Study of operating conditions of silica extraction from rice husk for Special use in rubber

Shiva, Mehdi; Golmohammadi, Morteza; Fekri, Mohammad Reza

Study of operating conditions of silica extraction from rice husk for Special use in rubber

Document Type : Original Research

Authors

M. Shiva ¹

M. golmohammadi ²

M. R. fekri ¹

¹ Chemical Engineering Department, Birjand University of Technology

² Chemical engineering Department, Birjand University of Technology

Abstract

Research subject:

As a low price biomass, rice husk is able to accumulate a large amount of silica in its texture. The process for extracting this silica is greener than the conventional ones. The present research addresses the effects of the different process parameters on amorphous silica extraction from rice husk through a precipitation method.

Research approach

In the extraction process, first the rice husk was burned in the open air and then turned into white ash in an electric furnace. This ash was converted into sodium silicate solution using NaOH, and finally the silica was precipitated from this solution by sulfuric acid. The effect of solid to solvent ratio, the duration of the alkaline dissolution step as well as the pH and temperature of acid precipitation step have been investigated. Moreover, a special application of the amorphous silica in rubber industry was also investigated.

Main results

The results showed that a low solid to solvent ratio at the alkaline dissolution stage as well as an acidic pH along with a high precipitation temperature are required to obtain the highest production efficiency and to obtain high purity amorphous silica. The purity and chemistry of obtained silica were quite similar to commercial sample in the rubber industry; however, the surface area and pore volume of obtained silica was less than the commercial one. It was also found that prolonging the alkali dissolution step slightly increases the production efficiency. The obtained silica exhibited very close performance to the commercial sample, in the rubber-to-fiber adhesion system (RFS). This indicates the high ability of precipitated silica to be replaced by commercial types, which are mainly produced by more cost-effective and less biocompatible processes.

Keywords

Biomass

Alkaline extraction

Precipitated silica

Adhesion of rubber to fibers

Subjects

Composite

[1] Soltani, N., Bahrami, A., Pech-Canul, M., and González, L., Review on the physicochemical treatments of rice husk for production of advanced materials, Chem. Eng. J., 264, 899-935, 2015.
[2] Hossain, S.S., Mathur, L., and Roy, P., Rice husk/rice husk ash as an alternative source of silica in ceramics: A review, J. Asian Ceram. Soc., 6(4), 299-313, 2018.
[3] Patel, K.G., Shettigar, R.R., and Misra, N.M., Recent Advance in Silica Production Technologies from Agricultural Waste Stream, J. Adv. Agric. Technol., 4(3), 274-279, 2017.
[4] Subbukrishna, D., Suresh, K., Paul, P., Dasappa, S., and Rajan, N., Precipitated silica from rice husk ash by IPSIT process, in Editor (Ed.)^(Eds.): ‘Book Precipitated silica from rice husk ash by IPSIT process’ (2007, edn.), pp. 7-11.
[5] Tyagi, V., Pandit, S., Sharma, A., and Gupta, R.K., Extraction and characterization of silica from rice husk for use in food industries, Extraction, 2(4), 50-53, 2017.
[6] Fernandes, I.J., Calheiro, D., Sánchez, F.A., Camacho, A.L.D., Rocha, T.L.A.d.C., Moraes, C.A.M., and Sousa, V.C.d., Characterization of silica produced from rice husk ash: comparison of purification and processing methods, Mater. Res., 20, 512-518, 2017.
[7] Kalapathy, U., Proctor, A., and Shultz, J., A simple method for production of pure silica from rice hull ash, Bioresour. Technol., 73(3), 257-262, 2000.
[8] Selvakumar, K., Umesh, A., Ezhilkumar, P., Gayatri, S., Vinith, P., and Vignesh, V., Extraction of silica from burnt paddy husk, Int. J. Chemtech. Res., 6(9), 4455-4459, 2014.
[9] Costa, J.A.S., and Paranhos, C.M., Systematic evaluation of amorphous silica production from rice husk ashes, J. Clean. Prod., 192, 688-697, 2018.
[10] Ghorbani, F., Sanati, A.M., and Maleki, M., Production of silica nanoparticles from rice husk as agricultural waste by environmental friendly technique, Envir. Stud. Persian Gulf, 2(1), 56-65, 2015.
[11] Ghosh, R., and Bhattacherjee, S., A review study on precipitated silica and activated carbon from rice husk, J. Chem. Eng. Process. Technol., 4(4), 1-7, 2013.
[12] Wagner, M., Reinforcing silicas and silicates, Rubber Chem. Technol., 49(3), 703-774, 1976.
[13] Creasey, J.R., Russell, D., and Wagner, M.P., Role of silicas and silicates in rubber adhesion, Rubber Chem. Technol., 41 (5), 1300-1311, 1968.
[14] Ooij, W.V., Fundamental aspects of rubber adhesion to brass-plated steel tire cords, Rubber Chem. Technol, 52(3), 605-675, 1979.
[15] Shiva, M., Golmohammadi, M., and Ziatabar, S.A., 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 , J. App. Res. Chem. Polym. Eng. 4(3), 69-80, 2020.
[16] Seidel, A., and Zimmels, Y., Mechanism and kinetics of aluminum and iron leaching from coal fly ash by sulfuric acid, Chem. Eng. Sci., 53(22), 3835-3852, 1998.
[17] Barry, T.S., Uysal, T., Birinci, M., and Erdemoğlu, M., Thermal and mechanical activation in acid leaching processes of non-bauxite ores available for alumina production—a review, Mining, Metallurgy & Exploration, 36(3), 557-569, 2019.
[18] Hosseini, S.A., Niaei, A., and Salari, D., Production of γ-Al2O3 from Kaolin, Open J. Phys. Chem., 1(2), 23-27, 2011.
[19] Thornhill, F.S.: ‘Method of preparing silica pigments’, in Editor (Ed.)^(Eds.): ‘Book Method of preparing silica pigments’ (Google Patents, 1960, edn.).
[20] Sankar, S., Sharma, S.K., Kaur, N., Lee, B., Kim, D.Y., Lee, S., and Jung, H., Biogenerated silica nanoparticles synthesized from sticky, red, and brown rice husk ashes by a chemical method, Ceram. Int., 42(4), 4875-4885, 2016.
[21] Bakar, R.A., Yahya, R., and Gan, S.N., Production of high purity amorphous silica from rice husk, Procedia Chem., 19, 189-195, 2016.
[22] Ma, X.Y., Wang, L.L., Cui, S.P., and Wang, Y.L., A Recyclable Method for Preparation of Hydrochars and Silica from Rice Husk, in Editor (Ed.)^(Eds.): ‘Book A Recyclable Method for Preparation of Hydrochars and Silica from Rice Husk’ (Trans Tech Publ, 2014, edn.), pp. 164-170
[23] Cui, J., Sun, H., Luo, Z., Sun, J., and Wen, Z., Preparation of low surface area SiO2 microsphere from wheat husk ash with a facile precipitation process, Mater. Lett., 156, 42-45, 2015.