Development of Coloured Stoneware Bodies through the Incorporation of Industrial Cr/Ni Electroplating Sludge

Electroplating sludge (ES) is currently disposed in landfills and, because of its heavy metal content, poses serious threats to the environment and human health. However, ES might have potential use as colouring agent due high concentration chromium nickel. Thus, present work aims at studying effect incorporation into stoneware bodies. The influence on final characteristics fired samples, amount pre-treatment were analysed. It was found that pastes having uniform brownish hues can be obtained with only 3 wt.% sieved (<212 ?m) ES. specimens have, once fired, desired technical aesthetical characteristics. Further, leaching tests confirmed immobilisation hazardous species ceramic matrix. Hence, it concluded this waste used substituting commercial pigments contributing more sustainable consumption production sector.