Lead recovery and the feasibility of foam glass production from funnel glass of dismantled cathode ray tube through pyrovacuum process

Effective utilization of waste cathode ray tube glass—Crystalline silicotitanate synthesis

“…Panel glasses of PC monitor, provided by Huaxing Environmental Protection Corporation, was firstly ball-milled to powders (no more than 80 mesh), which was described elsewhere [21]. Chemical composition of the glass powder was examined by XRF and the results were presented in Table 1.…”

“…Thus far, many studies have been carried out on CRT glass treatments [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. In previous years, CRT glass was generally cleaned, sorted and sent to glass manufacturers for new CRT glass manufacturing.…”

“…Nevertheless, these methods paid little attention to the environmental security, since the prepared products still contain dangerous heavy metals, which should be removed or separated. Therefore, technologies for lead extraction were proposed, such as ultrasonically enhanced leaching [19], subcritical water-aided acid leaching [20] and vacuum-aided pyro-metallurging [21]. However, these extraction methods only focused on extracting/recycling lead from lead containing CRT funnel glass.…”

Preparation of lead oxide nanoparticles from cathode-ray tube funnel glass by self-propagating method

“…The PbO 3 polyhedrons are encapsulated firmly between SiO 4 tetrahedrons and high energy is needed to break the three-dimensional vitreous network [12][13][14][15]. A number of methods such as pyrometallurgy, subcritical hydrothermal, power ultrasound and mechanochemical processes have previously been developed and employed for the treatment of waste CRTs [16][17][18][19][20][21]. Among them, pyrometallurgy technology was proven an effective way of lead separation from funnel glass.…”

“…Yot et al [18] extracted 40 wt.% of total lead from waste CRTs by reaction with siliconcarbide after 60 min at 1223 K under the atmospheric pressure. Xing and Zhang [16] and Chen et al [17] recovered more than 90 wt.% of total from funnel glass at 1273 K via reaction with carbon powder under vacuum condition. These articles showed that the process is time-consuming (1-4 h) and needs a high temperature (>1200 K) to break the network structure of lead silicate and separate lead from funnel glass by the traditional pyrometallurgy method.…”