engleski

RINSING THE MAGNESIUM HYDROXIDE PRECIPITATE OBTAINED FROM SEAWATER

This study has examined the combined method of rinsing the magnesium hydroxide precipitate obtained from seawater by substoichiometric (80 %) precipitation. In the first phases of rinsing in the decanting process, distilled water with pH of 4.81 was used, followed by alkalised distilled water with pH of 12.50. During multiple rinses on filter paper, alkalised distilled water was applied and then fresh distilled water (1, 2 and/or 3 times). The purpose of the study is to determine the efficiency of the described method of rinsing of the magnesium hydroxide precipitate obtained from seawater with respect to the reduction of mass fraction of boron (III) oxide, as well as calcium oxide, in calcined magnesium oxide. The experimental results indicate that the CaO content in samples examined becomes more significantly reduced only after rinsing on filter paper. The experimental results also indicate that the sequence of rinsing on filter paper should start with the alkalised distilled water with increased pH value in order to attain a significant B2O3 reduction in calcined magnesium oxide.

substoichiometric precipitation ; rinsing method ; magnesium oxide from seawater ; B2O3 content.

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