Flotation recovery of chromite as a function of pH at constant SDS concentration 1 x 10 -4 M is shown in figure 2. The four separate curves of the figure demonstrate the effect of aging of dry chromite that had been ground to flotation size (100/150 mesh) on subsequent flotation behavior. The fresh
For the last 40 years, global economic growth has resulted in a rapid increase in the demand for a range of metals and metal oxides for high technology applications, including titanium dioxide (TiO 2) and chromium oxide (Cr 2 O 3) (Brown et al., 2015).This has led to a rise in the consumption of their mineral oxides, TiO 2 and Cr 2 O 3, derived …
To explicate the thermodynamics of the chromite ore lime-free roasting process, the thermodynamics of reactions involved in this process was calculated and the phrases of sinter with different roasting times were studied. The thermodynamics calculation shows that all the standard Gibbs free energy changes of the reactions to form …
To obtain pure chromium, chromite is first treated with molten alkali and oxygen, converting all of the chromium to the alkali chromate, and the latter is dissolved in water and eventually precipitated as sodium dichromate, Na 2 Cr 2 O 7.The dichromate is then reduced with carbon to chromium sesquioxide, Cr 2 O 3, and that oxide in turn is …
1 Determination of Breakage Distribution Function of fine chromite ores with Bed Breakage Method H. Hosseinzadeh1,*, L. Ergün2, 1 Mining Engineering Department, Hacettepe University, Beytepe ...
Why is Chromite Important for Renewable Energy Use? Chromite is the only ore of chromium, making it especially important for mining and obtaining chromium. …
Solid-state reduction of roast Movat chromite ore with carbon was carried out as a function of the C/FeO ratio at temperatures ranging from 800 °C to 900°C. The reduction was studied using thermogravimetric analysis (TGA). A two-stage mechanism consisting of the reduction of FeO with carbon monoxide and the regeneration of CO by …
The rate of a solid-state reaction can then be defined by the following general equation: (2) d α dt = A exp-E RT f (α) where f(α) is a function describing the reaction model that depends on the reaction mechanism (Gotor et al., 2000), E the activation energy, A the pre-exponential Arrhenius factor, R the universal gas constant and T the …
A cumulus mineral in ultramafic portions of layered maficigneous rocks; an accessory mineral in alpine-type peridotites; also detritalmon in all meteorites, except carbonaceous chondrites, and in lunar marebasalts. Chromite is a common constituent of peridotite rocks and …
Chromite ((ce{FeCr2O4})) is the most commercially useful ore, and is extensively used for extraction of chromium. Chromium is produced in two forms: Ferrochrome by the reduction of chromite with coke in an electric arc furnace. A low-carbon ferrochrome can be produced by using ferrosilicon instead of coke as the reductant.
chromite roasting as a function of temperature increase. Thus far, the formation of NaCrO 4 2-ions remain hy-pothetical, however performing the leaching experi-
Chromite is a dark grey, metallic, oxide mineral. Due to its metallic luster and occasional magnetic properties, chromite is often mistaken for magnetite. Chromite can often be found in basic igneous rocks, and in the metamorphic and sedimentary rocks created by rocks containing chromite that were affected by weather. A particularly useful ...
Chromite is the only ore of chromium, a metal essential for making stainless steel, nichrome, chrome plating, pigments, refractories, chemicals and pharmaceuticals.
Chromite is the main source of the metal chromium, a metal used to induce hardness, toughness and chemical resistance in steel. It was named after its chemical …
Following the same rationale, the modifying action of fluorosilic acid as function of pH, as well as the effect of its concentration during chromite and serpentine flotation using sodium oleate as collector are presented in Fig. 6, respectively. FSA seems to be an effective medium for selective separation of chromite from serpentine.
PDF | On Oct 10, 2012, H. Hosseinzadeh and others published Determination of Breakage Distribution Function of fine chromite ores with Bed Breakage Method | Find, read and cite all the research ...
Research subject. Chromite ores and massive chromitites with alumina (low chromium) chrome spinelide (the Podennoye deposit deposit) and chromite ores with high-chromium chrome spinelide (Kurmanovskoye deposit) of the Alapaevsky hyperbasite massif. Materials and methods. Samples of chromite ores and massive chromitites …
In the current research, the permittivities of various mixtures of several pyrometallurgical raw materials plus carbonaceous reducing agents were determined as a function of both temperature and frequency, using the cavity perturbation technique. The raw materials investigated were an oolitic iron ore, an electric furnace dust and a …
UG2 chromitite is known for enrichment of PGEs, and extends for nearly the entire 400 km length of the Eastern and Western limbs (Mondal et al., 2006).The UG2 horizon represents typically fine-grained massive and stratiforn chromite mineralization having a sharp contact with anorthosite (Fig. 3.5).It is the world's largest single PGE–Chromitite orebody and …
The chromite fraction was then separated from secondary silicates (e.g., serpentine) manually. After extraction of the chromite fraction, the chromite grains were leached using 6.2 N HCl and 5% HF, following the method of Snow et al. (1994). First, chromite was maintained in the leaching solution for 10 minutes, then the solution was removed.
Chromium is extracted from chromite ore. Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4).. Companies in South Africa supply chrome ore from the lower and middle group …
Chromite is an oxide mineral belonging to the spinel group, a complex mineral containing magnesium, iron, aluminum, and Cr in varying proportions, depending on the deposit, …
Chromite, an oxide of iron, magnesium, aluminum, and chromium, is the only ore mineral of chromium. In nature, chromite deposits are generally of two major types: stratiform (layered) and podiform (pod shaped). Both …
Knowledge of the chromium ore minerals proper and their associated rocks-forming minerals is needed to explore new chromite fields and to predict the efficiency of individual methods for the beneficiation of chromite ores. It is important also to know the physicochemical properties of individual mineral fractions of chromite ores and …
The results of single mineral flotation and grinding tests showed that while the floatability of chromite increased as a function of its angularity degree, a reverse trend was obtained for ...
Chromite ((ce{FeCr2O4})) is the most commercially useful ore, and is extensively used for extraction of chromium. Chromium is produced in two forms: Ferrochrome by the reduction of chromite with coke in an …
Download scientific diagram | Flocculation-dispersion behavior of chromite and serpentine as a function of pH from publication: Selective flocculation behavior of chromite and serpentine ...
Chromite is a dark, opaque mineral with a high specific gravity and metallic luster. It is typically found in the form of euhedral crystals, irregular grains, or as interstitial material between other minerals in the host rock. Chromite is composed of chromium, iron, and oxygen, with variable amounts of magnesium, aluminum, and other elements.
Chromite ore is added along with a carbon-containing reducing agent and a flux, typically silica and then smelted in the SAF. This process is very energy intensive, ... carbide phase is a function of the availability of carbon during reduction. For carbon-rich conditions, Cr 7C 3 is formed, while for carbon-poor conditions, Cr 23C 6
The D F for each chromite ore was obtained by first developing an M(X < x)/M T versus x/X L on log–log plots and determining the slope of the best-fit line through the data points using linear regression. The measured data points showed an appropriate pattern of linearity on the M(X < x)/M T versus x/X L plots as seen in Fig. 2, Fig. 3, Fig. …
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