tailieunhanh - Synthesis of pure silica from rice husk ash as an anti–caking agent for fertilizer industry in Vietnam
The characterization results show that the obtained amorphous silica was % purity with average particle size of 5–10 nm, and high specific surface area of 224 m2 /g. Additionally, for the first time that RHA–silica was successfully applied as an anti–caking agent for a NPK–fertilizer. A suitable content of silica was evaluated through the level of anti–caking. The testing results show that with only wt% of RHA–silica particles could replace kaolin as an anti–caking agent for the NPK–fertilizer. | Journal of Science and Technology 55 (xx) (2017) 193–201 SYNTHESIS OF PURE SILICA FROM RICE HUSK ASH AS AN ANTI–CAKING AGENT FOR FERTILIZER INDUSTRY IN VIETNAM Nguyen Huu Hieu1, 2, *, Tran Manh Hoang2, Pham Minh Hoang2, Tran Thi Thuy Tien2 1 Faculty of Chemical Engineering, HCMUT–VNUHCM 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam 2 Key Laboratory of Chemical Engineering and Petroleum Processing, HCMUT–VNUHCM 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam * Email: nhhieubk@ Received: 30 December 2016; Accepted for publication: 6 March 2017 ABSTRACT Pure silica particles have been successfully synthesized from rice husk ash (RHA) by precipitation method. The characterization of silica was performed by X–ray diffraction, X–ray fluorescence, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller specific surface area, and transmission electron microscopy. The characterization results show that the obtained amorphous silica was % purity with average particle size of 5–10 nm, and high specific surface area of 224 m2/g. Additionally, for the first time that RHA–silica was successfully applied as an anti–caking agent for a NPK–fertilizer. A suitable content of silica was evaluated through the level of anti–caking. The testing results show that with only wt% of RHA–silica particles could replace kaolin as an anti–caking agent for the NPK–fertilizer. Keywords: silica, rice husk ash, anti–caking, precipitation, fertilizer. 1. INTRODUCTION Rice husk (RH) is considered as one of agricultural waste materials. According to Mekong Delta Development Research Institute (Vietnam), RH was over 4 million tons every year in Vietnam’s Mekong Delta. Nowadays, the RH was used as burning material for thermal processes in some factories. In 2020, RH will be taken advantage in the thermoelectric industry so that a large amount of rice husk ash (RHA) will be used. However, RHA is one of the .
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