High-reducibility pellet and preparation method thereof
A technology of pellets and mass percentage, applied in the field of high reducing pellets and its preparation, can solve the problems of low strength of finished pellets, high preheating and roasting temperature, complex additive components, etc., achieve significant environmental benefits, reduce Fuel ratio, effect of improving pellet metallurgical properties
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Embodiment 1
[0033] The hematite concentrate is mixed with the dehydrated molten iron smelting sludge, the magnesium-containing additives and the binder at a mass percentage of 88%: 8%: 2.5%: 1.5%. The used hematite concentrate particle size is more than 75% ≤0.044mm, the molten iron sludge particle size is more than 90% ≤0.074mm, the magnesium-containing additive is 100% light burnt dolomite + 0% magnesia, and the magnesium-containing additive MgO≥35%, more than 80% of the particle size≤0.074mm. The ratio of carboxymethyl modified starch polymer compound and bentonite in the binder is 1 / 5. Then, the mixed material after mixing is moistened and ground for 9 minutes, and then pelletized and dried. After the green pellets are dried, the preheating temperature is 940℃, the preheating time is 15min, the roasting temperature is 1240℃, and the roasting time is 15min. Preheating and roasting, the compressive strength of the obtained preheated pellets is 600N·piece -1 , The compressive strength of...
Embodiment 2
[0035] The hematite concentrate is mixed with the dehydrated molten iron smelting sludge, the magnesium-containing additives and the binder in a mass percentage ratio of 90%:5%:4%:1%. More than 80% of the hematite concentrate particle size ≤0.044mm, more than 90% of the molten iron smelting sludge particle size ≤0.074mm, the magnesium additive is 80% light burnt dolomite + 20% magnesia, and the magnesium additive MgO≥45%, and the particle size ≤0.074mm is greater than 85%. The ratio of carboxymethyl modified starch polymer compound and bentonite in the binder is 1 / 3. Then, the mixed material is moistened and ground for 6 minutes, and then pelletized and dried. After the green pellets are dried, the preheating temperature is 970℃, the preheating time is 12min, the roasting temperature is 1280℃, and the roasting time is 10min. Preheating and roasting, the compressive strength of the obtained preheated pellets is 620N·piece -1 , The compressive strength of the fired pellets is 28...
Embodiment 3
[0037] The hematite concentrate is mixed with the dehydrated molten iron smelting sludge, the magnesium-containing additives and the binder in a mass percentage ratio of 91%: 3%: 5%: 1%. The hematite concentrate used is more than 85% with a particle size of ≤0.044mm, more than 95% of the molten iron smelting sludge with a particle size of ≤0.074mm, and the magnesium-containing additive is 75% light burnt dolomite + 25% magnesia. MgO≥45%, more than 90% of the particle size≤0.074mm. The ratio of carboxymethyl modified starch polymer compound and bentonite in the binder is 1 / 3. Then the mixed material after mixing is moistened and ground for 2 minutes, and then pelletized and dried. After the green pellets are dried, the preheating temperature is 980℃, the preheating time is 12min, the roasting temperature is 1280℃, and the roasting time is 15min. Preheating and roasting, the compressive strength of the obtained preheated pellets is 650N·piece -1 , The compressive strength of cal...
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