Abstract
Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr(VI)). Although the high temperature chromite process was banned in several countries, its legacy still exists at numerous contaminated sites. For instance, New Jersey alone has over 2 million tons of waste COPR. Legacy sites are confounded by the fact that a few countries still produce COPR during chromate extraction that leads to new contamination. This paper reviews the historical production and disposal practices of COPR and provides a concise overview of the different methods for addressing Cr(VI) contamination at old and new COPR sites.
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