In one experiment we used 4.5 kg of autoclaved pellets and 60% SnO2 content which had been crushed with 8-15 mm granules in a ratio of 0.45 kg k / kg SnO2. The materials were loaded into a cylindrical incineration chamber with 180 mm diameter and 600 mm height(blast furnace or water – Jaket, cubilou sistem ) with bottom burning. After all the material and coke had been loaded and the surface, on the last layer exceeded 1000 oC , melting stopped. Not found molten metal – Sn or slag in the crucible. Only coke slag ash was found at the bottom levels of the shaft. What is the explanation that no metal was found ( Sn ) in the crucible? Is it possible that the partial vaporization pressure of SnO2 is so high?
A plausible explanation for volatilising Sn would be the formation of halogen compounds (chlorides or bromides). Please check the presence of Cl or Br.
It is interesting and unique perspective approach. Thank you very much !
Mircea H
Assuming no halogen compounds were present, all would depend on the conditions inside your furnace. What temperature was the hottest zone? How much cokes was used? How much (and which) gas has been injected (if you inject a lot of gas in your system, you don't need a high partial pressure to evaporate a lot of material)? How fast was the gas injected (the faster the gas travels through your furnace, the less time the evaporated Sn has to condense inside your furnace).
Keep in mind that material that evaporated in the hot zone of your furnace does not necesarrily condense again on the material on top of the furnace, due to the limited time in the furnace.
Did you eventually find the Sn somewhere in your gas cleaning system?
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