The fragments of vitrified ceramics, tuyere
, quartz, haematite and dense slag with flow marks found during the excavation suggest that these structures were furnaces used for iron smelting.
When the oxygen-enriched air is injected from tuyere
into the bath at a low velocity, the air is actually sprayed into the molten pool at a pulse type, belonging to the bubble generation system, namely, the bubble bath smelting.
Our smelting experiments necessitated the continuous labor of three to four individuals providing continuous draft into a small furnace through narrow blowtubes with ceramic tuyeres
for roughly three hours to produce slag lumps weighing ca.
Shlyapnikov, "Method of Calculating and Designing Systems for Distributing Coal-Dust Fuel among a Blast Furnace's Tuyeres
," Steel in Translation 27(1), 11-20 (1997).
The report theorized that the injection of the upgraded ASR would be done through the tuyeres
of the blast furnace directly into the combustion zone, thereby reducing the total amount of fuel material required.
In the lead circuit, US$3.8 million will provide a new bank of cells to give the extra 10,000 t of output, half of which will be seen this year, also automatic controllers are to be installed on the tuyeres
in the lead blast furnace and there is to be some equipment replacement.
- three concentric pipes that carry wastes in the center, oxygen in the intermediate pipe, and methane in the outer pipe - are also incorporated in the design.
Evidence for this early mining activity comes in the form of copper slag deposits (Halbich, 1968), stone constructions and several tuyeres
(blast furnace nozzles) found in the vicinity.
1) in full operation was quenched by substituting nitrogen for the air blast and adding water through the charge door until water ran out at the tuyeres
. The quenching process was completed in 15 minutes.