The tailing sample was beneficiated by hydrocyclone, tabling, wet high-intensity magnetic separation (WHIMS), and flotation in order to recover the chromite. A chromite concentrate with 45.29wt% Cr 2 O 3 and a Cr:Fe mass ratio of 1.85 can be produced from these low-grade chromite ore beneficiation plant rejects.Web

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. ... This paper describes the results of a series of physical separation, and chromite bench flotation tests that have been carried out at acidic and …Web

This study aimed to evaluate the chromite recovery from shaking table tail-ings of Forumad plant by a dry high-intensity magnetic separation. The average feed grade of chromium xide (Cr 2 O 3 ...Web

The low-grade siliceous chromite ore from Ghutrigaon, Odisha, India, containing ~ 16% Cr2O3, with Cr/Fe ratio of 1.97 and ~ 55% of SiO2, does not find any use in metallurgical industry and hence ...Web

Chromium ore processing residue (COPR) is a hazardous waste generated during the production of chromate. Currently, approximately 10% of Cr 2 O 3 cannot be extracted after chromite sodium roasting and remains in COPR, wasting valuable Cr resources. In this study, Mg was selectively removed by using (NH 4) 2 SO 4 roasting in …Web

Grinding experiments were conducted in a laboratory-scale stirred mill on a low-grade PGE bearing chromite ore. High-Pressure Grinding Rolls (HPGR) product of −1 mm was used as feed material to ...Web

Alluvial, podiform, and stratiform deposit types are the commercially exploitable chromite ore sources [9,10,11]. Of these deposit types, stratiform-type chromite deposit ores are mainly exploited due to their large lateral continuity and regular layering . The value of chromite ore is however determined by the Cr 2 O 3 content and the Cr/Fe …Web

Gravity separation is traditionally employed depending on the liberation particle size in order to obtain a saleable chromite concentrate with at least Cr2O3 content of 44% and Cr/Fe ratio of...Web

It is found that low-grade ferruginous chromite ore can be upgraded by reduction roasting, and 61.2% Cr2O3 was recovered with a chromium-to-iron ratio of 1.93 from a feed chromium-to-iron ratio of ...Web

Chromite ore processing residue (COPR) is a by-product generated after the leaching of sodium chromate by roasting chromite ore at 1200 °C. However, the residual 1130 ... The recovery of magnesioferrite from detoxified COPR by wet magnetic separation process realizes not only the recovery and reuse of valuable metal Fe in COPR but also …Web

Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite …Web

The separation of chromite ore with lowest particle size fraction was done using Mozley mineral separator followed by the magnetic separation of the sink product by magnetic separator. The results obtained revealed about 77% of the total material containing 300 μm particle size, 52% ˂ 212 μm and 17% below 75 μm. ...Web

The gravity separation process is the main beneficiation process used to recover chromite mineral. However, these conventional chromite processing techniques become …Web

CONTRIBUTIONS TO GEOCHEMISTRY GEOLOGICAL SURVEY BULLETIN 1084-B A discussion of rapid methods of labora­ tory analysis for determining the major and some …Web

Sodium chromate is produced via the soda-ash roasting of chromite ore with sodium carbonate. After the reaction, nearly 15 pct of the chromium oxide remains unreacted and ends up in the waste ... Fe3+2-x)O4 and its magnetic separation. Yingying Lan Lijuan Zhang Xiaoqin Li Weizhen Liu Xintai Su Zhang Lin. Materials Science. The Science of …Web

RAPID ANALYSIS OF GHROMITE AND CHROME ORE By JOSEPH I. DINNIN ABSTRACT Rapid methods for the determination of the major and of some minor constitu­ 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 …Web

Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite (FeO.Cr2O3). Gravity separation techniques are very suitable for beneficiation of ...Web

This study, focused on the beneficiation of a Nigerian complex chromite ore sourced from Tunga-Kaduka, Anka Local Government of Zamfara State, Nigeria, assaying 45.85% …Web

Research work of Tevfik Agacayk et al. on low grade chromite ores of abandoned mines in Turkey (average grade 20–40% Cr 2 O 3) shows that best grades …Web

Chrome ore flotation Generally, when the gravity separation and magnetic separation fail, flotation offers an alternative technique to concentrate the fine-grained and ultra-fine-grained chromite rocks and fine-grained chromite tailings which require fine grinding for liberation. But grinding will produce a large amount of ore slime.Web

3.1 Mining and beneficiation of chromite ore Run-of-mine (ROM) chromite (mined ore, prior to beneficiation) is usually beneficiated with relatively simple processes. The most commonly applied processes include primary and secondary crushing, screening, milling, dense media separation and gravity separation methods ( Murthy et al., 2011 ).Web

