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Chromite an overview ScienceDirect Topics
Chromite ore is mined in over 20 countries, but about 80% of production originates from four countries; in 2007–2009, South Africa: correlation with the UG-2 in the eastern and western limbs and evidence of variable assimilation of footwall rocks. Mineralium Deposita, 55, available at On-Line First. Chromite occurs mainly in basic to ultrabasic rocks. In ophiolites it forms pods of
Chromite Wikipedia
Chromite is found as orthocumulate lenses of chromitite in peridotite from the Earth's mantle.It also occurs in layered ultramafic intrusive rocks. In addition, it is found in metamorphic rocks such as some serpentinites. Ore deposits of chromite form as early magmatic differentiates. It is commonly associated with olivine, magnetite, serpentine, and corundum.
Chromite Ore an overview ScienceDirect Topics
Chromite ore is usually a combination of spinels with associated minerals such as calcite, magnetite, talc, serpentines and uvarovite. Chromites crystals exhibit an octahedral structure similar to magnetite. The Cr 3+ ions are in the octahedral position with oxygen. The chromium rich phase is antiferromagnetic. The mineral Fe 2+ [Cr 2 3+]O 4 2− is ferrimagnetic with a very low Curie
Chromite Chromium Ore, Properties, Uses and Occurrence
02/07/2019· Chromite is the most important ore of chromium. Crystals are uncommon, but when found they are octahedral. Chromite is usually massive or in the form of lenses and tabular bodies, or it may be disseminated as granules. It is sometimes found as a crystalline inclusion in diamond. Chromite is dark brown to black in color and can contain some magnesium and aluminum. Chromite is most commonly
Chromite: The only mineral ore of chromium metal
The chromium consumed by United States industry comes from: A) other countries in the form of chromite ore, ferrochromium or chromium metal; or, B) chromium recovered from recycled metals. Over half of the chromium used in the United States today is from recycling. Because chromium is essential for the defense and prosperity of the United States, the federal government maintains a stockpile of
Chromite Mineral Data
Chrome iron ore : Chromic iron : Ferrichromite magnetic, altered : ICSD 20819 : PDF 34-140 : Chromite Image: Images: Chromite Antigorite. Optical Properties of Chromite : Gladstone-Dale: CI meas= 0.092 (Poor) where the CI = (1-KPDmeas/KC) CI calc= 0.145 (Poor) where the CI = (1-KPDcalc/KC) KPDcalc= 0.22,KPDmeas= 0.2336,KC= 0.2573 Ncalc = 2.16 2.31 : Optical Data:
Chromite mining Oregon Encyclopedia
Chromite is a mineral that contains chromium. It is considered a strategic mineral, which generally means that it is necessary for military and industrial use during periods of national emergency. The strategic mineral concept was created during World War I and became law just prior to World War II with the passage of the Strategic Minerals Act
Rapid Analysis of Chromite and Chrome Ore
ents of chromite and chrome ore permit the complete analysis of a dozen or more samples to be performed in about 5 days with a precision comparable to that of the more conventional methods. The sample is fused with sodium peroxide in a zirconium crucible. The major constituents are determined from aliquots of a single solution of sample prepared by acidifying a water extraction of the fusion
Chromite Ore Gamer Escape: Gaming News, Reviews,
Chromite Ore. Page; Discussion; Edit; History; Talk; Contributions; Create account; Log in; Item#19959. Chromite Ore Stone. Item. Patch 4.0 Description: A decent-sized piece of rock containing the metal chromium. Requirements: Level 1 Item Level 300 Statistics & Bonuses: Repairs, Recycle & Style: Stack Size 999 Sells for x 3 4: Rebuild Lists. Acquisition Uses Mining. Node (Slot) Node Req
Chromite typology and composition characterized through
01/10/2017· Two main world-wide types of chromite ore deposits are presently in production: those related to layered igneous intrusions (stratiform ores) and those located in the mantle section of ophiolite sequences (podiform ores). Other types of chromite occurrences, as well as metamorphic modifications of the main types (e.g. in ophiolites), are also known. The ores chosen for this work were selected
Chromite an overview ScienceDirect Topics
Chromite ore is mined in over 20 countries, but about 80% of production originates from four countries; in 2007–2009, South Africa: correlation with the UG-2 in the eastern and western limbs and evidence of variable assimilation of footwall rocks. Mineralium Deposita, 55, available at On-Line First. Chromite occurs mainly in basic to ultrabasic rocks. In ophiolites it forms pods of
Correlating common breakage modes with impact
01/11/2020· Discrete size distributions of the narrow-size fractions of the chromite ore broken at different specific impact energies. As discussed in Section 3.1,progeny particles originated at the lowest breakage mode will be the mixture of the cone of fines and the fragments of meridian cracking ( Fig. 1 b) in which the former will occupy a significantly smaller volume than the latter.
