-
8/8/2019 Copper and Aluminum Recycling
1/8
copperan d
a luminumrecycling
Brass
Brass is any alloy of copper and zinc;the proportions of zinc
and copper
can be varied to create a range of brasses with varying
properties.
Brass is a substitutional alloy. It isused for decoration for
its bright
gold-like appearance; forapplications where low friction is
required.
http://www.docu-track.com/buy/http://www.docu-track.com/buy/
-
8/8/2019 Copper and Aluminum Recycling
2/8
three types of brass
yellow brass
red brass
semi-red brass
This is the most commonly used brass.Used in popular items such
as faucets and
keys. Yellow brass usually contains around60% to 70% copper, 30%
to 40% zinc andtrace amounts of lead and tin.
Red brass is commonly made up of 85% Copper, 15% Zinc and very
smalltraces of Lead and Tin. Common usesare sprinklers and shut off
valves.
This has modernly
replaced red brass. Thecommon element alloysare 80% copper, 10%
zinc,5% tin, 2-3% lead andother trace elements.
LeadDis-solved
Endanger-ing human
health
To enhance the machinability of brass, lead is often added
inconcentrations of around 2%. This lead is present on thesurface
of the material, and thus presents a health concernsimilar to that
of pure lead.
How to solve
this?
http://www.docu-track.com/buy/http://www.docu-track.com/buy/
-
8/8/2019 Copper and Aluminum Recycling
3/8
Brass Scraps Melting Brass BilletsPre
Melting
Method
Non -Lead
Dissolved
Before being melted, Brass scraps must be lead-free. Theres a
method we can
use to remove a lead along brass surface:
ELECTROLYTIC-PLATING
B R A S S N
HE
AmmoniumSalt
The lead-containing copper-basedalloy is immersed into a weak
acidicor neutral etching solution having abuffer effect which is
formed byadding an organic acid into acomplexing agent having a
highability to form a complexing ion withlead, and lead particles
present onthe surface of the lead-containingcopper-based alloy are
thenremoved.
http://www.docu-track.com/buy/http://www.docu-track.com/buy/
-
8/8/2019 Copper and Aluminum Recycling
4/8
Bronze
Bronze is a metal alloy consistingprimarily of copper, usually
with tin
as the main additive, but sometimeswith other elements such
as
phosphorus, manganese, aluminium,or silicon.
Bronze Recycling
HEATING
REMELTING
RECASTING
http://www.docu-track.com/buy/http://www.docu-track.com/buy/
-
8/8/2019 Copper and Aluminum Recycling
5/8
gathering of chips
separationof cutting liquid
chips remelting
Bronze Chip Recycling
Problems of Chips Remelting
the chips have relatively small volume but
large surface area
chips are oxidized during remelting
most of the metal is burned and does not melt
http://www.docu-track.com/buy/http://www.docu-track.com/buy/
-
8/8/2019 Copper and Aluminum Recycling
6/8
SolutionCompaction
Oxidation only at the free surfaceRelatively free oxidation at
the center
Aluminum
Aluminum is very useful to humancivilization. The versatility of
aluminummakes it the most widely used metalafter steel
Why Aluminum?
Light Weight
Corrosion Resistance
Electrical and Thermal Conductivity
Ductility
Impermeability and Odorless
Recyclability
http://www.docu-track.com/buy/http://www.docu-track.com/buy/
-
8/8/2019 Copper and Aluminum Recycling
7/8
Why We Need toRecycle Aluminium
Aluminum can be recycled over and over without breakingdown. In
theory, if we recycled all our aluminum, wed never
have to make more.
In fact, it takes 95% less energy to make aluminum frombauxite
ore than to recycle old aluminum into new.
It takes about 400 years for aluminum to break downnaturally
What can you do?
Rinse out containers with clean water
Remove and throw away any plastic nozzles or lids
Remove any paper labels
Organize aluminum into its own separate section
Take your aluminum to your local recycler
http://www.docu-track.com/buy/http://www.docu-track.com/buy/
-
8/8/2019 Copper and Aluminum Recycling
8/8
Whatdoes therecycler
do?
http://www.docu-track.com/buy/http://www.docu-track.com/buy/
