EP 0764136 A1 19970326 - METHOD FOR PURIFYING IMPURE ALUMINIUM OXIDE BY THERMAL TREATMENT
Title (en)
METHOD FOR PURIFYING IMPURE ALUMINIUM OXIDE BY THERMAL TREATMENT
Title (de)
VERFAHREN ZUR REINIGUNG VON VERUNREINIGTEM ALUMINIUMOXID DURCH THERMISCHE BEHANDLUNG
Title (fr)
PROCEDE DE PURIFICATION D'OXYDE D'ALUMINIUM PAR TRAITEMENT THERMIQUE
Publication
Application
Priority
- FI 9500273 W 19950519
- FI 942339 A 19940520
Abstract (en)
[origin: WO9532153A1] The invention relates to a method for preparing impure aluminium oxide. In accordance with the invention, impure, granular or ground aluminium oxide is subjected to thermal treatment at a temperature of 500-900 DEG C. The thermally-treated aluminium oxide is dissolved in concentrated acid at a raised temperature, is diluted with water, and when necessary, is filtered and centrifugated in order to remove undissolved components. Aluminium salts purified with the method of the invention are suitable to be used as water purifying and retention agents.
IPC 1-7
IPC 8 full level
C01F 7/56 (2022.01); B01J 20/34 (2006.01); C01B 15/023 (2006.01); C01F 7/46 (2006.01); C01F 7/74 (2022.01)
CPC (source: EP US)
C01B 15/023 (2013.01 - EP); C01F 7/56 (2013.01 - EP US); C01F 7/74 (2013.01 - EP)
Citation (search report)
See references of WO 9532153A1
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
WO 9532153 A1 19951130; EP 0764136 A1 19970326; FI 942339 A0 19940520; FI 942339 A 19951121; FI 98509 B 19970327; FI 98509 C 19970710; JP H10500389 A 19980113
DOCDB simple family (application)
FI 9500273 W 19950519; EP 95918630 A 19950519; FI 942339 A 19940520; JP 53007695 A 19950519