Download - SPP Particle Size Analyzers
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Sparrows Point
On-line PSA
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SPP facts
SPP production: 80,000 mt/month of slag grade 120;Blaine target: 4700; fineness target: 8.0 - 12.0
2 to 3 type of raw slag used @ 100% or mixed 2 process lines
closed circuit w/ Aerofall ball mill @ 56 T/h andHumbolt-Wedag 2nd generation seperator @ 60 T/h.
PSAs on each line LUCIE installed on one process line since July 2003
but not fully operational
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Quality control overview
Pre-production: Quality lab has 24 to 48 hours toreview chemistry of raw slag and predict relativehydraulic potential of the slag
In production: Product fineness
Post-production
Physical testing: SAI or compressive strength,
air content, retention on a 325 sieve, Blaine Chemical testing: sulfide sulfur and sulfur
trioxide
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Past issues
Oil on windows
corrective actions: heatless dryer
Blockage of motor corrective actions: add air flow at auger level to flush
product and increased fuse amps
Inconstant flow: at mill stoppage and unidentified
events corrective actions: increase diameter of holes #1 and #3
to 3/8" in flute protecting sampling system screw inchute
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Modifications
sdsfsdfs
fdg
fdg
df
Flute: holes changesAir flow at auger level
air
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Quality control parameters
Dv(50) ~ damper position for large scale
control
%
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Control logic for damper position
2 * 4-20 mA signals sent to plant PLC:
Dv(50) scaled to 7-13 :
Particle size target is correlated to chemical compositionanalysis (X-Ray test every 6 hours)
MALVERN Plant PLC4-20 mA
Plant
equipment
Part_size PV
7-13
Operator OR
Wonderware
OR LUCIE
%
correction
Process-
Part_size
SP
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Control logic for damper position
[Dv(50)] Damper position
correct.
Average time Wait time
< 0.2 0% 5 min 10 min0.2[Dv(50)] < 0.3 1% 5 min 10 min0.3[Dv(50)] < 0.4 2% 5 min 10min0.4[Dv(50)] < 0.5 3% 5 min 10 min0.5[Dv(50)] < 0.6 4% 5 min 10 min
0.6[Dv(50)] 5% 5 min 10 min
Currently:
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Control logic (ctd)
In June, when LUCIE is controlling the
system,
Use of Dv(50) to control damper position
Use of %
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Control logic (ctd)
[Dv(50)] correction Average time Wait time
< 0.2 0% 5 min 30 min0.2[Dv(50)] < 0.3 ? 5 min 20 min0.3[Dv(50)] < 0.4 ? 5 min 20 min0.4[Dv(50)] < 0.7 5% 5 min 10 min0.7[Dv(50)] < 1 7% 5 min 5 min
1[Dv(50)] 10% 5 min 5 min
separator
damper
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Reliability&Utilization
Machines have not been in automatic mode
for more than 1 day
LUCIE team at SPP in June 04 to finalize
installation on A mill circuit and set the
controls to both circuits.
Performance and benefits will be monitoredonce data have been gathered.
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Next steps
Installation of LUCIE on process line A
Change correlation between Part. Size target and
each type of raw slag Monitor Dv(50) (actual, target and STD), %
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Unresolved issues
Flow of product which creates drift of
reading and long term instability
Needs of close monitoring of the machine
We hope to solve those issues by adding
auto air purge to fight the stickiness of the
product on the walls of flute. This purgewould be controlled from the control room
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Thank you
Questions? Comments?
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Current system
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Process overview