Abstract
Hafnium hydroxide filter cake and ammonium sulfate are being recovered from slurry using an expression (membrane) filter press. The process cycle time is approximately 6 hours. Each cycle produces 150 kg of cake containing 75 kg of hafnium oxide. The hafnium hydroxide filter cake has a 4 × 10 5 Pa-specific cake resistance of 10 13 m/kg and is highly compressible. Washing the cake requires two cake volumes water displacement. The four-hour wash cycle requires washing with 5.5 × 10 5 Pa pressure water while compressing the cake to 1.5 × 10 6 Pa. The expressed cake contains 55% moisture, has a dry texture, and crumbles to a powder during handling. The expression dewatering rate varies linearly with moisture content. The filter cake is nearly self-releasing from the multi-monofilament filter cloth.
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