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Synthetic Method of Ferric Oxide-Preparing Ferric Oxide from Waste Iron Slag

wallpapers Industry 2020-09-30

The waste iron slag is used as the primary raw material to react with industrial sulfuric acid to prepare iron trioxide, and calcium oxide is added to the waste liquid to generate calcium sulfate as a by-product. Scrap iron slag is produced by the steel pipe factory during the production process, due to the waste generated in the washing, cutting, and stretching process, about hundreds of tons are caused every year. It is placed in the factory and pollutes the environment due to wind and rain. Use acid to dissolve waste iron slag, control environmental pollution, use waste, prepare useful chemical products, and serve actual production.


The main component of waste iron slag is ferric oxide, which reacts with a specific concentration of sulfuric acid under stirring and heating to boiling conditions to produce ferrous sulfate and iron sulfate.

Drying and burning the obtained product can produce iron trioxide.

Preparation steps:

(1) Weigh 20g of scrap iron powder crushed through a 20-mesh sieve (weigh to 0.0001g) and 0.1% of the solubilizer in a three-necked flask with a stirring device, and add 8-9mol L of industrial sulfuric acid 300-350mL, Install reflux device and thermometer. Stir and heat until boiling. After the heat preservation reaction for 2 to 3 hours, filter while hot by decantation, and a small amount of residue can be used as a cement additive or fertilizer additive. The filtrate is aged and left overnight.

(2) Pour the aged precipitate and mother liquor into a filter funnel, filter under reduced pressure, and process the filtrate. The precipitate was filtered and washed with isopropanol for 2 to 3 times, and the filtrate was distilled to recover isopropanol. The residue is dried in a vacuum drying oven (or naturally dried), weighed, and then burned in a high-temperature furnace to obtain the product iron trioxide.

(3) The filtrate obtained above is neutralized by adding soda-lime, filtered under reduced pressure, and the resulting residue is CaSO4, which can be used by the manufacturer after being dried, and the filtrate produced is adjusted to pH 6-8 for discharge.

The development of this preparation technology solves the problem of the factory's floor space and waste pollution to the environment and solves the problem of poor disposal of waste iron slag. It is neutralized by adding a neutralizer, and the discharged filtrate is non-toxic and harmless, does not cause environmental pollution, and meets the increasingly stringent requirements of environmental protection.

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Tag: Ferric Oxide