Magnetization roasting technique system for refractory iron ore powder and roasting technology

Abstract

The invention belongs to the fields of chemical engineering and metallurgy and in particular relates to a process system which adopts a circulating fluid bed to carry out magnetization roasting on limonite, siderite, sedimentary hematite and other refractory iron ore powder bodies. The process system adopts a high-efficiency low-resistance reactor of the circulating fluid bed to carry out the magnetizing roasting to the iron ore powder body; firstly, roasted tail gas in a combustion chamber releases latent heat of unreacted reducing gas through combustion; secondly, the roasted tail gas exchanges heat with the cold iron ore powder body through a multilevel cyclone preheater to reclaim heat; and finally a fluidizing cooler is adopted to reclaim sensible heat of high-temperature roasting ore. The process system has the advantages of high magnetizing roasting efficiency and full heat reclaiming and utilization in the roasting process and the like, can reduce energy consumption of the refractory iron ore powder body in the process of magnetizing roasting and improve the economical efficiency of the refractory iron ore in the process of magnetizing roasting.

Description

technical field [0001] The invention belongs to the fields of chemical industry and metallurgy, and in particular relates to a process system and roasting process for magnetizing and roasting refractory iron ore powders such as limonite, siderite and sedimentary hematite by using a circulating fluidized bed. Background technique [0002] 97% of my country's iron ore reserves are lean ore, including nearly 10 billion tons of refractory iron ore including limonite, siderite, and sedimentary hematite. Even if the beneficiation process combining gravity separation, flotation and strong magnetic separation is adopted, it is difficult to achieve effective separation. It has been proved to be an effective separation method for the above-mentioned minerals by reduction roasting (also known as magnetization roasting) to convert the above-mentioned weakly magnetic iron oxides into strong magnetic artificial magnetite, followed by weak magnetic separation. The research and development ...

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Problems solved by technology

[0004] The iron ore magnetization roasting process is an energy-consuming process. The energy utilization efficiency of the whole process determines the economy of the process. The existing process only uses the sensible heat of the roasting tail gas, and does not make full use of the unreacted reduction in the roasting tail gas. Latent heat of gas (CO, H 2 、CH 4 chemical energy), and at the same time, the large amount of sensible heat contained in high-temperature roasted ore has not been recovered or fully recovered

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