Rice Husk Ash
Rice Husk Ash
Rice husk ash (RHA) is a byproduct obtained from the burning or combustion of rice husks, the protective outer coverings of rice grains. It is a powdery substance that remains after the rice husks are subjected to high temperatures, usually during processes such as power generation, rice milling, or industrial combustion.
One of the notable characteristics of rice husk ash is its high silica content. It typically contains a significant amount of amorphous silica (SiO2) along with other minerals. The silica content can range from 80% to 95% depending on the specific conditions of the burning process. This high silica content makes rice husk ash valuable for a range of applications in various industries.
Rice husk ash has several potential uses in different industries, including:
- Construction Materials : Rice husk ash can be used as a supplementary cementitious material in the production of concrete and other construction materials. It can enhance the strength, durability, and workability of concrete and reduce the amount of cement required.
- Agriculture and Horticulture : Rice husk ash is used as a soil amendment and fertilizer in agriculture. It provides silica and other nutrients to the soil, improves soil structure, increases water holding capacity, and helps in pest and disease control.
- Waste Water Treatment : The high silica content in rice husk ash makes it useful for wastewater treatment. It can be employed as an adsorbent to remove heavy metals and other pollutants from contaminated water.
- Ceramic and Refractory Industries : Rice husk ash is utilized in the production of ceramics and refractory materials due to its high silica content and its ability to enhance mechanical properties and reduce firing temperatures.