The research work of Rao et al. (1987) reveals that low-grade chromite ore of about 20%–30% Cr 2 O 3 of Sukinda region, India can be upgraded to 50% Cr 2 O 3 …
Chemical grade chromite ore, used to manufacture sodium dichromate, generally has a Cr203 content of over 44%, with a Cr:Fe ratio of about 1.5, and a silica content of less than 3.5%. Refractory grade chromite traditionally has low (30-40%) Cr203 content, with a relatively high (25-32%) AI203 content.
Also, response surface methodology has been applied for the optimization of copper leaching from refractory flotation tailings [38] and beneficiation of Sudanese chromite ore via pilot plant shaking table separator [39]. However, ANN has found little or no application in the optimization of low-grade barite beneficiation as far as authors …
Spirals, the most common equipment for the separation of heavy minerals such as chromite, are greatly affected by size distribution and the liberation degree (hence the specific gravity and size) of the feed particles. In this study, the efficiency of spirals in separation of low-grade chromite particles has been investigated by studying the …
C¸ic¸ek et al.An efficient process for the beneficiation of a low grade chromite ore Mineral Processing and Extractive Metallurgy (Trans. Inst. Min. Metall. C) 2010 VOL 119 NO 3 143 semi solid ...
Beneficiation of Low-Grade Chromite 0 10 20 30 40 50 60 70 80 90 100 10 1000 100000 Cumulative weight (%) Particle size (μ) Fig. 1. Cumulative weight (%) as a function of particle size (μ), after intermediate crushing of chromite ore. 87. ding better grades with higher recoveries, made the whole
Pre-oxidation of the as-received chromite ore (<1 mm) was performed in a Lenton Elite model BRF15/5 chamber furnace fitted with a programmable temperature controller. 100 g of the metallurgical grade chromite ore was placed in a CoorsTek Inc. AD-998 ceramic (99.8% Al 2 O 3) 340 mL rectangular tray, positioned centrally inside the …
Magnetic separation techniques may be useful after reduction for the beneficiation of low grade chromite ore. The sample collected from the sukinda mines is characterized by XRD which shows predominant phases like maghemite, chromite, silica, magnesia and alumina. The raw ore is crushed and ground to below 75 micrometer size.
This review assesses all chromite beneficiation methods, along with a detailed examination of spiral concentrators, which is used as a conventional method for chromite processing. The significance of processing low-grade and fine chromite is …
mines are already exploiting other chromite layers within the Middle group, and these are the MG2, 3 and 4 [6]. This might be due to depreciation of high-grade chromite seams. Chromite processing involves crushing, milling to less than 1mm and further beneficiation using gravity circuits and spiral concentrators are widely used for this purpose.
Process mineralogy of low-grade laterite nickel ore in Indonesia was systematically characterized and the beneficiation process of mineral components such as limonite, serpentine and chromite was studied on the basis of process mineralogy. The results show that the low-grade laterite nickel ore is a typical weathering sedimentary metamorphic …
Chromite (Cr) occurs exclusively in mafic and ultramafic igneous rocks (Papp and Lipin, 2006).Although some Cr-based minerals such as crocoite (PbCrO 4), vauquelinite (Pb 2 Cu[CrO 4][PO 4]), uvarovite (Ca 3 Cr 2 [SiO 4] 3), and merumite (4(Cr,Al) 2 O 3 ·3H 2 O) are well known, chromite (FeCr 2 O 4) is the only one that is a …
Keywords: chromite, beneficiation, spiral concentrator, teetered bed separator 1. Introduction The beneficiation of chromite (Burt 1984; 1999) and processing of its low-grade ores (Ağaçayak, 2004; Amer and İbrahim, 1996; Sönmez and Turgut, 1998) are traditionally performed using gravity concentration methods.
Beneficiation of chromite ore using selective chlorination was successfully employed to improve the low grade ore in South Africa. The Cr:Fe ratio attained, using this approach was 20:1 [9] 2.3 Magnetic Separation Technique Magnetic separation process exploits the difference in magnetic properties between the ore minerals and is employed to ...
