Bench Scale Preparation of Hydrated and an Hydrate Magnesium Sulfate from Iraqi Dolomite/تجارب منضدية لتحضير كبريتات المغنيسيوم المائية و اللامائية من الدولومايت العراقي

Abstract

This study was carried on a bench scale experiments , where dolomite of AL-Khadari area site leached with (H2SO4) to produce magnesium sulfate pregnant solution . The optimum conditions applied in this stage were those gained from the previous laboratory experiment (25 wt % H2SO4 , 60 ˚C , 30 min reaction time and - 106 µm particle size) . The solution was subjected to a purification process with (H2O2) as oxidizing agent for (30 min) . reaction time and dolime or (MgO) suspension solution addition from Fe contaminant was used as precipitating agent to remove ferric oxide . Finely , the purified solution was evaporated and magnesium heptahydrate of (95.57 %) purity and recovery of (65.25 %) was obtained by cold crystallization . The anhydrous form with (92.31 %) purity and recovery of (86.0 %) was subsequently obtained by heat treatment of the heptahydrate at (300 ˚C) for (3 hrs) . Preliminary economic feasibility study were conducted for the suggested production technological route of (1000 ton / year) for heptahydrated magnesium sulfate (MgSO4.7H2O) . The study proposed the equipment required, the estimations of investment and production costs . The study was also indicated the economy of the project that can achieve a yearly profit from (642,886,704) ID to (626,380,660) ID beside on the other economic benefits of the project.