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Study of Siderite Fluidized Magnetization Roasting and Magnetic Separation. January 2019. DOI: 10.1007/978-3-030-05955-2_7. In book: 10th International Symposium on High-Temperature Metallurgical ...
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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].
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Refractory iron ore is often discarded as tailings. This causes a great waste of iron resources. In this paper, the flash roasting-magnetic separation process was designed by combining the magnetic separation process of magnetite and the process mineralogy of iron tailings. The flash suspension roasting effects with 3–4 s roasting time …
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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 …
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It is therefore easier to upgrade specularite using magnetic separation, compared with martite and hematite. In contrast, limonite is less susceptible to magnetic fields and more difficult to recover using magnetic separation. Siderite contains only 48.2% Fe, and hence, it is impossible to achieve a high Fe grade for siderite concentrates.
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In this paper, the beneficiation of a low-grade hematite ore fines containing carbonates with magnetization roasting and magnetic separation was proposed and studied. The hematite and siderite are almost completely converted into magnetite by 8 wt% coal at roasting temperature of 800 °C for 8 min. Under the optimized conditions, a …
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The technology comprises magnetizing roasting of the materials in a weakly reducing atmosphere at 500–850 °C, resulting in conversion of non-magnetic iron into …
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Magnetic roasting followed by magnetic separation is also an alternative process to enrich iron by regulating the conversion of iron oxides to magnetite (Yu and Qi 2011; Yu et al. 2020). However ...
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weakly magnetic iron ore, such as siderite (FeCO3), hematite (Fe2O3), and limonite (Fe2O3·nH2O) [3]. In this process, weakly magnetic iron minerals are converted into strongly magnetic magnetite (Fe3O4) through roasting. Then, iron minerals are separated from the gangue through weak mag-netic separation to obtain iron concentrate …
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Siderite decomposed in the process of magnetization roasting, released CO and CO 2, and transformed into strongly magnetic magnetite. The SEM images …
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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]. …
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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 …
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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 ... siderite transformed from a weak magnetic mineral into a strongly magnetic mineral, which can realize iron recovery under a weak magnetic field. …
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The beneficiation of iron minerals and arsenic-bearing minerals from arsenic-bearing iron ores with a calcification-magnetizing roasting and low-intensity magnetic separation (CMR-LMS) process is investigated in this work. The results show that the process is successful in extracting iron minerals and eliminating arsenic-containing …
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Multi-stage magnetic separation processes were adopted to extract magnetite. The results show that simultaneously the iron carbonate in siderite decomposes, and magnetite is …
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This study presents a fluidization roasting technology for siderite-bearing iron ore without the use of carbon additives. Samples of Jingtieshan iron ore were subjected to fluidization magnetization roasting, and the effects of roasting temperature, time, and N2 flow rate on the magnetic separation performance were explored. An iron concentrate …
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The process of magnetization is a very complicated gas–liquid–solid three-phase reaction. Factors, such as temperature, alkalinity, reaction duration, stirring speed and oxidizing regents, possibly affect the magnetization process. ... The measurable indicator of this test is the recovery of siderite by the magnetic separation.
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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].
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Fig. 4 and Table 5 indicate that limonite, siderite, kaolinite, and apatite in the ore were pyrolyzed in the pretreatment stage. ... the feasibility of the high-efficiency separation of iron and phosphorus by reduction roasting and magnetic separation process (RRMSP) without a dephosphorization agent was studied. ...
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Keywords: siderite; magnetization roasting; in-situ infrared; kinetics; conveyor bed; magnetic separation 1. Introduction Siderite is a low-grade, difficult-to-sort iron ore comprising iron carbonate (FeCO3) as ... A multi-stage magnetic separation process was used to analyze the beneficiation of roasted ore produced by CBMRP, and
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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.
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Abstract. Refractory iron ore is often discarded as tailings. This causes a great waste of iron resources. In this paper, the flash roasting-magnetic separation …
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of the flash roasting-magnetic separation process show that a mixed iron concentrate containing 60.10% Fe with an iron recovery of 81.13% would be achieved after selective grinding and staged magnetic separation of the roasted ore. The result indicates that the flash suspension roasting effects with 3–4 s roasting time are achievable.
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Read this article. During the roasting process, siderite (FeCO 3) transforms to magnetite (Fe 3 O 4) along with producing carbon monoxide (CO), but hematite (Fe …
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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 3) needs CO to reduce into magnetite.The process of simultaneously roasting and magnetic separation was developed to treat the low grade siderite and hematite ores …
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However, the repulsive interaction between siderite and bubbles prevented siderite from adhering to the bubbles, resulting in poor flotation performance. Consequently, effective separation of hornblende from siderite was achieved by PTA, in which 90.46% of siderite was effectively recovered and 94.26% of hornblende was …
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In the magnetic separation tests, a Davis Tube Tester (model ø50) was employed. The roasted materials were ground to 85 wt% passing 38 μm in a ball mill (XMQ-Φ240 × 90), the flow rate of water was 1.2 L/min, the stroke rate was 75 strokes/min and the magnetic field intensity was set to 0.12 T.After the magnetic separation, the non …
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Magnetic separation is based on the difference in magnetic properties of mineral particles when subjected to a magnetic field. Magnetic separation is commonly used to separate diamagnetic minerals (such as fluorite and quartz) from ferromagnetic minerals (such as siderite), and from paramagnetic minerals (such as monazite, …
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The iron recovery increased by 5.77% compared with the results of the conventional magnetic separation. The high efficiency in phosphorus removal and iron recovery achieved by the MFS process may be attributed to the adequate liberation of iron particles and the increase in magnetic force on the iron mineral fines in the form of flocs …
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Magnetic separation technology plays an important role in upgrading such low-grade iron ores, because the magnetic separation process possesses the combined advantages of large capacity and low operating cost, as well as being environmentally friendly. This chapter first introduces the principles and recent advances in magnetic …
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T.J. Chun, D.Q. Zhu, and J. Pan, Simultaneously roasting and magnetic separation to treat low grade siderite and hematite ores, Miner. Process. Extr. Metall. ... An novel method for iron recovery from iron ore tailings with pre-concentration followed by magnetization roasting and magnetic separation, Miner. Process. Extr. Metall. Rev., …
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According to the magnetic analysis, SMR achieved the conversion of weak magnetic minerals to strong magnetic minerals, thus enabling the recovery of iron via magnetic separation. Based on the phase transformation analysis, during the SMR process, limonite was first dehydrated and converted to hematite, and then siderite …
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The final iron grade of the concentrate obtained after the multi-stage magnetic separation process was 62.80 wt.% with a recovery of 68.83%, which meets the requirements of steel smelting, as shown in Table 6. The middling ore III and IV obtained in the beneficiation process can be re-added into the beneficiation process to improve the …
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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 reduction …
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Magnetization roasting and low-intensity magnetic separation process. The siderite dosage is one of the most important factors during the magnetization roasting process. As there was some siderite in the refractory iron ore, the siderite content in this research referred to the total amount of siderite in the mixed sample.
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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 two …
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