Effect of the Particle Size of Quartz Powder on the Synthesis and CO2 Absorption Properties of Li4SiO4 at High Temperature

Li4SiO4 was obtained by using quartz powder of different particle sizes (75-180 mu m, 45-75 mu m, 38-45 mu m, and <38 mu m) and Li2CO3 as raw materials through a solid-state reaction at 720 degrees C. X-ray diffraction (XRD), scanning electron microscopy (SEM), and differential thermal analysis and thermogravimetry (DTA/TG) were used to examine the sintering behavior and properties of the samples. The results indicated that when the particle size of the quartz powder decreased, the solid-state reaction performed more completely, the content of the Li4SiO4 phase increased, and the size of the grain agglomerates decreased gradually. The enhanced chemical reactivity of the quartz powder with Li2CO3 and the shortened diffusion distance as the quartz size decreases are helpful to the formation of the Li4SiO4 phase. The sorption analysis revealed that the samples synthesized using the quartz powder with smaller particle sizes experienced a more rapid absorption-desorption process with a higher absorption efficiency.