Plant for recycling the glass from CRTs

The most sold plant of its kind in the Federal Republic of Germany

Mode of operation:

The CRT is divided into two pieces by a glow wire (stress cracking process): the screen section and the rear cone section. After the splitting operation, the fluorescent coating is removed from the screen section (vacuum cleaned). As a result two recycable grades of glass are recovered from the CRT.

Processed material:

Dismanteld and aerated CRTs without their clampingring.

Throughput:

We guarantee a minimum throughput of 30 large colour CRTs per hour with one member of staff. However, with good logistics 35 units per hour are easy to attain.

Size and features:

3.5 x 1 m² depositing area, additional units about 2 m², CRTs fed optionally from left/right/front, available as a mobile unit.

To be provided by customer:

2 electricity connections 380 V, 16 A slow fuse, opening in outside wall diameter approx. 250 mm.

Safety at work:

• Protective hood, kept under a vacuum, above hood de-aeration unit about 2500 m³/h, with filter application category 51, de-aeration unit application category Kl.
• Suction unit for fluorescent coating with the same filter specifications as the hood de-aeration unit.
• Dust-free removal from the vacuum-cleaned fluorescent coating through disposable filter containers
• Exhaust air emitted into atmosphere
• All accessable components have low voltage
• Elektric interlock when hoods opened

Permit:

When the order is placed, we provide on request the necessary documents for the permit.

Glass recycling:

On request we take back the CRT glass and return it to the glass industry or a nonferrous metal smelting works (against a small surcharge).

Dimensional drawing (dimensions in cm):

1. Separating device
2. CRT lifting table coating
3. Telescopichood
4. Stationaryprotectivehood
5. Switch box
6. Conainer for collecting pieces of glass at the side
7. Brush head for extracting the flourescent
8. Kl suction unit
9. Vacuum holding device for the two hoods

GWG is a consulting company for the planning and implementation of measures to recycle electric an electronic scrap.

Our range of services comprises:

• Production and sale of our own plant for recycling CRTs
• Permit planning
• Operations planing and workshop facilities(independent of manufactures apart from our own plant!)
• Temporary acceptance of cleaned CRT glass and/or the arrangement of recycling by a recycling company
• Expertises and plant audits

All our sold plants are installed, approved and in service; the oldest one has been running for 5 years. Our cutomers include small companies as well as the market leaders. The total installed capacity can deal with the used TV tubes of 80 million people.

Proven technology - low capital expenditure - Minimum running costs

Purpose of facility:

The facility can be used for the serparation of dismantled picture-tubes of TV-sets and other screen facilities into two parts: The screen and the backward conus. This seperation serves for two purposes:

• to clean front glass from polluting flourcent layer
• to obtain two recycable glasses ( main substance of front glass: barium-oxyd, main substance of backward conus: lead-oxyd)
• After the serperation, the two different glasses can be recycled to high-quality materials. The recycling of „mixed glass“ is ussally only possible at high sorting costs.

Proportion outline/ Operation of facility:

Facility is installed on table.

- standing space 2 squaremeter for typ single, 4 square meter for type double

- another 2 square meters for additional equipment (small compressor, ventilation device, suction device)

- power plug 380V/32 A slow fuse

- installation in closed room

- one operation person required, ventilated air (2,500 m³/h) should be extrected to outside.

Seperation of two glass parts and exposure of inside tube layer:

• Opening of protective cover.
• The dismantled, ventilated picture-tube, tension ring removed, is placed by hand under protective cover in facility, cathode facing up.
• Mechanical height adjustment of tube (adjustment device under work table reaches up through table cutout).
• A prepared wire is attached to the tube at the jointing seem between front and backward part of tube.
• Closing of protective cover.
• Automatic release of power supply when cover is closed. Mechanical release of low-voltage power supply to wire. The wire heats up (serveral hundered degrees below glowing temperature) and transfers heat the tube.
• Due to different ability to expand of the and the backward glass, the tube gets under mechanical tension. Automatic shut-down of power supply (timelock) after 90 seconds and automatic short-term ventilation (5-8 seconds) of jointing seem. After shut down of heating process, the tube gets under thermic-mechanical tension and cracks up at the seem (cracking meachism).
• As a result, you obtain two serparated parts and a clean dismantling line at the jointing
• The above described process runs automatically when button is pressed by hand.
• The opening of the protective cover shuts down the power supply of all electronic devices.
• The backward part of the tube (facing up) can be removed manually from the box and stored in container. The exposed steel shadow-mask can then also be removed and stored in container. The inside layer of screen is now accessible and can be removed.

Removal of inside layer from front glass:

• The screen is placed under second cover, which is accessible through a limited opening.
• In the over, there is a brush tip with a connected suction device. Operation of suction device with brush tip which is kept under vacuum. Removal of fluouresentic layer, including the inside aluminium layer. As a result, the front glass looks as clean as „polished“.
• With an automatic transmission measurement adjusted to a transmission of 53%.
• Cleaning of brush over a grid which is kept under vacuum under ventilation cover.
• After shut-down of suction device, the clean screen glass can be removed from the box and stored in a container. It can now be recycled to a high-quality substance.