Coexistence of Cr- and Al-rich ophiolitic chromitites in a
disseminated ore, and a positive correlation exist be-tween the thick of the dunite envelope and Cr 2O 3 content of chromite in the hosted chromitite. The studied chromitite bodies are concordant with the fo- liation of the enclosing peridotites, but Kovács et al. (1997) mention that some others are clearly discor-dant. Unusual rock types, spatially related with some ore bodies, consist of
Chromium Minerals Education Coalition
Chromium. Chromium (Cr) is a hard, bluish metallic element. The only ore of chromium is the mineral chromite and 99 percent of the world’s chromite is found in southern Africa and Zimbabwe. Geologists estimate that there are about 11 billion tons of mineable chromite ore in the world, enough to supply the current demand for hundreds of years.
Leaching of chromite ore in concentrated KOH by catalytic
01/04/2017· The impacts of temperature, KOH-to-chromite ore mass ratio, CuO-to-chromite ore mass ratio, and gas flow rate on the chromium leaching rate were investigated. The results indicated that CuO played an important role in improving the chromium leaching rate. The leaching rate reached 98% after leaching for 6 h when CuO was applied, whereas it was only 60.8% without CuO under the same
Direct comparison on mechanical and digital size
01/11/2003· Chromite ore samples from the Länsiviia open pit of the Elijärvi Mine, Kemi, Finland were taken for grain/particle size determination of the chromite in the ore. The samples were selected from a relatively less fractured area. Seven to ten centimeter long pieces of chromite ore samples were treated by a powerful electric pulse disaggregator called Franka 1 at the Forschungs––Zentrum
FACTORS AFFECTING THE REDUCIBILITY OF SINTERED CHROMITE
The correlation between the pellet characteristics and reduction behavior was shown and its influence on industrial-scale furnaces was discus sed. Factors worth of consideration are for instance, the extent of oxida- tion during sintering, slag formation and chemistry in respect of molten state reduction, and the grain size of the chromite mineral in the raw material in respect of kinetic
(PDF) A Comparative Study on PSD Models for Chromite
Lasir Ore: This was a disseminated type (1st stage) of chromite ore. The alteration products were serpentine as chlorite and serpentinized olivine. The chromite crys- Sieving tals were generally broken due to fragmentation effects +3.35 mm to obtain cataclastic texture. Yunuskuyu Ore: The Leo- Cone crusher par type of chromite ore comprised dominantly of ser- (2nd stage) pentinized olivine
v117n11a9 SEM image processing as an alternative method to
Chromite ore has remained the only commercially viable source of new chromium (Cr) units since its discovery (Riekkola-Vanhanen, 1999). South Africa holds the majority of the world’s exploitable chromite reserves (Cramer, Basson, and Nelson, 2004). More than 90% of all chromite is smelted using pyrometallurgical carbothermic reduction to form various grades of ferrochrome (FeCr) a crude
Chromium Minerals Education Coalition
Chromium. Chromium (Cr) is a hard, bluish metallic element. The only ore of chromium is the mineral chromite and 99 percent of the world’s chromite is found in southern Africa and Zimbabwe. Geologists estimate that there are about 11 billion tons of mineable chromite ore
Direct comparison on mechanical and digital size
01/11/2003· Chromite ore samples from the Länsiviia open pit of the Elijärvi Mine, Kemi, Finland were taken for grain/particle size determination of the chromite in the ore. The samples were selected from a relatively less fractured area. Seven to ten centimeter long pieces of chromite ore samples were treated by a powerful electric pulse disaggregator called Franka 1 at the Forschungs––Zentrum
An investigation on the kinetics of chromium dissolution
01/07/2013· In comparison with the former liquid oxidization methods of chromite ore, the reaction rate is increased remarkably in this new process. In other leaching processes of chromite ore in KOH sub-molten salt solution (Sun et al., 2009, Xu et al., 2005, Zhang et al., 2005, Zheng et al., 2006), the leaching temperatures are generally higher than 300 °C.
