Recently, the ash melting furnace has become important for the waste disposal technology from the viewpoint of environmental protection. SiC, C-SiC, Al_2O_3-Cr_2O_3 and MgO-Cr_2O_3 refractories are usually used for these furnaces according to individual furnace operating conditions. The features of these refractories for various types of ash melting furnaces are summarized and newly developed chrome-free refractories are introduced in this report. Chrome-free refractories utilizing specially prepared spinel raw materials show almost the same or even better slag erosion resistance than conventional chrome containing refractories. The application and improvement of these chrome-free refractories will be the important subject for future waste melting furnace technology from ecological and environmental aspects.
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