May 4, 2008

Use of local ores using roughly standard methods in Norse short shaft furnace.
CLOCK ELAPSED EVENT AIR CHARCOAL   ORE    
        COUNT TOTAL COUNT AMOUNT TOTAL
          kg 200 gm kg kg
                 
7:17   start wood splints pre-heat            
8:50 1:33 set base, start charcoal gentle          
9:00 0:10 fill with rough charcoal one third 11 11      
9:17     full          
                 
9:20   adjusting for burn rate   1 1      
9:28 0:08     1 2      
9:34 0:06     1 3      
9:40 0:06     1 4      
9:45 0:05     1 5      
9:54 0:09     1 6      
10:00 0:06     1 7      
10.01   Heltborg ore       2 0.4 0.4
10:05   adjust air by sound            
10:07 0:07     1 8 2 0.4 0.8
10:20 0:13 ore addition not recorded   1 9 4 0.8 1.6
10:26           2 0.4 2
10:34 0:14     1 10 2 0.4 2.4
10:41           2 0.4 2.8
10:45 0:11     1 11 2 0.4 3.2
10:52           2 0.4 3.6
10:57 0:12     1 12 2 0.4 4
11:01           3 0.6 4.6
11.06 0:09     1 13 3 0.6 5.2
11:10   200 gm Heltborg + 400 gm Swedish       3 0.6 5.8
11:15 0:09 Swedish ore   1 14 3 0.6 6.4
11:21           4 0.8 7.2
11:24 0:09     1 15 4 0.8 8
11:29   600 gm Swedish + 200 gm Guldager       4 0.8 8.8
11:39   air problem' - slag tapped            
11:40 (0:15) Guldager ore   1 16 4 0.8 9.6
11:45           4 0.8 10.4
11:50 0:10 Heltborg ore   1 17 4 0.8 11.2
11:58 0:08 wait to stabilize   1 18      
12:00           2.5 0.5 11.7
12:06 0:08     1 19 2.5 0.5 12.2
12:10           2.5 0.5 12.7
12:15 0:09     1 20 2.5 0.5 13.2
12:24   shock charge of Swedish ore       5 1 14.2
    tuyere angle shifts to flat            
    air problem' - slag tapped            
12:35   start burn down       5 1 15.2
                 
13:10 0:35 extraction starts            
                 
    Heltborg           8.2
    Swedish           5.2
    Guldager           1.8
                 
3:50   TOTALS     20     15.2
                 
    BLOOM 1.8          
    YIELD 12%          

Last Updated on 6/10/08
By Darrell Markewitz
Email: ironsmelt@warehamforge.ca