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The effects of mechanical activation on the soda roasting of chromite were investigated in this study. Structural changes in mechanically activated chromite were examined using X-ray diffraction analysis (XRD), surface area analysis (BET) and scanning electron microscopy (SEM).
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2.2 Mechanical activation of chromite samples The mechanical activation of chromite ore was performed in a planetary mill PuLuerisette 6 (FRITSH, Germany). 50 g of chromite ores were ground with 400 g
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The carbothermal reduction of mechanically activated chromite with graphite under an argon atmos-phere was investigated at temperatures between 1100 and 1400uC and the …
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The effects of mechanical activation on the soda roasting of chromite were investigated in this study. Structural changes in mechanically activated chromite were …
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The flow law for diffusion creep of chromite spinel has been determined from uniaxial compressive creep experiments at temperatures of 1400° to 1600 °C and a pressure of 0.1 MPa on polycrystalline samples of Mg(Cr,Al)2O4 with grain sizes of ~ 10 μm and chromium mole fractions, XCr, of 0.25, 0.50, and 0.75. Under our experimental …
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Synergistic strengthening mechanisms of mechanical activation-microwave reduction for selective lithium extraction from spent lithium batteries. Waste Management 2023, 155, 281-291. ... (Ball Milling and Sodium Sulfide) for Mechanochemical Treatment of Soda Ash Chromite Ore Processing Residue. Journal of Hazardous Materials 2021, 415 …
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Effect of mechanical activation on alkali leaching of chromite ore @inproceedings{2010EffectOM, title={Effect of mechanical activation on alkali leaching of chromite ore}, author={ and and and and }, year={2010} },, +2 authors ; Published 2010; Geology
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In addition, Apaydin et al. (2011) studied the effect of mechanical activation on carbothermal reduction of chromite with graphite, and found that the activation process led to amorphisation and structural disordering in chromite, and accelerated the reduction and metallisation in the mixture of chromite and graphite. Mechanical activation can ...
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Experimental Study of the Combined Effects of Al 2 O 3, CaO and MgO on Gas/Slag/Matte/Spinel Equilibria in the Cu–Fe–O–S–Si–Al–Ca–Mg System at 1473 K (1200ºC) and p ( SO 2 ) = 0.25 atm. Svetlana Sineva. Denis Shishin. Evgueni Jak. Research Article Open access 24 March 2023 Pages: 599 - 612.
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Chromite overburden (COB) is a mine waste generated in chromite ore processing which mainly consists of iron, chromium and nickel (<1%). ... The application of Mechanical activation (MA) in the ...
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The mechanical activation of chromite concentrate was performed in a Planetary Mono Mill Pulverisette 6 under the following conditions: the weight of the sample was 10 g; the weight and diameter of tungsten carbide (WC) balls were 200 g and 10 mm, respectively; the grinding bowl was 250 ...
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The economic and technical values of the hydrometallurgical or leaching processing are a function of its reaction rates and these reaction rates are enhanced by mechanical activation (MA) in hydrometallurgical processing. This study presents a novel derived theoretical model for MA-assisted leaching in investigating the effects of ball mill …
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Abstract The carbothermal reduction of mechanically activated chromite with graphite under an argon atmosphere was investigated at temperatures between 1100 and 1400°C and the effects of the mechanical activation on chromite structure were analysed by X-ray diffraction, scanning electron microscopy and specific surface area measurement. An …
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This chapter contains sections titled: Introduction Crystal Structure of Chromite Minerals Thermal Decomposition of Chromites Alkali Roasting of Chromites Leaching of Chromite Minerals Ch...
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Tests for mechanical activation were accomplished in a vibration mill type ML-30 with a capacity of 0.5–0.2 kWh and a rotation of 1500–2400 min –1. The dimension of original chromite concentrate before grinding was 0.074 mm (about 95%), and after grinding less than 10 μm. The capacity of the steel drum was 150 cm 3. The grinding …
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The soda-ash roasting of chromite ore processing residue for the reclamation of chromium", Metallurgical and Materials transactions B 32 (B) (2001), ... Z. Yang et al., "Effect of mechanical activation on alkali leaching of chromite ore", Transactions of Nonferrous Metals Society of China 20 (2010), 888–891.
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The approaches for enhancing the chromite reduction can be generally classified into four categories by addressing the above-mentioned kinetic limitations. (1) Pre-treatment of chromite to enhance its reactivity before reduction, including pre-oxidation or heat treatment [18–20], and mechanical activation of chromite by high-energy milling [21].
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Yarkadaş and Yildiz (2009) studied the effect of mechanical activation on soda roasting of chromite and could improve the conversion from 18% (non-activated chromite) to 74% (120 min activated ...
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adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A
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The carbothermal reduction of chromite with graphite under argon atmosphere was studied by differential thermal analysis up to 1350°C and the effects of mechanical activation on the chromite ...
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In the case of chromite mechanochemical activation for 120 min, the Cr 2 O 3 content increased from 52,68 to 55.09%, and the FeO and MgO contents decreased …
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2.1. Effect of Mechanical Ball Milling. The effect of mechanical ball milling was studied. In the experiments, the w/w % H 2 SO 4 was 50%, the liquid–solid ratio (L/S) was 8 mL/g, the reaction temperature (T) was 373 K, and the reaction time (t) was 6 h. Figure Figure1 1 shows that a longer ball-milling time can result in a better leaching effect …
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It is no longer a discovery that mechanochemistry positively influences the extractive metallurgy and other allied industries' circular economy. However, a pertinent use and control of its processing route and parameters need to be looked into for effective sustainability of the industries and resources involved. The application of Mechanical …
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With the progress of reduction, refractory oxide layers gradually formed on/close to the surface of each chromite particle, causing the shift of the rate-limiting factor from …
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of conversion from chromite to chromate by soda roasting at 800 °C for non-activated chromite was found to be 18% compared to 74% for chromite that had been activated for 120 minutes at the same ...
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The carbothermal reduction of chromite with graphite under argon atmosphere was studied by differential thermal analysis up to 1350°C and the effects of mechanical activation on the chromite ...
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The impact of mechanical activation on the bioleaching of pyrite was studied, and the mechanisms were elucidated by DFT (density functional theory). ... Traditional wet and dry Chromite Ore Processing Residue (COPR) detoxification methods consume acid for pH adjustment and produce greenhouse gasses (CO 2), yielding …
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This reflects the partial amorphization and structural disordering in chromite. Mechanical activation has already been reported to amorphize mineral particles[10, 11]. Tromans and Meech[13,14 ...
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This type of milling can also initiate phase transformations 109 or activate powders for further processing 110,111, thus reducing the length of time needed for mechanical activation to obtain ...
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The results showed that the carbothermal reduction temperatures of reducible oxides in the chromite spinel were decreased after mechanical activation, due to …
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