EP 1333905 B1 20091118 - METHODS OF ENHANCING FINE PARTICLE DEWATERING
Title (en)
METHODS OF ENHANCING FINE PARTICLE DEWATERING
Title (de)
VERFAHREN ZUR VERBESSERUNG DER ENTWÄSSERUNG FEINER TEILCHEN
Title (fr)
PROCEDE PERMETTANT D'AMELIORER LA DESHYDRATATION DE PARTICULES FINES
Publication
Application
Priority
US 0027082 W 20000928
Abstract (en)
[origin: WO0226350A1] A new method of improving the process of dewatering fine particule materials is disclosed. In this method, an aqueous slurry of fine particles is treated with appropriate hydrophobizing reagents so that the particulate material becomes moderately hydrophobic with its water contact angle considerably below 90 DEG . A low hydrophile-lipophile balance (HLB) number surfactant is then added to the slurry, so that the surfactant molecules adsorb on the moderately hydrophobic surface primarily by hydrophobic attraction and, thereby, increase its contact angle close to or above 90 DEG . By virtue of the greatly enhanced hydrophobicity, the water molecules adhering to the surface are destabilized and removed more readily by a mechanical dewatering process. Any nonionic surfactant with its HLB number below about 15 may be used for the hydrophobicity enhancement. The surfactants may be used in conjunction with appropriate solvents such as light hydrocarbon oils and short-chain alcohols. The moisture reduction can be further improved by using appropriate electrolytes in conjunction with the low HLB surfactants, spraying surface tension lowering reagents onto the filter cake, subjecting the cake to a suitable vibratory means, and by using combinations thereof.
IPC 8 full level
B01D 37/02 (2006.01); B03D 1/008 (2006.01); B03D 1/01 (2006.01); C02F 1/00 (2006.01); C02F 1/52 (2006.01); C02F 11/00 (2006.01)
CPC (source: EP)
B03D 1/006 (2013.01); B03D 1/008 (2013.01); B03D 1/01 (2013.01); B03D 1/016 (2013.01); B03D 2201/02 (2013.01); B03D 2203/08 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0226350 A1 20020404; WO 0226350 A8 20061012; AT E448853 T1 20091215; AU 2000277457 B2 20060831; AU 7745700 A 20020408; DE 60043356 D1 20091231; EP 1333905 A1 20030813; EP 1333905 A4 20051005; EP 1333905 B1 20091118; ES 2335472 T3 20100329; PT 1333905 E 20100127
DOCDB simple family (application)
US 0027082 W 20000928; AT 00967227 T 20000928; AU 2000277457 A 20000928; AU 7745700 A 20000928; DE 60043356 T 20000928; EP 00967227 A 20000928; ES 00967227 T 20000928; PT 00967227 T 20000928