Reaction Sintered Porous Ceramics Using Iron Tailings: Preparation and Properties

Abstract

To expand the utilization of iron tailings, four kinds of porous ceramics were prepared by foam gel-castingpressureless sintering, foam gel-casting-reactive sintering, and mold forming-reactive sintering using fine-grained highsilicon iron tailings, iron tailings + graphite, and iron tailings + graphite + silicon carbide as the raw materials, respectively. DSC-TG and XRD analysis was applied to investigate the sintering process of iron tailings and the carbothermalreduction reaction between iron tailings and graphite. The four porous ceramics' porosity, compressive strength, and thermal conductivity were further analyzed. The results show that the porous ceramics made only from iron tailings possesses high porosity (87.2%), compressive strength (1.37 MPa), and low thermal conductivity (0.036 W/(m• K)), meeting the requirement of thermal insulation material. Silicon carbide porous ceramics with improved thermal conduc-

Mechanical Properties and Hydration Mechanism of Iron Tailings–Cement-Based Supplementary Cementitious Materials

“…Figure 2 displays the X-ray diffraction patterns of the raw materials. The SiO 2 in the IOTs exists as an α-quartz phase, which is a very stable crystal and has a hardness of up to 7 [50,51]. This corresponds to two typical characteristics of IOTs: low reactivity and difficult to grind.…”