Microsoft PowerPoint - Kankberg en.ppt

Drying of Tellurium concentrate
Boliden Mineral AB for Kankberg expansion
This project
Boliden Mineral AB expands there
facilities in Kankberg.
Torkapparater delivered a drying
process which is to be used to dry
dewatered filer cake consisting of
Tellurium concentrate.
YEAR OF DELIVERY:
2012
TECHNOLOGY:
Indirect dryer, Bojner systems.
TREATED MATERIAL:
Tellurium concentrate.
EVAPORATION CAPACITY:
9 kg/h
DRYNES IN/OUT (wt%):
75 / 99
HEAT SOURCE:
Hot water
HEAT RECOVERY:
Steam concentrate is returned to
Bolidens heating system.
SCOPE OF DELIVERY:
One tubular dryer with material
handling system, shunted hot
water loop and ventilation system.
Alternative solutions
We offer tailor-made systems for
drying of all types of solid
materials – indirect systems in one
or two steps being our specialty.
Besides steam, exhaust gases,
thermal oil, etc can be applied as
heat source. We also offer direct
drum drying which is a simple and
robust technology, however with
less opportunities for heat
recovery and elimination of fire
hazards. Please get in touch with
us and explain your situation!
Dewatered Tellurium concentrate is
delivered in batches to the dryer from a
mechanical press filter through a material
handling system equipped with load cells
to ensure an even feeding rate of the
material into the dryer.
The hot water is circulated in a shunt
system by a pump where the water is
heated in a heat exchanger with steam
supplied to the process by Bolidens steam
system. The condensate after the dryer is
returned to Bolidens system.
The drying process takes place in a
indirectly heated rotating dryer heated by
hot water. The hot water flows within the
mantel surfaces and heats the dryer.
Preheated air is used as ventilation in the
dryer to evacuate the evaporated water
from the dryer. The air is ventilating the
dryer by fans before and after the dryer.
Ventilation Air
Wet Material
Hot Water System
Indirect Dryer
Steam
Condensate
Dried Material
Ambient Air
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