Preparation technology and kinetic process of direct solar energy storage materials by doping and modifying calcium carbide slag with biomass

A novel energy storage material was synthesized using carbide slag (CS) as the calcium precursor and soluble starch/methylcellulose, MgO, and FeC 6 H 5 O 7 ·5H 2 O as dopants via wet hybrid combustion. The results of 20 carbonization/calcination cycles showed that the modified material (S5-CSMg5Fe5/MC5-CSMg5Fe5) had excellent properties. After 20 cycles, the Eg,n of S5-CSMg5Fe5 and MC5-CSMg5Fe5 were 1602.95 and 1643.01 kJ/kg, respectively, and the attenuation rate was much lower than that of CS. The modified material has a larger specific surface area, pore volume, and rich porous structure, which promotes the diffusion of CO 2 . In addition, the Fe 2 O 3 and Ca 2 Fe 2 O 3 formed by calcination enhanced the light absorption ability. Compared with the previous work, this study used the solid waste CS, and doped biomass, inert materials, and dark materials. The new energy storage materials were synthesized can not only slow down the sintering of the materials during recycling, but also be effectively used in solar energy.