The first flow diagram illustrates the process of glass container production, and the second
diagram shows steps in the process of recycling used glass. ! !
We can see that glass is made using three main raw materials, and that the manufacturing process
consists of four distinct stages. It requires five steps to turn used glass into new glass products. ! !
At the first stage in the production of glass, sand, soda ash, limestone and other chemicals are
mixed together. Next, this mixture is heated in a glass furnace at approximately 1500℃ to produce
molten glass. The molten glass can then be shaped, by blowing, to create the end products,
namely glass containers.
Glass recycling begins with the collection of used glass products. The collected glass is sorted
according to its colour, and then washed in order to remove any impurities. At the fourth stage of
recycling, the glass is crushed and melted, and the resulting molten glass can finally be moulded to
create new items.
The
first
flow diagram illustrates the process of
glass
container production, and the second
diagram
shows
steps in the process of recycling
used
glass
. ! !
We can
see
that
glass
is made
using three main raw materials, and that the manufacturing process
consists of four distinct stages. It requires five steps to turn
used
glass
into new
glass
products. ! !
At the
first
stage in the production of
glass
, sand, soda ash, limestone and other chemicals
are
mixed
together.
Next
, this mixture
is heated
in a
glass
furnace at approximately 1500℃ to produce
molten
glass
. The molten
glass
can then
be shaped
, by blowing, to create the
end
products,
namely
glass
containers.
Glass recycling
begins
with the collection of
used
glass
products. The collected
glass
is sorted
according to its
colour
, and then washed in order to remove any impurities. At the fourth stage of
recycling, the
glass
is crushed
and melted, and the resulting molten
glass
can
finally
be
moulded
to
create new items.