What Are the Key Questions About Thermite Reactions?

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The discussion centers on three questions regarding thermite reactions. Firstly, it clarifies that when thermite is placed in water, it primarily produces steam rather than hydrogen. The thermite reaction, which involves iron oxide and aluminum, generates molten iron and aluminum oxide, with the latter floating as slag. To separate aluminum oxide from iron, it can be collected and heated to fuse into alumina, which can then be electrolyzed to obtain aluminum. However, achieving the necessary temperatures for this process, around 2000 °C, poses significant challenges, including the need for suitable containment and electrode materials that can withstand such high temperatures. The conversation also references Faraday's law of electrolysis to determine the electricity required for the separation process, but concerns about the risks involved in high-temperature operations are expressed.
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I have three questions about thermite.

1. Is hydrogen released when thermite is placed in water or is it just steam?

2. How can I separate the aluminum oxide from the iron after the reaction?

3. Can the aluminum oxide be split apart into oxygen and aluminum?Any knowledge would be greatly appreciated.

Thanks!
 
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First of all, thermite reaction.Fe_2O_3+Al \rightarrow Fe(molten)+Al_2O_3

1.) I can't see any hydrogen here. If you are placing it in water, its just steam. Thermite, as its name may suggest, is very exothermic, so much that the iron produced is actually produced in molten form.

2.) Iron is formed in molten form and Aluminium oxide floats on it as slag.

3.) You can collect all that oxide, heat them until they fuse (Alumina) they electrolyze it to obtain aluminium.
 
AGNuke said:
You can collect all that oxide, heat them until they fuse (Alumina) they electrolyze it to obtain aluminium.

Good luck heating it up to 2000 °C. We don't use cryolite (or its equivalents) as a flux without a reason.
 
How much electricity would I need to separate the two?

The aluminum would already be at 2500 degrees from the actual thermite reaction.
 
goleynik said:
How much electricity would I need to separate the two?

This one is simple - check Faraday's law of electrolysis.

The aluminum would already be at 2500 degrees from the actual thermite reaction.

It will be at 2500, but do you have something to contain it in? Do you have an electrode material capable of surviving so high temp?

Sorry, it doesn't sound like something we want to discuss here. Too risky for my liking.
 
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