(PDF) Flotation of chromite and serpentine
In this paper, the floatability of chromite and serpentine fine particles by sodium oleate was investigated in-depth, aiming to separation during mineral processing, i.e. to float chromite...
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The Characterisation of a Two Stage Flotation Circuit …
7 .1 Conventional mechanical flotation cells 1.2. 7 .2 Mechanical flotation machine design 1.2. 7 .3 Column flotation cell 1. 2. 7 .4 Column flotation cell design 1.2. 7 .5 Flotation machine selection 1.2.8 Flotation circuits L~.8.1 Circuit layout and design 1.2.8.2 Circuit control variables 1.2.8.3 Flotation circuit treating UG-2 ore
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(PDF) Chromite Ore Mining and Associated Factors in the …
Three-fourths (76.5%) were extracting chromite ore through partnerships, 45.1% of them had four partners. The leased area extended from less than 1 acre to 875 acres. All mines were located in the ...
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Chromite Flotation
Hallimond tube flotation studies on chromite ore gangue minerals were performed. The particular minerals studied were olivine, diopside and hedenbergite. The initial flotation conditions are indicated in Table VII. Under such conditions, although less than expected, olivine flotation was satisfactory. However, the maximum flotation recovery ...
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Acidic medium flotation separation of chromite from …
The original flotation method that is now in general use was developed by Havens (1946). This involves flotation of the deslimed ore at a pH of 1.5 to 5.5 using a long-chain fatty-acidcollector. …
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OneMine | RI 8502 Amine Flotation of Chromite Ores From …
The Bureau of Mines, U.S. Department of the Interior, devised a flotation technique for upgrading chromite in chromium ores and gravity concentrates. The technique consisted of cationic …
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Experiences in the production of metallurgical and chemical …
SYNOPSIS. Recovery of a chromite concentrate from UG2 flotation tailings streams, of a grade suitable for further pyrometallurgical treatment for the production of ferrochrome, has certain specific challenges not only by virtue of the decoupled nature of the primary PGM recovery process and secondary gravity based chromite recovery circuits, but also because of intrinsic …
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Enrichment of a Nigerian chromite ore for …
chromite ore initially analyzed to contain silicate impurities was found not suitable for metallurgical purposes. Thus, enrichment was examined through gravity separation studies using organic ...
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CHROMITE DEPOSITS OF PAKISTAN: A SHORT REVIEW
Arc involves a 10x4 km slab of chromite-bearing pyroxenite, dunite, and peridotite [6] in layered form. These rocks are formed by the high-temperature and pressure fractional crystallization. The documented SDA estimates of ore reserves are 0.6mt with 40-50% of Cr2O3 and 12-18% of Fe2O3, while the Cr: Fe ranges from 2.8:1 to 3.6:1 [1].
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Chrome ore beneficiation challenges & opportunities – A …
Around 90% of mined chromite ore is converted into different grades of ferrochrome by the metallurgical industry. Stainless steel industry consumes about 80% of ferrochrome produced (mainly high-carbon/charge grade). Chromite varies widely in composition according to the chemical formula (Mg, Fe +2) (Cr, Al, Fe +3) 2 O 4. Chromium occurs as ...
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Recover Chromite by Flotation
Flotation can be used to recover chromite from many fine-grained disseminated ore types without prior desliming of the ground pulp. Of the seven samples tested, all but the …
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Flotation of chromite and serpentine
Keywords: Chromite; Flotation; Modifier; Separation; Serpentine 1. Introduction The world supply and reserves of chromite or chrome ore (FeCr2O4) have been dominated mainly by South Africa and
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FLOTATION BEHAVIOR OF SUDANESE CHROMITE ORES
Adequate degree of liberation of chromitewas obtained by grinding the ore to minus 180μm.Froth flotation was used to upgrade this chromite ore. ... Theseinclude the collector and depressant dosages, pulp pH, and conditioningtime. From an ore feed grading 20.27% Cr2O3, a chromite concentrateof 28.71% Cr2O3 with recovery of 94.54 % could be ...
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New perspectives in iron ore flotation: Use of collector …
In conventional operations of iron ore beneficiation by flotation, the flotation feed is deslimed to remove the 10 µm fraction prior to flotation (Filippov et al 2014), thus the unselective flocculation effect of starch does not affect the flotation selectivity. Contrary to what occurred in this study, where the pure mineral samples used for ...
