factories emissions are controlled by 2010/75 directives, this
other constraint also entails to focuses on these values in
Fines composition.
During 2 months, GISEMENT team has taken off samples
of Fines in order to estimate their chlorine rate, before any
sorting process. The average rate is up to the limit accepted by
cementers. Sorting processes are needed to extract chlorine
source, which the main one is PVC in NHIW and SBW.
Mercury rate is always below the standard. Therefore, any
sorting process is needed. For low heating power, results of
analysis are currently practices in an independent laboratory.
PVC density is up to water density. We suppose that it can
be extracted thanks to density: hydraulic test for example.
Thus PVC will be sorted in the same time than rubbles; this
new mix would be separated during a second step of the
whole processing line.
Empirical tests have been implemented which main
objective is to define a technological solution to sort the
rubble assimilated fraction and the organic one. Aeraulic tests
realised with a blower in front of whom, fines were projected,
showed that it is possible to separate easily heavy fraction and
the light one. Into the light fraction, GISEMENT team found
wood and polystyrene as the main components.
A hydraulic test was also implemented in the same
objective. Fines were plunged in a full water tray. Separation
between light element (wood and polystyrene) and heavy one
was instantaneity. Each of these products of hydraulic
separation represents 50% of the humid volume and light
components embody nearly 25% of the humid mass.
However, in spite of letting best results in term of separation,
liquid sorting process is not the way the SME partner of
GISEMENT, will choose at first. Indeed this kind of process
is expensive since it implies water and energy consumption,
and it needs to implement drying unit and water treatment
plant. Because of environmental and economic costs the SME
decided that this method i s a second option. Therefore,
aeraulic process was chosen to extract organic fraction of
fines. This part will be destined to complete SRF product at
the end of the sorting chain. Analyses are led to evaluate the
quantity of problematic substances which are persistent in
organic and mineral fractions.