Method for controlling redox atmosphere of rotary kiln
An oxidizing atmosphere and rotary kiln technology, applied in the field of metallurgy, can solve problems such as kiln ring formation, high roasting temperature, and insufficient oxidation of vanadium components, and achieve the effects of avoiding material sintering and reasonable energy utilization
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Embodiment 1
[0025] by Φ Take the 3.5m×90m vanadium slag oxidation and roasting rotary kiln as an example, the initial feeding volume is 20t / h:
[0026] (1) Mix vanadium slag and sodium salt evenly and thoroughly, and enter the rotary kiln from the kiln tail;
[0027] (2) Gas is blown into the kiln head of the rotary kiln, and the wind is drawn from the tail of the rotary kiln to roast the mixed raw material powder in the rotary kiln. The roasting temperature is 650°C, and the roasting time is 5 hours; blower and the same number of burners, the blowing volume is 1000 m 3 / h, blowing air to support combustion, and the exhaust gas is discharged from the rotary kiln through the exhaust channel at the end of the rotary kiln;
[0028] The blowing gas volume in the kiln is 0.5 times of the gas volume; the gas flow rate is 4000m 3 / h, the ratio of raw material feeding amount to 200;
[0029] (3) Inside the kiln body, redox agents are added to the material to extract vanadium tailings, and the...
Embodiment 2
[0033] by Φ Take the 4.5m×100m vanadium slag oxidation and roasting rotary kiln as an example, the initial feeding volume is 25 t / h:
[0034] (1) Mix vanadium slag and sodium salt evenly and thoroughly, and enter the rotary kiln from the kiln tail;
[0035] (2) Gas is blown into the kiln head of the rotary kiln, and the wind is drawn from the tail of the rotary kiln to roast the mixed raw material powder in the rotary kiln. The roasting temperature is 800°C, and the roasting time is 3 hours; 20 blowers and an equal number of blowers are installed on the kiln body. The burner is used to blow air to support combustion, and the exhaust gas is discharged from the rotary kiln through the exhaust channel at the end of the rotary kiln;
[0036] The blowing section is numbered from 1# to 4# from the kiln tail to the kiln head, and 3 blowers are installed on the 1# blowing section, and the blowing volume is 900 m 3 / h, 8 blowers are installed on the 2# blowing section, and the blowin...
Embodiment 3
[0042] by Φ Take the 4.5m×100m vanadium slag oxidation and roasting rotary kiln as an example, the initial feeding volume is 25 t / h:
[0043] (1) Mix vanadium slag and sodium salt evenly and thoroughly, and enter the rotary kiln from the kiln tail;
[0044] (2) Gas is blown into the kiln head of the rotary kiln, and air is drawn from the tail of the rotary kiln to roast the mixed raw material powder in the rotary kiln. The roasting temperature is 850°C and the roasting time is 2.5 hours; 5 blowers and an equal number of blowers are installed on the kiln body. The burner is used to blow air to support combustion, and the exhaust gas is discharged from the rotary kiln through the exhaust channel at the end of the rotary kiln;
[0045] The blowing section is numbered from 1# to 3# from the kiln tail to the kiln head, and a blower is installed on the 1# blowing section, and the blowing volume is 600 m 3 / h, 3 blowers are installed on the 2# blowing section, and the blowing volume ...
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