A sliding nozzle apparatus for blowing {HEAD ~ powdery treating agent} in {TAIL ~ 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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A sliding nozzle apparatus for blowing { HEAD ~ powdery treating agent } in { TAIL ~ 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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