It is therefore easier to upgrade specularite using magnetic separation, compared with hematite. In contrast, limonite is the least susceptible to magnetic fields and therefore most difficult to recover using magnetic separation. Siderite contains only 48.2% Fe and hence it is impossible to achieve an acceptable Fe grade for siderite concentrates.
Beneficiation of High‐Phosphorus Siderite Ore by Acid Leaching and Alkaline Oxide Reinforced Carbothermic Reduction‐Magnetic Separation Process Chao Lv State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
The results show that the siderite recovery in magnetic separation increased from 26.9% to 88.8% after surface magnetization. ... The surface magnetite can provide magnetic force during the magnetic separation process to recover the roasted particles. The efficient iron recovery was realized through surface magnetization …
The carburization roasting treatment followed by the magnetic separation is an effective way to utilize low-grade siderite, in which the sodium sulfate additive plays an important role.
Simultaneous reduction roasting and magnetic separation of low-grade siderite ore with 36wt% Fe and hematite ore with 49wt% Fe produced an iron concentrate of 61.5wt% Fe at a recovery of 91.5%; no ...
The carburization roasting followed by magnetic separation is a feasible method to utilize low-grade siderite ore. In order to enhance the carburization efficiency and separation efficiency, high temperature reduction was carried out, and its mechanism was demonstrated by measuring carburization index, phase change, and microstructure …
In the magnetization roasting process, the weakly magnetic siderite can transform into strongly magnetic Fe 3 O 4 and γ-Fe 2 O 3 in different atmospheres, which can be easily recycled by magnetic separation, and the reactions are expressed using …
In this paper, a process of pre-oxidation and magnetization roasting followed by low-intensity magnetic separation and acid leaching (OMLA) was developed to …
The development and utilization of siderite is worldwide difficult problem; the conventional beneficiation methods only can get iron concentrate with iron grade …
Nowadays, the process of magnetization roasting followed by low-intensity magnetic separation is one of the most effective ways to realize the beneficiation of siderite ore [8][9][10][11].
Fig. 5 illustrates a schematic diagram of the experimental process for siderite ore. The equipment comprises two systems: the roasting system (on the right in Fig. 5) …
In order to develop limonite and decrease CO2 emissions, siderite is proposed as a clean reductant for suspension magnetization roasting (SMR) of limonite. An iron concentrate (iron grade: 65.92wt%, iron recovery: 98.54wt%) was obtained by magnetic separation under the optimum SMR conditions: siderite dosage 40wt%, …
A multi-stage magnetic separation process was used to analyze the beneficiation of roasted ore produced by CBMRP, and the beneficiation effect was …
Siderite ore is difficult to treat using conventional processing methods such as gravity, magnetic separation, and froth flotation owing to its low iron grade, complex mineral composition, and easy sliming in the grinding process. In this study, magnetization roasting in a low-oxygen atmosphere without carbon additives has been carried out for …
and weak magnetic separation. The weak magnetic separation of roasted ore is as follows. First, the roasted ore was milled (QM-3SP2, China) to the target particle size. Then, a standard Davis magnetic separat-or tube (d = 50 mm, CXG-99, China) was used to perform wet weak magnetic separation. The Fe and Fe2+ content of the sample was …
Realizing the large-scale development and utilization of siderite, a difficult iron ore reserve, has great practical significance in ensuring the supply of iron ore resources. Therefore, a new in-house conveyor bed magnetization roasting–dry cooling process was pilot-tested using low-grade siderite from the Daxigou iron ore mine. A …
Magnetization roasting is one of the most effective way of utilizing low-grade refractory iron ore. However, the reduction roasting of siderite (FeCO3) generates weakly magnetic wüstite, thus reducing iron recovery via weak magnetic separation. We systematically studied and proposed the fluidized preoxidation-low-temperature …
In this kind of process, the weakly magnetic iron minerals, such as hematite, limonite, goethite and siderite, are selectively oxidized or reduced to magnetite, which is much easier to enrich by ...
Compared with the process without high-temperature pretreatment, the iron grade of the magnetic separation concentrate after high-temperature pretreatment had increased by 0.98%, iron recovery rate had increased by 1.33%, and the phosphorus content in the leached residue had decreased by 0.12%.
After the grinding and magnetic separation process, an iron concentrate with 70.83% Fe and 0.05% P is obtained, which can be served as raw material for ironmaking. 1.
Nowadays, the process of magnetization roasting followed by low-intensity magnetic separation is one of the most effective ways to realize the beneficiation of …
to investigate the magnetization of siderite. Multi-stage magnetic separation processes were adopted to extract magnetite. The results show that simultaneously the iron carbonate in siderite decomposes, ... A multi-stage magnetic separation process was used to analyze the beneficiation of roasted ore produced by CBMRP, and
Low-intensity magnetic separation (LIMS) after magnetization roasting is an effective method to treat siderite [5,6,7,8,9,10,11,12,13]. In this process, weakly magnetic siderite and mixed hematite or limonite can be chemically converted into magnetite or magneto hematite, which is suitable for recovery using LIMS [14,15,16]. …
A magnetizing roast to reduce iron oxyhydroxides [e.g. goethite, FeO(OH)] and carbonates (e.g. siderite, FeCO 3) to magnetite, followed by a magnetic separation process, is a potential beneficiation method.
Experiments were conducted using a conveyor bed magnetization roasting process (CBMRP) to investigate the magnetization of siderite. Multi-stage magnetic …
Experiments were conducted using a conveyor bed magnetization roasting process (CBMRP) to investigate the magnetization of siderite. Multi-stage magnetic separation processes were adopted to ...
The magnetic properties of ore can be enhanced due to the selective conversion of hematite and siderite into magnetite. ... In addition, the advantages of reduction roasting followed by magnetic separation process over direct magnetic separation process is highlighted in detail. Enhancement of magnetization roasting of …
Abstract. During the roasting process, siderite (FeCO 3) transforms to magnetite (Fe 3 O 4) along with producing carbon monoxide (CO), but hematite (Fe 2 O …
A fluidized-bed magnetizing roasting–magnetic separation process was selected to treat this type of material. Phase transformations and microstructural changes in the product resulting from magnetizing roasting under different reducing gases (CO, H2, CO + H2) were clarified by vibrating sample magnetometry, X-ray diffraction, scanning …
A fluidized-bed magnetizing roasting–magnetic separation process was selected to treat this type of material. Phase transformations and microstructural …
Long-term practice has indicated that magnetization roasting combined with a magnetic separation process is one of the most promising methods for recycling refractory iron ore (Tang et al., 2020, Suthers et al., 2014, Rath et al., 2016a, Rath et al., 2016b). ... Fig. 4 and Table 5 indicate that limonite, siderite, kaolinite, and apatite in the ...