where [C.sub.RE] is the rare earth ion concentration, mL/mg; [C.sub.EDTA] is the titrant standard concentration, mL/mg; B is the burette reading after titration, mL; A is the burette reading before titration, mL; and the denominator of 5 indicates that 5 mL of the rare earth
mother liquor is taken.
(1) Once synthetic cryolite
mother liquor was the only taken acid leaching agent, the leaching efficiency of aluminum was not that high.
Column chromatography of the
mother liquor of the acetone extract (MAD) eluted with petroleum ether-ethyl acetate of varying composition gave six fractions -A, B, C, D, E and F.
Eleven amide hydrogen atoms were protected from exchange after three months of soaking the crystals in deuterated
mother liquor at pH 8.2.
Final steps involve evaporation and crystallization under vacuum, separation of crystal from
mother liquor in very large spin dryers, final drying in a stream of warm air and separation into desired size ranges by sieving.
To digress to that nebulously remembered beginning, I once worked in a plant that used the
mother liquor brine from evaporated seawater after the local salt works had gleaned the sodium chloride crystals.
In addition, sulfur retention ability of Bayer red mud from an alumina plant was improved by fusel salt and waste
mother liquor of sodium ferrocyanide as the main sulfur fixation agent and the calcium based natural mineral materials as servicing additives.
The crystals were separated and the
mother liquor of the above reaction was diluted with the dry ether (50 ml) and it was saturated with dry HCl gas.