{HEAD ~ A sliding nozzle apparatus} for blowing {TAIL ~ powdery treating agent} in a molten metal vessel, in which a sliding plate consisting of refractory materials is provided with one or more of tuyeres for blowing powdery treating agent, and an upper nozzle consists of a gas permeable ceramic material 
{ HEAD ~ A sliding nozzle apparatus } for blowing { TAIL ~ powdery treating agent } in a molten metal vessel , in which a sliding plate consisting of refractory materials is provided with one or more of tuyeres for blowing powdery treating agent , and an upper nozzle consists of a gas permeable ceramic material
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