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Roasting and leaching behaviors of vanadium and

2018-5-10  Calcification roasting–acid leaching of high-chromium vanadium slag (HCVS) was conducted to elucidate the roasting and leaching behaviors of vanadium and chromium. The effects of the purity of CaO, molar ratio between CaO and V2O5 (n(CaO)/n(V2O5)), roasting temperature, holding time, and the heating rate used in the oxidation–calcification processes were investigated. The roasting

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Roasting and leaching behaviors of vanadium and

Calcification roasting-acid leaching of high-chromium vanadium slag (HCVS) was conducted to elucidate the roasting and leaching behaviors of vanadium and chromium. The effects of the purity of CaO, molar ratio between CaO and V2O5 ( n(CaO)/ n(V 2 O 5 )), roasting temperature, holding time, and the heating rate used in the oxidation-calcification processes were investigated.

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Recovery of vanadium and chromium from leaching

In this study, the leaching solution of sodium roasting vanadium slag, which compositions were listed in Table 1, was obtained from CITIC Jinzhou Metal co., Ltd. in China.After the silicon was removed with industrial magnesium oxide and the chromium was extracted with amide, the raffinate was obtained, with compositions listed in Table 1.The organic phase was prepared by dissolving bis(2

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Physical Chemistry of Roasting and Leaching

2013-1-31  Physical Chemistry of Roasting and Leaching Reactions for Chromium Chemical Manufacturing and Its Impact on Environment ‐ A Review. Sergio Sanchez‐Segado. Search for more papers by this author. Animesh Jha.

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Effective Chromium Extraction from Chromium

Effects of roasting temperature, roasting time and addition amount of soda on the conversion rate were investigated by one-factor experimental designation. Optimization of chromium extraction from leaching liq-uids was also investigated. Leaching liquids with five dif-ferent chromium

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Efficient separation of chromium and vanadium by

2020-1-2  Calcification roasting–sodium carbonate (Na 2 CO 3) leaching process was carried out to separate chromium and vanadium efficiently from high chromium vanadium slag (HCVS).Then vanadium existed in the form of ammonium metavanadate (NH 4 VO 3) after precipitation from the purified leaching liquid, and highly pure V 2 O 5 was prepared, while chromium remained in the vanadium tailings in the

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Comparative study of alkali roasting and leaching of

2016-10-1  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

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Comparison of Ultrasound-Assisted and Regular

2017-11-27  Ultrasound-assisted leaching (UAL) was used for vanadium and chromium leaching from roasted material obtained by the calcification roasting of high-chromium–vanadium slag. UAL was compared with regular leaching. The effect of the leaching time and temperature, acid concentration, and liquid–solid ratio on the vanadium and chromium leaching behaviors was investigated. The UAL

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Processing of Chromite Overburden by Soda

The high leaching rate of vanadium and low leaching rate of chromium show good results of preferential extraction of vanadium from the chromium-bearing vanadium slag. namely soda roasting

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Cleaner extraction of vanadium from vanadium

2020-7-10  MnO 2 roasting was proposed as a suitable roasting method for vanadium extraction from vanadium-chromium slag (V–Cr slag). Acid leaching and vanadium precipitation were carried out for the recovery of vanadium, then V 2 O 5 was prepared. Manganese in the vanadium wastewater could be precipitated and recycled to the next roasting processes.

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Comparative study of alkali roasting and leaching of

roasting at moderately high temperatures followed by leaching at low temperatures has been investigated for the treatment of titanium oxide minerals and chromium ores.

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东北大学冶金学院博导:姜涛教授_东北大学冶金学院导师推荐

Wen, T. Jiang*, Y. Liu, X. Xue, Extraction behavior of vanadium and chromium by calcification roasting-acid leaching from high chromium vanadium slag: optimization using

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Selective Recovery of Chromium From Ferronickel

Chromium was selectively recovered from ferronickel slag by roasting the slag with addition of Na 2 O 2, followed by water leaching.The thermodynamic analysis revealed that in the presence of Na 2 O 2 at appropriate temperatures, the Cr 2 O 3 in the ferronickel slag can be converted to NaCrO 2, instead of Na 2 CrO 4, which prevents the formation of highly toxic Cr (VI).

