Abstract
Production of metal that is of very high purity remains at substantial levels globally. But, the changing palette of raw material quality, pot room design factors, and operating conditions that support production of very high metal purity threaten the status quo. Older cell technologies that are quite capable of very high purity production are less competitive. Some technologies, especially in the arena of pollution control, are not as sustainable as they once were. Since the demand for very high purity is not anticipated to diminish, re-alignments of cast house capacity to include small mold lines may become common once again. In this paper the author reviews the key factors that are required to produce very high purity metal and comments upon their sustainability. Conclusions are focused on possible paths forward and how these may impact primary metal cast houses.
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