Synthesis and properties of ferrimagnetic glass‐ceramics and glass fibers derived from pyrite slag

Abstract

Ferrimagnetic nano‐crystal glass‐ceramics and glass fibers were prepared based on the ferrosilicate glass system of SiO2–Fe2O3–B2O3–Al2O3 using large amount of pyrite slag (PS) and small quantities of pure chemicals. Two different fabrication methods were employed, eg, annealing and fiber‐drawing method, without performing any nucleation and crystallization heat treatments. The influence of PS content on the magnetite spontaneous crystallization is investigated by the X‐ray diffraction, FTIR, SEM, and TEM. The X‐ray diffraction patterns show the presence of nanometric magnetite crystals in glass matrix. The ferrimagnetic glass fibers with a diameter of about 20 μm were one‐step drawn. The magnetic hysteresis loops of the glass‐ceramic and glass fiber samples were analyzed using a vibrating sample magnetometer (VSM). Electromagnetic parameters of samples were also examined.

Preparation and properties of ferrimagnetic glass–ceramic foams based on pyrite slag

“…23 Pyrite slag (PS) is a major waste containing ferric oxide generated in sulfuric acid industry and can be used as a main raw material to prepare ferrimagnetic glass-ceramics. 24 The present study provides a new way to employ the PS to fabricate ferrimagnetic glass-ceramic foam (FGCF), which is significant for recycling and utilizing waste. At the same time, FGCF fabricated has magnetism and can be used as microwave absorbing functional materials.…”

“…Magnetite (Fe 3 O 4 ) was being thoroughly investigated as microwave absorbing materials due to its exceptional dielectric and magnetic properties 23 . Pyrite slag (PS) is a major waste containing ferric oxide generated in sulfuric acid industry and can be used as a main raw material to prepare ferrimagnetic glass–ceramics 24 …”