Mechanism and control of scorodite formation for arsenic stabilization

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Copper is one of important base metals. On the other hand, the concentrations of impurities in ores are increasing due to the decrease in the natural resources. In particular, arsenic becomes the problem. The technology to immobilize the arsenic after separation is required to store the arsenic safely and economically. The purpose of this study was to elucidate the formation mechanism of the scorodite which was an stable arsenic compound. It was made clear that, depending on conditions, amorphous ferric arsenate was once formed on a seed crystal in water solutions but crystallized with progress of the retention time. It was also found that crystallization of the amorphous into scorodite occurs even in gas atmospheres.