Preparation and Properties of Geopolymer Matrix …
Several geopolymer-based materials were produced and characterized by mixing metakaolin, a commercial sodium silicate solution, a sodium hydroxide solution, and a loose waste olivine sand deriving from a metallurgical process devoted to the production of a high manganese steel. Olivine sand was added either in the as-received form or …
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Identical activation volumes of dislocation mobility in the …
4 Discussion 4.1 Diffusion-Controlled Dislocation Motion in Recovery Process. The a and c dislocations have comparable magnitudes of the annihilation rate constants and also the identical activation volumes.Wang et al.[] also demonstrated that they have identical activation energies (400 ± 20 and 400 ± 30 kJ/mol, …
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Activation of [100] (001) slip system by water incorporation in olivine
Previous experimental studies showed that the Etype LPO of olivine, i.e., the activation of the (001)[100] slip system, was obtained under conditions of moderate water content [3,11, 20, 73]. The ...
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What is green sand casting, what does the process entail, …
The process of green sand casting or molding involves using a mixture of mined Olivine sand, Bentonite clay, and water, which is tightly packed into a flask or molding box that creates a "frame" to hold the sand against the pattern. The sand mixture is damp, not baked, fired, or chemically bonded, which makes it malleable and easy to mold.
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Activating natural bentonite as a cost-effective
The bentonite is a widely available and abundant natural mineral, and can be a low cost adsorbent for water and wastewater treatment. This study reported here was directed towards identifying a cost-effective activation protocol for enhancing the adsorption capacity of Australian bentonite for removal of toxic contaminants in …
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Clay Minerals and Ceramics | SpringerLink
The differentiation among clay, silt, and sand is by particle size, but unfortunately, there is no agreement on where the size boundaries should be drawn. In most widely accepted granulometry scales used by agronomists, engineers, and geologists, clay is smaller than either 0.002 or 0.004 (Wentworth Scale) mm in diameter (2–4 μm), …
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Can These Rocks Help Rein in Climate Change?
Rain absorbs carbon dioxide (CO 2) from the atmosphere and forms bicarbonate ions when it reacts with rocks rich in silicate and magnesium, like olivine. The bicarbonate flows into the ocean ...
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Olivine—The Potential Industrial Mineral: An Overview
Abstract. The term, 'Olivine' is generally used to describe a group of minerals that form a solid solution series with fayalite and forsterite as the end members. It is a green or brownish ...
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Mechanical activation of olivine
N-7491 Trondheim, Norway. Received 15 July 2005; accepted 14 August 2005 Available online 13 October 2005. Abstract. This paper investigates how mechanical activation of olivine can increase the mineral s surface reactivity, and illustrates how such technology can give rise to new or improved olivine products.
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Olivine – Geology is the Way
Orthorombic. (Mg, Fe)2[SiO4] Olivine is a ferromagnesian nesosilicate that occurs in mafic and ultramafic rocks in the Earth's crust. It is the most abundant mineral in the Earth's mantle, constituting more than 50% of the upper mantle. The name 'olivine' indicates its distinctive olive/bottle green to yellowish color and was coined in ...
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Replacement reactions for carbon geosequestration may be …
I have obtained the activation energies for the dissolution of Mg-olivine and Ca-olivine in acid-like condition (CN(O s-H) = 0.33) that is relevant to CO 2 mineralization geosequestration to be E ...
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Effect of hydrothermal path on swelling pressure and …
As a buffer material in a high-level radioactive nuclear waste repository, bentonite is subjected to the decay heat released by nuclear waste and the infiltration of groundwater from the surrounding rock. The sequential effects of temperature and water saturation are still unknown. The functional barrier effectiveness of the buffer layer is partly dependent …
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Minerals
Cement, sand and gravel mixtures. Density Converter Online density converter with commonly used units. Dirt and Mud - Densities Densities - pound per cubic foot and kilograms per cubic metre - of dirt and mud. Ditch Filling Materials - Densities Weight or density of ditch filling materials. Geological Time Geological periods and time scale.
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US5333673A
Molten metal is cast into a mold cavity formed of sand held in a predetermined mold configuration by a binder comprising a plurality of sodium bentonite clays. A blend of two or more sodium bentonite clays obtained from different areas as a foundry sand binder synergistically and unexpectedly improves the foundry sand used as a mold cavity for …
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Structural Property Improvements of Bentonite with Sulfuric …
Mineral acids such as sulfuric acid and HCl are used for the activation of bentonite (BALCI, 2016). H + ion is substituted with Al 3+ and other cations of octahedral and tetrahedral sheets of ...
