A simple pilot-scale magnetic adsorption separation (MAS) device was designed, fabricated and tested in treating aqueous solution stream laden with highly toxic and mobile hexavalent chromium [Cr(VI)] ions using super-paramagnetic crystalline polypyrrole–magnetite nanocomposite (PPy–Fe 3 O 4 NC) as a mobile scavenger. In the …

Magnetic Properties of Ferritchromite and Cr‐Magnetite and Monitoring of Cr‐Spinels Alteration in Ultramafic and Mafic Rocks - Hodel - 2020 - Geochemistry, Geophysics, Geosystems - Wiley Online …

The magnetic separation efficiency of the grade of Cr and Fe in concentrate, concentrate yield, as well as the recovery rates of Cr and Fe were presented in Fig. 5 (d), which increased strikingly with the roasting time from 0.25 h to 1 h, and then changed little. As a result, 1 h was the suitable roasting time.

The Cr:Fe ratio (chromium-to-iron mass ratio) of chromite affects the production of chrome-based ferroalloys. Although the literature contains numerous reports related to the magnetic separation of different minerals, limited work concerning the application of magnetic separation to fine chromite from the Sukinda region of India to …

Magnetic Separators We make permanent Magnetic Separation Equipment for any application, suitable for almost any industry.; Metal Detection Designed to monitor gravity-fed products, pneumatically conveyed materials on belts, & liquids and slurries in pipes.; Material Handling Equipment A large lineup of material handling equipment for the …

Magnetic separation studies on ferruginous chromite fine to enhance Cr:Fe ratio. Summary of magnetic separation test results. …

Magnetic separation technology has been of great concern recently because of its simple and efficient process. Especially, magnetic particles, which still are based on the mechanism of adsorption at the solid–liquid interface, are applied to the removal and the recovery of heavy metal ions in wastewater [9], [10], [11]. ... Cr<0.5mg/L. …

Magnetic switching of A2 gen-2 precipitates in the R1 phase in the AlCo(Cr)FeNi HEA. (a, b) Magnetic contribution to the phase shift ϕm recorded after returning to remanence from opposite out-of ...

The focus of this paper was a novel model of Cr(VI) extraction process. The original so-called "magnetic-fluids fixed bed" (MFFB), which bridged the solvent extraction and the fixed-bed extraction by the theory of the high gradient magnetic separation (HGMS), has been explained. The MFFB integrated …

Periyasamy et al. reported the synthesis of a magnetic cellulose-based adsorbent, which could achieve rapid solid–liquid separation in the magnetic field, but the Cr(VI) adsorption capacity (26.6 mg/g) and removal rate (53%) were relatively low (Periyasamy et al. 2017). However, the reported cellulose-based adsorbents were …

Slags coming from stainless steel (SS) and ferrochromium (FeCr) production generally contain between 1 and 10% Cr, mostly present in entrapped metallic particles (Fe–Cr alloys) and in spinel structures. To recover Cr from these slags, magnetic and gravity separation techniques were tested for up-concentrating Cr in a fraction for further …

Therefore, in order to obtain more active groups on the surface of magnetic nanoparticles to remove Cr(VI), polymers were coated on the surface in this study, which is of great practical significance for its functional modification. ... but the material still had good saturation magnetization and met the requirements of fast magnetic separation.

Materials Engineering. Slag. Article PDF Available. Enrichment Characteristics of Cr in Chromium Slag after Pre-Reduction and Melting/Magnetic …

Enrichment Characteristics of Cr in Chromium Slag after Pre-Reduction and Melting/Magnetic Separation Treatment - PMC. Journal List. Materials (Basel) …

address this, dry magnetic separation is an alternative approach to separate these iron-bearing gangue. minerals from the chromite. This work investigated on the application of different dry high ...

The fine chromite was observed to be upgraded to a Cr:Fe ratio of 2.2 with a yield of 55.7% through the use of an induced roll magnetic separator and a feed …

Abstract. This paper investigates the potential for using dry magnetic separation to reduce the chromium content of a dried high quality olivine sand product in order to meet with anticipated ...

The other parameters were kept constant: pH value of feed solution was 2, initial Cr (VI) concentration was 111.674 mg/L, flow rate of Cr (VI) solution in magnetic separation chamber was 8 mm/min and temperature was 20 °C. The relationship of Cr (VI) dynamic E and T at different TBP concentration was shown in Fig. 12. Based on the …

Herein, a novel magnetic amine-functionalized MIL-101(Cr) (NH 2-MIL-101(Cr)@Fe 3 O 4) was prepared and used to efficiently remove ReO 4-from solution for the facile magnetic separation. A series of environmental parameters were considered to investigate the adsorption performance of NH 2-MIL-101(Cr)@Fe 3 O 4.

