This study investigates the properties of H2-reduced calcium-added bauxite residue, self-hardened pellets, and the feasibility of iron recovery through electrostatic and magnetic separation methods. The oxide pellets are prepared via a mixing of bauxite residue, calcite, and quicklime. The self-hardened pellets are reduced at 1000 °C with …

We are currently developing the magnetic roll or drum-type separator and the high gradient magnetic separator (HGMS) for applications to soil decontamination, liquid waste treatment, underground storage tank waste treatment and chemical processing residue …

The experimental process was presented in Fig. 1 and comprised three stages, including magnetization roasting of iron tailings, alkaline leaching of roasted products, and magnetic separation of leaching residue. The roasted ore was leached with NaOH solution to remove Si-Al gangue minerals, following a procedure that entailed …

In this paper, a novel process for beneficiation of metallic iron from nickel leaching residue and preparation of ceramsite from tailings by direct reduction–magnetic separation process is reported.

Magnetic separation was applied only to recover iron from the laterite ore after being treated by the selective reduction in which magnetite was produced. About 93.9 % of magnetite was upgraded ...

Enrichment of low-grade iron ore, removal of ferromagnetic impurities from large volumes of boiler water in both conventional and nuclear power plants, or the …

The magnetic iron phases in the roasting residue can be fractionated in a second stage through wet magnetic separation, forming a valuable iron concentrate and leaving a nonmagnetic residue ...

Consequently, Ag@Au CSNPs are ideal for further biometric binding and signal enhancement [24]. Magnetic separation is an effective and fast enrichment method that can improve the efficiency of SERS detection [25]. Thus, the noble metal-coated magnetic nanoparticles (MNPs) display magnetic separation and signal enhancement …

After magnetic separation, a 95% iron recovery was obtained. This study revealed that additives such as Na 2 CO 3, ... Interestingly, the resulting non-magnetic residue is expected to be Fe, Al and Na depleted, but Ca, Si, Ti and REEs-enriched. Thus, depending on the exact chemistry, it could be used for downstream metal extraction or …

@article{Samouhos2013GreekM, title={Greek "red mud" residue: a study of microwave reductive roasting followed by magnetic separation for a metallic iron recovery process.}, author={Michail Samouhos and Maria Taxiarchou and Petros Tsakiridis and Konstantinos Potiriadis}, journal={Journal of hazardous materials}, year={2013}, …

In the reductive roasting experiments, the roasting temperature, roasting time and concentration of CO were maintained in the ranges of 600–800 °C, 10–40 min and 2–12%, respectively. The material recovered after quenching was directly subjected to mechanical milling and magnetic separation. 2.5. Mechanical milling and magnetic …

Magnetic separation is an effective and fast enrichment method that can improve the efficiency of SERS detection [25]. Thus, the noble metal-coated magnetic nanoparticles (MNPs) display magnetic separation and signal enhancement features. In addition to protecting the core, the noble metal enclosure also increases stability and …

To recover iron oxides from bauxite residue, magnetic separation has been considered in several instances. However, because hematite and goethite are Fe(III) species with low magnetic susceptibility values of 1 and 0.4 × 10 −6 m 3 /kg respectively [ 2 ], high gradient superconducting magnets producing a magnetic intensity of more than …

Magnetic separation for recovering iron resources from acid-leaching tailings of laterite nickel ore through mineral phase transformation - ScienceDirect. Separation and …

We developed a magnetic solid-phase extraction method using Fe 3 O 4 @polydopamine (Fe 3 O 4 @PDA) as adsorbents, coupled with liquid chromatography-tandem mass spectrometry (LC–MS/MS), for the enrichment and quantification of trace matrine and oxymatrine pesticide residues in tea. The adsorbent was easily …

The scope of this work is to develop and optimize a reductive roasting process followed by wet magnetic separation for iron recovery from bauxite residue (BR). The aim of the roasting process is the transformation of the nonmagnetic iron phases found in BR (namely hematite and goethite), to magnetic ones such as magnetite, wüstite, …

The development and application of new materials for the extreme fluoride pollution problem has drawn increasingly wide attention. Here, Chinese medicine residue, FeSO 4.7 H 2 O, FeCl 3.6 H 2 O and Al(NO 3) 3 were used as raw materials to create an novel Al-loaded magnetic Chinese medicine residue-derived biochar (Al/Fe 3 O 4 …

Magnetic separation of iron from the leached residue. For magnetic separation tests, a Davis Tube (Dings Magnetic Separator Co., U.S.A.) (The mineral processing laboratory, IGP, NTNU) was operated in five magnetic fields of 800, 1000, 2500, 2800 and 3200 G keeping all other operating parameters constant. For each test, …

magnetic separation and pulsating high-gradient magnetic separation were, respectively, proposed to recover magnetite and limonite from the residue, and under the optimized conditions, a high-grade

Upon magnetic separation, the iron grade in the concentrate of clinker derived from bauxite residue 1# is only 78.90%, with an iron recovery rate of 87.18%. This is primarily due to the limited separation efficiency between the iron and slag components.

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 …

The rest are adjacent and wrapped intergrowths. Low-intensity magnetic separation and pulsating high-gradient magnetic separation were, respectively, proposed to recover magnetite and limonite from the residue, and under the optimized conditions, a high-grade magnetite concentrate assaying 64.05% Fe with 85.59% magnetite recovery …

type wet magnetic separator. The intensity of the magnetic current was set to 4 A, while the magnetic field strength was 1.28 T. The final products of the magnetic separation included magnetic iron con-centrate, nonmagnetic residues bearing NaAlO 2 and the filtrate. The iron concentrate was analyzed and the iron recovery and content of …

The experimental procedure of the process is shown in Fig. 2.The system consists of a quartz tube, a laboratory-scale tube furnace, a gas supply system, a bar mill, and a magnetic tube [22], [23].First, 30 g of acid-leaching tailings of laterite nickel ore was weighed into a quartz tube and noble gas (N 2) was introduced to exhaust the air from …

The resulting eluent was then mixed and evaporated to dryness while being gently streamed with nitrogen. The residue was re-dissolved in 1mL of initial mobile phase and filtered through 0.22μm membrane to inject into the HPLC-Q-Orbitrap S system for analysis. ... (right) after magnetic separation; The TGA curves (e), N 2 adsorption and ...

In addition, two wet low-intensity magnetic separation tests, with a fixed low-magnetic intensity of 350 G, were examined under 3% ( w / w ) and 10% ( w / w ) solid concentrations on a feed size of

Recovering iron from the bauxite residue (BR) is one of the long-standing challenges in the mining industry. However, there is a substantial lack of information in the literature regarding sample properties and iron extraction by reducing hydrogen. The present study aims at reducing a Greek BR using hydrogen, its characterization, and …

Magnetic Separation of Impurities from Hydrometallurgy Solutions and Waste Water Using Magnetic Iron Ore Seeding. Written …

Goethite (α-FeOOH) and calcium sulfate (CaSO4·2H2O) are the main solid constituents of the iron oxide residues in zinc hydrometallurgy by the goethite process. Impounding these residues in tailings ponds is costly to maintain and causes a great threat to the local environment. In this study, magnetic separation was applied to separating goethite …

A new method of solid-phase reduction magnetic separation with pyrite as a reducing agent was proposed in order to realize resource utilization of high iron bauxite residue while reducing environmental harm. FeS2 powder and high iron bauxite residue powder were uniformly blended and roasted in a closed environment. A magnetic …