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.
Keywords: COPR, Cr(VI), chromate, ettringite, remediation.
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