Magnetic roasting system and process for powder of refractory iron ore

A technology of magnetized roasting and iron ore, which is applied in the field of roasting technology, can solve the problems that steam is difficult to be used effectively, the magnetized roasting plant is not practical, and it is difficult to find and use steam, etc., so as to achieve high heat utilization efficiency, reduce energy consumption, and improve efficiency high effect

Active Publication Date: 2012-07-11
深圳市中科九台资源利用科技产业股份有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Production practice shows that it is difficult to effectively use the steam produced in the magnetization roasting plant. If it is used for power generation, the amount of steam is too small and uneconomical, and it is difficult to find other effective ways to use steam in the magnetization roasting plant
Therefore, it is not practical for the magnetization roasting plant to recover the sensible heat of roasted iron ore powder in this way.

Method used

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  • Magnetic roasting system and process for powder of refractory iron ore
  • Magnetic roasting system and process for powder of refractory iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] See figure 1 . Taking the magnetic roasting process of refractory iron ore powder as an example, the two-stage cyclone cooler is used. The system of magnetic roasting of refractory iron ore powder consists of a silo 1, including a first-stage cyclone preheater 2, and a second-stage cyclone preheater. Multi-stage cyclone preheater of device 3 and three-stage cyclone preheater 4, cyclone dust collector 15, bag dust collector 16, screw conveyor 17, combustion chamber 5, feeder 6, by riser 7-1, a A circulating fluidized bed reactor 7 composed of a first-stage cyclone separator 7-2, a material leg 7-3 and a second-stage cyclone separator 7-4, a first-stage cyclone cooler 9, a second-stage cyclone cooler 8, a preheated gas A first-stage cyclone dust collector 10, a preheated gas two-stage cyclone dust collector 11, a screw discharger 12, a roasted ore cooling tower 13, a slurry pump 14, an air fan, a gas compressor, an induced draft fan 18 and a chimney 19 are combined.

[...

Embodiment 2

[0070] For the magnetization roasting system of the refractory iron ore powder, the first-stage cyclone cooler can also be used to carry out the magnetization roasting of the refractory iron ore powder, and the magnetization roasting system and magnetization roasting of the refractory iron ore powder The process is basically the same as in Example 1, except that when the first-stage cyclone is used for cooling, the inlet of the first-stage cyclone cooler 9 is connected with the outlet of the lower part of the material leg 7-3 and the outlet of the gas compressor through the pipeline respectively. The air port is connected, the gas outlet of the primary cyclone cooler 9 is connected with the air inlet of the preheated gas primary cyclone dust collector 10 through the pipeline, and the discharge port of the lower part of the primary cyclone cooler is connected with the screw discharger 12 through the pipeline. The feeding port is connected.

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Abstract

The invention belongs to the fields of chemical industry and metallurgy and in particular relates to a magnetic roasting system and process for powder of a refractory iron ore such as limonite, siderite, deposited hematite and the like by using a circulating fluidized bed. The powder of the iron ore is magnetically roasted by using a circulating fluidized bed reactor; the latent heat of unreacted reductive gas in roasting tail gas is released through combustion in a combustion chamber firstly, and then, heat is recovered through the heat exchange between a multistage cyclone preheater and the powder of a cold iron ore; and the sensible heat of the powder of a high-temperature roasted iron ore is recovered in a way that cold coal gas and the powder of the high-temperature roasted iron exchange heat in a cyclone cooler. The magnetic roasting system and process have the advantages of high magnetic roasting efficiency, high heat utilization efficiency in the roasting process and the like and can be used for reducing the energy consumption in the magnetic roasting process of the powder of the refractory iron ore and improving the economical efficiency in the magnetic roasting process of the powder of the refractory iron ore.

Description

technical field [0001] The invention belongs to the fields of chemical industry and metallurgy, and in particular relates to a system and a 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] With the continuous and rapid development of my country's national economy, the demand for mineral resources continues to increase significantly, and my country's domestic iron ore supply is seriously in short supply. In 2009, the amount of imported iron ore has reached 630 million tons, and the foreign dependence exceeds 60%. Excessive dependence on foreign iron ore makes my country's iron and steel industry controlled by others, endangers the healthy and stable operation of the national economy, and implies a huge iron ore supply crisis. The fundamental way to break through the above-mentioned resource supply crisis lies in the utilization of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10
Inventor 朱庆山张涛谢朝晖李洪钟陶玲侯宝林
Owner 深圳市中科九台资源利用科技产业股份有限公司
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