直岛冶炼厂三菱炼铜法中磁性氧化铁行为的控制

研究了三菱连续铜熔炼和吹炼工艺中所产生炉渣的微观组织与相图，以防止磁性氧化铁引发的一系列问题，诸如炉膛与流槽上的炉结积聚，熔体出口堵塞，渣粘度上升等等。根据这些研究结果．通过调整熔炼炉的硅酸盐渣中的二氧化硅和氧化钙含量以及吹炼炉的铁钙渣中的氧化钙含量。以达到降低、稳定弃渣含铜量。减少熔体出口及流槽的清理之目的。然而，这些改动有可能降低希望的炉结保护层厚度，从而缩短炉寿命。因此，开发了一种估测熔体内磁性氧化铁含量的方法，井将炉渣成分与温度控制在适当范围内，从而延长炉寿命，避免磁性氧化铁引发的问题。

Control of magnetite behavior in the Mitsubishi process at Naoshima

The phase diagrams and microstructures of the slags in the Mitsubishi Continuous Copper Smelting and Converting Process were studied for the prevention of the magnetite troubles such as accretion build-up on furnace hearths and launders, blockages at the melt outlet, slag viscosity increases and so on. According to the results of those studies, the silica and lime contents in the silicate slag at the smelting furnace, and the lime content in the lime-ferrite slag at the converting furnace were changes, resulting in lower and more consistent copper levels in the discard slag, with much less need for operators to clean melt outlets and launders. However, these changes may decrease the desirable amount of accretion-coating inside the furnaces and thereby reduce furnace campaign lives. Therefore, a method of estimating the magnetite level in the melts was developed, and slag compositions and temperatures have been controlled within the appropriate ranges to prolong furnace lives and also prevent magnetite troubles.