@article{Muliwa2016MagneticAS, title={Magnetic adsorption separation (MAS) process: An alternative method of extracting Cr(VI) from aqueous solution using polypyrrole coated Fe3O4 nanocomposites}, author={Anthony M. Muliwa and Taile Yvonne Leswifi and Maurice Stephen Onyango and Arjun Maity}, journal={Separation and Purification …

separation of chromite by magnetic separation will be easier and will occur at a higher magnetic strength as compared to the ferruginous ores [8]. Further studies need to target recovery of these fine chromite using high intensity magnetic separation. Mg Si Al Cr …

Magnetic separation was carried out with a magnetic separator, ... (% Cr) s is the chromium content in the tail slag after separation and (% Cr) a is the chromium content in the alloy after separation, both measured as wt.%. Because the purpose of this research was to enrich chromium in slag, the recovery rate of chromium was defined as …

Thus, magnetic separation is an alternative process to im-proving the Cr:Fe ratio through discarding the near-density iron-bearing minerals, which represents a major challenge in …

The optimum grade that could be obtained from single-stage dry magnetic separation was 35.52% Mn, and with a Mn:Fe ratio of 1.77, and 44% Mn recovery in the case of sample 1; whereas, a 33.75% Mn grade, with a Mn:Fe ratio of 1.66 at Mn recovery of 44% was reported for Sample 2. It was observed that both samples had a similar input chemistry ...

Magnetic separation is a process where a contaminant is first attached onto a magnetic carrier material (e.g., magnetite), and subsequently, the contaminant-laden carrier is separated under a magnetic field. The simplest magnetic separator is a permanent magnet. ... The chemical compositions of the Aluchrom wire included Fe (70%), Cr ...

Highly efficient and selective separation of Cr (VI) is great of importance in environmental pollution control. In this study, a novel family of hydrophobic DESs has been designed and synthesized by mixing parabens and quaternary ammonium, and then used to extract heavy metal Cr (VI) from water phase and the content of Cr (VI) is measured by …

Magnetic properties of AlCoFeNi and AlCo 0.5 Cr 0.5 FeNi HEAs (A) Magnetization (M) vs applied magnetic field (H) measured at a temperature of 300 K for AlCoFeNi and AlCo 0.5 Cr 0.5 FeNi HEAs.

Magnetic separation is a technology or process that exploits the difference in magnetic properties between the ore ... Further studies need to target recovery of these fine chromite using high intensity magnetic separation. Mg Si Al Cr Fe Ca . MMME 138-6 Acknowledgements The author is thankful for University of Johannesburg support, …

2.4 High-Gradient Magnetic Separator (HGMS) As its name implies, a high gradient magnetic separator employs magnetic field charges to separate magnetic materials. Marston and Kolm introduced this method at the Massachusetts Institute of Technology in the late 1960s and early 1970s.

To enhance the Cr:Fe ratio of the samples, gravity concentration by the spiral concentrator and magnetic separation by the wet-high intensity magnetic separator was used. The details of the experimental setup along with the process conditions are discussed in Section 2.3.1 and Section 2.3.2 .

In case of SS slag and low carbon (LC) FeCr slag a wet high intensity magnetic separation can up-concentrate Cr in the SS slag (fraction <150 µm) from 2.3 …

by magnetic separation was 3.70 g, and the average chromium con tent in the alloy (% Cr) a was 1.27%. For Experiment NO. 4, the average mass of alloy m a was 3.63 g, and the average

MELRC has been confirmed to be effective in Cr sorption and magnetic separation in disposing the simulated wastewater, thus it was used to treat the actual electroplating wastewater by combined biochar sorption and magnetic separation processes. Since the pH of the wastewater is 2.79, which is suitable for both sorption and …

2.4 High-Gradient Magnetic Separator (HGMS) As its name implies, a high gradient magnetic separator employs magnetic field charges to separate magnetic materials. …

An alkaline solution (0.1 M NaOH) favored the desorption of Cr (VI) from the magnetic biochar, and the removal of Cr (VI) still remained around 77.6% after four cycles of adsorption-desorption. The results showed that corncob derived magnetic biochar is a potentially efficient and recoverable adsorbent for remediation of heavy metals in water.