Patent ID: 8430281

Claim:
A high-heat-retention ladle for carrying molten aluminum, comprising: a ladle body defining therein a storage space, which contains molten aluminum therein, wherein the ladle body includes a molten metal inlet and a molten metal outlet, which allow the storage space to communicate with outside; a cover opening and closing the inlet of the ladle body; and a stopper opening and closing the outlet of the ladle body, wherein each of the ladle body and the cover has an outer shell, which defines a contour thereof, and a multi-layer insulation structure inside the outer shell, the multi-layer insulation structure including two or more refractory layers, whereby the molten aluminum contained inside the storage space has a temperature drop rate of 5° C/min or less, wherein the multi-layer insulation structure of the ladle body includes an outer molded refractory, an outer castable refractory, an inner molded refractory, and an inner castable refractory, which are stacked sequentially over an inner surface of the outer shell toward inside of the ladle body, wherein the inner castable refractory is made of a material chemically unreactive with aluminum, and the inner molded refractory is made of a silicon dioxide based molded material that alleviates weight and impact between the inner castable refractor and the outer castable refractory, and wherein the inner castable refractory includes an inside wall protruding upward from a bottom central portion of the ladle body.