Global Patent Index - EP 1009717 A1

EP 1009717 A1 2000-06-21 - WET MILLING OF Mg(OH) 2? SLURRY

Title (en)

WET MILLING OF Mg(OH) 2? SLURRY

Title (de)

NASSVERMAHLUNG EINER AUFSCHLÄMMUNG VON Mg(OH)2

Title (fr)

BROYAGE HUMIDE D'UNE BOUE DE Mg(OH) 2?

Publication

EP 1009717 A1 (EN)

Application

EP 98943256 A

Priority

  • US 9817212 W
  • US 5609497 P
  • US 7174898 P

Abstract (en)

[origin: WO9908962A1] A method for producing a stabilized magnesium hydroxide slurry involving wet milling a starting magnesium hydroxide slurry. Also disclosed is a stabilized magnesium hydroxide slurry produced by the method and magnesia-based products produced from the wet milled magnesium hydroxide slurry. Washed magnesium hydroxide slurry is either (a) fed directly to a wet mill (1) at a controlled rate for particle size reduction, or (b) introduced to a disk filter (2) to increase percent solids to greater than about 60 %. If the disk filter (2) is used, the discharge is directed to a pug mill (3). Flow is recycled within the pug mill (3) through high-shear mixer (4). The pug mill discharge is collected in purge tank (5). A pump (6) is used to withdraw slurry from surge tank (5) and feed wet mill (1) at a controlled rate which rate dictates residence time in wet mill (1). This rate can be altered to control particles size reduction. The milled slurry is collected in storage tank (7).

IPC 1-7 (main, further and additional classification)

C01F 5/14

IPC 8 full level (invention and additional information)

C01F 5/08 (2006.01); C01F 5/14 (2006.01)

CPC (invention and additional information)

C01F 5/08 (2013.01); C01F 5/14 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2006/10 (2013.01); C01P 2006/22 (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

EPO simple patent family

WO 9908962 A1 19990225; AU 9108798 A 19990308; CA 2300947 A1 19990225; EP 1009717 A1 20000621; EP 1009717 A4 20020619

INPADOC legal status


2003-01-08 [18W] WITHDRAWN

- Date of withdrawal: 20021113

2002-06-19 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20020507

2002-06-19 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-06-19 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7C 01F 5/14 A, 7C 01F 5/08 B, 7C 09K 21/02 B, 7C 09C 1/02 B

2000-06-21 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000313

2000-06-21 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE