Synthesis of manganese zinc ferrite using ferrous pickle liquor and pyrolusite ore

Narasimhan, B.R.V.; Kumar, Satendra; Narayanan, T.S.N. Sankara

doi:10.1007/s10311-009-0272-4

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…On the other hand, massive quantities of inexpensive raw materials such as natural ores or waste products rich in base metals are found in many countries. However, studies on their application for the synthesis of nanocrystalline ferrite products are rare. , Sludge precipitation of heavy metals has been attempted during the treatment of acid mine drainage (AMD) through neutralization at pH 8.5 . The study was limited to precipitation with no subsequent heat treatment, and thus yielded a material of very low magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Developed Process Circuit Flowsheet of Al Amar Ore for Production of Nanocrystalline Ferrite and Improving Gold Recovery

et al. 2020

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Amar gold ore is rich in sulfides of base metals and is commercially applied for the production of copper concentrate via floatation and gold bullion by cyanidation of tailing. The current process flowsheet suffers from low gold recovery (∼60%) and loss of metals in the hazardous stockpiled residue. This work addresses these drawbacks by a newly experimental redesign of the process circuit. The innovative flowsheet comprises a sequence of operations, including acid leaching of the roasted ore, gold recovery from the leach residue, and preparation of a valuable zinc−copper−lead ferrite from the filtrate by coprecipitation followed by heat treatment. The ore is roasted at 650 °C and then leached in 20% HCl, where most of Zn, Cu, Pb, and Fe contents are dissolved, while pristine gold remains in the residue. Most of the gold (∼93%) can be recovered by cyanidation of the acid leach residue. Stoichiometric ratios of dissolved Zn, Cu, Pb, and Fe in the acid leach solution can be kept at 0.6:0.3:0.1:2.0, respectively, only by adding a small amount of ferric chloride. These metals are coprecipitated at varying pH values from 8 to 10, and the produced powders are annealed at temperatures from 600 to 1100 °C. X-ray diffraction (XRD) charts reveal sharp peaks of the targeted Zn 0.6 Cu 0.3 Pb 0.1 Fe 2 O 4 phase at 600 °C, while a highly crystalline single phase is obtained at 1100 °C, independently of precipitation pH. The crystalline size of the produced powders increases with annealing temperatures (from 18−27 nm at 600 °C to 85−105 nm at 1100 °C). The finest size is found at pH 12. Scanning electron microscopy (SEM) investigation shows uniform cubic microstructures of samples annealed at 1100 °C. The produced ferrite powders exhibit soft magnetic characteristics. Saturation magnetization, M s , substantially increases with pH. Coercivity, H c, increases with increasing annealing temperatures, from 600 to 800 °C, and decreases above 800 °C. Preliminary cost−benefit analysis revealed that the profit margin of the proposed process flowsheet is promising. The wastewater is almost free of heavy metals. Our advances in high gold recovery and preparation of valuable magnetic nanocrystalline ferrite provide exciting opportunities to enhance and maximize Al Amar ore production for practical applications.

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Section: Introductionmentioning

confidence: 99%

Developed Process Circuit Flowsheet of Al Amar Ore for Production of Nanocrystalline Ferrite and Improving Gold Recovery

et al. 2020

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“…This phenomenon causes to form metal soaps as the passive layer 26 . As a prominent member of ferrite pigments zinc ferrite (ZnFe 2 O 4 ) has attracted significant research interest because of its nontoxic nature and unique physical, mechanical and corrosion inhibition properties [27][28][29][30] . Meanwhile, several limitations and defects have been reported for conventional micron sized pigments 31 .…”

Section: Introductionmentioning

confidence: 99%

Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

et al. 2017

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The corrosion inhibition of nanoparticulates zinc ferrite (NZF) pigment was studied. The steel samples were immersed in the NZF pigment extract in 3.5 wt. % NaCl. Electrochemical tests such as electrochemical impedance spectroscopy (EIS) and polarization as well as surface analysis were employed to evaluate the effect of NZF on the steel corrosion. The concentration of Zn and Fe in the pigment extracts before and after immersion of mild steel samples was evaluated by inductively coupled plasma-optical emission spectrometry (ICP-OES). EIS results in total agreement with results of polarization test demonstrated superiority of NZF as an anticorrosion pigment. In the case of samples exposed to NZF extract, the higher resistance and lower double layer capacitance extracted from impedance spectra as well as lower current density from polarization results might be attributed to precipitation of an inhibitive layer on the surface. This was also supported by SEM/EDS and ICP-OES results.

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A study on treatment methods of spent pickling liquor generated by pickling process of steel

Devi

Singhal

Gupta

et al. 2014

Clean Techn Environ Policy

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Synthesis of manganese zinc ferrite using ferrous pickle liquor and pyrolusite ore

Cited by 4 publications

References 25 publications

Developed Process Circuit Flowsheet of Al Amar Ore for Production of Nanocrystalline Ferrite and Improving Gold Recovery

Developed Process Circuit Flowsheet of Al Amar Ore for Production of Nanocrystalline Ferrite and Improving Gold Recovery

Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

A study on treatment methods of spent pickling liquor generated by pickling process of steel

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