Preparation method of oxidized pellets with coarse-grain hematite as main raw material
A technology of oxidized pellets and the main raw material, which is applied in the field of oxidized pellets, can solve the problems of reduced equipment operation rate, increased production cost, and wear of grinding equipment, and achieves low production cost, high quality of oxidized pellets, and adaptability strong effect
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Embodiment 1
[0023] A method for preparing oxidized pellets with coarse-grained hematite as the main raw material. First mix 60~64wt% of hematite powder, 26~30wt% of electrostatic precipitator ash in the iron and steel smelting process, 2~4wt% of organic binder and 7~8wt% of water, press molding, and make Form ellipsoidal green balls; then roast the ellipsoidal green balls at 1150~1170°C for 22~30 minutes 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) ; Molding pressure is 10~20MPa.
Embodiment 2
[0026] A method for preparing oxidized pellets with coarse-grained hematite as the main raw material. First mix 62~66wt% hematite powder, 25~29wt% iron concentrate, 2~4wt% organic binder and 7~8wt% water, press molding to make ellipsoid green ball ; Then roast the ellipsoidal raw balls at 1150-1170°C for 22-30 minutes to obtain oxidized pellets.
[0027] In this embodiment: 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.
Embodiment 3
[0029] A method for preparing oxidized pellets with coarse-grained hematite as the main raw material. First mix 63~67wt% of pellets returning to ore, 24~28wt% of electrostatic precipitator ash in the process of iron and steel smelting, 3~5wt% of organic binder and 6~7wt% of water, and press molding to make Form ellipsoidal green balls; then roast the ellipsoidal green balls at 1160~1180°C for 18~27 minutes to obtain oxidized pellets.
[0030] In this embodiment: 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) ; Molding pressure is 14~24MPa.
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