Preparation of slag glass ceramic from electric arc furnace slag, quartz sand and talc under various MgO/Al₂O₃ratios

Abstract

Electric arc furnace slag, quartz sand and talc were combined to prepare slag glass ceramic. The crystallisation behaviour, microstructure, main mechanical properties and chromium solidification performance of glass ceramics were investigated as a function of MgO/Al 2 O 3 ratio through differential thermal analysis, X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy and mechanical testing. FactSage software was introduced to calculate the batch viscosity. It is established that there is a mutual suppression agreement between MgO and Al 2 O 3 . As for the chromium solidification performance, the result of acid leachability was almost consistent with the variation of mechanical properties. The alkaline leachability was near to zero. In all the investigated glass ceramics, samples with 1:1 and 1:2 MgO/Al 2 O 3 ratio values demonstrate excellent mechanical properties and fixing capacity for chromium.

Use of Arc Furnace Slag and Ceramic Sludge for the Production of Lightweight and Highly Porous Ceramic Materials

“…AFS is created after melting and preliminary acid refining of liquid steel. It is a rocky and non-rugged material that can be crushed for use as aggregate in concrete batches [ 13 , 14 , 15 ].…”

Preparation of Steel Slag Ceramics with Different MgO/Al2O3 Ratios

“…In order to obtain supplementary information on the phase transformation, FTIR spectra of the samples were measured in the range of 400 cm −1 to 2500 cm −1 at room temperature, as shown in Figure 3. The peaks at around 1070 cm −1 and 965 cm −1 are due to the asymmetric stretching vibration of Si-O − (O − : non-bridging oxygen) bands in O 3 and Q 2 (O n : the N bridging oxygen bond in the tetrahedral structure) tetrahedral units of the augite or diopside phase [29]. The peak at around 630 cm −1 is attributed to the symmetric stretching vibration of Si-O bands in Q 0 tetrahedral units of the augite or diopside phase.…”

“…The peak at around 457 cm −1 is associated with the stretching vibration modes of the Si-O-Si bond and O-Mg-O of the diopside phase [32]. The peak at 567 cm −1 in the spectra of samples M4, M5, and M6 appears due to the decrease in the MgO/Al2O3 ratio, leading The peaks at around 1070 cm −1 and 965 cm −1 are due to the asymmetric stretching vibration of Si-O − (O − : non-bridging oxygen) bands in O 3 and Q 2 (O n : the N bridging oxygen bond in the tetrahedral structure) tetrahedral units of the augite or diopside phase [29]. The peak at around 630 cm −1 is attributed to the symmetric stretching vibration of Si-O bands in Q 0 tetrahedral units of the augite or diopside phase.…”

Study of optical constants and dielectric properties of nanocrystalline α-cordierite ceramic

“…The nanocrystalline α-cordierite has the highest melting points among glass ceramics (about 1460°C) and has three polymorphous forms: α-cordierite stable in high temperature with hexagonal structure, βcordierite stable in low temperature with orthorhombic structure, and µ-cordierite that it is a metastable form [3,4].…”