| EVENT | Date | June (20) 2021 | |||||||
| Description | Low Air' & LAM clay test | ||||||||
| Goal | air reduced to match smelt bellows | ||||||||
| Team | Darrell Markewitz (M) | ||||||||
| Neil Peterson | |||||||||
| Max | |||||||||
| extraction | Rey Cogswell | ||||||||
| compaction | Richard Schwitzer | ||||||||
| Isabelle Wigglesworth | |||||||||
| FURNACE | Type | standard short shaft on plinth | |||||||
| Material | standard cob / LAM clay + sand | ||||||||
| Walls | cylinder / clay+sand+horse | 7 to 4 | |||||||
| Interior | 25 | ||||||||
| Height | 60 A | ||||||||
| Stack | 44 | ||||||||
| Base | 16 | ||||||||
| Packing | charcoal fines | 18 | |||||||
| Tuyere | standard copper | ||||||||
| Diameter | 2 | ||||||||
| Angle | -25 | ||||||||
| Proud | 5 | ||||||||
| Air System | standard electric blower | ||||||||
| Extraction | bottom via plinth | ||||||||
| MATERIALS | Ore | DD 1 (red) | 51% Fe | ||||||
| Charcoal | Oak / 'Cowboy' (hickory?) | ||||||||
| Real | ELAPSED | EVENT | AIR | CHARCOAL | ORE | ||||
| UNIT | COUNT | TOTAL | Unit | TOTAL | |||||
| pressure | LpM | bucket | kg | kg | kg | ||||
| psi | 1.8 | ||||||||
| 900 | start wood splints pre-heat | touch | |||||||
| 1000 | T 60 | start rough charcoal (Cowboy) | 500 | 1 | 1 | 1.80 | |||
| 1003 | 1 | 2 | 3.60 | ||||||
| 1015 | to about 8 cm below top | 1 | 3 | 5.40 | |||||
| 1030 | 1 | 4 | 7.20 | ||||||
| 1035 | temperatures BF=1270+ / BR=1270+ | ||||||||
| UF=1020 / UR=960 | |||||||||
| 1040 | gases ignight on top | ||||||||
| 1050 | 25 | last rough - switch to graded (Cowboy) | 1 | 5 | 9.00 | ||||
| 1112 | 22 | heat to top of coloumn | 1 | 6 | 11.16 | ||||
| 1125 | temperatures BF=1275+ / BR=1275 | ||||||||
| UF=1245 / UR=1190 | |||||||||
| 1132 | 20 | 1 | 7 | 12.60 | |||||
| 1140 | first ore addition - Barton's Limonite | ||||||||
| 1157 | 25 | 1 | 8 | 14.40 | 1 L | 1 L | |||
| 1224 | 27 | temperatures BF=melted / BR=1270+ | 1 | 9 | 16.20 | 1 L | 2 L | ||
| UF=1150 / UR=1150 | |||||||||
| 1244 | 20 | switched to analog | 1 | 10 | 18.00 | 1 O | 1 O | ||
| 1304 | 20 | 1 | 11 | 19.80 | 1 | 2 | |||
| 1330 | 26 | 1 | 12 | 21.60 | 1 | 3 | |||
| 1354 | 24 | increase ore | 1 | 13 | 23.40 | 1.5 | 4.5 | ||
| 1416 | 22 | 1 | 14 | 25.20 | 1.5 | 6 | |||
| 1431 | 15 | slag tap | 1 | 15 | 27.00 | 1.5 | 7.5 | ||
| 1502 | 31 | increase ore | 1 | 16 | 28.80 | 2 | 9.5 | ||
| 1526 | 24 | slag tap | 1 | 17 | 30.60 | 2 | 11.5 | ||
| 28 E | missed record / oak / ore increase | 1 | 18 | 32.40 | 2 | 13.5 | |||
| 1621 | 28 E | 1 | 19 | 34.20 | 3 | 16.5 | |||
| 1643 | 22 | slag tap | 1 | 20 | 36.00 | 3 | 19.5 | ||
| 1710 | 27 | 1 | 21 | 37.80 | 3 | 22.5 | |||
| 1735 | 25 | balance ore | 1 | 22 | 39.60 | 2 | 24.5 | ||
| 1805 | 30 | final charcoal to cover | 1 | 23 | 41.40 | ||||
| start burn down | |||||||||
| TOTALS | |||||||||
| Charcoal | 41.4 | kg | |||||||
| Ore | 24.5 | kg | |||||||
| poor limonite added | 2.0 | kg | |||||||
| Bloom | 7.0 | kg | |||||||
| Gromps | |||||||||
| Yield | 28.6 | % | |||||||
| Condition | entire bowl extracted - top eroded | ||||||||
| Quality | very spongy | ||||||||