残渣 cánzhā leavings

浮渣 fúzhā dross; scum

矿渣 kuàngzhā slag

煤渣 méizhā cinder

油渣 yóuzhā greaves

渣油 zhāyóu residuum

渣滓 zhāzǐ lees

Copyright (c) 2021 David Pearce