High-performance calcium-based thermochemical heat storage material based on solid waste synergy and grain boundary pinning effect and gradient pressure preparation method thereof

Abstract

The embodiment of the application provides a high-performance calcium-based thermochemical heat storage material based on solid waste synergy and grain boundary pinning effect and a gradient pressure preparation method thereof, and comprises the following steps: S1, taking steel slag, red mud and straw powder as calcium raw materials, uniformly mixing them according to a mass ratio of 1:(0.1-0.3):(0.2-0.5), performing powder grinding, injection molding and sintering to obtain a basic calcium matrix; S2, soaking the obtained sintered body in a surfactant aqueous solution, cleaning to neutral, and drying to obtain a treated sintered body; S3, calcining and cooling the treated sintered body to obtain a pre-stabilized product; and S4, sealing the pre-stabilized product in a pressure container, injecting high-temperature carbonizing agent steam into the container, and performing gradient pressure carbonization treatment. In combination with the gradient pressure carbonization and steam activation in-situ toughening process, the energy storage density of the material is significantly improved, the cost is greatly reduced, and the cycle stability is optimized.