Preparation of Monoclinic Pyrrhotite by Thermal Decomposition of Jarosite Residues and Its Heavy Metal Removal Performance
Preparation of Monoclinic Pyrrhotite by Thermal Decomposition of Jarosite Residues and Its Heavy Metal Removal Performance
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黄钾铁矾残渣热分解制备单斜磁黄铁矿及其重金属去除性能
DOI：
10.3390/min11030267
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发表时间：
2021-03
期刊：
影响因子：
2.5
通讯作者：
Peng Shuchuan
中科院分区：
文献类型：
--
作者：
Xu Cuimin;Xie Qiaoqin;Xu Fan;Zhou Yuefei;Wang Hanlin;Chen Tianhu;Peng Shuchuan
湿法炼锌产生的黄钾铁矾渣是一种危险固体废物。本研究以黄钾铁矾渣为原料，在硫化氢气氛中热解制备了单斜磁黄铁矿(M-Po)。考察了气速、反应温度、反应时间等因素对反应的影响。分别用X射线衍射仪、扫描电子显微镜和X射线光电子能谱分析了热解前后固体的物相、微观结构和元素价态。考察了制备的M-Po对水溶液中锌、铅的去除性能。结果表明，在550~575℃的反应温度下，M-Po是唯一的产物，大部分M-Po粒子为纳米级，呈异形形态。热解过程的物相演化过程为黄钾铁矾石→赤铁矿/磁铁矿→黄铁矿→黄铁矿+M-Po→M-Po+六方磁黄铁矿(H-Po)→H-Po。M-Po的形成速度、结晶度和表面微结构受反应温度和时间的控制。不完全硫化可产生具有核壳(核为氧化物，壳为硫化物)和三层(核为硫酸盐，夹层为氧化物，壳为硫化物)结构的粗大颗粒。在575℃下制得的M-Po具有良好的去除重金属的能力，在25℃，pH为5~6的条件下，对锌的吸附容量为25 mg/g，对铅的吸附容量为100 mg/g。研究表明，高温硫化法是一种处理和利用黄钾铁矾渣的新方法。
Jarosite residues produced by zinc hydrometallurgical processing are hazardous solid wastes. In this study, monoclinic pyrrhotite (M-Po) was prepared by the pyrolysis of jarosite residues in H2S atmosphere. The influence of gas speed, reaction temperature, and time was considered. The mineral phase, microstructure, and elemental valence of the solids before and after pyrolysis were analyzed using X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, respectively. The performances of the prepared M-Po on the removal of Zn and Pb from aqueous solution were evaluated. The results show M-Po to be the sole product at the reaction temperatures of 550 to 575 °C. Most of the M-Po particles are at the nanometer scale and display xenomorphic morphology. The phase evolution process during pyrolysis is suggested as jarosite → hematite/magnetite → pyrite → pyrite+M-Po → M-Po+hexagonal pyrrhotite (H-Po) → H-Po. The formation rate, crystallinity, and surface microtexture of M-Po are controlled by reaction temperature and time. Incomplete sulfidation may produce coarse particles with core–shell (where the core is oxide and the shell is sulfide) and triple-layer (where the core is sulfate, the interlayer is oxide, and the shell is sulfide) structures. M-Po produced at 575 °C exhibits an excellent heavy metal removal ability, which has adsorption capacities of 25 mg/g for Zn and 100 mg/g for Pb at 25 °C and pH ranges from 5 to 6. This study indicates that high-temperature sulfidation is a novel and efficient method for the treatment and utilization of jarosite residues.
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