engleski

Examination of boron content and properties of magnesium oxide obtained from sea water

The potentiometric method was used to determine the boron content in magnesium oxide obtained from sea water by sub-stoichiometric precipitation (where precipitation of magnesium hydroxide took place with 80 % of the stoichiometric quantity of the dolomite lime) and by over-stoichiometric precipitation (which took place with 120 % of the stoichiometricquantity of the dolomite lime) ; the analyses depend on the method of rinsing the product obtained. The following were examined: the influence of pH of the rinsing solution, duration of stirring and contact of the suspension, influence of the quantity of the rinsing agent, and the method of precipitate separation in sub- stoichiometric precipitation. It has been proved that the use of the appropriate rinsing method in the case of sub-stoichiometric precipitation leads to results almost identical to those obtained for over- stoichiometric precipitation, which is rather important if one bears in mind the advantages of this precipitation method. Individual samples of magnesium oxide obtained from seawater by sub- and over- stoichiometric precipitation were then sintered. This paper lists densities of samples sintered and presents their photomicrographs.

magnesium oxide from sea water ; properties of boron in magnesium oxide ; determination of boron ; potentiometric methods

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