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Selective nitridation–corrosion process to recover vanadium, …

Preparation of ferrochromium nitride via reduction and nitridation of chromite spinel with Ammonia Gas. Powder Technol., 386 (2021), pp. 449-456, 10.1016/j.powtec.2021.03.064. ... Selective chlorinated extraction of iron and manganese from vanadium slag and their application to hydrothermal synthesis of MnFe 2 O 4. ACS …

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Extraction of Cr (VI) from chromite ore processing residue

The effective extracting Cr(VI) from chromite ore processing residue (COPR) is the key to achieve COPR detoxification and recovery. We developed an effective method to extract Cr(VI) from COPR via controlling the phase transformation of Cr(VI)-containing minerals. Characteristic analysis showed that Cr(VI) was mainly incorporated in the …

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Kinetics of selective removal of iron from chromite by

Iron from chromite ores can be selectively removed by carbochlorination in order to increase the molar ratio of Cr to Fe in chromites. The removal efficiency of iron from chromite was found to be significantly increased by adding some salts such as sodium chloride or potassium chloride to the chromite before carbochlorination. This finding has …

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Selective extraction of vanadium from chromium by pure …

Hu et al. studied the selective extraction of vanadium from chromium by hydrophobic imidazole ionic liquids, and the mechanism of V (V) extraction by [C 8 mim][PF 6 ] was proven to be an anion ...

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Selective reduction of chromite fines by microwave …

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.

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A study on the recovery of fine chromite from UG2 tailings

Selective flotation of chromite from serpentine was possible with sodium oleate and FSA or EDTA as modifiers under conditions of neutral pH. Other flotation studies have focused on a variety of technologies that are suitable for the selective recovery of fine chromite, including mechanical, column, and free jet flotation. ...

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Use of chlorination for chromite upgrading

The chromite concentrate was treated using a gas mixture of chlorine and nitrogen having a Cl 2 /N 2 ratio equal to 1. ... In this work, a cleaner and effective method for selective extraction of iron from vanadium slag was developed, including carbothermal reduction of iron from vanadium slag, chlorination of reduced slag, and electrolysis of ...

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Selective extraction and deep separation of V(V) and Cr(VI) …

The solvent extraction of V(V) from leaching solution by primary amine N1923 for the recovery of the secondary resource, i.e., vanadium-bearing chromium slag, has been successfully used in ...

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Selective extraction of lithium from alkaline brine using …

The extraction efficiencies of this extraction system were measured as a function of various extraction parameters, including pH value of aqueous phase, extraction temperature, and composition of organic phase. The extraction complex was determined by slope analysis method, which indicated that HBTA, TOPO and lithium …

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Mineral processing: leaching process of chromium and …

The current strategy reports the recovery of precious group metals (PGMs) from Na2CO3 roast of Saudi Arabian ophiolitic chromite ore at 1160 °C under …

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Effect of sodium chloride on the selective removal of iron from

Kanarl et al. (1999) studied the carbochlorination of chromite concentrate by using Cl 2 + CO and found that over 60% of iron could be extracted at 600 °C after 2 h, with an extraction percentage of chromium less than 5%. As a result, the Cr/Fe ratio doubled from the initial value of 3.2.

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Selective removal of chromium from laterite residue with …

The extraction process could be managed in two steps to recycle iron and capture chromium. Over 80 % of iron could be successfully recycled, with chromium loss in the …

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Effect of sodium chloride on the selective removal of iron …

Kanarl et al. (1999) studied the carbochlorination of chromite concentrate by using Cl 2 + CO and found that over 60% of iron could be extracted at 600 °C after 2 h, with an extraction percentage of chromium less than 5%. As a result, the Cr/Fe ratio doubled from the initial value of 3.2.

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Selective extraction of chromium from chromium-bearing …

The selective extraction of chromium (Cr) from Chromium-bearing electroplating sludge (CES) has positive significance for harmless disposal and reducing dependence on …

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Five Chrome Extraction Process to Teach you the Chromite …

Of course, the specific chrome extraction process should be determined comprehensively according to the nature of the chrome ore, the actual situation of the chromite ore processing plant, the ...

