Silicatic Aluminum Melt Filters

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This invention relates to porous ceramic filter structures specially designed for filtering molten aluminum. The filters utilize surfaces made from specific silicate minerals (such as feldspars and their analogs, and iron silicates) that can selectively remove dissolved elements like sodium, iron, and calcium, or inclusions containing these elements, from the molten aluminum. The surface can either facilitate chemical reaction with these elements or act as an absorbent. The filter may be provided either as a coated material or as a full filter, both finalized by heat treatment.

Use CasesContent extracted from patent full text and abstract with AI.

• Filtering impurities from molten aluminum during metal casting or recycling processes
• Producing higher-quality aluminum products by removing unwanted metallic and non-metallic inclusions
• Use in aluminum foundries and metal processing plants to enhance product purity
• Possible adaptation for filtering other non-ferrous metal melts by tailoring surface composition

BenefitsContent extracted from patent full text and abstract with AI.

• Improved removal of unwanted dissolved metals and inclusions from aluminum, leading to higher purity
• Chemically tailored surfaces enable more efficient and selective filtration
• Can be produced as either a coating or a bulk filter, providing versatility in application
• Thermal treatment improves filter durability and performance
• May reduce processing costs by increasing yield and minimizing contamination losses

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Inventors & Applicants

Patent Abstract

Poröse keramische Filterstrukturen für die Aluminiumschmelzefiltration weisen eine Oberfläche auf Basis von Feldspaten (Albit – NaAlSi3O8, Sanidin/Mikroklin/Orthoklas – KAlSi3O8), Feldspatvertretern (Leuzit – KAlSi2O6, Kaliophilit/Kalsilit – KAlSiO4, Nephelin/Carnegieit – NaAlSiO4), Eisen(II)-Silikaten, wie Fayalit Fe2SiO4 und Grünerit FeSiO3, oder Eisen(III)-Doppelsilikaten, beispielsweise Akmit NaFe[Si2O6] und Andradit Ca3Fe2[SiO4]3, auf, um aufgrund ihrer chemischen Ähnlichkeit die Abscheidung der gelösten Elemente Na, Fe und Ca oder Einschlüssen auf Basis dieser Elemente zu ermöglichen. Alternativ können die Filter eine ungesättigte Oberfläche in Bezug zu aus der Schmelze zu entfernenden gelösten Elementen besitzen, so dass ein Reaktionspotential gegenüber diesen Elementen vorliegt. Die angestrebte Oberfläche kann in Form einer Beschichtung oder als Vollfilter angeboten werden und erhält ihre Endeigenschaften durch eine thermische Behandlung.