An efficient process for the beneficiation of a low grade chromite ore

This study is concerned with the processing of low grade chromite ores, Ingassena Hills by froth flotation techniques. For this purpose, representative samples were taken from four different mines. Mineralogical examinations indicated that, the major minerals are chromite and serpentine .Olivine, iron oxides and talc have been identified as minor minerals. Adequate degree of liberation of chromite was obtained by grinding the ore to minus 177µm. Froth flotation was used to upgrade that particular chromite ore. Oleic acid was used as collector. Several operating parameters influencing the floatability of both high grade chromite and serpentine were investigated. These include the concentrations of the collector and depressant, pulp pH and conditioning time. From an ore feed grading 20.27% Cr2O3, a chromite concentrate of 28.71% Cr2O3 with recovery of 94.54 % could be obtained by flotation at collector dosage of 0.300 kg /t , neutral pulp (pH 9) ,conditioning time ,2min ,and pulp density, 20%.

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Kinetic Studies on the Reduction of Iron Oxides in Low-Grade Chromite Ore by Coke Fines for Its Beneficiation

Arabian Journal for Science and Engineering ◽

10.1007/s13369-018-3324-x ◽

2018 ◽

Vol 43 (11) ◽

pp. 6143-6154 ◽

Cited By ~ 1

Author(s):

Prithviraj Gupta ◽

Amit Kumar Bhandary ◽

Mahua Ghosh Chaudhuri ◽

Siddhartha Mukherjee ◽

Rajib Dey

Keyword(s):

Iron Oxides ◽

Kinetic Studies ◽

Low Grade ◽

Chromite Ore ◽

Reduction Of Iron ◽

Coke Fines

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Synthesis of chromium and ferrochromium alloy in molten salts by the electro-reduction method

Journal of Mining and Metallurgy Section B Metallurgy ◽

10.2298/jmmb141222022g ◽

2015 ◽

Vol 51 (2) ◽

pp. 185-191 ◽

Cited By ~ 3

Author(s):

X. Ge ◽

S. Jin ◽

M. Zhang ◽

X. Wang ◽

S. Seetharaman

Keyword(s):

Chromium Oxide ◽

Steel Slag ◽

Reduction Process ◽

Advanced Characterization ◽

Low Grade ◽

Oxide Mixture ◽

Stainless Steel Slag ◽

Chromite Ore ◽

First Time ◽

Sintered Temperature

In this work, we successfully applied the Fray-Farthing-Chen Cambridge electro-reduction process on the preparation of chromium from chromium oxide, and for the first time, the synthesis of ferrochromium alloy from chromium oxide and iron oxide mixture and the chromite ore in molten calcium chloride. The present work systematically investigated the influences of sintered temperature of the solid precursor, electrochemical potential, electrolysis temperature and time on the products by using a set of advanced characterization techniques, including XRD and SEM/EDS analyses. In particular, our results show that this process is energy-friendly and technically-feasible for the direct extraction of ferrochromium alloy from chromite ore. Our findings thus provide useful insights for designing a novel green process to produce ferrochromium alloy from low-grade chromite ore or stainless steel slag.

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Leaching of a low grade Egyptian chromite ore

Hydrometallurgy ◽

10.1016/0304-386x(96)00005-9 ◽

1996 ◽

Vol 43 (1-3) ◽

pp. 307-316 ◽

Cited By ~ 18

Author(s):

A.M. Amer ◽

I.A. Ibrahim

Keyword(s):

Low Grade ◽

Chromite Ore

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Holocene Boulder Beach Eroded from Chromite and Dunite Sea Cliffs at Støypet on Leka Island (Northern Norway)

Journal of Marine Science and Engineering ◽

10.3390/jmse8090644 ◽

2020 ◽

Vol 8 (9) ◽

pp. 644

Author(s):

Markes E. Johnson

Keyword(s):

High Latitude ◽

Land Surface ◽

Igneous Rocks ◽

Low Grade ◽

Northern Norway ◽

Chromite Ore ◽

Tectonic Events ◽

Wave Heights ◽

Wave Erosion ◽

Sea Cliffs

This project examines the role of high-latitude storms degrading a Holocene coast formed by igneous rocks composed of low-grade chromite ore and dunite that originated within the Earth’s crust near the upper mantle. Such rocks are dense and rarely exposed at the surface by tectonic events in the reconfiguration of old ocean basins. An unconsolidated boulder beach occupies Støypet valley on Leka Island in northern Norway, formerly an open channel 10,000 years ago when glacial ice was in retreat and rebound of the land surface was about to commence. Sea cliffs exposing a stratiform ore body dissected by fractures was subject to wave erosion that shed large cobbles and small boulders into the channel. Competing mathematical equations are applied to estimate the height of storm waves impacting the channel floor and cliffs, and the results are compared with observations on wave heights generated by recent storms striking the Norwegian coast with the intensity of an orkan (Norwegian for hurricane). Lateral size variations in beach clasts suggest that Holocene storms struck Leka Island from the southwest with wave heights between 5 and 7.5 m based on the largest beach boulders. This result compares favorably with recent high-latitude storm tracks in the Norwegian Sea and their recorded wave heights. The density of low-grade chromite ore (3.32 g/cm3) sampled from the beach deposit exceeds that of rocks like limestone or other igneous rocks such as rhyolite, andesite, and basalt taken into consideration regarding coastal boulder deposits associated with classic hurricanes in more tropical settings.

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