Fluidization characteristics of a U-type reduction chamber in a suspension roaster

Tang, Zhidong; Han, Yuexin; Gao, Peng; Li, Erlei

doi:10.1016/j.powtec.2018.12.088

Cited by 16 publications

(3 citation statements)

References 31 publications

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“…This has attracted widespread attention due to its excellent heat and mass transfer efficiency and low roasting energy consumption [ 4 ] in comparison to previous magnetization roasting techniques used in shaft furnaces and rotary kilns. Scholars have conducted a series of studies on the suspension magnetization roasting technology used on low-grade refractory iron ores, such as siderite, hematite, and limonite [ 5 , 6 , 7 , 8 , 9 ]. The magnetization roasting conditions of siderite impact the quality of roasting and determine the magnetic separation effect of the roasted ore.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Washability of Roasted Suspended Siderite Ores

et al. 2022

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Steel is one of the most important industrial materials, which mainly comes from the smelting of iron ore. In view of the huge steel consumption every year, the exploitation of vast reserves of siderite ores is significant for improving the self-sufficiency rate of iron ore resources and ensuring the strategic security of the iron and steel industries. This paper investigated the influence of temperature, time, and other parameters on the magnetic properties of roasted siderite ores using the method of suspended roasting and analyzed the washability of roasted ores under weak-magnetic-field conditions using the magnetic separation tube experiment. The findings of the study explained the iron phase transformation process, i.e., FeCO3 was transformed into Fe3O4 by suspension magnetization roasting. Furthermore, the saturation magnetization of the roasted ore increased in due time at a constant temperature range of 550–750 °C and a roasting time of less than 5 s. It also increased with increasing temperature and constant time. The roasted ore achieved the best magnetic characteristics after roasting at 750 °C for 5 s. After low-intensity magnetic separation, the iron grade of the concentrate changed to 55.12%, with a recovery rate of 90.34%. The study results provide a reference for the development and application of siderite suspension magnetization roasting technology.

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Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Washability of Roasted Suspended Siderite Ores

et al. 2022

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“…Gao et al (2019) proposed a pressure drop model aiming to predict the pressure of reduction chamber during the suspension magnetization roasting process of iron ores. Tang et al (2019) investigated the fluidization characteristics of particles in reduction chamber of suspension roaster and found that fluidization velocity was seriously affected by particle size and the aeration velocity.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size on reduction kinetics of hematite ore in suspension roaster

Gao¹,

An²,

Li³

et al. 2020

Physicochem. Probl. Miner. Process.

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Suspension magnetization roasting followed by magnetic separation is an innovative and effective way to recover iron from refractory iron ores, and the particle size of the ore greatly affects the roasting index. To identify the effect of particle size on the reduction kinetics for the transformation of hematite to magnetite, a high-purity hematite ore with different size fractions were isothermally reduced using a suspension roaster. The pure hematite ore was divided into-1000+500 µm,-500+150 µm,-150+74 µm,-74+37 µm and-37 µm size fractions, while the gas mixture of CO and CO2 with a volume ratio of 1:4 was used as reductant. The results showed that the most suitable mechanism function for the reduction of-37 µm size fraction hematite ore is the Avrami-Erofeev model. In the case of-500+37 µm size fraction, the reduction process can be described by first-order chemical reaction model. For-1000+500 µm size fraction, the reduction of hematite ore is restricted by the second-order chemical reaction. In addition, scanning electron microscopy (SEM) analysis results demonstrated that the transformation of hematite particles to magnetite is in accordance with the characteristics of shrinking core model. The phase transformation primarily occurs at the edge of hematite particles and then develop towards the inner side of particles. The findings of this paper provide a theoretical basis for the development and utilization of refractory hematite ore via suspension magnetization roasting technology.

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“…Based on these facts, a great deal of research has been carried out by researchers on the efficient utilization of complex refractory iron ore resources using fluidized magnetizing roasting technology, which greatly shortens the roasting time, improves the roasting efficiency, and reduces the cost of beneficiation. Furthermore, it would be beneficial to promote the self-sufficiency rate of iron ore and get rid of the shackles of foreign mining giants [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Fluidized bed roasting technology in iron ores dressing in China: A review on equipment development and application prospect

Tang

Gao

Han

et al. 2019

J min metall B Metall

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Due to the undesirable characteristics of iron ore resources in China, it is necessary to utilize refractory iron ores resources with high efficiency. The mining and mineral processing costs are usually high. The supply of domestic iron ores in China has been in serious shortage for a long time. Therefore, the development and utilization of complex and refractory iron ore resources are extremely urgent. Magnetizing roasting followed by magnetic separation is an important method for the beneficiation of low grade iron ores. More attention has been paid to fluidized bed magnetizing roasting rather than shaft furnace and rotary kiln roasting in recent years. In this paper, the main characteristics of fluidized bed magnetizing roasting technology and the development process of its application in the beneficiation of refractory iron ores are introduced. The research status of several typical fluidized bed roasting processes and equipment in China are also summarized. Moreover, the application prospect of the technology for efficient utilization of low grade hematite, siderite, and limonite ores, as well as iron containing tailings, is analyzed.

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Fluidization characteristics of a U-type reduction chamber in a suspension roaster

Cited by 16 publications

References 31 publications

Magnetic Properties and Washability of Roasted Suspended Siderite Ores

Magnetic Properties and Washability of Roasted Suspended Siderite Ores

Effect of particle size on reduction kinetics of hematite ore in suspension roaster

Fluidized bed roasting technology in iron ores dressing in China: A review on equipment development and application prospect

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