The Light Bulbby Noah Shpak, Paul MacPherson, Alec Roscoe

A Break ThroughThe invention of ductile tungsten sparked the development of

the modern tungsten light bulb in 1906-10. Ductile tungsten has many favorable properties:

a high melting point: 3,410 C low evaporation rate at high temperatures: 10-4

torr at 2,757 C tensile strength greater than steel

Structure of Today’s Light Bulb

Light Bulbs of Today The Light bulb of today has:

wide, low-cost availability easy incorporation into electrical systems adaptable for small systems low voltage operation, such as in battery powered devices wide shape and size availability

The Future In the future, light bulbs will be even smaller and brighter.

Global Impacts The vast use of light bulbs makes them likely candidates for overuse and

pollution.

How to Recycle a Light Bulb

Steps to RecyclingLamps are sent to recycling center

Upon arrival at the recycling facility, lamps are removed from their containers and fed into specialized machine for recycling lamps. The entire process is fully automatic and incorporated in a container in which the air is brought to subpressure, thereby preventing mercury from being released into the environment.

Steps to RecyclingBy-product separation

With the aid of a sophisticated patented air transportation system, the phosphor powder is separated in different steps from the glass and metal by-products.

Steps to RecyclingGlass and aluminium stored

Clean glass and aluminium end-caps are separated and stored for re-use.

Steps to RecyclingMercury is isolated

The mercury bearing powder is collected in distiller barrels beneath the cyclone and the self-cleansing dust filters

Steps to RecyclingMercury is extracted

The powder is then retorted to drive out the mercury.

Steps to RecyclingElements are ready for re-use

At the end of the process the glass, metal end-caps, powder, and mercury can all be re-used.

Steps to RecyclingRecycling certificate is issued

Once the materials have been fully processed by the recycling facility, an official Certificate of Recycling will be produced and emailed to you for record keeping.

Thank You

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Mrs. Steiner's Chemistry - Part 10. (n.d.). McCann Technical School. Retrieved September 8, 2011, from http://blogs.mccanntech.org/steinerchemistry/page/10/

The Light Bulb. (n.d.). History of the Light Bulb. Retrieved September 7, 2011, from invsee.asu.edu/modules/lightbulb/meathist.html