Abstract

In the present study, copper (Cu) and iron boride (Fe_xB) were produced for the first time through molten salt electrolysis using chalcopyrite (CuFeS₂) in an oxide-based borax electrolyte. Molten salt electrolysis was carried out at 1073 K and a current density of 600 mA/cm² for 3600 s under galvanostatic conditions. Cu and Fe/Fe_xB were deposited on the graphite crucible surface used as the cathode. The particles obtained as a result of electrolysis were examined by X-ray diffraction (XRD) and determined to contain Cu and Fe/Fe_xB. The location and ratio of Cu and Fe_xB in the particles were investigated by using EDS mapping, energy-dispersive spectroscopy (EDS), and X-ray spectroscopy (XRD); Cu and Fe/Fe_xB were found to be present throughout the particles at different ratios. Cu and Fe/Fe_xB were successfully separated from each other by selective leaching of copper in a 1 M NH₃–H₂O solution. The time-dependent dissolution behavior of Cu was investigated at pH 8, 298 K, 600 rpm stirring rate for 900–5400 s, and it was observed that the dissolution rate increased over time and all the copper had completely dissolved after 5400 s. After leaching particles were examined by XRD and SEM, it was revealed that Fe/Fe_xB particles did not contain any Cu.

Graphical Abstract

中文翻译：

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熔融盐电解生产黄铜矿中Cu和Fe / Fe x B的新方法

摘要

在本研究中，使用黄铜矿（CuFeS ₂）在基于氧化物的硼砂电解质中通过熔融盐电解首次生产了铜（Cu）和硼化铁（Fe _x B）。熔盐电解在恒电流条件下在1073 K和600 mA / cm ²的电流密度下进行3600 s。Cu和Fe / Fe _x B沉积在用作阴极的石墨坩埚表面上。作为电解的结果而获得的粒子用X射线衍射（XRD）检测和确定含有的Cu和Fe / Fe的_X B.铜和铁的位置和比_X使用EDS映射，能量色散光谱（EDS）和X射线光谱（XRD）研究了颗粒中的B；的Cu和Fe / Fe的_X乙被认为是在整个以不同的比例的颗粒存在。通过在1 M NH ₃ -H ₂ O溶液中选择性浸出铜，成功地将Cu和Fe / Fe _x B彼此分离。在pH 8、298 K，600 rpm的搅拌速度下（900-5400 s）研究了铜随时间的溶解行为，观察到溶解速率随时间增加，并且所有铜在5400 s后已完全溶解。通过XRD和SEM检查浸出颗粒后，发现Fe / Fe _x B颗粒不含任何Cu。

图形概要