Download scientific diagram | XRD pattern of siderite. from publication: High-Efficiency Iron Extraction from Low-Grade Siderite via a Conveyor Bed Magnetization Roasting–Magnetic Separation ...
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promoted the conversion ratio of hematite and siderite to magnetite, thereby improving the conversion ratio in the fluidized-bed magnetizing roasting process. Keywords Siderite Hematite Mixed iron ore Fluidized-bed magnetizing roasting Kinetics Magnetite 1 Introduction Mixed iron ores are important iron-containing minerals.
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Reaction behavior and non-isothermal kinetics of suspension magnetization roasting of limonite and siderite, Int., Strengthening iron enrichment and dephosphorization of high-phosphorus oolitic ...
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During the suspension magnetization roasting process of siderite, hematite, limonite and other refractory iron ores, pores and cracks are generated in the raw ore particles and gradually develop. As the particle size increases, the pore size of the ore particles increases, and the reduction gas enters the interior for the reduction reaction ...
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The roasting of siderite ores in shaft furnaces is characterized by significant nonuniformity of the temperature and velocity fields at all levels of the charge. Heat exchange takes place at a low rate in the preheating zone, leading to the formation of flue gases with a temperature of about 230°C and displacement of most of these gases toward the area where …
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In this study, magnetization roasting in a low-oxygen atmosphere without carbon additives has been carried out for the treatment of siderite ore. An iron concentrate with an …
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The roasted ore structure of siderite after magnetization roasting was relatively loose, which was beneficial to improve the grinding effect and reduce the grinding cost. The results showed that with the extension of grinding time, the size of roasted ore became finer, the iron grade increased from 53.51 to 61.30%, while the recovery was ...
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In this process, the utilization of siderite suffers from the intense CO 2 emissions and resulting in serious environmental impacts, which violates the increasingly rigorous regulations on carbon emission control. Therefore, a low-carbon and environmentally friendly roasting and reduction route is highly desirable for the siderite utilization.
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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 …
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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 ...
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In this paper, a process of pre-oxidation and magnetization roasting followed by low-intensity magnetic separation and acid leaching (OMLA) was developed to separate and …
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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%, roasting temperature 700°C, roasting time …
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The tests for the regenerative roasting of siderite ores in the lab and semi-industrial conditions proved it possible to produce a metallized concentrate with a Fe and C content of 65 to 68 and 2 to 3%, respectively [18, 23, 24]. In this case, the desulphurization degree rises from 30–35% at oxidative roasting to 85–90% at regenerative ...
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It has been verified that efficient iron recovery was achieved by converting part siderite to magnetite through fluidization roasting. Compared with conventional magnetization roasting technology ...
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The conveyor bed magnetization roasting process (CBMRP, also known as suspension roasting) is a process that has been recently developed for the magnetization roasting of siderite employing micron-sized powder as a raw material that has been fully magnetized via roasting at 600–800 °C for 3–10 s under a reducing atmosphere.
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Efficient use of abundant low-grade siderite ores can potentially mitigate the shortage of iron ore in the iron and steel industry in China. In this work, the beneficiation of siderite fines containing high levels of carbonates was studied using a combined fluidized-bed magnetizing roasting process. The siderite was almost completely converted into magnetite …
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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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magnetization roasting of a siderite tailing (TFe 15.1%) from. Daxigou Iron Mine. After roasting at 740°C with 1.0 vol.% oxygen, the iron grade of ore can be upgraded to 53.3% with.
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The phase transformation and decomposition mechanism during the roasting process were evaluated. Siderite decomposed in the process of magnetization roasting, released CO and CO2, and transformed ...
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Magnetization Roasting is considered as an effective and typical method for the beneficiation of refractory iron ores. After magnetization roasting, the weakly magnetic iron minerals, including hematite, limonite and siderite, …
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Magnetization roasting at 750–780 °C for approximately 3.5 s in the CBMRP results in a magnetic conversion rate of >0.99% of the iron minerals in the siderite.
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In this study, a fluidization roasting technology for siderite-bearing iron ore without carbon additives is presented.
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Effects of coals on direct reduction roasting of siderite ore from Jiayuguan. Chin. J. Nonferrous Met., 22 (5) (2012), pp. 1462-1467 (In Chinese) View in Scopus Google Scholar. Yan et al., 2012b. S. Yan, T. Sun, Y. Xu. Transformation process of siderite under the conditions of coal-based direct reduction.
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Currently, magnetization roasting combined with magnetic separation has been proved to be an effective method for upgrading some refractory iron ores including the siderite ore [8].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 …
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The process can realize the simultaneous complete magnetization roasting of siderite and hematite to magnetite, and avoid the formation of wustite while satisfying the reduction of hematite, which has wide applicability. For Shaanxi low-grade siderite ore, compared with the conventional magnetization roasting process, the iron recovery rate of ...
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Focusing on the typical mixed iron ore of siderite (FeCO3) and hematite (Fe2O3), this paper analyzes the possible ways of magnetization roasting from the perspective of thermodynamics and ...
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siderite and hematite in iron ore and can avoid the roasting of siderite into wüstite. In particular, the behavior and path of siderite phase transformation during oxidation and reduction were investigated. 2. Experimental The system for the fluidized magnetization roasting ex-periment is shown in Fig. 1. The fluidized bed reactor and gas
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Siderite decomposed in the process of magnetization roasting, released CO and CO2, and transformed into strongly magnetic magnetite.
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After magnetization roasting, the weakly magnetic iron minerals, including hematite, limonite and siderite, are selectively reduced or oxidized to ferromagnetic magnetite, which is relatively ...
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Focusing on the typical mixed iron ore of siderite (FeCO3) and hematite (Fe2O3), this paper analyzes the possible ways of magnetization roasting from the perspective of thermodynamics and ...
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