The amount of copper flash smelting slag has increased during the recent years along with an increasing slag-to-metal ratio. During slag tapping, some copper sulfide is mechanically entrained. As a result, it is necessary to recover copper matte from the slag by suitable methods. At present, the most common way is slow, controlled cooling in a transfer ladle. However, research on the detailed effects of slow cooling and the function of slag modification is rare. This paper described experiments that were performed at different cooling rates (0.5, 1.5, 3, and 7 °C/min), with and without additive. A detailed characterization of the copper-rich phase and its particle size was subsequently made using SEM-EDS micrographs and image analysis software. With a decrease in cooling rate, the particle size of the copper-rich matte phase became larger. The addition of gypsum and carbon as a slag modifier affected the size of the copper-rich phase slightly, and its chemical composition was modified compared with the experiments without additive.

中文翻译：

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冷却速度和炉渣改性对冶炼渣中锍铜的影响

近年来，随着熔渣与金属比的增加，铜闪速熔炼渣的量有所增加。在出渣过程中，一些硫化铜被机械夹带。因此，有必要通过合适的方法从炉渣中回收锍铜。目前，最常见的方法是在转移钢包中缓慢受控冷却。然而，关于缓冷的详细效果和炉渣改性作用的研究很少。本文描述了在不同冷却速率（0.5、1.5、3 和 7 °C/min）下进行的实验，使用和不使用添加剂。随后使用 SEM-EDS 显微照片和图像分析软件对富铜相及其粒度进行了详细表征。随着冷却速度的降低，富铜锍相的粒径变大。