The effectiveness of stabilization of chromium containing sludge from metal surface treatment processes in a low-melting hydromicaceous clay ceramic body has been estimated. Only the chromium contained in the chromium electroplating process sludge may be stabilized in the hydromicaceous clay ceramic body with 5% and 10% of such sludge additive fired at 1 050 °C to 94.18 and 70.06%, respectively. Stabilization of sludge from the chromate conversion coating process at low temperatures which are typical of easily fusible hydromicaceous clay products is not effective, although the amount of chromium in leachate from the ceramic body with addition of this sludge decreases as the temperature is increased. Therefore the chromium contained in chromate conversion coating sludge is stabilized with the effectiveness of 32.47–79.30% in the ceramic body with addition of 10% of kaolin fired at 1 075–1 100 °C.

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