Smelting ladle and method for improving use efficiency thereof

A method for improving use efficiency of a smelting ladle, the smelting ladle comprising a housing, a working layer, and a permanent layer, and the method comprising:

• 1) rebuilding the working layer to have an outer layer and an inner layer, wherein the inner layer is formed by masoning and directly contacts with molten steel and steel slag, and the outer layer is formed by casting, contacts with the permanent layer or directly contacts with the housing, and comprises between 55 and 70 parts by weight of a sintered microporous corundum aggregate, between 5 and 10 parts by weight of a magnesia-alumina spinel aggregate, between 10 and 25 parts of a fine powder, between 2 and 8 parts by weight of a micro powder, between 3 and 8 parts by weight of a binder, between 0.1 and 0.5 part by weight of a detonation suppressor, between 0.05 and 2 parts by weight of a water reducing agent, and between 0.01 and 0.1 part by weight of a foaming agent;
• 2) allowing the smelting ladle to work, when a thickness of the inner layer is reduced to be between 0 and 20 mm, which means a smelting stage of the smelting ladle is completed, removing a residue of the inner layer and masoning a new inner layer for the smelting ladle;
• and
• 3) repeating 2) until the outer layer reaches a designed service life thereof, and casting a new outer layer for the smelting ladle.