Chemical-grade chromite ore generally ranged from 40 to 46 pct Cr2O3 with a chromium-to-iron ratio of 1.5:1 to 2:1. Refractory-grade chromite ores contained a minimum of 20 pct Al2O3 and more than 60 pct Al2O3 plus Cr2O3. ... The combination of tabling and magnetic separation of a 2.5-pct-Cr2O3 ore from Auburn, Calif., resulted in …Web

Alteration of crystalline structure and magnetic property of these minerals enables separation of low-grade ore by using magnetic separation. It is found that low-grade ferruginous chromite ore can be upgraded by reduction roasting, and 61.2% Cr 2 O 3 was recovered with a chromium-to-iron ratio of 1.93 from a feed chromium-to-iron ratio of …Web

The low chromium-to-iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium content. In the present study, a chromite concentrate was reprocessed by gravity (spiral concentrator) and magnetic separation to enhance the chromium-to-iron …Web

Although the intention of chromite mining is to remove chromite from the ore for the production of ferrochrome, the process is not efficient, so mining and smelting wastes including dust, wastewater, tailings, waste rock, and slag (produced during ferrochrome separation from the ore) still can contain different forms of Cr, including Cr(VI).Web

Magboul EMM (2014) Effective Processing of Low Grade Chromite Ore by Heavy Medium Separation Process. University Of Khartoum Engineering Journal, 3(2). Simulation of auto genius mill in Choghart ...Web

G. P. Gallios et al. have studied the behavior of the chromite ore and separation of chromite from serpentine by using flotation process. Experimental result indicates that sodium oleat as a ...Web

Chromite ore ore genesis effluent treatment chromite reserves mining and beneficiation 3.1. Introduction Chromium is one of the most versatile and widely used …Web

ABSTRACT Mineral and morphological characteristics of chromite ore strongly affect the separation efficiency while upgrading the low-grade deposits. Usually, chromite ore enrichment is carried out by … Expand. 31. Save. Optimizing the performance of the RER magnetic separator for upgrading silica sands. S. Ibrahim M. Farahat T. Boulos.Web

Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite (FeO.Cr2O3). Gravity separation techniques are very suitable for beneficiation of ...Web

Conventionally, the chromite ore is beneficiated by using gravity concentration techniques. With the decrease in the particle size, separation of the chromite particles by gravity separation becomes …Web

A chromite concentrate with 45.29wt% Cr2O3 and a Cr:Fe mass ratio of 1.85 can be produced from these low-grade chromite ore beneficiation plant rejects. View Show abstractWeb

Pilanesberg Platinum Mines (PPM) is a primary platinum producer on the western limb of the Bushveld Complex in South Africa, operating a typical mill-float-mill-float (MF2) flowsheet for recovery of PGMs from the UG2 ore. Chromite is usually recovered as a by-product from coarser UG2 tailings by gravity separation, involving spirals and/or ...Web

Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite (FeO.Cr2O3). Gravity separation techniques are very suitable for beneficiation of ...Web

The low chromium-to-iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium content. In the present study, a chromite concentrate was reprocessed by gravity (spiral concentrator) and magnetic separation to enhance the …Web

In this process, the low-grade chromite ore (containing 34.8% Cr 2 O 3) was reduced by carbon at 1200 °C to remove the iron-oxide phases by converting into Fe 3 O 4, followed by magnetic separation. The non-magnetic product was mixed and smelted with MgO to obtain magnesia-chromite refractory bricks ( Bayat and Vapur, 2005 ; Sahu et …Web

To establish a cleaner production technology of chromium salt, the pressurized leaching process of chromite ore in 60 wt% NaOH solution, subsequent separation of a chromium salt from the leached solution and Cr 2 O 3 preparation from the intermediate product BaCrO 4 were systematically investigated, and a new highly efficient and …Web

Chromite ore is the only commercial source of chromium in the metallurgical industries [1]. It occurs as a chromium spinel, a complex mineral containing chromium, iron, aluminium and magnesium in changeable proportions depending upon the deposit [2]. Chromite deposits can be estimated using geostatistics and geotechnical methods [3,4].Web

Numerous steps of separation using density, magnetism, and electrostatics were performed to obtain heavy mineral concentrations (Xu et al., 2009, Aitchison et al., 2022). ... Although determining chromite ore-forming process is beyond the scope of this article, the occurrence of coeval magmatic zircons in podiform chromitite could be a clue …Web