Many of the company's processes involve acid cleaning and etching of aluminum.The resulting waste solution is neutralized and precipitated out as aluminum hydroxide. After squeezing out the excess moisture in a filter press, what remains is a filter cake with approximately 70 percent free moisture. Because the filter cake was quite sticky and difficult to handle, continuous drying was sure to be a daunting task. The continuous drying system they needed seemed out of reach -that is, until the company tested a TURBO-DRYER® from Wyssmont Co., Fort Lee,N.J. The 32-shelf rotary tray dryer is fed 70 percent wet filter cake at the top of the dryer and discharges a primarily granular product at uniform product moisture below 10 percent at its discharge.

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