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Russia's team players pose for media with their gold medals and a trophy during medal ceremony after their victory at the 2012 IIHF men's ice hockey World Championship final game with Slovakia in Helsinki May 20, 2012.

Russia world champions

Leaders take part in the NATO Summit meeting in Chicago, May 20, 2012.

Missile shield moves forward

Tomislav Nikolic, left, the nationalist Serbian Progressive Party leader and presidential candidate, and his wife, Dragica, center, cast their ballots at the presidential run-off elections in Belgrade, Serbia

Serbian nationalist ahead

A British Crown Office photo showing Megrahi

Lockerbie bomber dead

The crumbling wreck of the Rocca Estense in Finale Emilia

Aftershocks follow deadly quake

Director General of the International Atomic Energy Agency, IAEA, Yukiya Amano of Japan speaks during a news conference after a meeting of the IAEA's board of governors at the International Center, in Vienna, Austria, on Monday, March 5, 2012.

IAEA chief in Iran

Arab flags held by figures running, with Libya first, Egypt second and Tunisia third. Two outstretched hands, representing Syria and Yemen

Salafists rally in Tunisia

Lebanese security forces guard the car in which anti-Syrian cleric Ahmed Abdul-Wahid and his bodyguard were shot dead.

Syria spillover into Lebanon

Thematic image showing the Twitter logo

Pakistan tweets again after ban

Chelsea players celebrate during London parade. Drogba speaks into microphone

Chelsea cheer, Bayern glum

Nationalist Nikolic wins in Serbia

Tomislav Nikolic is Serbia's new president. What does his victory say about the country's direction?

Banner 2012

Global Media Forum

DW's annual conference focuses on shaping a sustainable world with culture, education and media.

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Study in Germany

Interested in studying in Germany? Check out all the DW information here.

  • Beautiful, but deadly

    Safely disposing of mercury

    Beautiful, but deadly

    Humans have been using mercury since ancient times. In the Middle Ages, mercury was used in alchemy and medicine. Only in modern times did it become clear that mercury is highly poisonous.

  • The paradox of energy-saving bulbs

    Safely disposing of mercury

    The paradox of energy-saving bulbs

    There's also mercury in fluorescent lighting. Although they save energy, disposal can be a problem. Energy-saving bulbs should not be thrown away with regular waste, due to the tiny amount of mercury they contain.

  • From the shredder ...

    Safely disposing of mercury

    From the shredder ...

    A fork-lift operator at the DELA recycling company in Essen, Germany, dumps a load of compact fluorescent tubes into a shredder. In order to prevent mercury from escaping, a filtering ventilation system sucks the air away.

  • ... to the silo ...

    Safely disposing of mercury

    ... to the silo ...

    The shredded compact fluorescent tubes are stored in a silo until a spiral conveyor carefully carries them to a glass-washing area.

  • ... and in the washing machine.

    Safely disposing of mercury

    ... and in the washing machine.

    Workers wash masses of broken glass from the shredded lamps to recover luminescent material and mercury from the glass shards.

  • Pure glass

    Safely disposing of mercury

    Pure glass

    Glass from light bulbs is considered valuable in industrial processes, since it can withstand high temperatures and varying levels of pressure. But producers need the purest possible material.

  • Vacuum drying

    Safely disposing of mercury

    Vacuum drying

    The glass-washing process leaves behind sludge with high mercury content. Mercury is distilled from this, like in a liquor distillery.

  • Valuable illuminant

    Safely disposing of mercury

    Valuable illuminant

    The pure illuminant is returned to the light bulb producers. They gladly pay for it, because it contains the rare earth elements yttrium and europium.

  • Distillate

    Safely disposing of mercury

    Distillate

    Pure mercury also comes out of the vacuum dryer. Since mercury is quite dense, it weighs 1.7 times as much as the same volume of iron. The amount shown in the jar here comes from 500,000 compact fluorescent light bulbs.

  • Detox

    Safely disposing of mercury

    Detox

    Sulfur is directed to the left part of this machine, and from above, liquid mercury. The combination produces mercury sulfide, which has a very stable composition and is no longer poisonous.

  • Red mercuric sulfide

    Safely disposing of mercury

    Red mercuric sulfide

    The mercury sulfide can be disposed of by storing it in old mines. This, along with rock filling, stabilizes the old mining shafts.

  • Disposal - as art

    Safely disposing of mercury

    Disposal - as art

    This piece of modern art, made from mercury sulfide, hangs on the wall at the DELA recycling company in Dorsten, Germany.


    Author: Fabian Schmidt / sad | Editor: Andreas Sten-Ziemons