School of Metallurgy and Environment, National Engineering Laboratory of Efficient Utilization of Refractory Nonferrous Metal Resources, Central South University, Changsha, 410083, PR China.
School of Metallurgy and Environment, National Engineering Laboratory of Efficient Utilization of Refractory Nonferrous Metal Resources, Central South University, Changsha, 410083, PR China.
Chemosphere. 2022 Nov;307(Pt 3):136064. doi: 10.1016/j.chemosphere.2022.136064. Epub 2022 Aug 15.
As a hazardous solid waste rich in carbon and fluorine, spent pot lining (SPL) is a huge threat to sustainable production and environmental security. As abundant carbon and fluorine resources, the use of such valuable components has great practical and economic significance. Based on the environmental concerns and the component characteristics of SPL, coal gangue (CG), the largest output of solid wastes in the coal-producing industry and rich in aluminum and silicon, was introduced in the utilization and detoxification process of SPL in this work. The substance flow of the co-utilization process presents a circular economy and complementary advantages of SPL and CG. Pure regular fibrous silicon carbides were obtained owing to the synergy effect of SPL and CG. Aluminum from CG and SPL was utilized to prepare dawsonite combined with the sodium from the impurities removal process. Pure cryolite was obtained via mixing wastewater from the silicon carbide purification process and the dawsonite extraction process. Almost all components in SPL and CG were converted into valuable products, and no wastewater and residue was discharged. Thus, a sustainable process of trash to treasure and circular economy for treating CG and SPL was established here with environmental and economically friendly characteristics, which gave a new insight into utilizing wastes with complementary advantages.
作为一种富含碳和氟的危险固体废物，废旧炉衬（SPL）对可持续生产和环境安全构成了巨大威胁。作为丰富的碳和氟资源，利用这些有价值的成分具有重要的实际和经济意义。基于 SPL 的环境问题和成分特性，在这项工作中，引入了煤矿行业产量最大的固体废弃物——煤矸石（CG），其富含铝和硅，用于 SPL 的利用和解毒过程。该共利用过程的物质流呈现出 SPL 和 CG 的循环经济和互补优势。由于 SPL 和 CG 的协同作用，获得了纯规则纤维碳化硅。利用 CG 和 SPL 中的铝，结合杂质去除过程中的钠，制备了水合碳硅酸钠。通过混合碳化硅提纯过程和水合碳硅酸钠提取过程的废水，得到了纯冰晶石。SPL 和 CG 中的几乎所有成分都转化为有价值的产品，没有废水和残渣排放。因此，建立了一种以环境友好和经济友好为特点的可持续的从垃圾到宝藏和循环经济处理 CG 和 SPL 的工艺，为利用具有互补优势的废物提供了新的思路。
