On-line modified oxygen spraying device for liquid refining slag

The utility model relates to an on-line modified oxygen spraying device for liquid refining slag. The oxygen spraying device comprises an oxygen lance and a slag tank, wherein a tank cap is fastened at an upper end opening of the slag tank; an air inlet pipe is connected at the inlet of the oxygen lance; the oxygen lance is arranged on the tank cap; one end of the oxygen lance penetrates through the tank cap, stretches into the slag tank, and is inserted into the slag surface of refining slag; the oxygen lance can move up and down along a pillar; the tank cap is further connected with a rotating mechanism; the pillar of the rotating mechanism is fixed on the tank cap. The oxygen lance can move up and down according to the position of liquid refining slag in the slag tank, the end part of the oxygen lance is enabled to be inserted into the slag surface of refining slag, and oxygen or air is sprayed in an on-line manner in the discharging process of the liquid refining slag; as the end part of the oxygen lance is inserted into the slag surface of the refining slag, and oxygen or air is pumped into the refining slag and is uniformly mixed in the refining slag, so that the refining slag is prevented from reduction degradation or partial reduction degradation; the oxygen spraying device is uniform and dispersed in spraying, and the purpose of on-line modification of the refining slag is realized.