Sulfuric acid leaching of Turkish chromite concentrate

Geveci, Ahmet; Topkaya, Yavuz; Ayhan, E

doi:10.1016/s0892-6875(02)00159-0

Cited by 48 publications

(18 citation statements)

References 2 publications

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“…Such result corroborates previous studies carried out by Correa [12]. Chromite and magnetite are minerals belonging to the spinel group, and chromite has a crystalline structure that is normally difficult to leach [21,22]. The peaks reported for the chromite and magnetite on the diffractogram are overlapped which may be explained by their similar crystalline net.…”

Section: Mineralogical Analysis Of the Aod-l Sludgesupporting

confidence: 91%

“…5 reveal the main crystalline phases identified were chromite (FeCr 2 O 4 ) and quartz (SiO 2 ). Chromite was not completely dissolved with H 2 SO 4 50% (v/v) but it can be digested by a mixture of concentrated H 2 SO 4 and HClO 4 as oxidizing agent [21,22]. Therefore, HClO 4 was used at changing concentrations in the digestion experiments according to the following HClO 4 /AOD-L sludge ratios (volume of HClO 4 divided by mass of AOD-L sludge): 0, 2 and 4 mL/g.…”

Section: Digestion Samplesmentioning

confidence: 99%

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Characterization of the fine fraction of the argon oxygen decarburization with lance (AOD-L) sludge generated by the stainless steelmaking industry

Majuste

Mansur

2008

Journal of Hazardous Materials

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Section: Mineralogical Analysis Of the Aod-l Sludgesupporting

confidence: 91%

Section: Digestion Samplesmentioning

confidence: 99%

Characterization of the fine fraction of the argon oxygen decarburization with lance (AOD-L) sludge generated by the stainless steelmaking industry

Majuste

Mansur

2008

Journal of Hazardous Materials

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“…Landfilling is the traditional method of waste disposal and has become a significant source of hazardous hexavalent chromium [20]. Various processes such as sodaash roasting [20], acid leaching [21,22], alkali leaching [23,24] and alkali fusion [25] have been developed for the processing of chromite ores in order to produce sodium chromate (Na 2 CrO 4 ), which is the primary product used for the manufacturing of different chromium chemicals. Because of economic and technical reasons, just soda-ash roasting has been used worldwide on a commercial scale, either in a rotary kiln or in a rotary hearth furnace.…”

Section: Chromium Extraction From Chromite Orementioning

confidence: 99%

Comparative study of alkali roasting and leaching of chromite ores and titaniferous minerals

et al. 2016

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Extraction of titanium and chromium oxides may be achieved via roasting the respective minerals with alkali at high temperatures, followed by water and organic acid leaching. 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 discussed in terms of designing the process. Samples of chromite and titaniferous minerals were roasted with NaOH and KOH in a temperature range of 400˚C -1000˚C in an oxidizing atmosphere. The roasted chromite and ilmenite samples were further processed in order to extract water-soluble Na 2 CrO 4 from the reacted chromite and purify titanium dioxide from titaniferous minerals, respectively. The TiO 2 purity obtained after roasting at 400 o C with NaOH and double leaching was 49.2 wt.% , whereas when using KOH the purity was 54.5 wt.%. The highest TiO 2 purity obtained after roasting at 1000 o C for 2 hours and double leaching with water and organic acids was 84 wt.%. At low temperature (400 o C) the recovery of chromium was higher for chromite roasted with KOH than for chromite roasted with NaOH. However, at high temperatures (700 o C and 1000 o C) chromium recoveries were similar when roasting with both hydroxides. Around 95% chromium extraction yield was achieved when chromite was roasted with sodium and potassium hydroxides at 1000 o C for 2 hours and water leached.

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“…The extraction of chromium by leaching in sulfuric acid is limited without an oxidant. With the goal of improving the leaching behavior of chromite in sulfuric acid solution, Geveci et al [50] used perchloric acid as the catalyst in the leaching process at atmospheric pressure, achieving 83% chromium extraction. Vardar et al [51] determined that the apparent activation energy for the leaching of chromite in sulfuric acid at atmospheric pressure is 77 kJ·mol −1 in the presence of perchlorate.…”

Section: Leaching Process Of Chromite In Sulfuric Acid Solutionmentioning

confidence: 99%

Advances towards a Clean Hydrometallurgical Process for Chromite

2016

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Abstract:Because of the acute toxicity of Cr(VI)-bearing substances, the pollution problem caused by chromite process residue has become a worldwide concern. In the view of relevant studies, the technologies based on the alkali treatment cannot fundamentally resolve the pollution problem, because the oxidation of Cr(III) to Cr(VI) is unavoidable during chromite decomposition. In contrast, the oxidation of Cr(III) to Cr(VI) can be controlled by the sulfuric acid treatment of chromite, and the Cr(VI) pollution can be eliminated from the original source of production. Many research studies focusing on the resolutions of the key obstacles hindering the development of the sulfuric acid treatment process have been carried out, and significant progress has been achieved. In this study, a clean hydrometallurgical process without the generation of hexavalent chromium is demonstrated. First, the chromite was decomposed and leached by sulfuric acid solution in the presence of an oxidant. Then, iron was hydrothermally removed from the acid solution as the precipitate of jarosite. Finally, chromium salts were obtained by adjusting the basicity of the solution, separation and drying. With the aim of realizing industrialization, future research emphasis on the development of the sulfuric acid treatment process is proposed in this study.

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Sulfuric acid leaching of Turkish chromite concentrate

Cited by 48 publications

References 2 publications

Characterization of the fine fraction of the argon oxygen decarburization with lance (AOD-L) sludge generated by the stainless steelmaking industry

Characterization of the fine fraction of the argon oxygen decarburization with lance (AOD-L) sludge generated by the stainless steelmaking industry

Comparative study of alkali roasting and leaching of chromite ores and titaniferous minerals

Advances towards a Clean Hydrometallurgical Process for Chromite

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