Functional glass-ceramic foams from 'inorganic gel casting' and sintering of glass/slag mixtures

JOURNAL OF CLEANER PRODUCTION

卷:187

Article

Rincon, Acacio¹  Desideri, Daniele¹  Bernardo, Enrico¹ 

[1] Univ Padua, Dipartimento Ingn Ind, Padua, Italy

关键词: Gel casting;    Alkali activation;    Glass ceramic foams;    Copper slag;    Electromagnetic shielding;   

DOI  :  10.1016/j.jclepro.2018.03.065

来源: Elsevier

【 摘 要 】

The here described investigation was essentially aimed at exploring the chemical stabilization and reutilization of iron-rich slag from copper metallurgy, by the manufacturing of glass-ceramic foams. The foams were developed according to a new method, recently reported for pure recycled soda-lime glass. Mixtures of soda-lime glass/slag powders (with slag content ranging from 10 to 30 wt%), suspended in alkaline aqueous solution, underwent progressive low temperature (80 degrees C) hardening, owing to the formation of hydrated calcium silicate compounds (C-S-H). Before complete setting, an extensive foaming could be achieved by vigorous mechanical stirring, with the help of a surfactant. After foaming, glass/slag mixtures could be sintered at 800-1000 degrees C; the mutual interaction caused an extensive crystallization, with precipitation of Ca-Fe silicates and iron oxides (hematite and magnetite), promoting the mechanical properties (up to 4.4 MPa, with a porosity of about 80%). Leaching test confirmed the stabilization of pollutants, from the slag, in the final ceramics. Owing to the separation of iron oxides, particularly magnetite, the newly obtained foams exhibited a ferrimagnetic behavior, that could be exploited in electromagnetic shielding applications. (C) 2018 The Authors. Published by Elsevier Ltd.

【 授权许可】

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