 |
 |
 |
 |
 |
 |
 |
 |
novaFrit International - Process
The CalSiFrit process is a complete recycling process as all the components
of the spent
pot lining (SPL) are recovered from the process in commercial value-added
products. Furthermore, an interesting feature is its capability to incorporate
other wastes, hazardous or not, into the process.
Flow
Sheet: Solids
The spent pot lining, after having been dislodged from the steel infrastructure,
is crushed down to 8 mm at which time some metallic parts (aluminum and
iron) are recovered, cleaned and resold.
Together with other recovered wastes, limestone and silica are added to
the crushed SPL according to a proprietary recipe. This feedstock will
then enter a conterflow rotary kiln where it is heated, chemically modified
and melted to form a liquid siliceous matrix. This liquid matrix, over
which now floats the excess carbon, enters a second furnace where it is
refined. The carbon is recovered separately at that time.
The refined liquid matrix is then quenched in a water basin to fix its
amorphous state. The engineered product is dried and pulverized ready
for shipment.
Flow
Sheet: Gas Stream
The CalSiFrit process is 100% clean recycling process, its process gases
having gone through a complete cleaning operation prior to exiting to
the atmosphere.
All combustion and process gases are first cleaned in an after-burner
station offering treatment for PAH and CO. They are then directed to a
dry reactor via a conditioning tower for the chemical destruction of fluorine
and acidic gases before passing through high temperature membrane filtering
media ensuring the control of particulate emission.
All particulate matters trapped by the filtering elements are accounted
for and automatically re-introduced into the process feeding system.
Flow
Sheet: Water circuit
The CalSiFrit process has no liquid effluent. In fact, the water cooling
system being of the evaporative type requires some make-up (fresh) water
to maintain the optimum water level in the different cooling systems.
Water is used for equipment cooling but mostly required to quench the
liquid matrix in order for it to retain the sought-after properties. The
water in turn, is cooled down by cooling towers of the evaporative type
ensuring that no water is ever rejected in the environment. A close-circuit
water treatment is performed to maintain water qualities and the mud retrieved
is in turn returned with the feed into the kiln.
