Ferro-manganese oxidized ore fluid bed roasting system and method
A technology for fluidized roasting and iron-manganese oxide ore, applied in the fields of metallurgy and mineral processing, can solve the problems of lack of high-efficiency and low-consumption fluidized bed roasting system, avoid secondary oxidation and roasting process failure, high magnetic separation Recovery, effect of sufficient reaction residence time
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Embodiment 1
[0037] Such as figure 1 As shown, a fluidized roasting system for iron-manganese oxide ore includes a feed bin, a dryer, a cyclone preheater, a fluidized roaster, a reducing gas cooler, an indirect water cooler and a discharge bin.
[0038] Described dryer comprises tail gas burner 13, Venturi airflow dryer 2, dry cyclone separator 3 and bag filter 4, and described cyclone preheater comprises two-stage preheating cyclone; Described fluidized roaster comprises The roasting furnace body 7 and the roasting cyclone separator 8; the reducing gas cyclone wind cooler includes a multi-stage reducing gas cooling cyclone; wherein, the discharge port of the feed bin 1 is connected with the feed port of the Venturi airflow dryer 2, and the venturi The air outlet at the top of the airflow dryer 2 is connected to the air inlet of the drying cyclone separator 3, the air outlet at the top of the drying cyclone separator 3 is connected to the air inlet of the bag filter 4, and the outlet at th...
Embodiment 2
[0048] Adopt the fluidized roasting system of above-mentioned iron-manganese oxide ore to carry out the fluidized roasting method of iron-manganese oxide ore as follows:
[0049] The iron-manganese oxide ore powder is stored in the feed bin and enters the Venturi air dryer to be dehydrated and dried by the hot flue gas, and then separated from the gas and solid by the drying cyclone separator. The dried ore powder after gas-solid separation and the dust collected by the bag filter The dry ore powder enters the cyclone preheater together. In the multi-stage preheating cyclone, the ore powder and the hot tail gas of the roaster undergo gas-solid countercurrent heat exchange to raise the temperature. The heated hot mineral powder enters the roaster body and the reducing gas for hematite phase The magnetization roasting reaction and the reduction reaction of manganese dioxide, the reduced ore powder entrained by the air flow is separated from the gas and solid by the roasting cyclo...
Embodiment 3
[0052] The present invention is used to process iron-manganese co-associated oxide ore powder with iron grade TFe of 40.2% and manganese grade TMn of 19.7%, with a particle size of 0.037-1mm, of which 0.074mm accounts for 20%. Iron oxide in ore powder is hematite phase Fe 2 o 3 Existence, manganese oxide as manganese dioxide phase MnO 2 exist. Free water content 10%.
[0053] First, the fine ore is sent from the silo to the Venturi air dryer to be dehydrated and dried by the hot flue gas. After drying, the temperature of the hot flue gas tail gas is 120°C, and the free water content of the fine ore after dehydration is less than 1%. The powdered ore then goes through the two-stage cyclone preheater to exchange heat with the reduction tail gas to raise the temperature, and then enters the turbulent fluidized bed at 520°C for magnetization reduction roasting with producer gas for 30 minutes. Producer gas composition is 20%CO+11%CO 2 +17%H 2 +1%CH 4 +48%N 2 +5%H 2 O. Re...
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