Kinetics and mechanisms of the carbothermic reduction …
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 …
Effects of mechanical activation on the HCl leaching …
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 ...
MECHANICAL ACTIVATION OF LIZARDITE BY DRY …
Mechanical activation of Ca/Mg silicates by grinding is a pre-treatment of some mineral carbonization processes. In this study, the mechanical activation of lizardite ore from a chromite beneficiation plant waste by grinding in a stirred media mill was studied. For grinding studies, grinding times of 10-20-30 min and stirring speeds of 600 …
EFFECTS OF MECHANICAL ACTIVATION ON THE SODA …
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 ...
Physical Chemistry of Roasting and Leaching Reactions for …
A.M. Amer, I.A. Ibrahim, "Leaching of a low grade Egyptian chromite ore", Hydrometallurgy 43 (1996), 307–316. Article Google Scholar 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.
Sustainability of Valuable Metals Recovery from Hazardous …
DOI: 10.1007/s40831-022-00579-9 Corpus ID: 252188473; Sustainability of Valuable Metals Recovery from Hazardous Industrial Solid Wastes: The Role of Mechanical Activation @article{Odebiyi2022SustainabilityOV, title={Sustainability of Valuable Metals Recovery from Hazardous Industrial Solid Wastes: The Role of Mechanical Activation}, …
Effect of mechanical activation on alkali leaching of chromite …
Corpus ID: 126451803; 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} }
Effect of Ball Mill Parameters' Variation on the Particles …
Effect of Ball Mill Parameters' Variation on the Particles of a Mechanical Activation‑Assisted Leaching: A Hydrometallurgical Mechanics ... on the MA eect on the alkali leaching of chromite ore. Their study shows that 97% recovery ratio was achieved when the chromium ore was mechanically activated, but
Effect of particle size on the reduction degree of chromite …
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 ...
Effect of mechanical activation on carbothermal reduction of …
Abstract. The carbothermal reduction of mechanically activated chromite with graphite under an argon atmosphere was investigated at temperatures between …
Low temperature formation of barium titanate in …
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 ...
(PDF) Leaching of Valuable Elements from the Waste Chromite …
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 ...
Effect of Ball Mill Parameters' Variation on the Particles of a
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 …
Physical Chemistry of Roasting and Leaching Reactions for …
This chapter contains sections titled: Introduction Crystal Structure of Chromite Minerals Thermal Decomposition of Chromites Alkali Roasting of Chromites Leaching of Chromite Minerals Ch...
Effects of Mechanical Activation on the Soda Roasting of Chromite
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).
Effect of mechanical activation on carbothermal reduction of chromite
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 …
Preparation of porous ceramometal composites through the …
Basic stages of porous cermets preparation from MeAl (Me = Cr, Cu, Co, Fe) powders are elaborated including mechanical activation of Me–Al blends, soft hydrothermal treatment of mechanically alloyed blends followed by thermal treatment thus allowing to control their mechanical, thermophysical and textural properties. …
Mechanical activation in hydrometallurgy | Semantic Scholar
Semantic Scholar extracted view of "Mechanical activation in hydrometallurgy" by P. Baláž ... Effect of mechanical activation on alkali leaching of chromite ore. Yang Zhang S. Zheng H. Du Hong-bin Xu Yi Zhang. Materials Science. 2010; 37. Save. Mechanical activation of solids in processing of minerals and wastes.
Pressure oxidative leaching of Indian chromite ore in …
According to Amer and Ibrahim (1996), mechanical activation of chromite ore particles with alkali liquor permitted to decrease the reaction temperature at an O 2 partial pressure of 1.0 MPa. However, the difficulty of mechanical activation on a large scale limits its industrial application.
EFFECTS OF MECHANICAL ACTIVATION ON THE …
The carbothermal reduction of mechanically activated chromite with metallurgical coke under an argon atmosphere was investigated at temperatures between 1100 and 1400 ...
Volume 9, Issue 2 | Journal of Sustainable Metallurgy
Mechanical Activation-Assisted Recovery of Valuable Metals from Black Mass in the Form of Fe/Cu Alloys. Safoura Babanejad; Hesham Ahmed; ... Reduction of Carbon Footprint Through Hybrid Sintering of Low-Grade Limonitic Nickel Laterite and Chromite Ore. Yuxiao Xue; Deqing Zhu; Xuewei Lv; Research Article 28 March 2023 …
Effects of Mechanical Activation on the Soda Roasting of …
The effects of mechanical activation on the soda roasting of chromite were investigated in this study. Structural changes in mechanically activated chromite were …
Decomposition of chromite ore by oxygen in molten …
Many efforts have been made to decrease the reaction temperature including mechanical activation of the chromite ore in sodium hydroxide at temperatures below 240 °C under pressurized oxygen (10 bar). This led to 98% chromium extraction in 120 min (Amer and Ibrahim, 1996). Recently, a novel process of oxidizing chromite ore using …
Extraction of Cu and Cr from a spent Cu–Cr catalyst: …
Cuprous chromite phase is selectively mechanically activated. Sulfuric acid leaching and alkali roasting followed by water leaching techniques were employed for Cu and Cr recovery respectively. ... Mechanical activation is generally carried out through high energy ball milling process in which the particles go through repeated fracturing and ...
Kinetics and mechanisms of the carbothermic reduction …
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].
Deformation of Al-Cr spinel in the diffusion creep regime: mechanical …
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 …
Effect of mechanical activation on alkali leaching …
Mechanical activation was used to improve the extraction of chromium in molten NaOH. It is observed that the extraction ratio reaches 97% after leaching for 200 min when chromite ore is ...
Effect of SiO2 addition on solid state reduction of chromite
The effect of SiO 2 addition on the solid state reduction of a Greek chromite concentrate, at 1300 and 1400°C, has been studied. Addition of SiO 2 in the chromite concentrate-graphite mixture generally promoted reduction at 1400°C. However, there was a critical content of SiO 2 after which lower final reduction degrees at higher silica contents were attained. …
Effect of mechanical activation on alkali leaching of chromite …
2) The effect of mechanical activation mainly contributes to the decrease in particle size and the increase of lattice distortion. The mean particle size decreases from 39.2 m to 3.7 m when chromite ore is activated for 10 min. The lattice distortion ratios of …
Effects of mechanical activation on lithium extraction from a
DOI: 10.1016/J.MINENG.2016.12.001 Corpus ID: 102411045; Effects of mechanical activation on lithium extraction from a lepidolite ore concentrate @article{Vieceli2017EffectsOM, title={Effects of mechanical activation on lithium extraction from a lepidolite ore concentrate}, author={Nath{'a}lia Vieceli and Carlos A. …