Process for the preparation of magnesia (MGO)

Details Process for the preparation of magnesia (MGO) Process for the preparation of magnesia (MGO)

2009-03-09

2010-10-12

Silverman, Stanley (Department: 1793)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

C423S155000, C423S170000, C423S178000, C423S357000, C423S497000, C423S636000

Reexamination Certificate

active

07811535

ABSTRACT:
The present invention provides an improved process for the preparation of MgO of high purity >99% from salt bitterns via intermediate formation of Mg(OH)2obtained from the reaction of MgCl2and lime, albeit indirectly, i.e., MgCl2is first reacted with NH3in aqueous medium and the slurry is then filtered with ease. The resultant NH4Cl-containing filtrate is then treated with any lime, to regenerate NH3while the lime itself gets transformed into CaCl2that is used for desulphatation of bittern so as to recover carnallite and thereafter MgCl2of desired quality required in the present invention. The crude Mg(OH)2is dried and calcined directly to produce pure MgO, taking advantage of the fact that adhering impurities in the Mg(OH)2either volatilize away or get transformed into the desired product, i.e., MgO.

REFERENCES:
patent: 3690844 (1972-09-01), Neitzel et al.
patent: 3852044 (1974-12-01), Neitzel et al.
patent: 4693872 (1987-09-01), Nakaya et al.
patent: 4695445 (1987-09-01), Nakaya et al.
patent: 4698379 (1987-10-01), Nakaya et al.

Affiliated with

Also associated with

Rating

Process for the preparation of magnesia (MGO) does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of magnesia (MGO), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of magnesia (MGO) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4239046