无机盐/石英基复合储能材料的回收利用

Recovery of Inorganic Salt/Quartz Composite Phase Change Energy Storage Materials

采用沸水浸渍法来分离Na2SO4/Si O2复合储能材料中的无机盐与石英陶瓷基体,实现复合储能材料的回收利用。研究表明,将复合储能材料研磨成12目筛以下的粉体并在100℃的沸水中浸渍2 h,能够使得无机盐清除率为100%。将浸渍后剩余的粉末研磨过325目筛,添加占粉末重量25wt.%木炭粉(过325目筛)能够制备出综合性能较好的石英多孔陶瓷基体,其显气孔率为52.63%,抗折强度为3.01 MPa,平均孔径为13.11μm,孔径分布为7-23μm,所制备的复合储能材料的Na2SO4浸渗率达48.13%。通过研磨后沸水浸渍法有效地回收利用了复合相变储能材料,提高了无机盐/陶瓷基复合储能材料的市场化价值。

Inorganic salt Na2SO4 and Quartz ceramic matrix of Na2SO4/Si O2 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 25 wt.% 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 new Na2SO4/Si O2 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.