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The production method of Fe3O4

wallpapers Industry 2021-04-13
Hydrogen reduction method of α-iron oxide
Put high-purity micro-powdered α-Fe2O3 into the pan, and the powder layer should not be too thick. After putting the pan into the reaction tube, pass in high-purity nitrogen to completely replace the air. Then slowly feed the hydrogen saturated with water through the scrubber. The heating temperature is between 300 and 400°C (for example, 330°C). After confirming that the reaction is complete (usually 1 to 3 hours), cool it down, stop sending hydrogen, and replace it with nitrogen, then take out the sample. An insufficient amount of water vapor, excessive heating temperature, or excessive reduction will generate FeO, so care must be taken. Increasing the temperature of the scrubber can increase the amount of water vapor (40-60°C is appropriate). With needle-shaped α-FeO(OH) as the starting material, α-Fe2O3 is obtained by heating and dehydrating. With this α-Fe2O3, needle-shaped ferroferric oxide particles can be prepared. The black audiotape uses this ferroferric oxide as the tape recording medium.
 
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Iron scraps are reacted with sulfuric acid to obtain ferrous sulfate, and then caustic soda and iron oxide are added to perform an adduct reaction at 95-105°C to generate ferroferric oxide, which is filtered, dried, and pulverized to obtain iron oxide black.
 
Slow oxidation of ferrous hydroxide
By heating the aqueous solution containing ferrous hydroxide precipitation to above 70°C and performing slow oxidation, ferroferric oxide powder composed of fairly uniform regular octahedral or cubic single crystal particles with a rib length of about 0.2 μm can be obtained. Air bubbles can also be used as a means of oxidation. An oxidant like KNO3 can also be used.
 
Harber method
If you are proficient in the operation, you can get Fe3O4 with a stoichiometric composition of Fe3.00O4.00. In the Harber method, 220g 20% ​​ammonia water is added to 2.2L FeSO4·7H2O aqueous solution and boiled under the condition of cutting off the air (you can use a capillary Round bottom flask), add a concentrated aqueous solution containing 25.5g KNO3 to the boiling.
 
Alkali Method
Ferrous sulfate solution is oxidized by adding alkali or the solutions of iron salt and ferrous salt are mixed in a certain proportion and then added with alkali for precipitation to obtain ferroferric oxide.

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