Magnesium Hydroxide Recovery from Magnesia Waste by Calcinations and Hydration Processes
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Eskişehir Osmangazi University
Bursa Technical University
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Eskişehir Osmangazi University, Eskişehir Osmanagzi University Mining Engineering Department, Meselik-26480, 26480 Eskişehir, Turkey
Publish date: 2015-01-01
Physicochem. Probl. Miner. Process. 2015;51(1):233–245
In this study, hydration behavior of the magnesia waste, supplied from the electrostatic bag house of the sintered unit of MAŞ Company, Eskisehir-Turkey was studied to find out re-usability of the material as a source of the magnesium hydroxide (Mg(OH)2) production. According to chemical and crystalline phase analyses, MgO content of the sample was determined as 49.9 wt% and consists of mainly raw magnesite (MgCO3), sintered magnesia-periclase (MgO), and small amount of serpentine (lizardite) phases. In hydration process, the reactivity of magnesium oxide determines the rate and extent of hydration of the sample. Therefore, the waste samples both calcined and un-calcined forms were hydrated in water and the efficiencies were compared according to sample source. The hydration experiments were carried out at temperatures ranging between 30°C and 80°C to evaluate the influence of the temperature on the particle morphology and the surface areas of the products. The efficiency of the hydration was evaluated by using TG data and SEM analyzed. The test results suggested that the magnesia waste could be use as a source material to production of magnesium hydroxide