A method for preparing green pellets in a rotary hearth furnace containing iron-containing dust
A rotary hearth furnace, dust technology, applied in the direction of furnace, hearth type furnace, furnace type, etc., can solve the problems of poor strength and low green pellet density
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[0021] like figure 1 As shown, a method for preparing green pellets in a rotary hearth furnace containing iron-containing dust of the present invention may include the following steps in specific practical operations:
[0022] 1) The mixture is evenly and continuously sprinkled on the pelletizing disc of the pelletizing machine through the belt 1, and at the same time, continuously sprays water to humidify to make small pellets with a diameter of 1-5mm;
[0023] 2) The small pellets made in step 1) fall on the belt 2 under the action of inertia, and are transported to the intermediate warehouse;
[0024] 3) The small balls coming out of the intermediate warehouse fall into the ball pressing machine and are pressed into the green balls required for production.
Embodiment 1
[0026] Iron-containing raw materials (iron-containing dust accounts for 40%) and binder (calcium-based bentonite accounting for 5% of the mass of iron-containing raw materials or sodium-based bentonite accounting for 2.5% of the mass of iron-containing raw materials) composed of iron-containing dust and iron ore powder The formed mixture is evenly and continuously sprinkled on the pelletizing disc through the belt 1, and at the same time continuously sprays water to humidify, and makes small balls of 1 mm to 5 mm, and the water content of the small balls is controlled at 7% to 10%. The action falls on the belt 2 and is transported to the intermediate warehouse; the small balls coming out of the intermediate warehouse fall into the ball pressing machine and are pressed into the green balls required for production. The green ball density is increased by 52%, the green ball strength is increased by 44%, and the broken ball rate is reduced by 78%.
Embodiment 2
[0028] Iron-containing raw material (70% of iron-containing dust) and binder (calcium-based bentonite accounting for 10% of the mass of iron-containing raw material or sodium-based bentonite accounting for 5% of the mass of iron-containing raw material) composed of iron-containing dust and iron ore powder The formed mixture is evenly and continuously sprinkled on the pelletizing disc through the belt 1, and at the same time continuously sprays water to humidify, and makes small balls of 1 mm to 5 mm, and the water content of the small balls is controlled at 7% to 10%. The action falls on the belt 2 and is transported to the intermediate warehouse; the small balls coming out of the intermediate warehouse fall into the ball pressing machine and are pressed into the green balls required for production. The density of green balls is increased by 63%, the strength of green balls is increased by 65%, and the rate of broken balls is reduced by 62%.
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