Lignite is known as low rank coal. As a
result, it has less demand and limited in utilization.
Because lignite has a low calorific value of combustion,
high sulfur and water content, accordingly it is
necessary improving the quality of that coal. One of the
efforts that can be done is through the process of
Upgrading Brown Coal (UBC) with a heating technique.
This study aims to determine the effect of heating
temperature on the UBC process conducted by using a
solution of benzene and low sulfur wax residue (LSWR),
so as to increase the minimum 50% lignite calorific
value with inherent moisture content of a maximum of
5% and may decrease the value of volatile matter.
Lignite with a particle size of 8 mesh are mixed with
LSWR as additive and solution of benzene with a ratio
of 1 g : 0.5 mL. Then, it was heated with heating
temperature of 100oC, 125oC, 150oC, 175oC, 200oC for 1
hour. Lignite that had been treated were then analyzed
for parameters of inherent moisture, ash content,
volatile matter, fixed carbon and calorific values. The
analysis shows the heating temperature of 125oC can
produce coal with the highest improvement of calorific
value namely 54.23% with a calorific value that is 5,735
cal/g, inherent moisture is 4.02%, ash content is 8.13%,
volatile matter is 44.27% and a fixed carbon is 43,55%.
This treatment can raise the rank of brown coal into
sub-bituminous coal rank.
Keywords : Benzene; Brown Coal; Lignite; LSWR; Temperature; Upgrading.