Company cases about Slurry Electromagnetic Separator & Rotary Grate Magnet Eliminate Ceramic Glaze Black Spot Defects

Slurry Electromagnetic Separator & Rotary Grate Magnet Eliminate Ceramic Glaze Black Spot Defects

2026-06-13

Imola Ceramics Group, a top ceramic enterprise in Italy’s Sassuolo ceramic base, completed the technical upgrading of its glaze production line in June 2026. Fine weak magnetic iron impurities in the glaze have long caused black spots and pinholes on finished tiles after firing, resulting in a high defective rate and only 78% yield of high-end ceramic products.

The factory adopted a targeted impurity removal solution. After ball milling, a 13000GS self-cleaning rotary grate magnet is applied to dynamically remove coarse iron impurities and solve material accumulation and blockage problems during glaze circulation. Before glazing, a high-gradient slurry electromagnetic separator is configured to capture ultra-fine magnetic particles of 0.5–5μm.

After the transformation, the iron content of ceramic glaze dropped sharply from 0.45% to 0.08%. The black spot defect rate of finished products is reduced by 92%, and the yield of high-end tiles is increased to 96%. The enterprise saves about 95,000 Euros in scrap loss every month, effectively improving product added value and market competitiveness in the European high-end ceramic market.

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