| 摘要 |
The present invention provides a method for the melting and subsequent solidification of fine particulate material by use of a plasma torch. The fine particulate material is introduced into a furnace having a plasma torch to a depth sufficient to cover the plasma flame produced by the torch. When operative, the torch generates a heat at low gas flow, which both allows the fine particulate material to rest with little disturbance and to transfer large amounts of heat energy to the fine particulate, effectively preheating the fine particulate material for more efficient melting. The melt may, for example, be solidified into a block for building use, into fibers by way of pressurized air passed through a venturi nozzle or into other useful forms.
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