9
1.5.5 Diamond Cutting Method
This method can be carried out both under moist and parched conditions. During
moist condition, diamond saw blades cut along the frit line of a cathode-ray tube
with coolant water being sprayed while the cathode-ray tube kept in an enclosure
keep rotating. The moist condition is suitable for all thickness and sizes of the
cathode- ray tube. While during the parched process, diamond wheel and diamond
belt with abrasive are used in the absence of water. The parched condition is more
suitable for large-scale operation due to better performance in terms of clean separation (Lee et al. 2004; Heart 2008). However, the disadvantage for the application of
parched condition is initially high investment costs. The diamond cutting method is
faster than traditional mechanical cutting method due to its vacuum adsorption and
dust recovery capacity, automatic edge searching, and laser positioning (Yu et al.
2016). This method is generally performed in three stages. In the first stage, a vacuum is removed and electron gun is dismantled. In the second stage, front panel,
funnel glass, and shadow mask are all segregated, and in the last stage, front panel
and funnel glass’s coating is cleaned.
1.5.6 Water Jet Separation
High-pressured water containing abrasive materials in the form of the jet is sprayed
through a nozzle along the frit line of the cathode-ray tube. This method is simple
and affordable, but usually, the presence of abrasive materials contributes to wastewater which is a major concern (Heart 2008).
1.5.7 Acid Melting
Acid melting injects hot nitric acid and hot acid bath to dissolve the interface joining
the panel and funnel of the cathode-ray tube. The major challenges in the use of this
technology are the requirement for disposal of a large amount of wastewater and
leachate generated during this method (Yu et al. 2016). Hence, this method is not
suitable or recommended due to its adverse impact on the environment.
The above methods used for segregating funnel glass do not take into consideration in the presence of fluorescent colors in coatings. These coatings are of concern
due to various metals which can be removed by the following technologies as shown
in Table 1.2.
1 Solution and Challenges in Recycling Waste Cathode-Ray Tube
1.5.5 Diamond Cutting Method
This method can be carried out both under moist and parched conditions. During
moist condition, diamond saw blades cut along the frit line of a cathode-ray tube
with coolant water being sprayed while the cathode-ray tube kept in an enclosure
keep rotating. The moist condition is suitable for all thickness and sizes of the
cathode- ray tube. While during the parched process, diamond wheel and diamond
belt with abrasive are used in the absence of water. The parched condition is more
suitable for large-scale operation due to better performance in terms of clean separation (Lee et al. 2004; Heart 2008). However, the disadvantage for the application of
parched condition is initially high investment costs. The diamond cutting method is
faster than traditional mechanical cutting method due to its vacuum adsorption and
dust recovery capacity, automatic edge searching, and laser positioning (Yu et al.
2016). This method is generally performed in three stages. In the first stage, a vacuum is removed and electron gun is dismantled. In the second stage, front panel,
funnel glass, and shadow mask are all segregated, and in the last stage, front panel
and funnel glass’s coating is cleaned.
1.5.6 Water Jet Separation
High-pressured water containing abrasive materials in the form of the jet is sprayed
through a nozzle along the frit line of the cathode-ray tube. This method is simple
and affordable, but usually, the presence of abrasive materials contributes to wastewater which is a major concern (Heart 2008).
1.5.7 Acid Melting
Acid melting injects hot nitric acid and hot acid bath to dissolve the interface joining
the panel and funnel of the cathode-ray tube. The major challenges in the use of this
technology are the requirement for disposal of a large amount of wastewater and
leachate generated during this method (Yu et al. 2016). Hence, this method is not
suitable or recommended due to its adverse impact on the environment.
The above methods used for segregating funnel glass do not take into consideration in the presence of fluorescent colors in coatings. These coatings are of concern
due to various metals which can be removed by the following technologies as shown
in Table 1.2.
1 Solution and Challenges in Recycling Waste Cathode-Ray Tube