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roasting and leaching process for chromium

chrome roasting and leaching process ifoza. roasting and leaching processess for chromium. roasting and leaching processess for chromium The Effect of Chromium on the Roasting Process Semantic Scholar Jul 9, 2016 NaCl, Na2SO4, and Na2CO3 as additives [913] The representative vanadium extraction route mainly consists of the following procedures: sodium salt roasting, water leaching

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roasting and leaching processess for chromium

Chromium Wikipedia, the free encyclopedia. Chromium is a chemical element with symbol Cr and atomic number 24. by silicothermic or aluminothermic reactions, or by roasting and leaching processes.

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Effective Chromium Extraction from Chromium

Effects of roasting temperature, roasting time and addition amount of soda on the conversion rate were investigated by one-factor experimental designation. Optimization of chromium extraction from leaching liq-uids was also investigated. Leaching liquids with five dif-ferent chromium

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Physical Chemistry of Roasting and Leaching

2013-1-31  Physical Chemistry of Roasting and Leaching Reactions for Chromium Chemical Manufacturing and Its Impact on Environment ‐ A Review. Sergio Sanchez‐Segado. Search for more papers by this author. Animesh Jha.

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A novel roasting process to extract vanadium and

Under the optimum microwave roasting conditions (1 NaOH/NaNO 3 mass ratio, 450 ℃ roasting temperature, and 10 min roasting time), the leaching rates of vanadium and chromium were 94.11% and 90.81%, respectively. In the leaching process, the reaction mechanism for the water leaching

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Comparative study of alkali roasting and leaching of

roasting at moderately high temperatures followed by leaching at low temperatures has been investigated for the treatment of titanium oxide minerals and chromium ores.

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Selective Recovery of Chromium From Ferronickel

Chromium was selectively recovered from ferronickel slag by roasting the slag with addition of Na 2 O 2, followed by water leaching.The thermodynamic analysis revealed that in the presence of Na 2 O 2 at appropriate temperatures, the Cr 2 O 3 in the ferronickel slag can be converted to NaCrO 2, instead of Na 2 CrO 4, which prevents the formation of highly toxic Cr (VI).

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Effective Extraction of Vanadium and Chromium

The roasting parameters have been studied as a function of roasting temperature, roasting time and ratio of alkali, in which the roasting temperature is the most effective factor on the leaching rate of vanadium and chromium. Under the optimum condition, the leaching rates of V

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Processing of Chromite Overburden by Soda

The high leaching rate of vanadium and low leaching rate of chromium show good results of preferential extraction of vanadium from the chromium-bearing vanadium slag. namely soda roasting

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东北大学冶金学院博导:姜涛教授_东北大学冶金学院导师推荐

Wen, T. Jiang*, Y. Liu, X. Xue, Extraction behavior of vanadium and chromium by calcification roasting-acid leaching from high chromium vanadium slag: optimization using

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彭浩博士 yznu

2017-6-14  Leaching Kinetic of Vanadium from Calcium-roasting High-Chromium Vanadium Slag Enhanced by Electric Field. ACS Omega, 2020, 5 (28): 17664–17671. 7. Hao Peng*, Qian Shang, Ronghua Chen, Liuying Zhang, Ya Chen, Jing Guo. Step-Adsorption of 8.

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Recovery of chromium by calcium-roasting, sodium

2020-10-20  Here, we review chromium resources and methods to leach out Cr, such as calcium-roasting, sodium-roasting, acidic leaching, alkaline leaching and sub-molten technology. 中文翻译: 钙焙烧,钠焙烧,酸性浸提,碱性浸提和亚熔融技术回收铬的研究

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Asynchronous extraction of vanadium and chromium from

2015-7-1  Leaching residue of the fractional roasting stage is then roasted secondarily to extract chromium and 96.4% of chromium is extracted from the leaching residue in optimal conditions. Overall extractions of vanadium and chromium are 98.9% and 96.6%, respectively.

