The influence of temperature and SiC content on the recycling of iron ore tailings for the preparation of value-added fo
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ORIGINAL ARTICLE
The influence of temperature and SiC content on the recycling of iron ore tailings for the preparation of value‑added foam ceramics Lin Li1 · Tao Jiang1 · Mi Zhou1 · Bojian Chen1 · Chao Chen1,2 Received: 28 June 2020 / Accepted: 23 October 2020 © Springer Japan KK, part of Springer Nature 2020
Abstract Iron ore tailings (IOT) are common wastes in industrial iron processes, which are harmful to the environmental and industrial development. Therefore, developing an efficient process for the recycling and utilization of IOT is of extreme importance. In this work, the influences of the sintering temperature and SiC content on the material properties of foam ceramics developed from IOT were investigated. More specifically, bulk density, water absorption, and microstructure of the materials were discussed. In addition, the foaming mechanism was analyzed. The experimental results showed that the average pore size of the material gradually increased and the bulk density decreased with increasing sintering temperature. On the other hand, the bulk density of the samples decreased and the water absorption increased with increasing SiC content. An optimal lightweight foam ceramic was fabricated from 55 wt.% IOT and 0.10 wt.% SiC at 1130 °C. Finally, foam ceramics as construction materials were produced with excellent material performance, including a bulk density of 0.77 g/cm3 and a uniform pore size distribution. This study describes a cleaner technology for the value-added utilization of IOT. Graphic Abstract
Keywords Foam ceramics · Iron ore tailings · Sintering temperature · SiC · Waste management
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Journal of Material Cycles and Waste Management
Introduction Iron ore is widely exploited and smelted in Asia because of its importance as a mineral resource [1, 2]. However, while obtaining high economic benefits, tailings stockpiling has always been a major problem that mining companies need to contemplate in their industrial activity. In China, approximately 570 million t of iron ore tailings (IOT) are produced in the Panzhihua area, but the comprehensive utilization rate of tailings is only 11.3% [3–6]. Therefore, tailings are piled up in local, overloaded ponds, which causes a series of environmental problems such as land degradation, groundwater pollution, and generation of dust [7]. Consequently, it is urgent to find an efficient recycling technology to reduce the amount of this industrial solid waste, eventually establishing an integrated waste management process. The main chemical composition of IOT is similar to that of traditional ceramic powders. The S iO2 and A l2O3 available in the tailings can be used to replace ceramic powders, in part or in whole, for the preparation of ceramic materials. In recent years, the development of foam ceramics using different solid wastes as raw materials has been gaining increasing attention [8]. Moreover, the performance of foam ceramics is much higher than tha
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