Aluminium and iron separation from chromium solutions by precipitation with cupferron

Majone, Mauro

doi:10.1080/09593338609384442

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…They are widely used in chemistry as analytical reagents for the extraction of many metals [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and their spectrophotometric analysis [15], and as precursors for the synthesis of nanoparticles of metal oxides [16][17][18][19][20].…”

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confidence: 99%

Complexes of some tervalent metals with N-alkyl(benzyl)nitrozohydroxylamine derivatives

Kovalchukova

Namichemazi

Bostanabad

et al. 2016

Russ. J. Inorg. Chem.

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Twenty two new complexes of some tervalent metals (aluminum, chromium, iron, and lanthanides) with nitrozohydroxylamine N-alkyl(benzyl) derivatives · nH 2 O, (m = 1-5) were synthesized and isolated in a crystalline state. The crystal and molecular structures of the iron(III) complex with N-(2-fluorobenzyl)-N-nitrozohydroxylamine were determined by X-ray diffraction. An octahedral coordination of the central ion and a bidentate chelating coordination of the organic ligand were established. The spectral criteria of coordination of nitrozohydroxylamine alkyl(benzyl) derivatives were determined, and the complexation processes in solutions were studied.The compounds containing N-nitrozohydroxylamine moieties are good chelating reagents able of forming stable metal complexes with metals of various types. They are widely used in chemistry as analytical reagents for the extraction of many metals [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and their spectrophotometric analysis [15], and as precursors for the synthesis of nanoparticles of metal oxides [16][17][18][19][20].

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confidence: 99%

Complexes of some tervalent metals with N-alkyl(benzyl)nitrozohydroxylamine derivatives

Kovalchukova

Namichemazi

Bostanabad

et al. 2016

Russ. J. Inorg. Chem.

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“…When the Fe 3+ ion is separated via neutralization, the Cr 3+ ion is usually wrapped around or precipitated as hydroxide with iron hydroxide, which results in the loss of chromium and secondary pollution (Cheng-yan et al, 2008;Yuan et al, 2013). Majone (1986), Hu et al (2006), Jian-Hui et al (2011), respectively, used the goethite method, the Mohr salt crystallization method and cupferron as a precipitating agent to separate chromium and iron successfully, but the processes are relatively complicated and the problem of secondary pollution cannot be completely resolved. This prevents these methods from been widely used in industry.…”

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confidence: 99%

Selective Complex Precipitation for Ferro-Chrome Separation From Electroplating Sludge Leaching Solution

Wang

et al. 2021

Front. Chem.

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In this paper, aiming at the problem of chrome-iron separation in electroplating sludge, the separation of ferrochrome by complexation and precipitation with benzoic acid as complexing agent is achieved. The optimal conditions consisted of a 1: 3 molar ratio of Fe3+: C6H5COOH, a reaction temperature of 30°C, a final pH of 2.5 and a reaction time of 2 min. The separation rate of the iron was 97.38% and the rate of loss of chromium was only 3.59%. The ferrochromium separation products were analyzed by XRD, fluorescence spectroscopy, infrared spectroscopy and H NMR Spectroscopy in order to study the mechanism of precipitation. The results showed that benzoic acid preferentially forms a complex with iron and iron benzoate precipitates with an increase pH. The iron benzoate crystals have a fine particle size, settle rapidly and are easy to filter. The separation of Cr 3+/Fe3+ was successful using our methodology.

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“…Al 3+ and Fe 3+ separation is a major concern for the Salt Lake chemical industry, wastewater treatment, and hydrometallurgy industry. , Because the properties of Al 3+ and Fe 3+ are similar, both AlCl 3 and FeCl 3 have a hydrolytic equilibrium in aqueous solution, which makes the solution acidic. Al 3+ and Fe 3+ can form a complex precipitate with some organic substances .…”

Section: Introductionmentioning

confidence: 99%

Phase Diagram of AlCl₃–FeCl₃–H₂O(−HCl) Salt Water System at 298.15 K and Its Application in the Crystallization of AlCl₃·6H₂O

Cheng

Cao

et al. 2019

J. Chem. Eng. Data

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Aluminum–ferric separation has attracted significant interest in the field of hydrometallurgy. Using phase equilibria theory, fractional crystallization and separation of a mixed salt solution is a relatively effective method. The phase equilibria of the ternary system or tertiary system AlCl3–FeCl3–H2O(−HCl) at 298.15 K for different H+ concentrations were studied using the isothermal dissolution equilibrium method, and plotted the corresponding phase diagrams and density diagrams. The experimental results show that with increasing H+ concentration, the solubility of AlCl3 decreased from 31.20 to 0.13%, and the crystallization region of AlCl3·6H2O gradually increased. H+ concentration had little influence on FeCl3 solubility, and the solubility of FeCl3 was 47.52%. Through theoretical calculations, the desired amount of water to evaporate and crystal precipitation can be obtained through the calculation model for the system composed of different materials. The route is designed by the phase equilibrium and the phase diagram theory, and the separation of aluminum and ferric from aluminate acid leaching solution of coal gangue in literature. The direct yield of AlCl3·6H2O obtained by evaporation and crystallization was 77.15%, and the purity reached 99.81% after rinsing with concentrated hydrochloric acid.

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Aluminium and iron separation from chromium solutions by precipitation with cupferron

Cited by 5 publications

References 2 publications

Complexes of some tervalent metals with N-alkyl(benzyl)nitrozohydroxylamine derivatives

Complexes of some tervalent metals with N-alkyl(benzyl)nitrozohydroxylamine derivatives

Selective Complex Precipitation for Ferro-Chrome Separation From Electroplating Sludge Leaching Solution

Phase Diagram of AlCl₃–FeCl₃–H₂O(−HCl) Salt Water System at 298.15 K and Its Application in the Crystallization of AlCl₃·6H₂O

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Aluminium and iron separation from chromium solutions by precipitation with cupferron

Cited by 5 publications

References 2 publications

Complexes of some tervalent metals with N-alkyl(benzyl)nitrozohydroxylamine derivatives

Complexes of some tervalent metals with N-alkyl(benzyl)nitrozohydroxylamine derivatives

Selective Complex Precipitation for Ferro-Chrome Separation From Electroplating Sludge Leaching Solution

Phase Diagram of AlCl3–FeCl3–H2O(−HCl) Salt Water System at 298.15 K and Its Application in the Crystallization of AlCl3·6H2O

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Phase Diagram of AlCl₃–FeCl₃–H₂O(−HCl) Salt Water System at 298.15 K and Its Application in the Crystallization of AlCl₃·6H₂O