Refractory poor iron ore pulsating fluidized bed magnetizing roasting device and roasting method
A magnetic roasting and fluidized bed technology, which is applied in metallurgy and chemical industry, can solve the problem of wide distribution of iron ore powder residence time, reduce reaction time and roaster reactor volume, and reduce total heat and mass transfer resistance , The effect of saving fixed investment
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[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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