CHARACTERISATION OF
CARBONIZATE PRODUCED FROM VELENJE LIGNITE IN LAB-SCALE REACTOR
ERICo Velenje, Institute for Ecological Research, Koroška 58, 3320 Velenje, Slovenia
Aachen
University, Coking,
Briquetting and Thermal Waste Treatment Group, Wuellnerstr. 2, 52056 Aachen,
Germany
Karbon, d.o.o., Partizanska 78, 3320 Velenje, Slovenia
Abstract
In year 2002 laboratory carbonization of lignite samples was done in a rotary kiln reactor at five different temperatures (550, 600, 650, 700, 750°C), four different retention times (15, 30, 60 and 120 min) and three different particle size categories (4-10, 10-20 and 20-40 mm). Later on specific surface determination of these carbonizates were carried out, because use of active carbon in industrial and chemical application may be of great importance. From the results obtained, carbonization temperature seems to be the most important factor that influences the enlargement of specific surface area. Specific surface area of raw coal is 88 m²/g and in the process of carbonization becomes enlarged almost by factor 3. The same situation (enlargement of the surface area) can be observed with enlargement of particle size. Results also showed us that retention time of 60 min is the most favorable for enlargement of the specific surface area.