水泥窑用镁铬砖中Cr^(6+)化合物的化学性质和解毒

Chemical property and detoxifcation of hexavalent chromium contained in magnesia chrome brick used in cement kiln

研究了K2CrO4的化学稳定性。K2CrO4中的Cr6+不能或难于被乙醇、乙醛、柠檬酸、酒石酸、葡萄糖甚至草酸还原,仅发现FeSO4与MnSO4可将K2CrO4的Cr6+转化成Cr3+。镁铬残砖产生的Cr6+物质很难在环境中被破坏,很多情况下将长期存在自然界中,持续性地危害人体的健康。因此,水泥窑应优先使用无铬耐火材料,如使用镁铬砖,须用FeSO4或MnSO4等方法将残砖解毒。

The chemical stability of K2CrO4 was studied by chemical analysis. The results show that hexavalent chromium of K2CrO4 can hardly be reduced by ethanol, aldehyde, citric acid, tartaric acid, dextrose and oxalic acid, but the hexavalent chromium can be deoxidized to trivalence chromium by FeSO4 or MnSO4. Therefore the hexavalent chromium from magnesia chrome brick can hardly be destroyed in the nature and will last long. Based on the facts referred to above, cement kiln should use the refractories materials without chromium. If the magnesia chrome bricks were used, the discarded bricks must be detoxified .