LI Yueming, LIU Tao, WANG Zhumei, SHEN Zongyang, XIE Zhixiang, OU Shangyao
(Jiangxi Key Laboratory of Advanced Ceramic Materials, School of Materials Science and Engineering,
Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)
Abstract: Inorganic salt Na2SO4 and Quartz ceramic matrix of Na2SO4 /SiO2 composite phase change energy storage materials (CESMs) were separated by soaking CESMs in boiling water. The research showed that after CESMs were ground into powders under the mesh size of 12 and the powders were soaked in boiling water at 100 ℃ for 2 h, 100% of Na2SO4 was dissolved out from powders. Then after adding 25wt.% of charcoal (under the mesh size of 325) into the residual powders (under the mesh size of 325), the re-prepared porous quartz ceramics had excellent performance as follows: the apparent porosity was 52.63%, the bending strength was 3.01 MPa, the average pore size was 13.11 μm, the pore size ranged from 7 to 23 μm, and the newNa2SO4 /SiO2 CESMs had the infiltrating rate of 48.13%. The research results indicated that soaking CESMs powders in boiling water could effectively recycle inorganic salts/ceramic CESMs material, thus further improving its market prospect.
Key words: composite phase change energy storage materials; inorganic salt; recovery; soaking