General
& Process
- Industrial rubber
recycling is almost as old as industrial rubber manufacturing itself.
Recycling still made strong, short-term economic sense well into the
20th Century because rubber, natural or synthetic, was expensive. In
1910, an ounce of rubber cost the same as an ounce of silver. That's
one reason the average recycled content of all rubber products was
over 50 percent well into the 20th Century.
-
The
waste materials are chopped to 300–400mm pieces; then the chopped
rubber is fed in batches to charge casks; the casks are
automatically conveyed to the charging chamber; the materials are then
supplied from the charging chamber to the thermolysis reactor, to be
exposed to heating by a ubiquitous and inexpensive heat-carrying
medium during 90 minutes. At this processing stage the rubber waste
materials are thermally decomposed into gaseous and solid
products.
-
The
gas products are then supplied from the thermolysis chamber to the
separators, to be cooled; the condensed fluid flows into the
separation unit, in which the oil products of thermolysis are
separated from water and supplied to the collector unit, then poured
to tanks. 10% of the collected oil is used as power supply for the
recycling plant. The water is filtered, whereupon fed back to the
processing cycle. The non-condensable combustible gas is burnt in the
furnace to provide the heat supply for the reactor chamber. The solid
products are conveyed to the discharge chamber, to be cooled to 100–
170°C, whereupon they are unloaded into the sorting machine that
separates metal from the carbon residue.
Technology
- A new material
recycling technology for crosslinked rubber was developed using
the continuous reactive processing method. In this process of
producing reclaimed rubber; breakage of crosslinking points in the
crosslinked rubber occurs selectively under the controls of shear
stress, reaction temperature and internal pressure in a modular screw
type reactor. Deodorization during the process has also become
possible by a newly developed method. The reclaimed rubber obtained
from rubber waste generated from both manufacturing products and
post-consumer products shows excellent mechanical properties
applicable to new rubber compounds.
Report
- Recovery
Technology Inc. of Mississauga, Extruda-Rail of Calgary, and Exxadon/EWMC
are Canada's high-technology tire-recycling companies. Recovery
Technology has developed a new process for the conversion of
steel-belted tires to rubber crumb. This technology, which recovers
98% of the useable rubber from the steel, carbon, and fabric
components, has been licensed world-wide. This company also produces
matting materials for the industrial workplace and for animal stalls
and enclosures. Extruda-Rail holds international patents on a process
it developed to convert rubber crumb into lengths of extruded renewed
rubber for use in such applications as railway crossing panels and the
flange fillers that hold the rails.
- The company
supplies the entire Canadian market but exports the majority of its
production to the United States, Asia and Europe. Exxadon/EWMC has
developed a microwave pyrolysis process leading to the marketing of
the oil, carbon black and steel components of tires and has licensed
its technology to other companies in North America, Europe, the Middle
East and Russia. These large companies are doing relatively well in
the tire-recycling business, as are some small companies that fill a
specific market niche.
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