SPATIAL SPLITTING - BASED OPTICAL MEMS INTERFEROMETERS

Abstract:

A process for preparing alumina comprising leaching an aluminum-containing material with HCl and separating the solid from the leachate to obtain a leachate and solid containing aluminum ions, magnesium ions; MgCl2 Substantially selectively precipitating from the leachate and removing the MgCl2 from the leachate; to obtain a precipitate containing aluminum ions in the form of liquid and AlCl3, the leachate is reacted with HCl and the precipitate Separating the product from the liquid; heating the precipitate under conditions effective to convert AlCl 3 to Al 203; and heating MgCl 2 under conditions effective to convert to MgO; and Recovering gaseous HCl thus produced from heating by heating.