DefinePK

Abstract

The present study illustrates the details for precipitation of magnesium from Bittern as magnesium oxalate. The target of study is to prepare magnesium oxalate as a precursor for high purity MgO production. Bittern solution is considered as a byproduct in saline, but it is an ore reserve for many useful elements commercially produced at present based on dolomite, sea water. Its rich composition in various elements; especially magnesium salts gives bittern increasing economical concern for different industrial applications. In the present study, the mechanism of magnesium oxalate precipitation from bittern was investigated using oxalic acid. The global reaction kinetics of magnesium oxalate precipitation from seawater was determined using different molar ratios and varied pH (1-6). The effect of temperature on system kinetics was examined at temperatures between 15 to 80°C. The effect of molar ratio on reaction conversion was investigated from 1:1 to 1:1.8 (magnesium to oxalic acid). The optimized parameters were found to be feasible to produce pure magnesium oxalate with 99% conversion at stoichiometric molar ratio at room temperature with pH=4. The effect of different calcinations temperature was studied from 450°C to 1100°C. All necessary instrumentation and chemical analysis needed for final products characterization have been executed including, XRD, XRF, , and SEM analysis.