The lava waterfall door

Some areas of the evil meant lair are not for the eyes of the average minion. There is only one way in and out of this area, there is no door blocking the way, but a lava waterfall pouring from the ceiling, completely covering the section of the corridor. The lava is actively recycled and a mechanism "opens" the waterfall from the center when the villain approaches.

Is this setup possible? Are there materials that can consistently contain molten rock without melting?

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The lava waterfall door

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