Abstract
Experiments were performed to investigate optimised operational conditions for the production of recyclable plaster based on plaster waste from construction and demolition projects or the plasterboard industry in a continuous furnace with a mobile helical element on a bench scale. After the definition of the granulometry that provided the reaction conditions with no diffusive effects, a 22 rotational central composite design (CCRD) had been used for the experimental planning, where the factors of which were mean reactor temperature (148 °C and 162 °C) and gauge pressure (0.2–0.8 bar). The statistical analysis of the results based on the response surface methodology allowed the identification of the optimised operational conditions (162.4 °C and 0.5 bar). Under these conditions, the Avrami-Eurofe'ev equation was tested and confirmed (n = 2) for the kinetics of the thermal dehydration process. The capacity of the equipment to produce recyclable beta plaster was tested and confirmed by Scanning Electron Microscopy of the plaster crystals.
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