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

Li 4 SiO 4 was obtained by using quartz powder of different particle sizes (75–180 μm, 45–75 μm, 38–45 μm, and <38 μm) and Li 2 CO 3 as raw materials through a solid-state reaction at 720 °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 Li 4 SiO 4 phase increased, and the size of the grain agglomerates decreased gradually. The enhanced chemical reactivity of the quartz powder with Li 2 CO 3 and the shortened diffusion distance as the quartz size decreases are helpful to the formation of the Li 4 SiO 4 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.