Recycling: glass, metals and TetraPack

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Recycling of household waste


The new glass is made from sand, soda and lime, worn 1500 / 1600 ° C.
The waste glass collected is remelted and reshaped for a new use.

Glass recycling benefits:

  • He avoids tap into the natural raw materials.
  • 25% recycling consumes less energy compared to the production of new glass.
  • The amount of soda used to lower the melting point when redesigning is divided by 3.


In household waste, it is mostly steel and aluminum, which are subject to material recovery.

a) Steel

Steel is separated from other metals by a magnet. It can be recycled indefinitely without loss of quality. Either scrap is consolidated to 100% and formatting for reuse or it is added to the cast after the blast furnaces to give new steel.

Benefits of recycling:

  • Save raw materials (coal and iron ore).
  • Saving energy up -70%.

b) aluminum

Non-ferrous metals are recovered using an eddy current separator and hand. The aluminum is melted into ingots and reused.

Benefits of recycling:

  • Raw material savings.
  • Saving energy up -95%.

Beverage cartons

These cartons are the milk or fruit juice bricks of the "Tetra Pak" style. They are made of cardboard covered with thin layers of aluminum and polyethylene. It is therefore a composite material rather difficult to recycle. These cartons are sorted by hand, either using "eddy currents" (which identifies the aluminum) or by a specific optical sensor sensitive to the specific light reflected through the polyethylene layer. The cardboard fibers are separated from the other elements in a bath then recycled (see recycling of paper and cardboard). The "waste fraction" (aluminum and polyethylene) can be valorised in several ways:

  • Stationery; it is incinerated (the polyethylene has a high calorific content) and provides the energy needed for drying paper. The remaining aluminum oxide can be redesigned to give new products.
  • In cement: polyethylene is valued energy through incineration. Aluminum is used as catalyst in the production of cement.
  • In the plastics industry: reduced grain, it will enter into the composition of new plastics.

Learn more and Links

- Recycling paper, cardboard and plastic
- our garbage
- Directory of recycled products


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