Preparation of silica powder from rice husk by thermal treatment and comparison of its performance with commercial silica in blend of passenger radial tire belt

Shiva, Mehdi; Golmohammadi, Morteza; Ziatabar, Seysd Ali

Preparation of silica powder from rice husk by thermal treatment and comparison of its performance with commercial silica in blend of passenger radial tire belt

Document Type : Original Research

Authors

M. Shiva ¹

M. golmohammadi ¹

S. A. Ziatabar ²

¹ Chemical Engineering Department, Birjand University of Technology

² Department of Research and Technology, Kavir Tire co., Birjand, Iran

Abstract

Research subject: The rice husk is the coating on a rice grain and a by-product of the rice milling process. In this study, the extraction of amorphous silica from this agricultural residue by thermal as well as acid/thermal treatment method was studied.

Research approach: The process was designed as follows: after burning the paddy in the open field, the obtained ash was washed with acid followed by drying. Finally, the amorphous silica was obtained by placing the prepared powder in an electric furnace (acid/thermal treatment). Also, a sample of silica was produced by eliminating the acid treatment step (thermal treatment). Afterward, the obtained silica powder was employed in a conventional passenger radial tire belt formula instead of commercial precipitated one, and whole the physical-mechanical properties, including rubber-to-wire adhesion force, were studied under normal and aging conditions.

Main results: The results of the XRD demonstrated that the silica produced in both methods were amorphous. The XRF analysis also showed that the purity of amorphous silica were 98.6% and 93.9% for the sample produced by acid/heat treatment and the heat treatment, respectively. The results of the tire test showed that the rubber-to-wire adhesion decreased slightly under normal conditions in the presence of new silica samples, but the same property under the timed conditions for the new silica samples was better than commercial precipitated silica. Other properties of the rubber compound did not change significantly in the presence of new silica grades. As a result, it can be said that rice husk has a potential to produce suitable silica for use in blend of radial tire belt.

Keywords

Rice husk

Amorphous silica

Thermal treatment

Acid treatment

Tire

Subjects

Oxides

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