Department of Metallurgical and Materials Engineering, Fırat University, 23119, Elazig, Turkey.
Environ Sci Pollut Res Int. 2021 Oct;28(39):54811-54825. doi: 10.1007/s11356-021-14399-z. Epub 2021 May 20.
This study, which covered a set of leaching processes at a few stages, investigated the inclusion of iron found in mill scale, which is a waste of the iron-steel industry, in the solution as FeCl in the presence of HCl and the conditions of using this solution with an oxidizing character in extraction of metals from chalcopyrite concentrate. Mill scale was treated with HCl, and an FeCl solution was obtained at a 100% Fe solubility and 83.43% Fe conversion rate in the conditions of 60 min, 105 °C, 7 M HCl, and 1/10 solid-liquid ratio. This solution that was obtained was later used in copper extraction from a chalcopyrite concentrate. In the optimum conditions (120 min of leaching time, 105 °C of leaching temperature, 1/25 solid-liquid ratio, 400 rpm stirring speed), 95.04% of the copper was taken into the solution. In the leaching experiment in a medium containing mill scale + chalcopyrite and HCl at the same time, under the optimum conditions (120 min of leaching time, 105 °C of leaching temperature, 7 M HCl concentration, 1 g chalcopyrite concentrate, 1/25 solid-liquid ratio, 5 g mill scale, 400 rpm stirring speed), approximately 96% of copper was taken into the solution.
本研究涵盖了一系列在几个阶段进行的浸出过程，研究了包含在轧钢厂废料中的铁（即钢铁工业的废物）在 HCl 存在下作为 FeCl 溶解的情况，以及在存在氧化性质的情况下使用这种溶液从黄铜矿精矿中提取金属的条件。在 60 分钟、105°C、7M HCl 和固液比为 1/10 的条件下，用 HCl 处理轧钢厂废料，获得了一种 100%Fe 溶解度和 83.43%Fe 转化率的 FeCl 溶液。随后，该溶液用于从黄铜矿精矿中提取铜。在最佳条件下（浸出时间 120 分钟、浸出温度 105°C、固液比 1/25、搅拌速度 400rpm），95.04%的铜进入溶液。在同时含有轧钢厂废料+黄铜矿和 HCl 的浸出实验中，在最佳条件下（浸出时间 120 分钟、浸出温度 105°C、HCl 浓度 7M、1g 黄铜矿精矿、固液比 1/25、5g 轧钢厂废料、搅拌速度 400rpm），约 96%的铜进入溶液。
