Space is a good place for heating!?
I mean, the fact it's permanently near absolute zero, the fact it's in a vacuum, and that getting equipment to heat stuff into space would be ridiculously expensive?
May as well smelt it on the moon. Also, the useless stuff (e.g. sulphur) wouldn't be blasted into space along with the useful stuff (i.e. the iron).
(Space would be a good place for smelting because you could get very high temperatures on the cheap if you just shine a lot of light on your smelting material and then don't radiate it.)
This is thermo 101, if heat goes in and it doesn't go out then temperatures rise.
And then problems arise once you're done smelting. Besides, don't liquids not exist at zero pressure?
.Nice theories, but they seem to be assuming you want self-sustaining colonies and not much more.
Most sources of metal are in gravity wells, so either expansion will be stopped at some point or you'll need to get to a gravity well eventually.
Besides, making a large-scale lunar colony requires less resources than an equally-large floating space colony. Potentially much less.
Free-floating colonies aren't a bad thing, but you still need world-based colonies.
Not all gravity wells are created easily. Jupiter has a larger well then earth has a larger well then the moon. That's why the moon is a good source, earth is an okay source and Jupiter is basically impossible.
How is that relevant to my argument specifically against relying on orbital/free-floating stations?
You don't need world based colonies because people could easily live in space and commute to the moon to work in the mines. We aren't talking three day journeys like the Apollo program, the closest colony could be right in lunar orbit. Saying that you need a planetside colony is like saying you need the miners to live inside the iron mine. Maybe you want them to live near the mine surface but inside is just silly.
In that case, why bother with the orbiting station?
The gravity in space is even lower...
The gravity in space is whatever you want it to be. Artificial gravity is easy as pie for a large structure.
It's even easier on a planetary surface! Besides, most "health problems" from low gravity aren't much of a problem unless you return to a higher-gravity well.
Why would you want commerce and industry to be light 24/7? It wastes electricity.
Read what I wrote more carefully. The whole point is that you don't need a watt of electricity to provide all the light you want.
Starlight on half the outside, nothing on the inside.
The problem with space smelting is, you can't get rid of the heat...
Yes you can; just build a radiator. In space you can insulate with vacuum until the smelting is finished then connect it to your radiator bank which can exist in three dimensions. Keep in mind that a little patience goes a long way. Make your radiators able to survive high temperatures and then allow a couple weeks for the heat to smelt away. You can afford to be patient because you can just move the smelting equipment on to the next batch while you wait for the stuff to cool.
I'll take your word for it. It would still be as simple to smelt it on the Lunar surface, and cheaper to ship metal up than ore.
All these problems are just pretty basic engineering constraints that can be cheaply solved with an ounce of planning. Think outside the box a little here, we are talking speculation here so try to understand how things could be different before insisting they wouldn't work.
These ideas could work, but they're not the best.