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UNICAL SCANPOL® METHOD FOR THE
TREATMENT OF THE WASTES FROM
PHOTORESIT AND SOLDER MASK
PROCESSES AT THE PRINTED CIRCUITS
MANUFACTURE
Clean water for the future generations
• The SCANPOL® 40 method has been developed
especially for the treatment of spent
developing and stripping solutions containing
photo resist and solder mask.
• The SCANPOL® 40 method precipitates
dissolved photo resist and metals from the
solution.
• The treatment is pH-controlled and suits a
throw flow plant very well.
• The precipitated resist and the metals form
stable flocks that settles quickly and are easy
to separate using a chamber filter press.
• In the clear decant and filtrate the
concentration of metals and COD has been
significant reduced.
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• Properties of precipitation agent SCANPOL® 40:
Composition:
Mixture of acid salts
Description:
Clear, brown liquid
Specific weight:
1.350
pH:
Below 1
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• Advantages compared to iron chloride / lime method:
- The amount of sludge will be reduced.
Sludge quantity after treatment of used
developer and stripper solutions in kg/m3 of
treated solution (100% dryness)
1. Standard method (Sulphuric acid + ferric
chloride + lime)
2. SCANPOL ®815/2 + lime
3. SCANPOL® 815/2
4. SCANPOL® 40
6
5,14
5
4
3
2,32
2
1,44
1,4
3
4
1
0
1
2
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- The treatment time is very short.
Standard
method
SCANPOL® 40
8h
2h
Treatment of
5 m3 spent solution
- The COD-value and the metal content will be reduced.
Treatment of used developer and stripper
solutions. Practical results from field
3000
2500
COD
2000
SP40
1500
St.method
1000
500
0
1
2
3
4
No analysis
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5
6
7
mg Cu/L
Treatment of used developer and stripper
solutions. Practical results from field
90
80
70
60
50
40
30
20
10 0,3
0
1
SP40
Value before treatment
0,1
0,3
0,6
0,3
0,6
0,4
0,2
2
3
4
5
6
7
8
No analysis
• Equipment:
- Dosing pump controlled by pH-value.
- The dosing pump can be connected directly to the
package in which the solution has been delivered
or to a separate buffer tank in which the solution
is kept.
- Separate collecting and treatment tanks are
recommended to obtain the best result. The
treatment tank should further more be
equipped with a stirrer and a pH-meter.
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• Instructions:
- In order to obtain the best result it is
recommended that all (dry film, solder mask,
wet film) the used developing and stripping
solutions as well as rinse water from these
processes is collected in a separate storage
tank.
- The collected waste may be treated on
batch way or in a through flow treatment
installation.
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• Batch treatment:
- When SCANPOL® 40 is used with it’s original concentration, the pH-value in the treatment tank is
first adjusted to pH 8.0 - 8.5 with sulphuric or
hydrochloric acid. The exact value, which is to be
used, has to be determined by laboratory tests. .
After that SCANPOL® 40 is dosed with help of the
pH measure to the treatment tank until the good
precipitation of photoresist occur.
- When the treatment is finished, the flocculation
agent SCANPOL® 55 is added and the
precipitated resist and the metals are allowed
to settle. The clear liquid can then be tapped
and the sludge can be dewatered.
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• Batch treatment:
pH
pH
pH
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BATCH TREATMENT OF WASTES FROM DRY FILM AND SOLDER MASK
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• Through flow treatment:
- With this method, the wastes (used dry film
developer,solder mask developer, dry film
stripper, wet film developer and stripper
mixed together) may be treated continuously.
Installation for this treatment needs to have the
following steps:• Pre-neutralisation
-
• Treatment with SCANPOL® 40
-
• Flocculation
• Sedimentation (separator)
-
• Sludge holding
• Filter press
- The sludge from both treatment methods is
very easy to filtrate and achieved dewatered
cakes may reach as high as 70 % dry substance.
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• Through flow treatment:
pH
pH
pH
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NORMALISATION
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NEUTRALISATION, DOSING OF SCANPOL® 40
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FLOCKULATION
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FLOCKULATION
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LAMELLA SEPARATOR
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FILTER PRESS
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TROUGH FLOW TREATMENT OF WASTES FROM DRY FILM AND
SOLDER MASK
• Safety regulations:
- SCANPOL® 40 precipitation agent is a very
acid solution. Contact with the skin is to be
avoided. Apply normal precautions when
handling the acid solution.
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• Packing:
- Non-recurring polyethylene barrels
containing 270 kilos or IBC-containers
containing 1350 kilos.
• Storage:
- Store the solution in its original packing
separated from alkaline, organic material and
cyanides. Avoid sunshine or other heat source.
- Storage temperature: 5 - 25 C
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• Product is available at:
SCAN DRILL KB
Sandgatan 22A
602 21 NORRKÖPING
SWEDEN
Tel/Fax: 0046-11-64204 [email protected]
SCANDRILL POLSKA SC
Pelplinska 4
81-258 GDYNIA, POLAND
Tel/Fax: 0048-58-663 0128
[email protected]
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