FACTORS AFFECTING THE REDUCIBILITY OF SINTERED CHROMITE
The correlation between the pellet characteristics and reduction behavior was shown and its influence on industrial-scale furnaces was discus sed. Factors worth of consideration are for instance, the extent of oxida- tion during sintering, slag formation and chemistry in respect of molten state reduction, and the grain size of the chromite mineral in the raw material in respect of kinetic
v117n11a9 SEM image processing as an alternative method to
Chromite ore has remained the only commercially viable source of new chromium (Cr) units since its discovery (Riekkola-Vanhanen, 1999). South Africa holds the majority of the world’s exploitable chromite reserves (Cramer, Basson, and Nelson, 2004). More than 90% of all chromite is smelted using pyrometallurgical carbothermic reduction to form various grades of ferrochrome (FeCr) a crude
ARTICLES CSA Global
correlation between SG or bulk density and rock chemistry, such as with relatively simple mineral assemblages such as some barite and chromite ores. Assuming that a barite ore consists of discrete barite (BaSO 4) and quartz (SiO 2) or that chromitite ore consists essentially of chromite and pyroxene minerals, it should be possible to estimate bulk density based on XRF ‘whole rock’ analyses
LITHOLOGICAL MAPPING OF OPHIOLITE COMPLEX WITH
2.7 Surface mining techniques of chromite ore deposits 32 2.8 Ground mining techniques of chromite ore deposits 33 2.9 Prices at USD 1.5/lb (Ackerman, 2009) 35 2.10 Different band ratio have been utilized in the prior studies 36 2.11 Compares prior studies from mapping point of view 37 2.12 The study area in previous work 38 3.1 Research Phases 59
Distinguishing strength from toughness. • Understanding
Figure 8.2 (a) The tear test. (b) The impact test. Both are used as acceptance tests and for quality control, but neither measures a true material property.
