Wastewater Treatment of Flux Slurry

In recent years, the topic of what to do with wastewater from fluxing operations has gained a lot of attention in light of heightened environmental awareness and compliance. Years ago, wastewater from cleaning slurry booths, waste flux slurries etc. were simply diluted and dumped down the drain. Some manufacturers are still following this practice, but it is become less and less common. Today, the heat exchanger manufacturers are faced with what to do with wastewater more and more.

Some manufacturers collect the waste slurries and effluent from cleaning out the fluxing stations and allow the flux to settle out. The water phase is then decanted and collected until a sufficient volume is collected. At that point, a waste disposal company is called in to collect and treat the contaminated water. This is an expensive, but in many cases a necessary option. If the collected water is relatively clean and not contaminated with oil, it may be reused to top up flux slurries. The only problem here is that one must be certain that there are no other contaminants in the wastewater other than flux ions. If there are other contaminants (and there almost certainly will be), tests should be performed to ensure that these will not in any way interfere with the brazing process.

Solvay Fluor also developed a continuous process to reuse and recycle wastewater in a fluxing operation. It is based on the principles described above, only in a continuous fashion:
Lauzon, D.C., Swidersky, H.W., “Methods for Eliminating Wastewater from Flux Slurries in Non-Corrosive Flux Brazing”, VTMS 2001-01-1764, pp 649-654, 2001.

1 Kommentar
  1. Dave Weilder
    Dave Weilder sagte:

    I came across your article on wastewater treatment of flux slurry and found it to be informative and insightful. It’s inspiring to see companies taking proactive measures to ensure the responsible management of their waste materials and protect the environment.

    Your discussion on the importance of properly treating flux slurry wastewater, including the potential environmental impact if left untreated, was insightful. It’s essential for companies to be mindful of the impact their operations have on the environment and take the necessary steps to minimize their footprint.

    I appreciated your explanation of the various methods for treating flux slurry wastewater, such as sedimentation and filtration. It’s encouraging to see the technological advancements being made in wastewater treatment and the potential for companies to implement sustainable solutions.

    Your focus on the benefits of recycling flux slurry and reducing waste was also commendable. It’s essential for companies to adopt a circular economy approach to their operations and explore ways to reduce waste and promote sustainability.

    Overall, your article was a valuable resource for anyone looking to learn more about the responsible management of wastewater from flux slurry. Thank you for sharing your knowledge and expertise on this important topic and highlighting the importance of environmental responsibility.


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