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New measurements of activation volume in olivine …
the upper mantle. Measurement of the pressure dependence of the viscosity of olivine has been a goal of experimentalists almost since the earliest test of olivine-bearing rock under pressure nearly a half-century ago (Griggs et al., 1960). Activation volume, V*, measures the response of high-temperature deformation of a
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A systematic and comprehensive study of Eco-friendly bentonite …
Vijayakumar et al. (2009) evaluated acid-activated bentonite as a catalyst in the esterification reaction of the different carboxylic acid with alcohols or p-cresol. Acid activation of bentonite was carried out in concentrated H 2 SO 4 and characterized by FTIR, XRD, SEM, TGA, acid titration and BET surface area. Esterification was carried …
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Effect of the Acidic and Alkaline Activation of Bentonite
Abstract A study is performed of the effect the means of activation of bentonite-like clays (acidic, alkaline, combined) have on the adsorption characteristics of Fe3+ ions under static conditions. The mechanism of the acidic and alkaline activation of montmorillonite is identified and found to depend on the concentration of the activating …
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CHOICE OF SUITABLE ADDITIVES AND DESIGN OF …
the parameters used for activation differ significantly between the different units and the changes that the activation process brings to the bed material remain unclear. Some of the published results state that (Fe(III)) which is a naturally occurring compound in olivine has the main role for the activation of the material and the decrease of ...
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Improving the engineering properties of a soft marine clay …
Abstract The possibility of improving the engineering properties of a marine clay by adding forsteritic olivine is explored. Strength improvement was recorded with ascending values of olivine contents and curing time. An olivine content of 30% was identified as the optimum value to achieve the targeted improvement for all curing …
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Technology Would Alter Foundries' Sand …
In general, green sand consists of 75-85% sand (silica, chromite, zircon, olivine, or graphite), 5-11% bentonite (clay), 2-4% water, 3-5% other inert material, and 0-1% carbon (e.g., anthracite, or …
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The effect of oxalic acid activation on the bleaching …
Optimum bleaching properties could be achieved using a variety of combinations of acid to bentonite ratios and activation times. Bleaching efficiency tests indicated that 24 h activation at 100°C with 1m oxalic acid and 25% pulp density (w/v) gave results equivalent to that of a commercial bleaching earth (Tonsil Optimum 210 FF).
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Swelling and cation exchange capacity relationship for
The relationship between CEC and SWE for the samples obtained from the heat treatment and H 2 SO 4 activation of the same bentonite. 4. ... Experimental study of swelling characteristic of sand–bentonite mixture for nuclear waste disposal. Soil Founds, 39 (1999), pp. 83-97. View PDF View article CrossRef View in Scopus Google Scholar. …
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Activation of Jordanian Bentonite by Hydrochloric Acid and …
e puried bentonite was prepar ed for acid activation: g ± . g of the puri ed sample was weighed into a ask a n d m Lo f . MH C lw a sa d d e d . er e s u l t i n gs u s p e n s i o n
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Production of an upgraded lignin-derived bio-oil using the …
The pyrolysis step was carried out in a conical spouted bed reactor at 500 °C, whereas the inert sand or the cracking catalysts (γ-Al2O3, spent FCC and olivine) were placed in a fixed bed ...
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Teton-Black Olivine Fine-Mesh Water-Bonded Foundry Casting Sand …
Contains Premium 120 Mesh Olivine (Magnesium Iron Silciate) Raw Sand and Bentonite Blend ; Professionally Formulated, Pre-Mulled, and Quality Inspected ( ready to use) ... TETON BLACK 120 uses premium olivine sand which has greater high temperature stability, provides better surface finishes, and provides longer life than silica …
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Carbon capture and storage in low-carbon concrete using …
2.1. Materials. Olivine ((Mg, Fe) 2 SiO 4) was obtained from Sibelco Nordic AS (Aaheim Plant).X-ray diffraction (XRD) used a Malvern Panalytical Empyrean diffractometer over a scanning range from 5 to 75°2θ, with Ni-filtered CuKα radiation, at a scanning rate of 0.1°2θ s −1.Powder samples (approx. 1 g) were ground in an agate …
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SEM graph showing olivine sand particles with sizes
Download scientific diagram | SEM graph showing olivine sand particles with sizes ranging from a few micrometres to approximately 1 mm. from publication: Laboratory-scale model of carbon dioxide ...
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Frontiers | Potential of Acid-Activated Bentonite and SO3H
Specific surface area of the original bentonite was measured by Brunauer, Emmett, and Teller (BET) method at 45 m 2 /g and was best improved after 5 N-acid activation (95–98°C, 2 h) reaching 68 m 2 /g. MWCNTs was synthesized through methane decomposition (Co-Mo/MgO catalyst, 900°C) during the chemical vapor deposition …
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The mechanism of dissolution of forsterite, olivine and …
1. Introduction. The olivine group of minerals, which includes the minerals forsterite (Mg 2 SiO 4), fayalite (Fe 2 SiO 4), and tephroite (Mn 2 SiO 4), has received a lot of recent attention due to their utility for carbon dioxide sequestration and their potential significance for the origin of life (Kump et al., 2000, Kuszuba et al., 2013, Schuiling and …
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