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Chemical processing of
dolomite associated with the phosphorites for production of magnesium
sulfate heptahydrate
Egyptian dolomite (CaMg(CO3)2) associated with Abu-Tartur
phosphorites, New Valley was leached with sulfuric acid to produce magnesium
sulfate heptahydrate and calcium sulfate dihydrate (gypsum). Magnesium
sulfate heptahydrate containing 16.23% MgO was obtained at the following
optimum conditions The particle size was100% -150µm, temperature of the
reaction was 60oC, time of reaction 50.0 minute, solid/liquid
ratio 1:4g/ml and mole ratios of sulfuric acid to calcium oxide and
magnesium oxide was 1.0 and pH 8.5 for removal of precipitated iron,
manganese, aluminum. The magnesium sulfate was separated from calcium
sulfate dihydrate by filtration. The factors affecting on the filtration
rate was studied and the filtered magnesium sulfate was concentrated at
density from 1.35-1.45g/ml at temperature 103-110oC and then
crystallized as MgSO4.7H2O by cooling at room
temperature. The purity of the produced magnesium sulfate heptahydrate was
99.2%. |
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