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Selective Extraction of Transition Metals from Spent …

Here, we propose a novel strategy for selective extraction of nickel, cobalt, and manganese from spent LiNi x Co y Mn 1−x−y O 2 (NCM) cathode through the regulation of coordination environment.

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SELECTIVE EXTRACTION OF METALS FROM COMPLEX …

The principles of selective reduction and extraction of iron from lean and complex ores without melting have been developed. The iron is reduced directly inside the lattice of complex oxides at a ...

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Selective extraction and separation of REEs from NdFeB …

An approach of co-chlorination followed by water leaching to achieve the selective extraction of rare earth elements (REEs) from NdFeB magnets scrap (scrap) was studied. Co-chlorination refers to the synergistic effect of direct and indirect chlorination reactions. The feasibility of direct and indirect chlorination was explored from both ...

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A study on the recovery of fine chromite from UG2 tailings

The selective flotation of chromite minerals of any chromite ore have some difficulties due to dissolved cations from gangue minerals. ... Direct flotation tests had been conducted to extract the ...

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THERMODYNAMIC EFFECTS OF TEMPERATURE DURING ROASTING OF CHROMITE …

Around 95% chromium extraction yield was achieved when chromite was roasted with sodium and potassium hydroxides at 1000 °C for 2 h and water leached. View Show abstract

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Sufficient extraction of Cr from chromium ore processing

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 …

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Selective Removal of Iron from Chromite Ore Overburden …

A process to upgrade the nickel-rich fraction of the chromite ore overburden, mined from the Sukinda belt of Orissa state on the eastern coast of India, has been developed.

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Selective hydrogenation of maleic anhydride by modified copper chromite

M.Guisnet et al. (Editors),Heterogeneous Catalysis and Fine Chemicals 111 275 Selective hydrogenation of maleic anhydride by modified copper chromite catalysts G.L. Castiglionia, M. Gazzanob, G. StefaniC and A. Vaccaria 'Dip. Chim. Industr. e Materiali, Viale del Risorgimento 4,40136Bologna (Italy). bCFSM/CNR,Via Selmi …

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Selective sulfidising roasting for the removal of chrome …

The detailed mechanism and conditions for the selective sulfidation reaction were not studied and reported in their work. In follow-up thermodynamic and experimental studies by the present authors (Ahmad et al., 2014) it was demonstrated that selective sulfidation of chromite (as a representative of chrome spinel) is not a general …

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Study on Extraction of Iron From Chromite | Semantic Scholar

Research about extraction of iron from chemical‐grade South African chromite by carbothermic reduction and hydrochloric acid leaching was conducted in this study. It was found that temperature had a remarkable effect on the extraction yield of iron and that the optimum experimental temperature was 1100 °C, which coincides with the …

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Study on Extraction of Iron From Chromite | Request PDF

Thus, a kinetic study concerning the selective removal of iron from chromite by carbochlorination by using Cl2+CO was conducted between 606 and 720°C with the addition of 5% (w/w) NaCl and ...

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Selective Removal of Iron from Chromite Ore …

extraction proces t recoveos nickelr th primare, y objective should be to separat iroe fron m nickel I. n the present investigation thi nickel-rics, fractionh referre, d to as ore in the text ha, s been used to study the selective removal of iron. Iron (i thn e …

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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, …

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Partitioning and Mobility of Chromium in Iron-Rich Laterites …

The residues of the sequential extraction are chemically resistant minerals such as chromite (see Figure Figure4 4) that are highly prone to incomplete dissolution …

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Study on extraction of iron from chromite

Research about extraction of iron from chemical-grade South African chromite by carbothermic reduction and hydrochloric acid leaching was conducted in this study. It was found that temperature had a remarkable effect on the extraction yield of iron and that the optimum experimental temperature was 1100 °C, which coincides with the ...