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Each year in Germany, some 15 million tons of fine particles from gravel washing plants are collected mainly in huge tailings ponds. Across Central Europe, roughly 60 million tons of such material is...

In the Rhein-Sieg District near Bonn is the Niederpleis clay pit, situated directly next to the A 3/A 560 motorway junction. Clays have been won here since 1893, originally for making bricks, but...

In 2010, in cooperation with Rieter Werke, Keller HCW supplied two production lines for manufacturing large-sized terra cotta floor tiles to customers in Vietnam. The extruders with proven Rieter...

Even after more than a dozen years in service, the first few machines are still showing hardly any wear on their floor chains, despite the heavy forces acting on them. Just how long the floor chains...

1 Fundamental idea Two different lines of thought led to the introduction of this new design. On the one side there are customers with an extremely high requirement for ground bricks; this applies...

1 Introduction Some 150 years ago, when Friedrich Hoffmann introduced his Hoffmann annular kiln, it was a huge success, not least because it required as much as 70% less fuel than the intermittent...