Lance and operation method using the same

A lance for blowing a source gas into a container in which a reaction gas is generated, the lance comprising:

• a wall body forming a vertical gas passage inside thereof, a source gas being capable of flowing downwards through the vertical gas passage;
• a gas storage part formed in an upper portion of the vertical gas passage of the wall body, wherein the gas storage part accommodates the source gas;
• a mixing part formed under the gas storage part, the mixing part having a predetermined vertical length, wherein the source gas accommodated in the gas storage part is discharged into the mixing part;
• a suction hole formed to penetrate the wall body toward the mixing part at a position between the gas storage part and the mixing part, the suction hole being inclined towards the mixing part in such a way that a first reaction gas is suctioned into the mixing part from outside the vertical gas passage and reacted with the source gas discharged from the gas storage part to form a second reaction gas;
• and
• a discharge part formed under the gas mixing part, the discharge part having a predetermined vertical length, wherein the second reaction gas is discharged through the discharge part, wherein the mixing part is gradually narrowed toward the discharge part.