Wolastonite synthesis from rice hull ASH
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2007
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INTERNATIONAL LATIN-AMERICAN CONFERENCE ON POWDER TECHNOLOGY, 6th
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A Rice hull ash (RHA) is a industry scrap rich in amorphous silica. A simple and lowenergy cost method for the extraction of this silica was researched. A low level of
impurity and high reactivity material was produced, which is appropriate for the
synthesis of wolastonite (CaSiO3). High purity wolastonite has many applications in
manufacturing and agriculture. The mineral wolastonite can be formed in nature in
different ways; it is generally accepted two forming processes, both encompassing
limestone metamorphism (heat and pressure). In this work, a new process for the
synthesis of wolastonite from RHA colloidal silica was developed. Moreover, the
process is aimed at lower energy costs, fewer stages and fewer reactants consume. The
first step of the wolastonite synthesis was studied, with the purpose of obtaining
calcium hydrosilicate. Eleven different hydrosilicates occur in the system Ca(OH)2-
SiO2-H2O, in the second step, it was annealed to form the wolastonite phase.
Como referenciar
FERNANDES, A.A.; FRAJNDLICH, E.U.; RIELLA, H.G. Wolastonite synthesis from rice hull ASH. In: INTERNATIONAL LATIN-AMERICAN CONFERENCE ON POWDER TECHNOLOGY, 6th, Nov. 7-10, 2007, Buzios, RJ. Abstract... p. 1216. Disponível em: http://repositorio.ipen.br/handle/123456789/20056. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.