engleski

Activated sintering of magnesium oxide obtained from seawater

The process of isothermal sintering of magnesium oxide obtained from seawater by sub-stoichiometric (where the precipitation of magnesium hydroxide took place with 80% of the stoichiometric quantity of dolomite lime) and by over-stoichiometric precipitation (which took place with 120% of the stoichiometric quantity of dolomite lime) was examined with the addition of a mass fraction of 1%, 2% and 5% TiO2, at temperatures in the range 1550– 1750 °C, with 1 h, 3 h and 5 h of soaking at the maximum temperature. The process was followed by a determination of the product density, as well as of the B2O3 content in the sintered samples. The results indicate that besides favourably affecting the density of the sintered samples, the addition of TiO2, with increasing temperature and soaking time, also significantly reduces the B2O3 content in sintered magnesium oxide obtained from seawater. A statistical analysis of the data obtained has been performed with the "Statistica" package in order to obtain a model of the density (r) of the sintered samples of magnesium oxide relative to the temperature (t) and the time of isothermal heating (s), and the percent of added TiO2 (x).

sub-stoichiometric precipitation; over-stoichiometric precipitation; magnesium oxide from seawater; TiO2 addition; activated sintering

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