Effect of mechanical activation on carbothermal reduction of …
chromite after mechanical activation and the phase formations in the products after reduction. The degree of amorphisation A of the mechanically activated chromite was calculated from equation (1 ...
اقرأ أكثر
Effect of mechanical activation on alkali leaching of chromite ore
DOI: 10.1016/S1003-6326(09)60231-4 Corpus ID: 137033578; Effect of mechanical activation on alkali leaching of chromite ore @article{Zhang2010EffectOM, title={Effect of mechanical activation on alkali leaching of chromite ore}, author={Yang Zhang and Shili Zheng and Hao Du and Hong-bin Xu and Yi Zhang}, journal={Transactions of Nonferrous …
اقرأ أكثر
Preparation of Superconcentrate and Chromium Powder from …
Mechanochemical activation (friction, breakdown, deformation) is used more extensively in metallurgy as a method of initiating and accelerating chemical reactions.
اقرأ أكثر
Effect of mechanical activation on carbothermal reduction 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 ...
اقرأ أكثر
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 …
اقرأ أكثر
Materials | Free Full-Text | Enrichment Characteristics of Cr in
Chromium slag is the waste residue generated by the industrial process of extracting chromium (Cr) from chromite ore. Due to different needs for chromite quality in the target product, the extraction processes for chromium (Cr) are also different, leading to diverse compositions and properties for chromium slag [1,2,3].Chromium salt …
اقرأ أكثر
Effect of mechanical activation on the synthesis of a magnesium
A magnesium aluminate spinel powder (72 % Al2O3 & 28 % MgO) was prepared with mechanical activation. Samples were sintered in a temperature range of 1400–1750 °C. The final sintered products were characterized with densification, phase and microstructural analyses and a hardness measurement to evaluate the influence of …
اقرأ أكثر
Kinetics and mechanisms of the carbothermic reduction of chromite in
Carbothermic reduction of chromite in the presence of nickel as the alloying element was investigated in a wide temperature range up to 1500 °C using thermogravimetric analysis coupled with continuous off-gas analysis (TG-DSC-MS). Both isothermal and non-isothermal linear heating tests were performed for the kinetic study …
اقرأ أكثر
Chromium obtaining from Armenian chromite concentrate by SHS …
thermal processing and mechanical activation of chromites points to the advantage of the latter. Based on experimental investigations of the aluminothemric reduction o f Tapasar chromite
اقرأ أكثر
Investigation of carbothermal reduction of mechanically activated
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 ...
اقرأ أكثر
XRD patterns of activated and non-activated chromite …
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 ...
اقرأ أكثر
Enhanced Gold Recovery from Alkaline Pressure Oxidized
By adjusting the mechanical activation conditions described in Table 1, the surface and bulk properties of the samples were changed, affecting the leaching recovery of gold or the kinetics of the process [16,17,18,19,20, 22].Baláž et al. [16, 17] reported that increasing ratio of surface area to the bulk disordering shows a positive effect on the …
اقرأ أكثر
Selective recovery of vanadium from high-chromium
High Chrome Vanadium slag requires mechanical activation. ... [34] and chromite [35]. Our previous study revealed that mechanical activation significantly reduces the roasting temperature and enhances the leaching efficiency of vanadium in the calcification roasting-acid leaching vanadium extraction process [36]. Therefore, in this …
اقرأ أكثر
One-step natural pyrite-assisted mechanochemical
Traditional wet and dry Chromite Ore Processing Residue (COPR) detoxification methods consume acid for pH adjustment and produce greenhouse gasses (CO 2), yielding potential secondary pollution.It is imperative to develop an environmentally-friendly, efficient, and effective method for COPR treatment. This study reported the one …
اقرأ أكثر
CARBOTHERMAL REDUCTION KINETICS OF MECHANICALLY ACTIVATED CHROMITE …
The carbothermal reduction kinetics of mechanically activated chromite with graphite under an argon atmosphere was investigated at temperatures between 1100 and 1400°C. Zhuravlev-Lesokhin-Tempelman (ZLT) method was used in the reduction kinetics for non-activated chromite and the activation energy was calculated as 401,7 kJ/mol. Solidstate …
اقرأ أكثر
Effect of Ball Mill Parameters' Variation on the Particles of a
Effect of Ball Mill Parameters' Variation on the Particles of a Mechanical Activation-Assisted Leaching: A Hydrometallurgical Mechanics ... Chen QY, Hu HP, Yin ZL, Chen Y (2012) TiO 2 nanoparticles mechanical activation on alkali leaching of chromite ore. Trans prepared by hydrochloric acid leaching of mechanically activated Nonferrous Met ...
