Preparation of hydrothermally solidified materials from waste cathode ray tube panel glass for construction applications

Abstract

Solidi cation of cathode ray tube (CRT) panel glass was carried out using a hydrothermal processing method. In this way, the glass powder was rst compacted in a mold at 20 MPa, and then hydrothermally cured in an autoclave under saturated steam pressure at 200 ℃ for 6 hours. The CRT panel glass was then hydrothermally solidi ed by the formation of tobermorite (Ca 5 Si 6 O 16 (OH) 2 •4H 2 O), which was encouraged by the addition of slaked lime (Ca(OH) 2 ). The nal solidi ed specimen's strength was heavily depended on the amount of tobermorite formed, with higher concentrations of tobermorite producing commensurately greater mechanical strength. With the addition of slaked lime at 20%-30% by mass, the specimen achieved a exural strength of approximately 16 MPa, which is su ciently great for using as a construction material. As such, there is cause to believe that the hydrothermal processing method used here may have substantial potential for the product of high-quality recycled CRT panel glass with properties suitable for utilization as a construction material.