Global Patent Index - EP 1028916 A1

EP 1028916 A1 2000-08-23 - METHOD FOR MAKING CALCIUM CARBONATE

Title (en)

METHOD FOR MAKING CALCIUM CARBONATE

Title (de)

VERFAHREN ZUR HERSTELLUNG VON CALCIUMKARBONAT

Title (fr)

PROCEDE DE FABRICATION DE CARBONATE DE CALCIUM

Publication

EP 1028916 A1 (FR)

Application

EP 98952452 A

Priority

  • BE 9800171 W
  • BE 9700894 A

Abstract (en)

[origin: WO9924361A1] The invention concerns a method for making calcium carbonate and/or calcium and magnesium carbonate particles, which consists in treating a basic pH aqueous medium containing Ca(OH)2 and/or Ca(OH)2-Mg(OH)2 by injecting therein gaseous CO2 to form calcium carbonate and/or calcium and magnesium carbonate, and recuperating the formed carbonate particles. The invention is characterised in that the treatment of the aqueous medium is carried out in the presence of at least an additive selected among the group consisting of hydrazine, hydroxylamine, hydroxylamine soluble salts, and their mixtures.

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

C01F 11/18

IPC 8 full level (invention and additional information)

C01F 5/24 (2006.01); C01F 11/18 (2006.01)

CPC (invention and additional information)

C01F 11/182 (2013.01); C01F 5/24 (2013.01); C01P 2004/61 (2013.01); C01P 2006/60 (2013.01); C01P 2006/80 (2013.01)

Citation (search report)

See references of WO 9924361A1

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

EPO simple patent family

WO 9924361 A1 19990520; AR 017571 A1 20010912; AU 1015099 A 19990531; BE 1011538 A4 19991005; BR 9813975 A 20000926; EP 1028916 A1 20000823; PL 340094 A1 20010115; SK 6292000 A3 20001211; ZA 9810169 B 19990507

INPADOC legal status


2002-04-17 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20011017

2001-07-18 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010601

2000-09-06 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

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

2000-08-23 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000531

2000-08-23 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

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