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roasting and leaching process for chromium

chrome roasting and leaching process ifoza. roasting and leaching processess for chromium. roasting and leaching processess for chromium The Effect of Chromium on the Roasting Process Semantic Scholar Jul 9, 2016 NaCl, Na2SO4, and Na2CO3 as additives [913] The representative vanadium extraction route mainly consists of the following procedures: sodium salt roasting, water leaching

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roasting and leaching processess for chromium

Chromium Wikipedia, the free encyclopedia. Chromium is a chemical element with symbol Cr and atomic number 24. by silicothermic or aluminothermic reactions, or by roasting and leaching processes.

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A novel roasting process to extract vanadium and

Under the optimum microwave roasting conditions (1 NaOH/NaNO 3 mass ratio, 450 ℃ roasting temperature, and 10 min roasting time), the leaching rates of vanadium and chromium were 94.11% and 90.81%, respectively. In the leaching process, the reaction mechanism for the water leaching

get price

Recovery of chromium by calcium-roasting, sodium

2020-10-20  Here, we review chromium resources and methods to leach out Cr, such as calcium-roasting, sodium-roasting, acidic leaching, alkaline leaching and sub-molten technology. 中文翻译: 钙焙烧,钠焙烧,酸性浸提,碱性浸提和亚熔融技术回收铬的研究

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Effective Extraction of Vanadium and Chromium

The roasting parameters have been studied as a function of roasting temperature, roasting time and ratio of alkali, in which the roasting temperature is the most effective factor on the leaching rate of vanadium and chromium. Under the optimum condition, the leaching rates of V

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Leaching of hexavalent chromium from young chromite

In the roasting process, insoluble trivalent chromium [Cr(III)] present in the ores oxidizes to soluble hexavalent Cr [Cr(VI)], which is then recovered by aqueous leaching for further processing (Burke et al., 1991). The technology dates back to 1845 and is still in use

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Effective Chromium Extraction from Chromium

Chromium slags without vanadium were synthesized in the laboratory to mimick mineralogical characteristics of Pan-steel vanadium slag and characterized by XRD, SEM/EDS and TG-DSC techniques. Conditions for Cr extraction from the chromium slag after sodium roasting by leaching with water were studied and optimized.

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Asynchronous extraction of vanadium and chromium from

2015-7-1  Leaching residue of the fractional roasting stage is then roasted secondarily to extract chromium and 96.4% of chromium is extracted from the leaching residue in optimal conditions. Overall extractions of vanadium and chromium are 98.9% and 96.6%, respectively.

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Process for Chromite MDPI

2019-1-28  bi-roasting and neutral leaching technology [28], preheating single-roasting technology [29], oxidizing Wang et al. [4] found that in the non-calcium roasting process, the recovery of chromium could reach >90%. In this process, the amount of chromic residue can be reduced to one-third of that in the calcium-roasting process, and the Cr(VI

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A novel reductive alkali roasting of chromite ores

A novel reduction reaction for extracting Cr 2 O 3 from chromite ores is demonstrated by excluding the formation of carcinogenic chromate (Cr 6+) intermediates.We have investigated in detail the underpinning high-temperature reduction reaction: FeCr 2 O 4 +Na 2 CO 3 +2[C]=[Fe]+Na 2 Cr 2 O 4 +3CO (g), which defines the process chemistry for the formation of sodium chromite (Na 2 CrO 2) as an

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Sulfation–Roasting–Leaching–Precipitation Processes for

2019-6-24  2.2. Sulfation–Roasting–Leaching–Precipitation Sulfation–roasting–leaching–precipitation (SRLP) is a combination of four consecutive and complementary processes. The original sample was first crushed and passed through 500 m and 100 m sieves to obtain two samples (+100–500 m and 100 m). As described by Borra et al.,

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Extracting Chromium from Stainless Steel Slags by

An effective extraction of chromium from SSL slag might be a solution. The conventional ind Extracting Chromium from Stainless Steel Slags by NaOH‐Added Pellet Roasting Followed by Water Leaching Ji 2017 steel research international Wiley Online Library

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Reclamation of reactive metal oxides from complex

2015-3-10  In this context, alkali roasting and leaching as a novel approach for alumina, chromium oxide, titanium dioxide, rare-earth and vanadium pentoxide recovery is presented and discussed with examples for the separation of metal values. 2.

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