Thursday, July 30, 2015

Icelandic 6 - Recovering the BLOOM

Recovered bloom - only cold worked to remove clinging slag and gromps
This is the collected data from breaking apart the large mass extracted from Icelandic 6

complete SLAG MASS 68 30.9 includes tap arch stones
loose slag recovered 4.52
large mass in above 1.26
tuyere recovered 0.36
tap arch stone recovered 12 5.5
main mass with thin edges removed 40 18.2
loose fragments from above 13 5.9
fine slag / earth fragments 1.5
very dense slag from lower bowl 2.7
larger slag fragments recovered 3.9
bloom recovered 17 7.7 as cold hammered over surface
gromps 0.68 magnetically recovered
total slag recovered 17.7 + 1 cm recovered
bloom as recovered 7.7
TOTAL ORE ADDED 30.8 from smelt sequence
INPUT TO OUTPUT - 5.4 loss of fine materials

Note - the larger amounts had to be recorded using a bathroom scale, which at best was only accurate to +/- .5 lbs. KG amounts for these larger measurements calculated (/ 2.2). Amounts below 6 kg were measured using a more accurate digital scale, but are rounded off to one decimal to match.
Mass as Extracted - Tuyere and Tap Arch Stones attached
Thin crust of Slag and Fused Earth - around Tuyere (marked by green line)
Slag Block - Side View (most of stone, Tuyere, slagged earth removed)
Very dense Slag, the solidified 'bowl' from under the bloom.

 Yield = 25%

The bloom weight recorded is a bit elevated when compared to other smelt records. The normal practice  is to extract the bloom while white hot - and then strike over the surface. This removes the majority of clinging slag. The cold hammering used in this case did remove the majority of this, but certainly not as effectively as hot working. Normally striking over the bloom surface at a welding heat also compacts some of the lacy 'gromps' over the surface. The cold hammering could not do this effectively, so likely some additional material will be lost when the bloom is finally compressed into a billet.

In general, this experiment, as a full scale test of a proposed Icelandic / Grass sod construction, can be considered a good success.
The major modern intrusion to likely Norse / Viking Age method remains the use of high volume air via the electric blower.

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February 15 - May 15, 2012 : Supported by a Crafts Projects - Creation and Development Grant

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