Method for manufacturing metallurgic composite pellet by using different binders and two-step pelletizing way
A composite pellet and binder technology, applied in the field of pelletizing, can solve the problems of low iron grade of inorganic binder pellets, and failure of preheating strength of organic binder pellets to meet industrial requirements, etc.
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Embodiment 1
[0023] Raw material ratio: the proportion of inorganic binder for iron-containing materials in the pellet core is 0.5%, and the amount of added water is 8%, the ratio of organic binder for iron-containing materials in the pellet shell is 0.1%, and the amount of added water is 8%. The ratio of pellet core to shell iron-containing raw materials is 1:2.
[0024] Ball making method: disc pelletizing machine or pelletizing machine
[0025] Preheating temperature and time: 900°C, 30min
[0026] Calcination temperature and time: 1200℃, 40min
[0027] Pellet size: 4mm for raw pellets; 8mm for finished pellets
Embodiment 2
[0029] Raw material ratio: the proportion of inorganic binder for iron-containing materials in the core of pellets is 1.5%, and the amount of water added is 10%. The ratio of pellet core to shell iron-containing raw materials is 1:3.
[0030] Ball making method: disc pelletizing machine or pelletizing machine
[0031] Preheating temperature and time: 930°C, 20min
[0032] Roasting temperature and time: 1230°C, 30min
[0033] Pellet size: 5mm for raw pellets; 10mm for finished pellets
Embodiment 3
[0035] Raw material ratio: the proportion of inorganic binder for iron-containing materials in pellet core is 2.5%, and the amount of added water is 12%. The ratio of organic binder for iron-containing materials in pellet shell is 0.7%, and the amount of added water is 12%. The ratio of pellet core to shell iron-containing raw materials is 1:4.
[0036] Ball making method: disc pelletizing machine or pelletizing machine
[0037] Preheating temperature and time: 960°C, 15min
[0038] Roasting temperature and time: 1260°C, 25min
[0039] Pellet size: 6mm for raw pellets; 12mm for finished pellets
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