With the increase of productive power of the lead column in the
zinc refining system in Shaoguan Smelter, the condenser always
keeps away from breaking the top apart. At present the defence-roof at the top of condenser was removed to strengthen radiating heat intensity to in order to meet the requirement of output. In this study the radiating heat state of the condenser for the
lead column was measured. The results show that for the vertical wall of the condenser, there is great change in temperature along the direction of the height, and the temperature difference of the north wall is larger than that of the east and west walls. The temperature of liquid zinc is not enough high to increase saturation pressure to break the top apart. The excellent heat conduction of liquid zinc makes a large number of surfaces of the walls to condense liquid film which flows on the inner walls, which hampers the process of phase transformation condense. The position of the melt for zinc vapor is too high, which increases the thickness of the liquid film and becomes a main reason for great difference of temperature along the direct of height.