黄磷尾气解毒铬渣

Detoxification of chromium residue by yellow phosphorus tail gas

研究了黄磷尾气解毒铬渣。实验方法及工艺条件:将六价铬(铬酸钠)质量分数为1%的铬渣粉碎至粒度小于75μm,取5 g样品加入石英管中,加热到600℃,反应20 min,然后在黄磷尾气气氛中冷却至200℃以下。实验结果表明,在上述条件下可以将铬渣中六价铬质量分数降至0.3 mg/kg,并且铬渣不会返黄。

The detoxification of chromium residue using yellow phosphorus tail gas was researched. Experimental approach and process conditions： chromium residue, which contained 1% Cr （VI）[w （Na2CrO4）], was crashed to 75/xm below.Then, 5 g sample was took into quartz tube,reaction occurred in 600 ℃ for 20 min,and reactants was protected in yellow phosphorus tail gas till to cool below 200 ℃.Experiment results showed that, Cr（Ⅵ） in chromium residue could be reduced to 0.3 mg/kg, and had none brightness reversion phenomenon.