Abstract
In our previous report, lithium contained in both sea water and bittern was determined, thereby having confirmed that the lithium contained in sea water was almost concentrated into bittern.
In this study, the content of lithium in the concentrated bittern samples was estimated to be 10.8-12.1mg/l, while the lithium contained in the mother liquor of basic magnesium carbonate manufactured from bittern by sodium carbonate method was estimated to be 1.84mg/l.
The mother liquor of basic magnesium carbonate was evaporated at 75-80°C under the condition of pH6 until the most portion of byproduced salt was precipited. Using the components of the filtrate as reference, artificially concentrated solution was prepared for the purpose of the continuous evaporation.
One of these continuous evaporations was conducted after the removal of magnesium as magnesium hydroxide. As the result, the over-all recovery of lithium from the mother liquor was 68.2%, and lithium content in the last remaining solution (Table 8) amounted to 95mg/l.