اقرأ أكثر
Study on mechanism of mechanical activation | Semantic Scholar
DOI: 10.1016/S0921-5093(97)80028-7 Corpus ID: 135542239; Study on mechanism of mechanical activation @article{Chen1997StudyOM, title={Study on mechanism of mechanical activation}, author={Ying Chen and T. Hwang and Moses Marsh and James Williams}, journal={Materials Science and Engineering A-structural Materials Properties …
اقرأ أكثر
Activation pretreatment of limonitic laterite ores by alkali-roasting
Activation pretreatment of Cr-containing limonitic laterite ores by NaOH roasting to remove Cr, Al, and Si, as well as its effect on Ni and Co extraction in the subsequent pressure acid leaching process was investigated. Characterization results of X-ray diffraction (XRD) and scanning electron microscopy/X-ray energy dispersive …
اقرأ أكثر
Effect of Ball Mill Parameters' Variation on the Particles of a
This work has investigated the effect of variation of the mill-ball parameters on the particle sizes in mechanical activation-assisted leaching and proved the limitation …
اقرأ أكثر
Efficient separation of fluoride and graphite carbon in spent …
The mechanical activation device used in this work was a planetary ball mill (Yxqm–4L, Changsha MITR Instrument Equipment Co., Ltd, China) consisting of four polyurethane pots (inner diameter of 112 mm, height of 131 mm, and inner ... Effect of mechanical activation on alkali leaching of chromite ore. T. Nonferr. Metal Soc. (2010)
اقرأ أكثر
Effects of mechanical activation on the HCl leaching behavior of
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 ...
اقرأ أكثر
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).
اقرأ أكثر
EFFECTS OF MECHANICAL ACTIVATION ON THE …
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 ...
اقرأ أكثر
Structural, photocatalytic, and anticancer activity Ni
EDS analysis confirmed the presence of elements such as Cu, Ni, Cr, and O in nickel-doped copper chromite. Two major absorption band are observed in FTIR spectra, which confirms the stretching frequencies of the tetrahedral and octahedral sites. ... Sobhani-Nasab et al. 2016), ball milling and mechanical activation method (Sun et al. …
اقرأ أكثر
Schematic diagram of the laboratory vertical stirred mill.
Nov 2023. 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 ...
اقرأ أكثر
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 …
اقرأ أكثر
Effect of mechanical activation on alkali leaching of chromite ore
DOI: 10.1016/S1003-6326(09)60231-4 Corpus ID: 137033578; Effect of mechanical activation on alkali leaching of chromite ore @article{Zhang2010EffectOM, title={Effect …
اقرأ أكثر
Preparation and properties of ultra-fine chromium
The preparation of hydroxyl chromium oxide by hydrogen reduction of disodium chromate and particulate hydroxyl mechanical activation features were studied. Then with self-made hydroxyl chromium as the raw material, a direct reduction and carburization process was used to prepare ultra-fine chromium carbonization. Through …
اقرأ أكثر
Reduction mechanism of chromite spinel with carbon
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 ...
اقرأ أكثر
Leaching of chromite ore in concentrated KOH by catalytic …
An investigation on the kinetics of chromium dissolution from Philippine chromite ore at high oxygen pressure in KOH sub-molten salt solution [J]. …
اقرأ أكثر