Leaching Processleaching Process For Chromite
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- Leaching Processleaching Process For Chromite
The current strategy reports the recovery of precious group metals (PGMs) from Na2CO3 roast of Saudi Arabian ophiolitic chromite ore at 1160 °C under atmospheric O2.
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The major portion of platinum and palladium produced today from primary sources originates from the Bushveld Igneous Complex in South Africa. The most important reefs mined are the Merensky, Upper Group Two (UG-2) and Platreef (Cramer, 2001).Ore grades range from 3 to 8 g/t PGM, with associated nickel and copper in the 0.1–0.2% …
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Abstract: Chromite beneficiation operations in Sukinda valley (India) produce large amounts of tailings, which are stored in open air. In this study, bioleaching experiments …
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18.65 g of a typical leaching residue smaller than 10 μm obtained from a leaching test with a low leaching yield of chromium (37.5%) was also studied in this work.Processing details of the test and phases composition can be found in our earlier reporting (Jiang et al., 2014, Zhao et al., 2014).The residue was collected after filtration …
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The results of the leaching kinetics analysis indicated that the leaching of Fe and Cr from the COPR was controlled by a surface chemical reaction, and the leaching of Al was …
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In the leaching process of chromite, how to quickly separate sodium chromate from leaching slurry is a key issue. In this paper, a simple method, named thermal sedimentation, was firstly introduced into the solid–liquid separation of sodium chromate. The results shown that the thermal sedimentation can respectively shorten …
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The soda ash roasting process produces Chromite Ore Processing Residue (COPR) containing 1130-8500 mg/kg carcinogenic hexavalent chromium (Cr(VI)) due to the industrial incomplete leaching (Du and ...
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During decomposition, silica in the chromite ore was first attracted, forming water-soluble potassium silicate, while insoluble product will be produced with alumina (aluminum in chromite ore) in the following leaching process. It was a progressive erosion process as the SEM images shown in Fig. 8 and the corresponding XRD patterns of Fig. 9.
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Oxidative-alkaline leaching of vanadium from vanadium-chromium-reducing residues with K 2 Cr 2 O 7 was investigated in this paper. The effects of processing parameters including dosage of NaOH, dosage of K 2 Cr 2 O 7, reaction time, and reaction temperature on the leaching efficiency of vanadium were studied.The results simulated …
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The effect of pyrolysis process with sewage sludge on the chromium behavior of chromite ore processing residue (COPR) was examined in this study. The behavior of chromium was characterized in term of chromium oxidation test, pH-static leaching tests, column leaching test and sequential extraction te …
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DOI: 10.1016/J.MINENG.2014.01.025 Corpus ID: 95928403; A clean and efficient leaching process for chromite ore @article{Gang2014ACA, title={A clean and efficient leaching process for chromite ore}, author={Chen Gang and Wang Xiaohui and Hao Du and Ying Zhang and Jiajun Wang and Shili Zheng and Yi Zhang}, journal={Minerals Engineering}, …
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Chromite ore processing residue (COPR) contains very high levels of chromium as Cr(III) and Cr(VI) and has a pH of ∼11.5 to 12. Millions of tonnes of COPR have in the past been deposited in urban areas. We have studied the factors that control leaching of Cr(VI), Ca, Al, Si, and Mg from COPR by means of batch experiments, mineralogical …
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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 ...
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Leaching characteristics of chromium ore processing residue (COPR) for the long term (simulating a 20-year leaching scenario) were investigated using laboratory flow …
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Remediation process and utilization treatment of chromite ore processing residue (COPR) is an environmental issue which is not solved completely. ... After water leaching, the Cr (VI) content reduced to 312 mg/kg. The removal rate was 72.3%. Pyrolysis parameters, including heating temperature, sawdust ratio, heating time, were …
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Summary This chapter contains sections titled: Introduction Crystal Structure of Chromite Minerals Thermal Decomposition of Chromites Alkali Roasting of Chromites Leaching of Chromite Minerals Chro...
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8.1.3. Hydrothermal leaching of chromite. In this process, the chromite concentrate is digested with a 60% wt NaOH solution at 250 °C under an oxygen atmosphere with a partial pressure of 3.2 MPa. The following reactions take place during this process: 56
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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 ...
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Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate …
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With the goal of improving the leaching behavior of chromite in sulfuric acid solution, Geveci et al. used perchloric acid as the catalyst in the leaching process at atmospheric pressure, achieving …
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The large increase in leaching of Cr(VI) upon infiltration of sulfate, either as FeSO4 or Na2SO4, was caused by anion exchange of sulfates for chromate in the layered double hydroxide mineral hydrocalumite, a process for which scanning electron microscopy with energy-dispersive X-ray microanalysis provided direct evidence. Chromite ore …
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Heap leaching of laterites for extraction of nickel and cobalt is an attractive alternative to capital and energy intensive high pressure acid leaching, the dominant hydrometallurgical processing ...
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leaching processleaching process for chromite; A clean and efficient leaching process for chromite ore . Jun 01, 2014 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 from the calcium roasting process is the residue of water ...
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Various processes such as soda-ash roasting (Antony et al., 2001), acid leaching (Geveci et al., 2002, Zhao et al., 2014), alkali leaching (Xu et al., 2005, Zhang …
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Abstract. The efficacious treatment and resource utilization of the chromite ore processing residue (COPR) is important for chromate salt production. In this study, …
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The calcium-roasting treatment process, a typical alkaline process, of chromite is widely used in China [16]. The silicon, aluminum, and iron in chromite react with calcium oxide to form insoluble
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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 …
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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 ...
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In the liquid phase oxidation leaching process of chromite salt, a new dynamic-static combined stirred mode is proposed. That is, a static cylindrical baffle is fixedly installed at a certain ...
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The sulfuric acid leaching process is widely considered to be a cleaner technology to prepare chromium salt from natural chromite as no Cr(VI)-bearing wastes are generated or discharged.
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Abstract This study presents chemical, mineralogical, and leaching characterization of chromite ore processing residue (COPR) derived from the soda ash process, which is currently replacing the lime-based process in China, the world's largest chromite processor. Results indicated that, while soda ash COPR had 8,500 mg/kg …
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The major process factors and conditions that were employed in these studies involved acid concentration (40-85% v/v), temperature (140-210°C), leaching time (1-6 hr.), solid to liquid ratio (1: ...
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Chromite ore processing residue (COPR), derived from the so-called high lime processing of chromite ore, contains high levels of Cr(III) and Cr(VI) and has a pH between 11 and 12. ... in solution was transported away with the infiltrating solution. The large increase in leaching of Cr(VI) upon infiltration of sulfate, either as FeSO4 or Na2SO4 ...
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Batch leaching tests, qualitative and quantitative x-ray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching mechanisms of Cr(VI) from chromite ore processing residue (COPR) samples obtained from an urban area in Hudson County, New Jersey.
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