The invention discloses a hot
molten slag maintaining furnace for producing
mineral wool. The hot
molten slag maintaining furnace comprises 1, a cylindrical shell, wherein the cylindrical shell is a cylindrical body which is hollow and has an open top, the periphery wall of the cylindrical body is provided with a water sleeve, an upper part of the cylindrical body is provided with a
slag inlet, a lower part of the cylindrical body is provided with a
slag outlet and an iron outlet, and the
slag outlet is higher than the iron outlet, 2, a high-
alumina brick layer which is arranged on a base wall of the cylindrical body, 3, a first carbon
brick layer which is arranged on the high-
alumina brick layer, 4, a second carbon brick layer which is arranged on an inner wall of the cylindrical body, wherein the top surface of the second carbon brick layer aligns with a lower edge of the slag inlet, and 5, a
clay brick layer is arranged on the top surface and the inner side wall of the second carbon brick layer. The hot
molten slag maintaining furnace for producing
mineral wool can effectively adjust components of hot molten slag, is durable and has a low maintenance cost.