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Electrostatic Filter Ash from Silane Production as Silicate Substitute in Zeolite Chemistry |
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| Authors: | Andrea Hartmann Valeriy Petrov Josef‐Christian Buhl Katrin Rübner Matthias Lindemann |
| Affiliation: | 1. Institute of Mineralogy, Leibniz University Hannover, Callinstr. 330167, Hannover, Germany;2. Division Technology of Construction Materials, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 8, 712205 Berlin, Germany |
| Abstract: | This paper is a case study of complete substitution of sodium‐metasilicate in zeolite Na‐A synthesis by an electrostatic filter ash (FA) arising in high amounts during silane waste incineration process. The silicate abundant FA is a suitable material for reinsertion in zeolite chemistry. This is shown in the presented investigation by the development of a model reaction process at low temperatures (50–60 °C) and short times (1.5–4 h). The experiments were performed under addition of NaAlO2 and variation of the alkalinity and the reaction period. Characterization and fine tuning of the process was mainly done by studying the kinetics of FA digestion and zeolite crystallization by XRD and chemical analyses (ICP‐OES) of solutions and solids. It could be shown that pure FA was mostly dissolved (98 %) in 8 M NaOH already after 1 h. Addition of NaAlO2 and crystallization for further 60 min under optimized conditions at 50 °C yielded to a suitable product. It consists of zeolite Na‐A (92 % by mass) beside some hydrosodalite (8 % by mass). According to this low temperature short time process this study is a contribution for the development of energy efficient recycling solutions. |
| Keywords: | Electrostatic filter ash (FA) Sodium‐metasilicate Zeolites Silanes |
