Microwave roasting of siderite at 800 °C with different holding times and the catalytic combustion effects on anthracite are investigated.The heating rate curves indicate that siderite can be heated in microwave field, and the heating rate increases considerably when FeCO 3 almost decomposes and oxidizes to Fe 3 O 4 and Fe 2 O …
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 ...
In this paper, both low-grade refractory siderite-containing iron ore and high-grade single siderite phase iron ore are taken as experimental objects to systematically …
After magnetization roasting, the weakly magnetic iron minerals, including hematite, limonite and siderite, are selectively reduced or oxidized to ferromagnetic magnetite, which is relatively ...
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 …
Siderite roasting, also known as the thermal decomposition of siderite, is a complex process involving multistep reactions. Therefore, the reaction characteristics and mechanisms should be further investigated to elucidate and improve the magnetization …
The fluidization roasting process rapidly converted siderite to ferromagnetic magnetite, with the magnetite distributed on particle surfaces and internal cracks. CO 2 …
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 conditions of preheating at 550 °C for 30 s followed by magnetizing roasting at 550 °C for 60 s at …
Fluidized magnetization roasting is the proper process for refractory siderite resource; it is of great significance to enhance the competitiveness of domestic iron ore concentrate and ensure the safety of China's iron ore supply. ... The roasted ore structure of siderite after magnetization roasting was relatively loose, which was …
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 …
ABSTRACT Siderite ore (FeCO3) is an important iron ore resource that is widely distributed around the world. However, it is difficult to process using conventional methods owing to the low iron grade, easy sliming, and high impurity content. Based on the mechanism of thermal decomposition, the combination of metallurgy and processing is a promising …
The reaction of hematite and siderite in magnetization roasting process are shown in Equation (2), Equations (3), (4), respectively. When the siderite was used as a reductant in magnetization roasting, the main reaction equation is shown in Equation (5). According to the reaction equations, we can see that the alternative reductant of siderite ...
Based on the mechanism of thermal decomposition, the combination of metallurgy and processing is a promising method to process siderite ore. In this study, …
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 recover iron from siderite ...
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. A beneficiation process of one roughing, one sweeping, and …
The non-isothermal magnetization roasting process and isothermal magnetization roasting process of siderite ore were investigated using …
taining refractory siderite and hematite. This process has wide applicability because it is unlimited by the proportion of 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 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 ...
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 …
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].
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 simultaneously roasting and magnetic separation was developed to treat the low grade siderite and hematite ores without adding any …
However, the reduction roasting of siderite (FeCO 3) generates weakly magnetic wüstite, thus reducing iron recovery via weak magnetic separation. We …
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 …
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 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 ...
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 …
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 magnetic separation.We systematically studied and proposed the fluidized preoxidation-low-temperature …
The non-isothermal magnetization roasting process and isothermal magnetization roasting process of siderite ore were investigated using thermogravimetric (TG) analysis and a real-time infrared gas ...
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 ...
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 …
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 …
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 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 …
In the present study, a green magnetization roasting process was proposed by using siderite (FeCO 3) as the reductant.The influences of the siderite dosage, roasting temperature and roasting time on the magnetization roasting process were investigated. The saturation magnetization of roasted samples was analyzed by a …
