Keeping Ceramics Iron Free At Ceramics UK

By Paul Fears | 01 July 2019

Removing problematic fine iron and weakly magnetic minerals from ceramic slips and glazes is vitally important in any ceramics plant.  Globally, ceramics companies are using high intensity magnetic separators, with working examples displayed on the Bunting and Master Magnets stand 1517 at the Ceramics UK show (10-11 July 2019, Telford, United Kingdom).

Electro Magnetic Filter at Ceramics UK

Electro Magnetic Filter

Iron Contamination

Iron contamination causes surface defects (black spots or holes), weakens the ceramic structure to crack, and reduces the whiteness of glaze.  Most of the raw materials used to manufacture ceramics contain iron bearing minerals that then enter the ceramics manufacturing process.  Bunting has a wide range of high intensity magnetic separators to remove the iron contamination or iron bearing minerals are various stages within the ceramics plant.

Raw materials, such as feldspar, zircon and silica sand, are commonly purified at source.  Most non-metallic mineral processing plants include dry magnetic separators such as the Rare Earth Roll Separator and Induced Roll Magnetic Separator.

Laboratory sized Rare Earth Roll Separator Ceramics UK

Laboratory sized Rare Earth Roll Separator

Once entering the plant manufacturing ceramic tiles, tableware, sanitaryware or figurine, magnetic separators remove iron from both the slip, glaze and spray dry powder.  The designs include simple Permanent Rare Earth Tube Magnets, commonly configured in a trap or as a grid, and Electro Magnetic Filters.  Ultra-strong Tube Magnets attract and hold fine iron, which is then periodically manually removed.  High intensity Electro Magnetic Filters attract and hold magnetic to a centrally located matrix, before initiating a self-cleaning sequence to remove all captured contamination.  At the Ceramitec show in 2018, Master Magnets secured an order for two large Electro Magnetic Filters from a Turkish ceramic producer on the stand.

An Electro Magnetic Filter, Grate Magnets and Neodymium Rare Earth Tube Magnets will be on show on stand 1517.

“The UK has such a rich history of producing high quality ceramics,” said Dave Hills, Bunting Group’s Head of Sales, “and it is a great to see the Ceramics UK exhibition, a UK-based ceramics focused event.  Our relationship with the ceramics and non-metallic minerals industry stretches back to the first days of Master Magnets.  We evolved with the industry helping reduce product loss due to iron-related defects.  We are looking forward to speaking with UK-based and international ceramics producers at the show.”

Contact Us

For more information on removing free or mineral iron in the ceramics manufacturing process, please see us on stand 1517 at Ceramics UK or contact our team on:

Phone:  +44 (0) 1442 875081


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