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. ... Hydrometallurgy, 43 (1–3) (1996), pp. 307-316. View in Scopus Google Scholar. Atak, 1982. S. Atak. Beneficiation of chromite by flotation. Doga, 6 …
The present research focuses on orthophosphoric acid leaching to recover nickel and cobalt from a chromite overburden ore selectively. The study was carried out …
This chapter contains sections titled: Introduction. Crystal Structure of Chromite Minerals. Thermal Decomposition of Chromites. Alkali Roasting of …
The present article reviews the insight into the available hydrometallurgical approaches for treating laterite ores and the separation of nickel and cobalt from …
on the MA eect on the alkali leaching of chromite ore. Their study shows that 97% recovery ratio was achieved when the chromium ore was mechanically activated, but ... application in hydrometallurgy is a function of the prudent choice of the mill in respect of its mechanisms and the given
Efficient and low-cost recovery of metals from pyrolusite and Chromite Ore Processing Residue (COPR) is of great significance for environmental protection and sustainable development of metal resources. ... which is an uneconomical and environmentally unfriendly method. Compared with pyrometallurgy, hydrometallurgy is …
Chromium is mainly used for the production of stainless steel, in electroplating, as pigments and in leather and refractory industries. The natural resource of chromium is the chromite ore, which is a spinel (Fe 2+, Mg)[Cr,Al,Fe 3+] 2 O 4, and is often present with gangue minerals such silicates.Traditionally chromium chemical extraction has been carried out …
The overburden (in the present case, it is the overburden of chromite mines) is nothing but the soil and dust removed in order to access an ore or mineral body. The huge amount of overburden (nearly 8–10 times that of the ore) that is generated during chromite mining and dumped nearby has found a very little use so far.
@article{Mu2023PreparationOC, title={Preparation of chromium oxide by hydrothermal reduction of sodium chromate aqueous solution with hydrogen and application to chromite ore processing}, author={Panpan Mu and Hongling Zhang and De'an Pan and Shuting Liang and Taiping Lou and Hongbin Xu}, journal={Hydrometallurgy}, …
In hydrometallurgy, fusion techniques are considered key in the processing of chromite ore. Salts containing easily ionized elements are often used as flux, which results in solutions with complicated matrices. A matrix correction approach was developed to remove sodium and phosphate ions from a solution obtained from the fusion of …
The compositions of chromite ore and residues were analyzed by ICP-OES (PE Optima 5300DV, PerkinElmer). The mineralogical phases of chromite ore and residues were examined with X-ray diffraction (XRD, Phillips PW223/30). The SEM–EDS images of the chromite ore and the residues were obtained with SEM (JSM-7001F + …
Hydrometallurgy. Volume 178, June 2018, Pages 88-96. A conceptual hybrid process flowsheet for platinum group metals (PGMs) recovery from a chromite-rich Cu-Ni PGM bearing ore in oxidized mineralization through a single-stage leach and adsorption onto ion exchange resin. Author links open overlay panel Cleophace Ngoie Mpinga, ...
Table 1 shows that the oxidized PGM ore contains more sperrylite (PtAs 2) and cooperite ((Pt,Pd,Ni)S) grains, and significantly lower (Pt,Pd)-bismuthotellurides grains compared with the pristine PGM ore sample, showing evidence of alteration. Also, the high contents, in oxidized PGM ores, of naturally floating alteration minerals such as talc, …
Chromite deposits are mined by both underground and surface techniques. Much of the ore is rich enough to be used directly: for production of ferrochromium, a rich, lumpy ore containing more than 46 percent Cr 2 O 3 and having a chromium-iron ratio greater than 2:1 is preferred, but ores with a lower ratio and as little as 40 percent Cr 2 O 3 ...
A novel process for leaching chromite ore has been proposed. Compared to the traditional alkaline roasting process, the new hydrometallurgical process lowers effectively the reaction temperature and enhances the leaching efficiency through pressure oxidative leaching with pure oxygen (O 2) in concentrated sodium hydroxide (NaOH) …
A conceptual route to the integrated processing of a Ni-Cu-PGM bearing chromite ore in oxidized mineralization for the recovery of base and precious metals is presented based upon earlier work of the authors and recent research on metal recovery from solution. ... Hydrometallurgy, 139 (2013), pp. 132-148. View PDF View article …
In hydrometallurgy, fusion techniques are considered key in the processing of chromite ore. Salts containing easily ionized elements are often used as flux, which results in solutions with ...
In this process, the extraction of chromium is achieved via roasting the mineral with alkali salts (usually sodium carbonate). Chromite ore and sodium carbonate are …
The sulfuric acid leaching process is regarded as a promising, cleaner method to prepare trivalent chromium products from chromite; however, the decomposition mechanism of the ore is poorly understood. In this work, binary spinels of Mg–Al, Mg–Fe, and Mg–Cr in the powdered and lump states were synthesized and used as raw …
Further optimisation of the roasting chemistry is necessary in order to avoid unreacted ilmenite and maximise the final TiO2 yield. 3.4. Processing of chromite ore by alkali roasting and water leaching Chromite ore was roasted with excess NaOH or KOH in air atmosphere at three different temperatures, 400 °C, 700 °C and 1000 °C.
In hydrometallurgy, metals are separated via the formation of metal complexes. ... A commercially important ore of chromium is chromite (FeCr 2 O 4), which is an analogue of magnetite (Fe 3 O 4). Based on what you know about the oxidation states of iron in magnetite, predict the oxidation states of the metal ions in chromite.
Consequently, a complete cleaner and shorter preparation route from chromite ore to Cr 2 O 3 was achieved by integrating three processes: the pressure …
The production of chromate from the roasted chromite produces millions tons of Chromite Ore Processing Residue (COPR) annually [1], [14]. ... which is an uneconomical and environmentally unfriendly method. Compared with pyrometallurgy, hydrometallurgy is characterized by low energy consumption, no GHGs production, …
Chromite tailings ore sample was obtained from a MG chromite processing plant in the Western Limb of the Bushveld Igneous Complex (BIC), South Africa. Characterisation studies were carried out to quantify the different mineral phases, their liberation and association with each other [7]. Chemical composition of different sizes of the feed ...
Chromite ore processing residue (COPR) and copper slag (CS) are industrial waste slags that cause environmental pollution and require effective treatment. This study proposes a new strategy for the co-treatment and resource utilization of COPR and CS. Under the optimal conditions (liquid-solid ratio of 9.99; H 2 SO 4 concentration of 0.85 …
In this paper, low-grade limonitic nickel laterite and chromite were synergistically utilized via the hybrid sintering process (i.e., pellet-sintering process) for high-quality Ni–Cr sinter preparation and great carbon emission reduction. Under the optimum process conditions, Ni–Cr sinter indices were substantially improved in the pellet …
The term "chromite" refers to chromium-containing spinels, with a composition of AO·B 2 O 3, where the divalent cation A can be Fe 2+ or Mg 2+, and the trivalent cation B can be Fe 3+, Cr 3+, or Al 3+ . Chromite spinel (FeCr 2 O 4) is the main mineral phase of the chromite ore .
Ore sample. Chromite overburden (COB) consisting of low-grade oxidic nickel laterites obtained from Odisha Mining Corporation (OMC), India was used in the present study. The ore sample was ground to a particle size of ~ 75 μm prior to bio-reduction experiments. Chemical analysis of the sample indicated the presence of …
Hydrometallurgical processing of low grade chromite (Barramiya, Egypt) is attained through leaching with sodium hydroxide of mechanically activated chromite …
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 …