Canadian Finishing & Coatings Manufacturing - May/June '24 - 28

PLATING AND ANODIZING: FILTER TECHNOLOGY
Case Study:
Tin Sludge Management
BY KEES STIGTER
I
n the demanding world of metal plating, efficiency
and cleanliness are paramount. Resideo Technologies
Inc., a spin-off from Honeywell, known for its room
air temperature control systems, faced significant
challenges with their plating process, particularly concerning
the management of tin sludge.
THE CHALLENGE: OVERCOMING TIN SLUDGE
ACCUMULATION
At the heart of the problem was the accumulation of tin
sludge, a gel-like by-product of the oxidation of stannous
[Sn2+] to stannic [Sn4+], which forms water-insoluble SnO2.
Traditional methods of sludge removal were labour-intensive
and inefficient, with manual scooping required to clear the
settled sludge. This not only slowed down operations but also
compromised the quality of the plating process.
HENDOR'S SOLUTION: ADVANCED FILTRATION
TECHNOLOGY
Hendor introduced a Stannic Filtration System, equipped
with a bag filter utilising plasma-activated polypropylene
microfibers. This technology enables the selective filtration
of stannic tin, allowing chemical bonds to form between
the stannic nuclei and the activated fibers. Over time, the
filter accumulates sludge without clogging, significantly
streamlining the cleaning process.
Resideo implemented the new system to tackle the
persistent issue of sludge accumulation. The process began
with a thorough stirring of the stannic sludge at the bottom
of the tank, followed by running the filtration system
continuously for three days. The system demonstrated
substantial improvements:
The significant operational gains achieved
through the adoption of the stannic filtration
system illustrate the potential for similar
technologies to make substantial impacts
across the surface finishing industry.
Far left: Resideo Tin
Bath before Hendor
filter.
Left: Resideo Tin Bath
with Hendor filter
28
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Canadian Finishing & Coatings Manufacturing - May/June '24

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Canadian Finishing & Coatings Manufacturing - May/June '24 - 1
Canadian Finishing & Coatings Manufacturing - May/June '24 - 2
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Canadian Finishing & Coatings Manufacturing - May/June '24 - 40
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