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1. WO2007088407 - AN IMPROVED PROCESS FOR PREPARATION OF MAGNESIUM OXIDE

Publication Number WO/2007/088407
Publication Date 09.08.2007
International Application No. PCT/IB2006/000627
International Filing Date 22.03.2006
Chapter 2 Demand Filed 30.08.2007
IPC
C01F 5/08 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE EARTH METALS
5Compounds of magnesium
02Magnesia
06by thermal decomposition of magnesium compounds
08by calcining magnesium hydroxide
CPC
C01F 5/08
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
5Compounds of magnesium
02Magnesia
06by thermal decomposition of magnesium compounds
08by calcining magnesium hydroxide
Y02P 20/133
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
20Technologies relating to chemical industry
10Process efficiency
133Renewable energy sources, e.g. sunlight
Applicants
  • COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH [IN]/[IN] (AllExceptUS)
  • GHOSH, Pushpito, Kumar [IN]/[IN] (UsOnly)
  • JOSHI, Himanshu, Labhshanker [IN]/[IN] (UsOnly)
  • DERAIYA, Hasina, Hajibhai [IN]/[IN] (UsOnly)
  • GANDHI, Maheshkumar, Ramniklal [IN]/[IN] (UsOnly)
  • DAVE, Rohit, Harshadrai [IN]/[IN] (UsOnly)
  • LANGALIA, Kaushik, Jethalal [IN]/[IN] (UsOnly)
  • MOHANDAS, Vadakke, Puthoor [IN]/[IN] (UsOnly)
Inventors
  • GHOSH, Pushpito, Kumar
  • JOSHI, Himanshu, Labhshanker
  • DERAIYA, Hasina, Hajibhai
  • GANDHI, Maheshkumar, Ramniklal
  • DAVE, Rohit, Harshadrai
  • LANGALIA, Kaushik, Jethalal
  • MOHANDAS, Vadakke, Puthoor
Agents
  • HARIHARAN, Rajeshwari
Priority Data
2622/DEL/200631.01.2006IN
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AN IMPROVED PROCESS FOR PREPARATION OF MAGNESIUM OXIDE
(FR) PROCÉDÉ AMÉLIORÉ DE PRÉPARATION D'OXYDE DE MAGNÉSIUM
Abstract
(EN)
The present invention provides an improved process for the preparation of MgO from the reaction of magnesium salt and alkali/lime . The crude Mg(OH)2 is directly calcined and then treated with water to disintegrate the mass spontaneously to yield a slurry and dissolve away the soluble salts. This slurry is much easier to filter and wash than the original Mg(OH)2 slurry, which helps to speed up the purification operation and also conserve fresh water. Another important advantage of the present method is that even pasty or dough like reaction products that are processed using dough mixers and similar equipment can be worked up with ease. There is no compromise in the quality of MgO achieved in this manner.
(FR)
L'invention concerne un procédé amélioré de préparation de MgO à partir de la réaction d'un sel de magnésium et de l'alcali-calcaire. Le Mg(OH)2 brut est directement calciné, puis traité avec l'eau de manière à désintégrer la masse spontanément pour obtenir une boue et évacuer par dissolution les sels solubles. Cette boue est beaucoup plus facile à filtrer et à laver que la boue d'origine Mg(OH)2, ce qui contribue à accélérer l'opération d'épuration, mais aussi à ménager l'eau douce. Ce procédé présente un autre avantage important, à savoir que même les produits de réaction de type pâteux traités au moyen de malaxeurs ou d'équipements analogues peuvent être travaillés avec facilité. Ainsi, la qualité du MgO obtenu n'est en aucune manière affectée.
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