Modified spherical sponge iron for wastewater treatment and preparation method
A technology of sewage treatment and sponge iron, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, through adsorption, etc., can solve the impact of sponge iron specific surface area and activity, weaken the operability, storage and application difficulties of spherical sponge iron and other problems, to achieve the effect of being suitable for storage and use, not easy to harden, and low production cost
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Embodiment 1
[0020] Take iron fine powder, finely grind it to 150 mesh, add 0.5% diatomite to the weight of iron fine powder, mix evenly, add disc pelletizer, and make balls during the process of adding water, the diameter of the ball is 1-10mm; the ball is natural After drying, place it in a high-temperature roasting furnace, and oxidize and roast it at 1400 ° C for 30 minutes to obtain oxidized pellets; place the oxidized pellets in a reduction furnace, and pass 2 NL / min of H 2 , after 1h reduction, spherical sponge iron was obtained; stop passing H 2 , switch to 2NL / min CO gas carburizing for 30min, after cooling, it can be made into modified spherical sponge iron.
Embodiment 2
[0022] Take the iron oxide sheet, finely grind it to 180 mesh, add 1% bentonite to the weight of the iron oxide sheet, mix it evenly and add it to a disc pelletizer, and make pellets during the process of adding water, with a diameter of 1-10mm; the balls are naturally dried and placed in In a high-temperature roasting furnace, oxidize and roast at 1300°C for 60 minutes to obtain oxidized pellets; place the oxidized pellets in a reduction furnace, and feed 1NL / min of H at 700°C 2 , after 2h reduction, spherical sponge iron was obtained; stop passing H 2 , switch to 1NL / min CH 4 Gas carburizing for 60min, after cooling, it can be made into modified spherical sponge iron.
Embodiment 3
[0024] Take fine iron powder, finely grind it to 200 mesh, add 0.3% of diatomite and 0.4% bentonite binder accounting for the weight of the iron fine powder, mix well and add to the disc pelletizer, during the process of adding water, pellets are formed, and the diameter of the ball is The size is 1-10mm; the balls are naturally dried and placed in a high-temperature roasting furnace, and oxidized and roasted at 1200 ° C for 90 minutes to obtain oxidized pellets; the oxidized pellets are placed in a reduction furnace, and 3 NL / min h 2 , after 3 hours of reduction, a highly active spherical sponge iron was obtained; stop passing H 2 , switch to 3NL / minCO, CH 4 Gas carburizing for 90 minutes, after cooling, it can be made into modified spherical sponge iron.
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