Effect of leaching with 5–6 N H2SO4 on thermal kinetics of rice husk during pure silica recovery

Journal of Advanced Research

Muhammad R. Abdul Karim¹  Sajjad Ahmed²  Ehsan Ul Haq²  Waqas M. Baig³  Muhammad Ali³  Waheed Ahmad³  Ather Ibrahim³ 

[1] Department of Applied Science and Technology, Politecnico di Torino, Italy;Department of Engineering for Innovations, University of Salento, Lecce 73100, Italy;Institute of Advanced Materials, Bahauddin Zakariya University, Multan 60800, Pakistan;

关键词: Acid leaching;    Thermal kinetics;    Rice husk;    Flynn and Wall expression;   

DOI  :  10.1016/j.jare.2015.01.007

来源: DOAJ

【 摘 要 】

Rice husk is a potential source for renewable energy and silica. To extract the maximum amount of silica, usually the rice husk is treated with strong acids that burn the organic part leaving behind a black residue. In this research, sulfuric acid is used as an oxidizing agent. Efforts are focused to find out more about the behavior of acid-treated rice husk by using thermal exposure, and results are compared with results for raw rice husk which is thermally exposed but not acid treated. Reaction ratio of rice husk combustion and energy of activation were calculated using the thermogravimetric data. Acid treatment was found influential in initiating degradation earlier compared to raw husk and an overall increase in value of activation energy was observed when heating rate was increased.

【 授权许可】

Unknown