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No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
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].
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 …
XRD patterns of roasted samples with different siderite dosage (roasting temperature: 700°C, roasting time: 10 min). ... In the magnetization roasting process, the heating of. raw materials is a ...
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 ...
have been developed and used in China as methods for the magnetization roasting of siderite [12,13]. The conveyor bed magnetization roasting process (CBMRP, also known as suspension roasting) is a process that has been recently developed for the Citation: Jiu, S.; …
The regulatory mechanisms of the main factors (siderite dosage, roasting temperature, and roasting time) on the self-magnetization roasting process were investigated. In-situ kinetic of the self-magnetization roasting process was analyzed by the infrared gas analyzer, and the phase transformation was investigated by in-situ X-ray diffraction ...
The fluidization roasting process rapidly converted siderite to ferromagnetic magnetite, with the magnetite distributed on particle surfaces and internal cracks. CO 2 was used during roasting to facilitate the transformation of siderite to magnetite. The iron recovery reached more than 98 % when the roasting time was only 2 min for sample S45 ...
The transformation route of siderite during the process of fluidization self-magnetization roasting is siderite (FeCO 3) → wustite (FeO) → magnetite (Fe 3 O 4). After roasting, more cracks were generated on the surface of the roasted product, which contributed to the reaction between gas and iron minerals during roasting.
Siderite ores are roasted in shaft furnaces, resulting from which carbonate decomposition occurs at a high level of heat consumption. In order to optimize the operating parameters of the roasting process and to determine the required fuel consumption, a thermodynamic analysis has been carried out, which made it possible to determine the initial ...
The technology currently used to process siderite ore includes an initial stage that involves the oxidative roasting of 13–80 mm fractions in shaft furnaces in a flow of flue gases (Fig. 1). This process yields roasted siderite concentrate (RSC) after crushing and magnetic separation of the commercial product.
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 …
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 under the optimum …
They are necessary to compare the material and heat balances of roasting process, which provide an opportunity to properly determine the fuel-consumption rate and work out recommendationsfor its lowering. ... which ensure the obtaining of roasted siderite ore in accordance with the requirements applicable to the quality of raw materials during ...
Magnetization roasting is one of the most effective way of utilizing low-grade refractory iron ore. However, the reduction roasting of siderite (FeCO 3 ) generates weakly magnetic wüstite, thus reducing iron recovery via weak …
The roasting of siderite (FeCO 3) was investigated to clarify the reaction mechanism in inert atmosphere using micro fluidized bed reaction analyzer coupled with on-line particle sampling (MFBRA-P). Thermodynamic results indicated that the reactions of 6FeO + CO 2 → C + 2Fe 3 O 4 and 3FeO + CO → C + Fe 3 O 4 are both possible to occur in the transformation …
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-stage weak magnetic separation …
In addition, in the actual process of siderite magneti-zation roasting, the non-isothermal conditions and isothermal conditions are likely to exist simultaneously. Thus, it is of great significance to understand the decomposition kinetics under these two conditions of magnetization roasting. The
The proposed fluidized preoxidation-low-temperature reduction magnetization roasting process can realize the efficient magnetization roasting utilization of low-grade refractory siderite ...
magnetization roasting process to roast the mixed samples of the siderite and hematite, achieving efficient recovery of iron minerals. And the reaction mechanism of self-magnetization roasting was studied (Figure 1) [18]. The suspension self-magnetization roasting provides a new way for the efficient and clean utilization of siderite ore.
The phase transformation and decomposition mechanism during the roasting process were evaluated. Siderite decomposed in the process of magnetization roasting, …
The non-isothermal magnetization roasting process and isothermal magnetization roasting process of siderite ore were investigated using thermogravimetric (TG) analysis and a …
Suspension magnetization roasting is a relatively novel method for treating siderite and hematite [].This has attracted widespread attention due to its excellent heat and mass transfer efficiency and low roasting energy consumption [] in comparison to previous magnetization roasting techniques used in shaft furnaces and rotary kilns.Scholars have conducted a series …
During the roasting process, siderite (FeCO3) transforms to magnetite (Fe3O4) along with producing carbon monoxide (CO), but hematite (Fe2O3) needs CO to reduce into magnetite. The process of ...
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 ...
roasting process were evaluated. Siderite decomposed in the process of magnetization roasting, released CO and CO 2,and transformed into strongly magnetic magnetite. The SEM imageshighlighted that ...
The resources of siderite are abundant in China, rotary kiln process is the mainstream technology of domestic baking industry at present, it has already realized industrial production in the field of magnetization roasting of siderite. But this method is prone to accretion, affecting the production rate, and has high energy consumption and ...
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 …
As shown by the experience of the roasting-and-dressing factory at the Bakal ore group for oxidative roasting of siderite ores in shaft furnaces, 15 to 17% of Fe 2 O 3 ores contained in the roasted ore are removed during reprocessing upon the magnetic separation of the roasted product in the tailings, which increases the amount of lost iron. To convert Fe 2 O …
However, the reduction roasting of siderite (FeCO 3) generates weakly magnetic wüstite, thus reducing iron recovery via weak magnetic separation. We systematically studied …
In the present study, a green magnetization roasting process was proposed by using siderite (FeCO3) as the reductant. The influences of the siderite dosage, roasting temperature and roasting time ...
