Parametric Study on the Extraction of Magnesium from Serpentinite of a Mixed Dump on a Nickel Laterite Ore Mine for Indirect Carbon Sequestration

Author : Maranan, Mark Kenneth Mendres
Major Adviser : Eusebio, Ramon Christian P.
Committee Members : Gatdula, Kristel M.; Carpio, Rowena B.
Year : 2019
Month : June
Type : Thesis
Degree: BS
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Abstract

A study on the effect of reaction temperature, solvent concentration, and reaction time on the extraction of magnesium from serpentinite was performed using Face-Centered Cube Design, a Response Surface Methodology. Characterization test indicates that the crystal structure of the sample is composed of several minerals, with three main components of goethite, khademite, and lizardite. Goethite is the major source of iron, khademite is the major source of aluminum, and lizardite is the major source of magnesium and aluminum contents of the sample. The mineralogical complexity ratio, R, that was calculated is 0.3765. This implies that the initial concentration of Si in the mixed dump samples are higher than the Mg concentration. Statistical analysis illustrated that solvent concentration and reaction temperature, along with their combination, are significant parameters in the extraction efficiency of Mg. No distinguished trend was detected in varying the reaction time. The highest concentration and highest percent extraction efficiency obtained for Mg was 882.12 mg/L and 68.9156 %, respectively. Run 3 was found to have the highest extraction efficiency for Mg at 100 ^oC, 1 M, and 1 hr. The corresponding highest theoretical amount that was computed for carbon dioxide that can be stored or formed into a magnesium carbonate is 35.2848 mg CO₂ per unit gram of serpentinite.

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