The present study shows that this low-grade chromite ore can be upgraded through physical beneficiation (tabling and WHIMS) techniques. However, it can be …
Low-grade deposits and the fines resulting in the mining operations cannot be economically used. Therefore, beneficiation of low grade and finely disseminated chromite ores is becoming important, due to the shortage of high grade ore reserves [1,2]. High grade chromite ore commonly was mined from Ingassana hills deposits in the Blue Nile region.
processing of low grade Sudanese chromite using a laboratory shaking table separator and dense media separation [3, 22] . This investigated study aims for modeling and optimization of parameters process via Central Composite Design on beneficiation of massive low-grade Sudanese chromite by using pilot plant shaking table as the …
Abstract: In this study, an optimum beneficiation route was developed for an existing concentrator that processes low-grade chromite deposits. This objective is challenging …
In a novel method of beneficiation of low-grade chromite ore, nuggets, 25 mm in diameter and 10 mm long, made of chromite ore and coke fines, are subjected to partial reduction. A significant ...
Keywords: beneficiation, cationic flotation, disodium n-octadecyl sulfosuccinamate, chromite ore, Pakistan chromite, low-grade chromite Table 1. Average chemical analysis of the Muslim Bagh, Balochistan, Pakistan low-grade chromite ore Constituents Percentage Cr 2 O 3 38.06 Fe 2 O 3 13.80 SiO 2 20.02 Al 2 O 3 10.50 MgO 14.40 LOI …
low and sub-grade ore (10-38% Cr203). Beneficiation is mostly limited to size reduction, desliming and classification. The yield is low of about 25-35%. During beneficiation, sub grade intermediate products of about 35-40% Cr203 get generated which finds very little or no use and these have been accumulating in the mines.
Beneficiation of a low grade chromite ores is an essential step towards optimum utilization of natural resources. Some of the old practices like hand-picking, size reduction and screening are still in use to upgrade and prepare chromite ore for use in the industry. During mining, ferruginous and siliceous chromite ore fines are created as ...
During beneficiation of low-grade chromite ore, huge amount of ultrafine tailings are generated and contain substantial metal values which needs to be recovered. Selective flocculation technique ...
The reactions of (Fe,Mg)(Cr,Al,Fe) 2 O 4 constituents, for both chromite concentrates (low grade chromite concentrate-LGChC and high grade chromite concentrate-HGChC) with chlorine in isothermal conditions proceeded by gradual scheme starting by the reaction of iron oxides (Fe 3 O 4) followed by interaction of iron chromite (FeCr 2 O 4).
3.1. Physico-Chemical Characterization of Chromite Concentrate Samples. The chemical composition in the five main constituents of the first chromite sample is given in Figure 3.As shown, this concentrate is characterized by a high iron content (26.9% wt expressed as FeO) and its chromium-to-iron ratio of 1.48 makes it unsuitable for the FeCr manufacturing.
The beneficiation studies of Suresh et al. (1981), concludes that low grade chromite ore of 16–25% Cr2O3, 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.
The beneficiation studies of low-grade chromite ore from Ghutrigaon reveals that it can be upgraded through physical beneficiation methods. Following gravity concentration technique, a feed of 16% Cr 2 O 3 can be upgraded to 40.1%, with 23% yield, 58% recovery and Cr/Fe ratio of 3.35.
BENEFICIATION OF LANDI RAUD (MALAKAND, NWFP) CHROMITE ORE A. Hafeez, Saqib Ahmad and K. Hussain PCSIR Laboratories, Lahore-54600 (Received May 29, 1988; revised September 7, 1988) Low grade chromite ore from Landhi Raud in the assay range of 27-28 % Cr, 03 has been upgraded
The beneficiation of low-grade iron ores is a key research and development topic in the mineral processing industry. The gradual exhaustion of high-grade iron ore reserves, and rising consumer iron and steel demand globally necessitate efficient low-quality iron ore beneficiation to meet steelmaking quality requirements. This …
recovery of chromium from lower-grade ores are receiving more attention. With present technology, most of the low-grade ores cannot compete with the higher grades. An estimate of the world's lower-grade chromite ores is given in Table I, which was derived from surface geology and information on reserves, and indicates only orders
In this study, an optimum beneficiation route was developed for an existing concentrator that processes low-grade chromite deposits. This objective is challenging as the grade of the ore under consideration is …
Low-grade chromite of Muslim Bagh, Balochistan, Pakisktan was beneficiated to produce chromite concentrate by cationic flotation using disodium n-octadecyl sulfosuccinamate as collector.
