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 Technology Profile

Title:

Process for Production of High Purity Magnesia
Value Proposition:

The present invention provides an improved process for the preparation of MgO of high purity >99% from salt bitterns.
Summary Application:

The proposed process involves reaction of MgCl2 rich brine obtained in course of recovering KCl from SEL in the integrated SOP process with liquid ammonia to precipitate magnesium hydroxide and subsequent calcination of the latter to produce high purity magnesia. The aqueous ammonium chloride stream is treated with lime to regenerate & recycle ammonia in magnesium hydroxide precipitated process.
Advantages:
  • Superior refractory properties at high temperature operations
  • Suitable for LD converter for primary steelmaking
  • High purity magnesia is suitable for extraction of Magnesium metal.
  • Effluent to comply with statutory norms.
  • Conservation of fresh water
Commercialization Status: Already Commercialised
Tech. Readiness Level:
CSIR-Central Salt & Marine Chemicals Research Institute
CSIR-Central Salt & Marine Chemicals Research Institute[CSIR-CSMCRI]
:  director[at]csmcri[dot]res[dot]in
:91-278- 2569496 Ext. 6000, 6010
:https://www.csmcri.res.in
Industrial Applications: Chemistry, Chemical Processes Polymers [Chemistry, Chemical Processes] Materials Processes [Materials]
Patent(s): AU2006337405 EP1986957 IN260199 JP5102780 US7811535
Patent Application(s): WO2007088409, BRPI0621297, CN101400606, IL192952, JO345/2008, MX287866
Photograph(s)