Innovative methodology for the utilization of low-grade pyrite cinder containing heavy metals via hydrothermal alkali melting followed by chlorination roasting
Innovative methodology for the utilization of low-grade pyrite cinder containing heavy metals via hydrothermal alkali melting followed by chlorination roasting
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水热碱熔氯化焙烧利用含重金属低品位黄铁矿渣的创新方法
DOI：
10.1016/j.jallcom.2020.155722
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发表时间：
2020-11
影响因子：
6.2
通讯作者：
Shuming Wen
中科院分区：
文献类型：
--
作者：
Shaojun Bai;Yunxiao Bi;Zhan Ding;Chunlong Li;Pan Yu;Shuming Wen
低品位硫铁矿石是硫酸生产过程中产生的典型工业固体废弃物，是一种重要的潜在铁资源。本研究探讨了含重金属的LPyC通过水热碱熔融和氯化焙烧的利用。结果表明，在200 °C、30wt%NaOH、液固比为2：1的条件下，水热碱熔对SiO2、Al2O3和硫的溶解具有明显的选择性。氯化焙烧结果表明，在最佳条件下（焙烧温度1100 °C，焙烧时间90 min，MgCl2用量4%），可以实现重金属与铁的分离。重金属的挥发效率（EV）为：EVPb>EVZn>EVCu。经过整个流程后，仅含49.34% Fe的LPyC被纯化至约60.12%，具有可接受的低水平的重金属杂质（0.05%铜、0.07%铅和0.11%锌），并且精矿的Fe回收率达到89.65%。为了揭示该工艺的机理，采用X射线衍射、扫描电镜和能谱分析以及热模拟等手段对该工艺的相变、微观结构和热力学基础进行了研究。
Low-grade pyrite cinder (LPyC) is a typical industrial solid waste from sulfuric acid production and is considered an important potential iron resource. This study investigated the utilization of LPyC containing heavy metals through hydrothermal alkali melting followed by chlorination roasting. Results indicated that the hydrothermal alkali melting showed a significant selectivity for the dissolution of silica, alumina and sulfur under optimum conditions (melting at 200 °C for 90 min, 30 wt% NaOH, and a liquid-to-solid ratio of 2:1). Chlorination roasting results indicated that the separation of heavy metals from iron can be realized under optimum conditions (roasting at 1100 °C for 90 min and 4% MgCl2). Moreover, the efficiency of volatilization (EV) of the heavy metals was found in following sequence: EVPb>EVZn>EVCu. After undergoing the entire process, the LPyC containing only 49.34% Fe was purified to about 60.12% with an acceptably low level of heavy metal impurities (0.05% copper, 0.07% lead and 0.11% zinc), and the Fe recovery of concentrate reached 89.65%. To reveal the mechanism of present process, the phase transformation, microstructure and basic thermodynamic evaluation of the process were researched by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy and HSC, respectively.
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