Date of Grant &    25.04.2013   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
GB    0610000.2    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,
Switzerland
(72) Inventors
LAMPERD John, Australia
KAISER Lloyd, Australia
(74) Representative
HONEY & BLANCKENBERG
(51)    International  Classification   C02F 11/00 (2006.01)    C02F 11/14 (2006.01)
    C09K 3/22 (2006.01)    B09B    3/00    (2006.01)
    C02F 1/56 (2006.01)    C02F 103/10 (2006.01)
    C02F 103/16 (2006.01)           
(54)    Title           
    Suppression of dust           

(57)    Abstract

A method of suppressing dust formation in a participate 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
(56)    Documents Cited :    US 5 215 784 A    WO 01/92167 A1    US 5 181 957 A    WO 2004/060819 A

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