Post on 08-Dec-2015
description
transcript
Recycling2nd seminar
Content
• Introduction
• Definition
• Why recycling ?
• Types of Recycled Material
• Paper recycling
• Metal recycling
Introduction
Recycling is a pretty simple concept:
take something that isn't useful
anymore and make it into something
new instead of just throwing it away.
Definition
Recycling is the process of making or
manufacturing new products from a
product that has originally served its
purpose.
Why recycling is important
• Too Much Garbage
• Conservation
• Energy Saving
• Recycling creates jobs
Types of Recycled Material
Almost anything can be recycled.
• Paper
• Metals
• Glass
Paper Recycling
Steps to Recycling Paper
• Collection
• Sorting
• soaked in water
• Screening
• Cleaning
• Brightening
• Remove the ink
• Decolourization
• Pulp
Metal Recycling
Raw Material
FerrousNon-
Ferrous
Non-Ferrous
• Copper
• Aluminum
• Brass
• Zinc
• Lead
• Bronze
• Stainless Steel
• Carbide
Ferrous
• Cast Iron
• Coils
• Sheets
• Beams
• Borings
• Plates
• Steel Wheels
• Auto Cast
How does it works
Steps for Metal recycling
• Collection
• Sorting
• Compressing
• Shredding
• Inspection
• Melting
• Cooling
• Metal working
• Step One: CollectionScrap metal is collected from the
households as well as from the different
industries. It is then sent to the sorting
agents.
• Step Two: SortingThe metals are sorted based on their type
and composition. Metals that are similar in
composition are packed together and sent
to the recycling centres.
• Step Three: Compressing
The metals are compressed using press
machines, to reduce their capacity and
capable to move them to shredding.
• Step Four: ShreddingOnce the various metals have been
separated, they will then be fed into a
machine which cuts and shreds them into
tiny pieces.
• Step Five: Inspection
Before these metals are melted, an
inspection is conducted to see if the metals
that are similar in composition are kept
together.
• Step Six: MeltingThe metals are, later, heated in smelters.
Smelters are devices which melt big
chunks of metals at very high
temperatures. Each metal or similar
metals have different smelters because of
their different melting points.
• Step Seven: CoolingOnce the metals melt fully, they are molded
into small bars and are allowed to cool down
before they are reused. These small bars
are called ingots.
• Step 8: Fabrication
Once the metal ingots have cooled and
hardened, they are put into a machine that
rolls them into flat sheets, which form the
basis for new metal materials.
Aluminium Recycling
• It only exists in combination with oxygen,
forms an extremely hard material known as
alumina.
• Then, a powerful electric current is run
through the liquid to separate the
aluminium from the oxygen.
Process
Steel Recycling
• It is cheaper to recycle steel than to mine
iron ore and manipulate it through the
production process to form new steel.
• Steel does not lose any of its
inherent physical properties during the
recycling process, and has drastically
reduced energy (save 60%).
Process