Abstract: Artificial delivery drainage sand to the ladle was used in the steel-making plant of Laiwu Iron and Steel Group Corporation. In order to solve problems, such as wasting drainage sand, increasing inclusions, reducing the free-opening rate of water slot and restricting production of steel-smelting. Mechanical delivery of drainage sand was achieved through developing a delivery technology of drainage sand by a composite shunt and optimizing the brick cup of water slot. The new technology increased the free-opening rate of water slot from 95.5% to 99.2%, and the consumption of drainage sand reduced to 0.37kg/t.

Key words: ladle, drainage sand, free-opening rate, inclusion