Hydrometallurgy Of Chromite Ore

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. Many of the strategic minerals are inputs into products in fast-changing markets. ... Hydrometallurgy, Volume 165, Part 1, 2016, pp. 213-226.

Hydrometallurgical processing of low grade chromite (Barramiya, Egypt) is attained through leaching with sodium hydroxide of mechanically activated chromite ores under relatively high temperature (240‡C) in the presence of oxygen pressure (10 bar). The effects of temperature, grinding time, leaching time and oxygen partial pressure on chromium extraction were studied. …

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 ...

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) …

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.

For this reason, in this article a novel approach, based on alkali roasting at moderately high temperatures followed by leaching at low temperatures has been investigated for the treatment …

Chromite or chrome iron ore is FeCr 2 O 4 Its actual composition is FeO.Cr 2 O 3.. In FeO, oxidation state of Fe is calculated as: x + (−2) = 0. x = + 2. Similarly, in Cr 2 O 3 the oxidation state of Cr is calculated as. 2 × x + (−2) × 3 = 0

Roasting of ore at 400 °C had been reported to convert goethite (FeOOH) into hematite (Fe 2 O 3) in order to release nickel from the goethite matrix. (Sukla and Das, 1987). Hence, nickel ore was heated to 400 °C for 5 h. The chemical analysis of the chromite overburden and the roasted overburden is shown in Table 1.

In this study, sodium and potassium hydroxides are used as alkali for roasting of chromite ores and ilmenite mineral concentrates. The thermodynamic analysis of the roasting process is …

Applying the optimal conditions of 180 °C temperature, an initial KOH-to-ore mass ratio of 4:1, a stirring speed of 700 rpm, oxygen flow at 1 L/min, and a reaction time of 5 h, V and Cr extraction rates reach 95% and 90%, …

Comparative study of alkali roasting and leaching of chromite ores and titaniferous minerals. Yotamu Hara. 2015, Hydrometallurgy. See Full PDF Download PDF.

Hydrometallurgy. Volume 139, July 2013, Pages 46-53. An investigation on the kinetics of chromium dissolution from Philippine chromite ore at high oxygen pressure in KOH sub-molten salt solution. Author links open overlay panel Gang Chen a b c, Jiajun Wang d, Wang Xiaohui a b, Shi-Li Zheng a b, Hao Du a b, Yi Zhang a b.

The original "Panton process'' was developed for the high-chromite Panton Sill ore in EP T oxidized mineralisation which was problematic as the deposit size and remoteness could not justify the erection of a smelter, and the high chromite content of the flotation concentrates made it difficult to secure an offtake agreement with existing ...

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 with alkali and CaO …

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) aqueous solution.The …

The natural mineral chromite is widely utilized by high-lime roasting technique to obtain chromate products due to the needs of leather, catalysis, metallurgy and other industries, in which a large amount of chromite ore processing residue (COPR) is produced (Dermatas et al., 2006; He and Traina, 2005).A small percentage of Cr(VI) in COPR has high mobility, high …

Therefore, a cleaner and shorter technical route from chromite ore to Cr 2 O 3 can be designed by the integration of pressure oxidative leaching of chromite ore, ... Hydrometallurgy, 142 (2014), pp. 47-55, 10.1016/j.hydromet.2013.10.016. View PDF View article Google Scholar.

A new green metallurgical process for chromite ore has been proposed and developed to solve the serious environmental problem in the traditional production process of …

A new green metallurgical process for chromite ore has been proposed and developed to solve the serious environmental problem in the traditional production process of chromate. In the new process, the oxidation of chromite ore is carried out in sub-molten potassium hydroxide at 300 °C. Compared with the traditional roasting process in a rotary kiln at 1200 °C, …

A new leaching process for preparing chromium oxide from chromite was studied for this paper, using Cr(VI) extracted from the remediation treatment of chromite ore processing residue (COPR) as an ...

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 0.78% Ni, 0.09% Co, 42.7% Fe, 0.62% ...

In hydrometallurgy, fusion techniques are considered key in the processing of chromite ore. Salts containing easily ionized elements are often used as flux, ... The metallurgical-grade chromite ore sample was obtained from a PGE processing plant in Rusten-burg South Africa, situated on the Western limb of the Bushveld complex. The ore ...

Consequently, a complete cleaner and shorter preparation route from chromite ore to Cr 2 O 3 was achieved by integrating three processes: the pressure oxidative leaching of …

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 chromite using sodium …

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 …

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 View in Scopus ...

In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50 wt% KOH solution was studied for the first time and the results were presented in this manuscript.It was found out that the chromium extraction rate increased significantly with the increase of temperature and oxygen partial pressure, and the …

The present research focuses on orthophosphoric acid leaching to recover nickel and cobalt from a chromite overburden ore selectively. The study was carried out by varying …

comparative studies of chromite ore and titaniferous minerals is that often small concentrations of chromium oxide (0.1 to 0.5 wt.%) are ... 2 S. Parirenyatwa et al. / Hydrometallurgy xxx (2015 ...

Leaching of a low grade Egyptian chromite ore ... KANUNGO S.B., JENA P.K., 1988, Reduction leaching of manganese nodules of Indian Ocean in dilute hydrochloric acid hydrometallurgy, 21 (1), 41–58. MAGRITZ M., BRENNER I.B., 1972, The geochemistry of a lenticular manganese ore deposits (Um– Bogma, Southern Sinai) Miner–Deposita, 14, 1–13 ...