New “Green” High-Temperature Insulating Materials Made from Renewable Raw Materials
Biogenic silica (rice husk ash) is the ideal and most commonly used capping material in the steel industry.
For 30 years, it has been used for thermal insulation of tundishes and pouring ladles in the steel industry. Special qualities are used in the production of ULC grades with a carbon content <25 ppm. In ingot casting, it is used for the insulation of the ingot heads and as a raw material. New is the use of its excellent insulating properties in shaped products (lightweight refractory bricks and boards). Prof. Dr-Ing. Helge Jansen (HJ), Managing Director at REFRATECHNIK Steel (Fig. 1), and his R&D team have advanced these developments and he was happy to discuss further details with us.The REFRATECHNIK Group is a global network of companies with activities in the refractories industry (e.g. the cement, lime, iron and steel, NF metals and the ceramics industry) and in industrial minerals. Founded 70 years ago, the world’s largest family-owned company for refractory products comprises 27 company sites and employs over 1700 people.