An innovative process for preparing ferronickel materials from laterite ore by reduction roasting-magnetic separation in the presence of additives was proposed,and the effect of additives on reducing roasting-magnetic separation of laterite ore and the technical parameters of roasting and magnetic separation were investigated.The results show …

This study investigated the effectiveness of natural pyrrhotite in immobilizing V(V) in aquifers and the feasibility of magnetic separation. The following conclusions could be drawn: • The ability of pyrrhotite to bioreduce V(V) to insoluble V(IV) was confirmed …

The dephosphorization process of high-phosphorus iron ore mainly includes roasting magnetic separation, strong magnetic separation, flotation process, selective agglomeration separation, combined process, and other methods . In recent years, a lot of research has been done on the theory and technology of phosphorus reduction in high …

The efficient and clean recycling of spent lithium-ion batteries (LIBs) is essential for resource conservation and environmental protection. This work proposes a facile and clean process for recovering of valuable metals based on microwave-assisted hydrogen reduction of spent cathode materials followed by grind-leaching and magnetic …

3.11.2.5 Magnetic Separation. 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.

A technique with coal-based direct reduction followed by magnetic separation is presented in this study for recovering and reusing iron otherwise wasted in vanadium tailings. Process parameters such as usage of additives, tailings/reductant/additives ratio, reduction temperature and time, as well as particle size …

The results show that the iron nuggets and alumina slag can be obtained in a short time through a semi-smelting reduction and magnetic separation process. The maximum particle size of iron nugget ...

The result demonstrates that the iron recovery and metallization rate of coal-based reduction-magnetic separation products increased first and then decreased, while the iron grade was basically constant. When the ore size was −2.0 mm, the iron grade, iron recovery and metallization rate were the highest with the values of 77.67%, 97.21% and ...

@article{Xu2023ApplicationOC, title={Application of Coal-based Direct Reduction-Magnetic Separation Process for Recycling of High-Iron-Content Non-Ferrous Metallurgical Wastes: Challenges and Opportunities}, author={Xianqing Xu and Zheng-qi Guo and De‐qing Zhu and Jian Pan and Cong-cong Yang and Si-wei Li}, …

The co-reduction roasting and grinding magnetic separation‒of seaside titanomagnetite and blast furnace dust was investigated with and without fluorite addition at a reduction roasting ...

The inner component of the structure 'vivianite[Fe(0)]' was ZVI, which made it possible for low intensity magnetic separation. After applying a magnetic separator with magnetic field intensity of 0.3 T, the vivianite[Fe(0)] was separated from liquid phase successfully and instantaneously. Besides, the iron 'core' can be magnetized to ...

2.3. Experimental Methods: Pyrolysis–Reduction Roasting and Magnetic Separation. All reduction roasting experiments were conducted in an electric furnace. Figure Figure2 2 shows a schematic diagram of the experimental device during pyrolysis–reduction roasting. A total of 10 g of an SHPS sample was thoroughly mixed …

2.2 was kept higher than the two magnetic poles. After the magExperimental Methods The experiment process is mainly divided into grinding, reduction roasting, and magnetic separation, and the ow diagram is shown in Fig. 2. The BFD and sawdust were ground separately by a rod mill (XMB-70, Φ75 × 148) at 400

Diboron trioxide and calcium fluoride were used as composite additives in the metallization reduction–magnetic separation experiment. The main steps …

In order to recycle iron from copper slag with total iron content (TFe) of 39.96%(mass fraction), a technique with lignite-based direct reduction followed by magnetic separation was presented.

This paper provided an effective way for a robust recovery of Ni from laterite ore by H2 reduction using sodium thiosulfate (Na2S2O3) as a promoter, which could improve the aggregation of Ni-Fe particles due to the capillary forces of FeS-Fe as well as the enhanced element migration by the liquid phase of sodium silicates during reduction.

Up to 49.0 ± 4.7 % of v was bio-removed by pyrrhotite and magnetic recovery. • pH had a strong effect on the magnetic reduction of V(V). • Functional microbes for V(V) reduction and pyrrhotite oxidation were identified. • Roles of genes for V(V) reduction and sulfate reduction were confirmed.

One-step magnetic separation would result in a significant waste of REOs. Therefore, a weak field intensity is used for the second-stage magnetic separation of the …

Therefore, based on previous studies, semi-molten reduction of ilmenite, followed by wet grinding and magnetic separation of slag from iron, was conducted to produce UGS with low-grade ores. This study aims to investigate the effect of Na 2 CO 3 on the semi-molten reduction of ilmenite and the separation behavior of slag from iron.

Calcination and H2 reduction at 800°C and single-pass magnetic separation at 4000 Gs were used. There was 95% recovery of the iron-free bauxite starting material, and the magnetic fraction ...

This indicates that the reduction rate and the aggregation of reduced metals are essential to provide a satisfactory recovery during grinding magnetic separation as high temperature is beneficial to reduction and the growth of metallic particles [19]. 3.3 Effect of reduction duration on selective reduction magnetic separation Under the ...

Fluid-magnetic micro-separation of vacuum reduction products. After the vacuum reduction products of spent lithium ion batteries were ground evenly, 0.5 g sample was weighed. The experiment was carried out under the optimal experimental parameters obtained from the simulation experiment. Other experimental factors were kept unchanged.

Coal-based reduction and magnetic separation behavior of low-grade vanadium-titanium magnetite pellets were studied in this paper. It is found that the metallization degree increased obviously with an increase in the temperature from 1100 °C to 1400 °C. The phase composition transformation was specifically analyzed with X-ray …

Currently, the majority of copper tailings are not effectively developed. Worldwide, large amounts of copper tailings generated from copper production are continuously dumped, posing a potential environmental threat. Herein, the recovery of iron from copper tailings via low-temperature direct reduction and magnetic separation was …

In a word, after carbothermal reduction and magnetic separation, high-grade magnetically separable ferronickel concentrates were successfully prepared by using laterite nickel ore, anthracite, and CaF 2 as raw materials, and the sample C1.4-F12 exhibited the highest iron grade of 63.96 wt% and nickel grade of 8.93 wt%.

In this work, a selective co-reduction and magnetic separation process was developed to economically and eco-friendly clean copper slag and synchronously upgrade nickel laterite. Through the innovative process, not only the valuable metals, such as Fe, Ni and Cu, can be recovered, but also the hazardous elements can be removed …

PDF | On Nov 18, 2021, Liwei Liu and others published Recovery of Fe and V via selective reduction–magnetic separation of vanadium-titanium magnetite concentrate | Find, …

The effects of reduction time on the metallized reduction–magnetic separation of low-grade saprolitic laterite ore was shown in Figure 7. As reduction time was prolonged from 2 to 6 h, the nickel recovery decreased from 76.02% to 66.66%; the iron recovery slightly increased from 79.88% to 81.60%, and then was declined to …

ABSTRACT Fe–P separation and the behaviors of Fe and P in separation process of high-phosphorus oolitic hematite ore from western Hubei province in China were studied. Various parameters, including reducing temperature and time, dosage of the pulverized coal, grinding fineness of magnetic separation feed, magnetic field intensity …

Reduction−Magnetic Separation of Pickling Sludge by Biomass Pyrolysis Reducing Gas. Yane Xu, Yuanfeng Shu, Yichao Wang, Xiaoling Ren, Xinqian Shu,* Xize Zhang, Huiyun …