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US2469422A
a selective froth flotation process for the treatment of chromite ores having low grade chrome spinels, Zircon, staurolite, ilmenite, magnetite, garnet, quartz, epidote, olivine and alteration products as inclusions which comprises subjecting a pulp of such an ore to an initial blunging treatment in the presence of a soluble fluosilicate-forming substance, partially neutralizng the …
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A study on the recovery of fine chromite from UG2 tailings
Subsequent flotation tests at natural pH on hot tailings samples with two stages of cleaning showed good upgrading, where a feed grade of 16.1 % Cr 2 O 3 after desliming was converted to a concentrate of 29.4 % Cr 2 O 3 at a yield, based on deslimed feed, of 28.6 % and a recovery of 52.4 %. The overall upgrade ratio in this case of 1.83 was slightly lower than those …
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The flotation of South African chromite ores in acidic media
In the UG2 ore (Bushveld Complex, South Africa) flotation, normally more than 3% of the gangue minerals, principally chromite with talc and pyroxene, report to the concentrate diluting the PGM ...
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Amine flotation of chromite from acidic pulps
The forth flotation, chromite ore recovery process of the present invention can be employed for the recovery of chromium values from any grade of chromite bearing ore. However, the method of the invention is particularly useful in recovering chromite from such low-grade chromite ore as those found in the Stillwater Complex in Montana, USA.
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(PDF) PGM recovery from chromite tailings
The rougher flotation kinetics of the tw o ore bodies also differ slightly with the LG or es showing a much faster and higher rougher recovery compared to MG ores. Figure3: Rate kinetics for ...
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Selective Flocculation of Chromite Tailings | Transactions of …
Selective flocculation process can be one alternative method for upgrading the ultrafine chromite (< 37 µm). Mineralogical analysis reveals that ultrafine chromite tailing (< 37 …
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Flotation of Chromite
The literature suggests the research effort to characterise the general flotation properties of chromite (chrome spinel with high chromium content) has been extensive and a substantial amount of data is available. However, the problem of separating a small amount of chrome spinel from a large amount of ilmenite requires a different approach to ...
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THE FLOTATION OF SOUTH AFRICAN CHROMITE ORES IN …
Chromite is an important strategic mineral usually associated with other gangue minerals, mainly silicates. The selective flotation of chromite minerals of any chromite ore have some difficulties due to dissolved cations from gangue minerals. By this work, selective flotation of various chromite ores were studied to determine some of the features of flotation. Different chromite …
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Studies on flocculation characteristics of chromite's ore …
As a result, chromite concentrated ore is obtained, and roughly 50% to 70% of the chromite losses are in the fine fractions (tailings), where the fraction below 75 µm contains about 9-20% Cr 2 O ...
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Chrome ore beneficiation challenges & opportunities – A …
The beneficiation studies of Suresh et al. (1981), concludes that low grade chromite ore of 16–25% Cr 2 O 3, of Sitampundi area of India, cannot be upgraded by using tabling and flotation techniques, to meet the metallurgical grade due to the intimate association of iron in the lattice of chromite.
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On the Flotation of a Low Grade Chromite Ore
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 ...
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Flotation of Chromite Ore
Rougher flotation of ore containing abundant olivine upgraded the chromite from 23.4 to 29.6 percent Cr2O3 at a recovery of 89.4 percent. The technique was also applied to …
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An Investigation Into The Role Of The Froth Phase In The Flotation …
The control of the amount of chromite reporting to the concentrate during the flotation of UG2 ore is of critical importance since its presence affects the downstream smelting process. It is generally reported that the main mechanism responsible for chromite recovery is through entrainment. This is reflected in analyzing the solids and water recoveries. These in …
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Chrome ore beneficiation challenges & …
Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by strong demand for ferrochrome used in ferroalloy production for making stainless steel.
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Surface chemical mechanisms of inadvertent recovery of chromite …
In the UG2 ore (Bushveld Complex, South Africa) flotation, normally more than 3% of the gangue minerals, principally chromite with talc and pyroxene, report to the concentrate diluting the PGM recovery and contributing to subsequent processing costs.Previous studies have identified residual talc-like layers on orthopyroxene surfaces in Merensky ore flotation …
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GitHub
Cromite's goal is to. limit the features built into the browser that can be used as a platform for tracking users' habits, and, if it is not technically possible, disable them and leave it up to the user to choose whether to re-enable them
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