Evaluation of spray-dried sludge from drinking water treatment plants as a prime material for clinker manufacture

The control clinker contained less free CaO than sludge clinker at all three temperatures. When mix with atomized sludge was studied with the Miller procedure, the reactivity of the sludge, as a component of the raw mix, was found to be high. Both clinkers contained high proportions of alite (>70%) and their microstructure was similar in terms of alite and belite crystal size and composition, while the distribution of the liquid phase was somewhat more uniform in the control.