The invention belongs to the technical field of
chromium residue detoxifying, and discloses a
chromium residue detoxifying process. The process comprises the following steps of: performing
wet grinding on
chromium residue, adding water into the chromium residue to prepare chromium residue
slurry; and after being subjected to acid-leaching reduction reaction, performing
solid-liquid separation on the chromium residue
slurry to obtain a
filter cake, namely the detoxified chromium residue. The process is characterized in that: under the condition of not changing the original alkaline environment of the chromium residue, a
reducing agent 1 is added into the chromium residue directly, and then the
reducing agent and the chromium residue are subjected to
wet grinding to form particles with 100 to 300 meshes; and the water is added to prepare the chromium residue
slurry with 30 to 45 baume degrees, wherein the
reducing agent 1 is
sodium sulphide,
sodium bisulfide,
sodium thiosulfate or sodium pyrosulfite. The process has simpleness, thorough detoxification, no chromium return phenomenon and easy implementation of
mass production; and the process prolongs effective reduction reaction time, improves reaction efficiency, saves the using amount of acid during the acid-leaching reduction, and has low
processing cost because Cr6+ in the chromium residue is subjected to two times of
dissolution and reduction.