How are iron-silicate products made?

Aurubis AG is the largest copper producer in Europe and, in addition to copper, copper products, precious metals and other metals, the company also produces iron-silicate products for Peute Baustoff GmbH.

Apart from copper and sulphur, about 30 % of the copper concentrates fed into the smelting process consists of mineral-bound iron. An iron-silicate melt is produced pyrometallurgically by adding silica sand at a temperature of about 1,250°C.

This molten phase is produced in a special cooling process in the form of two basic products in accordance with DIN 4301.

Iron-silicate stone

When cooled down slowly in large cast iron pots, a high-grade crystalline stone is produced with edge lengths of up to 1,000 mm.

About 95 % of this consists of the mineral olivine and is comparable with magmatic rock, such as basalt, diabas or gabbro.

The iron-silicate stone is processed in a crushing and screening plant at PBG into construction materials with the grain sizes and weight classes usual in the trade.

Iron-silicate granulate

An amorphous granulate is produced after sudden cooling in a water jet.