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maintenance-free finish, which lessens the carbon emissions usually associated with the upkeep of non-galvanized steel. Mick Jackson from Joseph
Ash
Galvanizing says: “Imagine a bridge made from non-galvanized steel. It would need maintenance every year to protect it from rust and corrosion. It would also need repainting at regular intervals. This requires paint, a workforce, transport for the workers and a means to protect the land or water below from paint contamination. This maintenance is not required if the same bridge is made from galvanized steel,
therefore carbon emissions are greatly lessened.”
Is the galvanizing process environmentally friendly? Galvanizing plants are self-contained, with steel going in at one end and the final product coming out at the other.
Modern galvanizing plants also use zinc very efficiently throughout the galvanizing process. For example, excess metal from the dipping process deposits back into the galvanizing bath. Zinc that oxidises on the surface is removed as ash and recycled, and dross from the bottom of the bath is routinely removed and has a high recycling value. Other process consumables,
such as
hydrochloric acid and flux solutions, have important recycling or regeneration routes. Spent hydrochloric acid solutions are used to produce iron chloride for treating municipal wastewater, for example. Closed-loop flux
ADF10_Metal supp_Joseph
Ash_DPSAdv.indd 3 ADF OCTOBER 2022
recycling is also used in many plants, and improved monitoring and maintenance of flux tanks reduce the volume of solids for disposal. Compared to other coating technologies galvanizing uses low volumes of water, with plants rarely discharging wastewater. Any wastewater generated can be treated and reused, with only small volumes of stable solids requiring external disposal. While not considered a particularly energy- intensive
sector, the galvanizing also has set targets industry for energy efficiency
and improved energy management. New technology has seen improvements in burner efficiency, bath lid efficiency, and reuse of waste heat to warm pre-treatment tanks. Plant emissions are also carefully controlled to ensure neighbouring communities are not adversely affected.
A solid commitment to the circular economy Stuart Whitehouse, managing director at Joseph Ash Galvanizing, said: “We count ourselves fortunate to be involved with such a sustainable product, playing, as it does, a critical role in extending the life of steel structures by decades. In addition, reducing our environmental impact has been close to our hearts for many years, hence our heavy investment in fume capture and recycling by-products.” We firmly believe in a circular economy, where the needs of present-day society are met, without compromising the ability of
future generations to meet their needs.” Please contact Joseph Ash Galvanizing to find out more about galvanized steel or the sustainability processes.
Proud to Galvanize the UK Joseph Ash Galvanizing provides hot dip galvanizing, spin galvanizing, shot blasting, powder coating and duplex coatings. As a UK leader of steel finishing services, with a long heritage dating back to 1857, the company is proud to galvanize the UK. With nine plants across the country –
serving many types of customers from large construction companies and fabricators to housebuilders, architects and developers – we’re pleased to provide the highest standards of corrosion protection available. Joseph Ash Galvanizing also offers a one-stop-shop service from its Joseph Ash Medway plant, supplying all metal finishing treatments from a single location.
0121 504 2573
www.josephash.co.uk
03/10/2022 10:06
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