HYDROCARBURES RECYCLES POUR LA FABRICATION D'ASPHALTE

RECYCLED HYDROCARBONS FOR ASPHALT

Abrégé anglais

The process of using soils that have been contaminated with
hydrocarbons and using it in the manufacture of asphalt, is the
invention submitted herewith for a patent.

Revendications

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of disposing of soil containing a
pollutant comprising:
1) passing the contaminated soil through a first
separation procedure to remove incompatible
ingredients not suited for inclusion in an asphalt
mix;
2) crushing the resulting soil to a size suitable for
inclusion in an asphalt mix;
3) sifting the crushed soil to produce a granular
output that are below a selected size;
4) combining the sifted, crushed soil with asphalt
aggregate and heating the mixture to dry it by at
least removing a substantially portion of
moisture;
5) combining the dried mixture with liquid asphalt
tar; and
6) depositing the asphalted mix on a road bed.
3

Description

CA 02245382 1998-08-17
DESCRIPTION
The objective is to take soil that has been contaminated with
fluids that do not dissipate in soil such as petroleum products and
combine it with uncontaminated soils in a process that will render
road asphalt.
The process begins by the excavation and stockpiling of
uncontaminated soil from a quarry site. The subject soil would be
excavated so that it is disturbed and fluid, then transported to
the processing site where it will be stockpiled.
A contaminated site is identified and then contaminated soil is
excavated from the said site and also transported to the processing
site when it is stockpiled.
The uncontaminated soil and the contaminated soil is then subjected
to a separating process in which incompatible ingredients,
including metals and wood, are screened from the contaminated and
uncontaminated soils. The soils are then introduced separately to
a crushing process whereby the ingredients are reduced in size to
facilitate mixing and treatment. The crushing process is carried
out using an aggregate crushing system. The fine aggregates that
result are stockpiled separately in preparation for burning and
mixing.
The contaminated soil is then analyzed to determine the level and
nature of contamination. The results of the analysis will enable
a determination of the quantities of contaminated soil to be mixed
with the uncontaminated soil in the continuing process. The pre-
determined quantity of contaminated and uncontaminated soils are
then introduced together to a drying-burning, de-contamination
process using a cylindrical rotating drum with mixing blades. The
rotating drum is elevated at the loading end so that the mixing
1.~! L.~,


CA 02245382 1998-08-17
DESCRIPTION
Page 2
ingredients rotate towards the opposite end of the drum which feeds
the composite unto a chute. The chute drains into a motorized
sifting unit which comprises a three ( 3 ) tier screening system.
The different sizes of screens separate the different sizes of
aggregate in the composite and allocates the aggregates to
individually sized holding bins.
Underneath the holding bins is a weigh scale. The individual
aggregates are then released, to their desired quantities, into the
weigh scale through the release hatches in the individual holding
bins. The desired quantities of individually sized aggregates are
then released from the weigh scales into a motorized cylindrical
rotating unit with mixing blades. Contemporaneously, with the
release of the aggregates into the motorized mixing unit, a pre-
determined quantity of liquid asphalt is released into the mixing
unit from a liquid asphalt chamber situated directly above the
mixing unit.
The aggregates and liquid asphalt are mixed to a desired
composition and are then ready to be discharged from the process
unto a transport unit for delivery to a site where it becomes
asphalt road surface.
The unique aspect of the process is the introduction of
contaminated soil to a purification process rendering road surface
asphalt.


CA 02245382 1998-08-17
SPECIFICATIONS
The manufacture of road surface asphalt involves mixing aggregates
taken from uncontaminated soils with liquid asphalt.
The invention uses aggregates that have been taken from
contaminated soils, subjecting the contaminated aggregates to a
burning process, them mixing them with liquid asphalt to produce
road surface asphalt.
The burning process facilitates the use of contaminated soils in
the manufacture of road surface asphalt.
The invention enables the use of soils contaminated with
hydrocarbons in the manufacture of road surface asphalt. It uses
and refines contaminated soils and integrates them into a product
that has similar properties.
The attached drawing shows how the process works.
~~. Z,l , i'J

Dessin représentatif