Refractory poor iron ore pulsating fluidized bed magnetizing roasting device and roasting method

A magnetized roasting and fluidized bed technology, which is used in the chemical and metallurgical fields, can solve the problems of wide residence time distribution of iron ore powder, reduce the reaction time and the volume of the roaster reactor, narrow the residence time distribution, and save fixed time. effect of investment

Inactive Publication Date: 2012-01-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0013] Aiming at the shortcomings of the existing fluidized bed magnetization roasting, the present invention proposes a process and device for blast furnace gas, coke oven gas and coal gasification gas combustion coupling fluidized bed magnetization roasting technology - Rick tube type pulsating fluidized bed magnetization Roasting device and roasting method to effectively destroy and suppress undesirable phenomena such as "channeling", "dead zone" and "short circuit" in fluidized bed magnetization roasting and excessively wide residence time distribution of iron ore powder in the reactor The problem

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  • Refractory poor iron ore pulsating fluidized bed magnetizing roasting device and roasting method
  • Refractory poor iron ore pulsating fluidized bed magnetizing roasting device and roasting method

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Embodiment 1

[0038] A pulsating fluidized bed magnetic roasting method for refractory lean iron ore, the method is coal gas, for example, the calorific value is greater than 850Kcal / Nm 3 The blast furnace gas, coke oven gas or coal gasification gas is compressed by the gas compressor 17 and preheated by the iron concentrate cooler 14, and the preheated air from the gas-gas heat exchanger 9 passes through the acoustic decoupling chamber 4 together into the pulsating fluidized bed for partial combustion, and the heat generated makes the temperature of the magnetization roasting reactor reach 500°C to 950°C. In this range, the weakly magnetic Fe 2 o 3 is rapidly reduced to strongly magnetic Fe 3 o 4 , and then high-quality iron concentrate (grade > 70%, iron recovery > 90%) can be obtained by magnetic separation in a weak magnetic field. After the reaction, the high-temperature roasted ore undergoes gas-solid separation through the cyclone separator 5 and enters the iron concentrate cooler...

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Abstract

The invention relates to a refractory poor iron ore pulsating fluidized bed magnetizing roasting device and a refractory poor iron ore pulsating fluidized bed magnetizing roasting method. Iron ore powder is magnetized and roasted by adopting a pulsating fluidized bed formed by direct coupling of Rick tube type pulsating combustion and a fluidized bed. The iron ore powder is preheated by an ore heater (6) in a bin (7) and then delivered to a roasting furnace (1), the roasting exhaust is cooled by the ore heater (6) and then delivered to a burner (8) and burnt, and the burnt exhaust is cooled by a gas-gas pre-heater (9), delivered to a bag-type dust remover (10) and then discharged to the atmosphere. Sensible heat of high-temperature iron ore concentrate is reclaimed by an ore cooler (14). The device has the advantages of simple system, compact structure, low energy consumption, reduced resistance, short roasting time and the like; and by using the device and the method, poor phenomena of channeling, dead zone, short circuit and the like of common fluidized bed magnetizing roasting and the problem of over wide residence time distribution of a reactor are effectively solved, and the roasting quality and the roasting efficiency are improved.

Description

technical field [0001] The invention relates to a pulsating fluidized bed magnetization roasting method for refractory iron oxide ore powder and a device using the method, belonging to the fields of chemical industry and metallurgy. Background technique [0002] China is a country rich in iron ore resources, but most of them are low-grade (average about 30%) complex and refractory iron ore (including limonite, hematite, etc.). It is difficult to effectively separate these complex and refractory iron ores by separation, flotation and their combined processes. In recent years, due to the rise in iron ore prices and the tight supply of domestic iron ore concentrates, a large number of low-grade iron ore resources that cannot meet the requirements of the iron and steel industry have not been effectively utilized. Therefore, it is necessary to develop an effective low-grade iron ore separation method with the device. [0003] Magnetization roasting has been proven to be feasibl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10
Inventor 汤根土胡万起李竹川王晓岚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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