Sustainable Rice Husk Ash-Based High-Temperature Insulating Materials
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Sustainable Rice Husk Ash-Based HighTemperature Insulating Materials V. Stein1, T. Schemmel1 Abstract: A typical bulky insulation material applied in steel-making practice is rice husk ash. This natural raw material is CO2-neutral, sustainable and available in large amounts. Based on this outstanding raw material a newly shaped high-temperature insulation material was developed. Its properties are in the typical range of other state-of-the-art high-temperature insulation materials. Furthermore, a variety of classification temperatures up to 1540 °C have been realized with this new product family. By using the natural raw material rice husk ash, a sustainable and eco-friendly insulation material was created. The present work will give an overview about the new material, its production and properties, as well as practical application examples. Keywords: high-temperature insulation, rice husk ash, sustainable, CO2-neutral, shaped material
1. Introduction Based on the outstanding raw material rice husk ash a newly shaped high-temperature insulation material was developed. Rice husk ash as an eco-friendly and sustainable insulation material with a high refractoriness and availability offers a lot of benefits that can be transferred to the newly developed shaped insulating material. The properties of this new material family are in the typical range of other state-of-the-art high-temperature insulation materials, like fibre-based materials, plates, boards or wool [1–3]. The material is available as board, as well as standard brick shapes, and can be applied in various high-temperature applications. The main task is to decrease the thermal profile in the lining to protect the steel shell of the furnaces against over-
heating and to avoid energy losses. The present work will give an overview about the new material, its main raw material, production and properties, as well as practical application examples.
2. Rice husk ash Rice husk ash is a well-known bulky state-ofthe-art insulation material for the thermal insulation of steel ladles, tundish or cast ingots. Rice husk ash is a by-product of rice processing. After the rice harvest the rice grain itself is separated from the rice husk in a rice mill. Rice husk is used as a combustible for the production of thermal energy. For example, rice husk is used in modern biomass power plants. In addition to thermal energy, the product of rice husk combustion
is the emitted CO2 and H2O, the insulating material rice husk ash (Figure 1). The ash itself has a unique microstructure with a very high and well-defined microporosity, which is responsible for the excellent thermal insulation properties. Furthermore, the ash is very rich in SiO2. This combination of chemical composition (Table 1) and high microporosity (Figure 2) leads to a natural insulating material with a high refractoriness. Table 2 shows its thermal conductivity. The combustion of rice husk is climate neutral. Only the amount of CO2 that is stored by the rice plant during its growth is released during the combustion
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