SPP Particle Size Analyzers

8/22/2019 SPP Particle Size Analyzers

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04/11/2004APS SPARROWS POINT 1

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

Documents

SPP Particle Size Analyzers