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Showing 1 to 20 of 24 for “"MAGNESITE"”.
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The cello player : a sculpture in Magnesite
… technical and working aspects of a new material, Magnesite. Lastly, it will evaluate the use of Magnesite as sculptural material. </p><p>It is hoped that this paper will be of some future use to anyone wishing to do a piece of sculpture by the modeling method, or anyone interested in experimenting …
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A macroscopic and microscopic investigation of the magnesite – otavite solid soluition
The magnesite (MgCO3) – calcite (CaCO3) system is the most geologically important of the carbonate minerals. At intermediate compositions a distinct ordered phase exists, dolomite [MgCa(CO3)2], which has symmetry. A complete, disordered ( c symmetry) solid solution exists, but at temperatures in …
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Geology and Geochemistry of Muyexe Magnesite Deposit, Giyani Greenstone Belt, Limpopo Province, South Africa
Muyexe magnesite deposit is situated in the Giyani Greenstone Belt in South Africa. Despite mining activities currently taking place at Muyexe magnesite deposit, little information is available about the geology and geochemistry of the deposit. This has resulted in a gap of information about the …
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Molecular Dynamics Simulation of Forsterite and Magnesite Mechanical Properties: Effect of Carbonation on Comminution Energy
… of two minerals, forsterite (Mg2SiO4) and magnesite (MgCO3) using molecular dynamics (MD) simulation. The goal is to understand whether carbonation results in hardness reduction of rock and subsequently comminution energy during the crushing and processing of the ore. We investigated how …
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ΜΕΛΕΤΗ ΤΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΤΩΝ ΑΝΘΡΑΚΙΚΩΝ ΟΡΥΚΤΩΝ ΤΟΥ ΜΑΓΝΗΣΙΟΥ ΚΑΤΑ ΤΗΝ ΕΠΙΠΛΕΥΣΗΤΟΥΣ
… BEEN CARRIED OUT ON THE FLOTATION BEHAVIOUR OF MAGNESITE AND DOLOMITE WITH SODIUM OLEATE AS COLLECTOR. THE EFFECT OF THE MODIFIERS: SODIUM PYROPHOSPHATES, SODIUM HEXAMETAPHOSPHATE, SODIUM SILICATE, SODIUM FLUOROSILICATE, CARBOXYMETHYLCELLGLOSE AND CALCON ON THE FLOTATION OF THE MINERALS WAS …
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Removal of cationic and anionic dyes from aqueous solution using a clay-based nanocomposite.
… of dye removal from wastewater by calcined magnesite, halloysite nanoclay and calcined magnesite - halloysite nanoclay composite was evaluated. To this end, the study was subdivided to four segments. The first segment of the study focused on evaluating the efficiency of using calcined …
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Silicate Mineral Dissolution and Associated Carbonate Precipitation at Conditions Relevant to Geologic Carbon Sequestration
… and different initial mineral substrates on magnesite precipitation from water-scCO2 solutions. The critical saturation index necessary for initiating magnesite precipitation at 100 degree C and 100 bar PCO2 was approximately 2. Precipitation was fastest when solutions were seeded with …
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Interplay between mineral reaction and deformation via structural defects
… the mineral reaction between natural calcite and magnesite. The solid-solid mineral reaction between the two carbonates causes the formation of a magnesio-calcite precursor layer and a dolomite reaction rim in every experiment at isostatic annealing and deformation conditions. CHAPTER 1 briefly …
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Development of an acid mine drainage treatment technology and recovery of minerals
… techniques in treatment of AMD with calcined magnesite. Sonication technique was more effective in treatment of AMD because it raised pH faster and it enhanced precipitation of minerals than flocculation. Due to the superiority of sonication, it was used for recovery of metal oxides from AMD …
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Experimental investigation of the fluid driven carbonation of serpentinites and spinel-peridotites: implications for the carbon and trace element cycle in the forearc region of the mantle wedge
… With decreasing CO2 activity in the fluid, magnesite is formed with quartz, talc and antigorite at 1-2.5 GPa and 375-650 °C. Above antigorite stability, magnesite is stable with talc, talc+enstatite and enstatite±forsterite. Excess aluminium derived from the consumed serpentine or pyroxenes …
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Experimental investigation of the fluid driven carbonation of serpentinites and spinel-peridotites: implications for the carbon and trace element cycle in the forearc region of the mantle wedge
… With decreasing CO2 activity in the fluid, magnesite is formed with quartz, talc and antigorite at 1-2.5 GPa and 375-650 °C. Above antigorite stability, magnesite is stable with talc, talc+enstatite and enstatite±forsterite. Excess aluminium derived from the consumed serpentine or pyroxenes …
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The carbon speciation in the Earth’s interior as function of pressure, temperature and oxygen fugacity
… the deeper mantle. The oxygen fugacity at which magnesite and diamond coexist showed a slight decrease with pressure, however, implying the possibility that magnesite may become the stable host for carbon at the very base of the lower mantle. The oxygen fugacity at which mantle xenoliths …
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Optimization of Struvite Recovery Utilizing Magnesium Oxide
… through the Pearl® process. MgO is produced from magnesite (MgCO3) calcination, and different calcination conditions can alter the quality and characteristics of the MgO product. It was hypothesized that the insolubility of MgO could provide a "slowly available" form of Mg2+ in the reactor and …
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The origin and behaviour of carbonate minerals in diverse environments: from subduction zones to asteroids
… aqueous solubility of dolomite [CaMg(CO3)2] and magnesite (MgCO3) was investigated using optical solubility experiments in the DAC. Following the experimental chapters, the role of clays in the formation of an iron oxide-bearing calcite phantom crystal is discussed and the potential of this …
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Investigation into the Production of Carbonates and Oxides from Synthetic Brine through Carbon Sequestration
… is currently produced from the calcination of magnesite (MgCO3), emitting more CO2 than the production of PC, or from seawater/brine which is also extremely energy intensive. Hence this research aims to investigate an innovative method to produce MgO from reject brine, a waste Mg source, …
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Development of a computer-based advisory system for a selection of appropriate rehabilitation strategies for designated abandoned mine sites in Limpopo Province of South Africa
… Tailings, Klein Letaba Gold Mine Tailings, Nyala Magnesite Mine Tailings (A), Nyala Magnesite Mine Tailings (B), Louis Moore Gold Mine Tailings, and Mesina Copper Mine Tailings. The description of the hazards and evaluation of the strategies for dealing with the problems of abandoned surface mine …
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CO2 Sequestration through Mineral Carbonation
… solution. Extensive conversion of the olivine to magnesite and amorphous silica was observed, confirming the viability of the new workflow and functionality of the designed reactor. Montney and Duvernay samples were then tested at 150°C/150bar in synthetic reservoir brine. Both samples underwent …
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Prediction of Mississippi-Valley type ore fluid metal concentrations from solid solution metal concentrations in ore-stage minerals
… of Mg and Mn, which form carbonate minerals (magnesite and rhodochrosite) with the calcite structure, were in good agreement with available fluid inclusion data for these elements. Thus, the predicted ore fluid concentrations of Zn and Fe, which also form carbonate minerals (smithsonite and …
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