Geometallurgy Wikipedia
Geometallurgy relates to the practice of combining geology or geostatistics with metallurgy, or, more specifically, extractive metallurgy, to create a spatially or geologically based predictive model for mineral processing plants. It is used in the hard rock mining industry for risk management and mitigation during mineral processing plant design. It is also used, to a lesser extent, for
STAGES OF EXPLORATION & RESERVE/ RESOURCE ESTIMATION
Pitting and trenching carried out to expose the ore body if near to the surface. 3. Preliminary Exploration (E-I stage) Work is conducted over very small areas (less than a Sq.km to a few Sq.kms). Detailed mapping on 1:2,000 or 1:1,000 scale. Pitting, trenching and bed rock sampling on all out-crop sections. Drilling on systematic pattern upto 60 to 120m depth and at 100m strike interval for
SD0000029 EVALUATION OF CHROMFTE ORE AND THE
Samples of chromite ore, collected from Gam and Cheikay mining area (Ingessana Hills) in east Sudan, were analysed to assess the chromium content. Methods for extraction and analysis of chromium metal were developed and established. Analysis were carried out using atomic absorption spectroscopy (AAS) to estimate the contents of chromium, iron, calcium, and magnesium. X-ray fluorescence (XRF
FACTORS AFFECTING THE REDUCIBILITY OF SINTERED CHROMITE
The correlation between the pellet characteristics and reduction behavior was shown and its influence on industrial-scale furnaces was discus sed. Factors worth of consideration are for instance, the extent of oxida- tion during sintering, slag formation and chemistry in respect of molten state reduction, and the grain size of the chromite mineral in the raw material in respect of kinetic
Chapter 10 Mineral resources and prospectivity of the
The main chromite ore bodies are enclosed in a southwestwards-dipping transition zone between a harzburgite–dunite unit (NE footwall) and a diopside harzburgite unit (SW hanging wall). To the SW, this harzburgite is followed by spinel lherzolite and plagioclase lherzolite. The ore is always contained in a dunite envelope between 10 cm and several metres in thickness. Where thoroughly
Simultaneous oxidation of Cr(III) and extraction of Cr(VI
01/09/2019· Chromite ore processing residue (COPR) is commonly produced as the byproduct in the manufacture of chromates and dichromates by chromite-ore high-lime roasting technique . The residue that still contains a significant amount of chromium (Cr(VI)) is of severe environmental threat when discharged into the environment, due to the severe toxicity, carcinogenicity and high migration
ARTICLES CSA Global
correlation between SG or bulk density and rock chemistry, such as with relatively simple mineral assemblages such as some barite and chromite ores. Assuming that a barite ore consists of discrete barite (BaSO 4) and quartz (SiO 2) or that chromitite ore consists essentially of chromite and pyroxene minerals, it should be possible to estimate bulk density based on XRF ‘whole rock’ analyses
difference between chrome ore and chromite sand
Chromite is a derived term of chrome. As nouns the difference between chromite and chrome is that chromite is (mineral) a dark brown mineral species with the formula fecr 2 o 4 while chrome is chromium, when used to plate other metals. As a verb chrome is to plate with chrome. Chromite Ore Crushing.
Dense Medium Separation An Effective and Robust Pre
With energy costs increasing and ore grades diminishing, the role of pre-concentration in hard rock mining operations has been gaining greater interest. To maximize energy conservation, the pre-concentration process should be conducted at as coarse a crush size as possible while minimizing losses of pay metals. Dense medium separation (DMS) is a robust process that can be conducted at particle
The Platinum Group Element Deposits of the Bushveld
The chromite ore itself is also currently sub-economic for chromium. The layer thickness and chromium-to-iron ratio are the two most important parameters in evaluating the economic potential of chromite deposits, and the chromitite layers of the Bushveld Complex generally decrease in this ratio upward, and are in the range 2.0 to 1.2 ( 10 ).
Bulk Density Chart Anval
Iron Chromite 114 1826 Iron Fillings 180 2884 Iron Ore 162 2595 Iron Oxide 80 1282 Iron Oxide (Black) 161 2579 Iron Oxide (Red) 69 1105 Iron Powder 175 2804 Iron Sulphate 80 1282 Kaolin 49 785 Kaolin Clay 50 801 Latex Powder 89 1426 Lead Arsenate 90 1442 Lead Carbonate 81 1298 Lead Chloride Crystals 72 1153 Lead Oxide 63 1009 Lead Stabilizer 43 689 Ligno Sulfinate 30 481 Lignone 36 577
Mass, Weight, Density or Specific Gravity of Bulk Materials
Mass, or density, of over 80 different Bulk Materials from bauxite to zinc ore density of materials : Bulk Materials. The mass of over 300 different 'dry' materials are listed below. Liquids, metals and woods are on other pages and a site search facility is on the home page. The data is useful for the design and selection of bulk materials handling plant, bulk transport and packaging
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