Abstract: Chromite ore processing residue （COPR） is a hazardous solid waste which has brought heavy pollution to the environment. Hydro-based detoxication is an efficient method for COPR disposal and treatment，but there are also many difficulties for large-scale applications.In recent years，great progress has been made in the research for mineralogical phase of COPR.Properties of chromium and the production course of COPR were summarized and research achievements on mineralogical phase were introduced.Furthermore，the mineral characteristics of COPR have been reviewed and their potential meaning in the hydro-based detoxication was also discussed.Problems existed in hydro-based COPR detoxication were analyzed and corresponding solving methods were put forward.

Key words: chromite ore processing residue, mineral composition, hydro-based detoxication, chromium pollution