在对铬铁矿无钙焙烧渣的组成进行系统分析表征的基础上，提出了在酸性条件下，利用铬渣中未反应的铬铁矿（Fe，Mg）（Cr，Fe）2O4中的二价铁与重铬酸根离子发生氧化还原反应，实现铬渣自身解毒的新方法。研究表明：机械球磨对于铬渣酸浸解毒过程是一个主要的影响因素，对应的铬渣粒度为6~16.5 μm，铬渣酸浸解毒的较好工艺条件为：硫酸质量分数为5%，液固比为4 mL/g，反应温度为80 ℃，反应时间为60 min。解毒后铬渣中六价铬质量分数能降至2.5×10-5以下。

A new detoxification process of chromite ore processing residue（COPR），which utilized the residual chromite ore（Fe，Mg）（Cr，Fe）2O4 in COPR to react with the Cr2O72- in it in an acid environment was proposed on the basis of the systematic analysis and characterization of the composition of COPR.The results indicated that the mechanical grinding played an important role in the new detoxification process of COPR，and the corresponding particle size was at 6~16.5 μm.The optimized detoxification conditions were as follows：the mass fraction of sulphuric acid was 5%，the liquid?鄄to?鄄solid ratio was 4 mL/g，the reaction temperature was 80 ℃ and the reaction time was 60 min. Under the conditions，the mass fraction of the Cr（Ⅵ） in COPR could be reduced to less than 2.5×10-5 after detoxification.