Crystallization Behavior of Copper Smelter Slag During Molten Oxidation
Crystallization Behavior of Copper Smelter Slag During Molten Oxidation
复制标题
DOI：
10.1007/s11663-015-0365-3
复制
发表时间：
2015-10-01
影响因子：
3
通讯作者：
Nakamura, Takashi
中科院分区：
文献类型：
--
作者：
Fan, Yong;Shibata, Etsuro;Nakamura, Takashi
铜渣由冶炼铜精矿得到的硅酸铁和硅熔剂组成。利用这种二次资源的最重要标准之一是从炉渣基质中回收铁以减少倾倒炉渣的量。采用破碎磁力分离的熔融氧化工艺似乎是一种更可持续的方法，并且基于在铜冶炼工艺后将氧化气体直接吹到熔渣上。在当前的研究中，使用红外炉研究了熔融氧化过程中炉渣的结晶行为，以更好地了解磁铁矿和赤铁矿沉淀之间的权衡，并通过 X 射线衍射（使用内标）进行评估。此外，使用激光显微镜和拉曼成像系统检查晶体形态，以了解氧化铁的转变，并通过扫描电子显微镜和能量色散光谱补充 Cu、Zn、As、Cr 和 Pb 等杂质的分布。此外，还研究了反应机理，重点关注氧化过程。
Copper slag is composed of iron silicate obtained by smelting copper concentrate and silica flux. One of the most important criteria for the utilization of this secondary resource is the recovery of iron from the slag matrix to decrease the volume of dumped slag. The molten oxidation process with crushing magnetic separation appears to be a more sustainable approach and is based on directly blowing oxidizing gas onto molten slag after the copper smelting process. In the current study, using an infrared furnace, the crystallization behavior of the slag during molten oxidation was studied to better understand the trade-off between magnetite and hematite precipitations, as assessed by X-ray diffraction (using an internal standard). Furthermore, the crystal morphology was examined using a laser microscope and Raman imaging system to understand the iron oxide transformation, and the distribution of impurities such as Cu, Zn, As, Cr, and Pb were complemented with scanning electron microscopy and energy dispersive spectroscopy. In addition, the reaction mechanism was investigated with a focus on the oxidation processes.