Preparation method of oxidized pellets with coarse-grain hematite as main raw material
A technology for oxidizing pellets and main raw materials, applied in the field of oxidizing pellets, can solve the problems of reduced equipment operation rate, increased production cost, wear and tear of grinding equipment, etc., and achieves low production cost, high quality of oxidized pellets, and adaptability strong effect
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[0022] Example 1
[0023] A preparation method of oxidized pellets with coarse-grained hematite as the main raw material. First, 60~64wt% of hematite powder, 26~30wt% of electrostatic precipitator ash in the steel smelting process, 2~4wt% of organic binder and 7~8wt% of water are mixed uniformly, and then pressed into shape. The ellipsoidal green spheres are then calcined at 1150~1170℃ for 22~30min to obtain oxidized pellets.
[0024] In this embodiment: the organic binder is prepared by mixing starch, inorganic sodium salt, borate and water in a mass ratio of 1:(0.04~0.09):(0.02~0.05):(4.0~4.5) ; Forming pressure is 10-20MPa.
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[0025] Example 2
[0026] A preparation method of oxidized pellets with coarse-grained hematite as the main raw material. First, 62~66wt% of hematite powder, 25~29wt% of iron ore concentrate, 2~4wt% of organic binder and 7~8wt% of water are mixed uniformly, and then pressed to form an ellipsoidal green ball ; Then the ellipsoid green spheres are calcined at 1150~1170℃ for 22~30min to obtain oxidized pellets.
[0027] In this example: the organic binder is prepared by mixing starch, inorganic sodium salt, borate and water in a mass ratio of 1: (0.05~0.10): (0.03~0.06): (4.1~4.6) ; Molding pressure is 12~22MPa.
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[0028] Example 3
[0029] A preparation method of oxidized pellets with coarse-grained hematite as the main raw material. First, 63~67wt% of pellets are returned to ore, 24~28wt% of electrostatic precipitator ash in the steel smelting process, 3~5wt% of organic binder and 6~7wt% of water are mixed uniformly, and then pressed to form The ellipsoid green sphere is then calcined at 1160~1180℃ for 18~27min to obtain the oxidized pellets.
[0030] In this example: the organic binder is prepared by mixing starch, inorganic sodium salt, borate and water in a mass ratio of 1:(0.06~0.11):(0.04~0.07):(4.2~4.7) ; Forming pressure is 14~24MPa.
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