XPost: sci.space.policy, sci.physics   
      
   In sci.physics Sjouke Burry  wrote:   
   > On 15.10.16 17:25, Serigo wrote:   
   >> On 10/15/2016 5:34 AM, Fred J. McCall wrote:   
   >>> jimp@specsol.spam.sux.com wrote:   
   >>>   
   >>   
   >>>>   
   >>>> So how much to put about 25 of these on Mars so you can convert dirt   
   >>>> to structural steel?   
   >>>>   
   >>>   
   >>> Why in the hell would you need 32 MW of power to make steel?  Total   
   >>> power required to make a ton of steel from ore is around 5 MW-hrs.   
   >>> You'd size your operation based on the power you had available and how   
   >>> much steel you need.   
   >>>   
   >>>   
   >>   
   >> Wrong again.  you skipped over the part where you get ore from dirt, how   
   >> much energy is that ?   
   >>   
   >> AND you skipped over the fact that the steel making facility is built   
   >> and operated in a vacuum, add in those costs in terms of energy, and   
   >> cleaning the air inside from fumes, that cost.   
   >>   
   >> your responces to posts here are simplistic, from 100,000 feet high with   
   >> no reality, a salesman from Musk.   
   >>   
   > Steel production in Mars atmosphere may be much easier.   
   > First:less heat-loss  (almost no conduction to air)   
   > second:molten iron will not start burning(no oxygen in air)   
   > So quality steel might be produced there with   
   > less energy(compared to earth).   
   > So on Mars by all means USE the opportunities provided   
   > by a near vacuum.   
      
   Steel is made by blowing oxygen through the pig iron.   
      
   I have no clue where you are going to get either the burnt lime or   
   dolomite that is required.   
      
      
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