Liu Mengke, Ma Guojun, Zhang Xiang, Liu Junjie, Wang Qiang
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China.
Materials (Basel). 2020 Feb 8;13(3):776. doi: 10.3390/ma13030776.
Copper slag and stainless steel slag of Electric Arc Furnace (EAF) are two typical metallurgical solid wastes, which contain a large number of valuables, such as Fe, Cr, and Cu. The transition metal elements in the waste slags, such as Cr and Fe, can be recycled as the coloring ions in the black ceramic tile. In this study, the Fe/Cr molar ratio in the raw materials of copper slag and stainless steel slag was adjusted, and the black ceramic tile was subsequently prepared by sintering. The results show that the optimum process parameters for the preparation of black ceramic tiles are the Fe/Cr molar ratio of 2.0, the sintering temperature of 1150 °C, and the sintering time of 30 min. The compressive strength of the black ceramic tile at optimum sintering conditions exceeds the minimum compressive strength of the Chinese national standard for standard polished tiles, and the concentrations of harmful elements, for example, Cr, Cu, Ni, As, Zn, Pb, and Cr(VI) are within the regulation thresholds specified by the Chinese national standard.
电弧炉（EAF）的铜渣和不锈钢渣是两种典型的冶金固体废弃物，它们含有大量有价元素，如铁、铬和铜。废渣中的过渡金属元素，如铬和铁，可以作为黑色瓷砖中的着色离子进行回收利用。在本研究中，调整了铜渣和不锈钢渣原料中的铁/铬摩尔比，随后通过烧结制备了黑色瓷砖。结果表明，制备黑色瓷砖的最佳工艺参数为铁/铬摩尔比为2.0、烧结温度为1150℃、烧结时间为30分钟。在最佳烧结条件下，黑色瓷砖的抗压强度超过了中国国家标准中标准抛光砖的最小抗压强度，并且有害元素（如铬、铜、镍、砷、锌、铅和六价铬）的浓度在国家标准规定的限值范围内。
