A sliding nozzle apparatus for blowing powdery treating agent in a molten metal vessel, in which {HEAD ~ a sliding plate} consisting of {TAIL ~ 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 
consisting of
A sliding nozzle apparatus for blowing powdery treating agent in a molten metal vessel , in which { HEAD ~ a sliding plate } consisting of { TAIL ~ 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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