摘要
提出了硫酸浸出—浸出渣水合肼还原的铬渣解毒工艺,考察了相关因素对铬渣中六价铬去除率的影响,确定了铬渣解毒优化条件。试验结果表明:在80℃下用硫酸浸出铬渣,控制液固体积质量比8∶1,浸出终点pH为8.0左右,浸出时间120min,铬渣中的六价铬浸出率为76%;然后用水合肼还原浸出渣中剩余的六价铬,水合肼加入量为浸出渣质量的0.06%,最终渣中水溶性六价铬质量分数降至5mg/kg以下,达到排放要求。
The process of sulfuric acid leaching-hydrazine hydrate reduction for chromium residue detoxicating was studied.The effects of related factors on removal of hexavalent chromium were examined,and the optimum conditions were determined.The results show that the optimal conditions are ratio of liquid volume-to solid mass of 8∶1,pH about 8.0,temperature of 80 ℃ and leaching time of 120 min.Under the optimal conditions,the leaching of hexavalent chromium is about 76%.The residual hexavalent chromium in the leaching residue can be reduced using hydrazine hydrate（0.06%quantity to leached residue）,then the water-soluble hexavalent chromium in the leached residue can be lower than 5mg/kg which meets the discharged standard.
出处
《湿法冶金》
CAS
北大核心
2017年第5期380-383,共4页
Hydrometallurgy of China
关键词
铬渣
六价铬
硫酸
水合肼
chromium residue
hexavalent chromium
sulfuric acid
hydrazine hydrate
