Data & Resultspage updated: Oct. 5, 2000  



 Yield comparison of our smelting experiments

The recipe for each experiment is available, visit the diary pages listed here.
Diary for smelt 12-20 (not completed yet)
Diary for smelts 21- 27
Diary for smelts 28 - 38
 Martha Goodway tests the bloom


Summary of Smelting Experiments

 Link to Smelt Diary Preheat time  Fuel:Ore Ratio (during charge)  Total Ore (lbs)  Gromp &Recycled Slag (lbs)  Tap Slag Recharged (lbs) Total Flux (lbs) Air Flow Smelt Time (first to last charge) Post Heat time(includes slag recharging)  Total Time Bloom Weight  Notes:
 Furnace Configuration #2 - tall shaft or low shaft - without preheater
 12  4:30 6:5 75 lbs Dixie Goethite     7.5 Limestone

 24cfm

680 l/min

4:00 2:30  11:00 40 Lbs.  tall shaft
 13  5:00 3:2 60 lbs. Dixie Goethite      8 lbs. Limestone

 26cfm

736 l/min

1:50  2:10  9:00  23 lbs.  tall shaft
 14  3:30 8:5 80 lbs.     3 lb clay
3 lb Limestone

 57 cfm

1614 l/min

2:00 1:40  7:10 20 lbs.  tall shaft
 15  4:00 1:1 75 lbs.     none

 43 cfm

1217 l/min

2:10 1:30  7:40 18 lbs.  tall shaft
 16  2:50  1:1  75 lbs.   21 lbs bloombits and slag    9 lbs. Limestone    3:40       20 lbs.  tall shaft
very dense bloom (see picture) low carbon content
 17  2:40  1:1  117 lbs.      11 lbs. Limestone    3:30        18 lbs.  low shaft
tap slag recharged
 18  3:00  1:1  126 lbs.  20 lbs. bloombits and slag  yes  10 lbs. limestone    3:05  1:05  7:10  25 lbs.  low shaft height. tap slag recharged
 19  2:55  1:1  120 lbs.  10 lbs bloombits and slag  yes  9 lbs. limestone    4:45  1:05  8:45  25 lbs.  tall shaft, misc. ore
Furnace Configuration #3- low shaft with preheater
 20  3:00  1:1  105 lbs.  15 lbs. slag  10  8 lbs.  700-1125 l/min  3:20  3:00  9:20  13 lbs.  low shaft with preheater\Glenwood ore
 21  1:25  6:5  80 lbs.ore  10 lbs. bloombits and slag  yes  ~ 12 lbs  1125-1275 l/min  1:55  2:00  5:20  23 lbs. SEE JOURNAL
 22  1:38  6:5  75  15  13  6 lbs  1275-1625 l/min  2:06  2:32  6:16  33 lbs   produced high calcium slag and low carbon iron
 23  1:35  1:1  105    41  none  1275-1500 l/min  2:00  2:45  6:20  40 lbs  
 24  1:40  1:1  101  13  46  none  1275-1500 l/min  1:55  2:25  6:00  28 lbs  very low carbon content- late ore charge added to decarburize
 25  1:28  1:1  89  13  32  none  1275-1625  1:30  2:32  5:30  31 lbs  med/low carbon
Picture of bloom
 26  1:30  1:1  90  10  41  none   1275-1625  2:15  2:50  6:35  29 lbs  in Flagstaff AZ, at 7000 ft, dense, low carbon
 27  1:45  1:1  102  10  28  none    1275-1625  2:23  2:47  6:55  32 lbs  also in Flagstaff, high carbon steel
                         
                         

 


Yield Analysis

;
 Smelt # Total Ore  Bloom wt. Yield*  Billet wt.  Yield Bar wt.  Yield
 12  75 lbs 40 lbs 106%  22 lbs.  59%    
 13  60 lbs. 23 lbs. 77% 10 lbs. 33%    
 14  80 lbs. 20 lbs. 50%     11 lbs.  28%
 15 75 lbs. 18 lbs. 48% 10 lbs. 27%    
               
Crew xp27 16.7 3.74 lbs. 40% 1.94 lbs. 21% 1.38 lbs. 15%
               

*Note: In this table we have followed the conventions of Tylecote and Crew of expressing our results as a percentage of iron available in the ore. Historical and contemporary analyses indicate that this ore averages 50% Iron content by weight.