高铁酸盐由氢氧化铁残渣再制备及其用于水体脱色的研究

将制备高铁酸盐后所留的氢氧化铁残渣制成六氟合铁酸钾再与次氯酸钠的高碱度溶液反应，第二次生成高铁酸盐溶液。随后用制得的含氟的高铁酸盐溶液处理甲基橙有色配水，其最佳pH在7．0左右，质量浓度为20mg／L的甲基橙的水样500mL，耗用17mg的高铁酸钾，脱色率可达95％以上，处理后的水体中氟离子残留量低于国家排放标准。制得的含氟的高铁酸盐溶液作为脱色的水处理剂不会引起二次污染，工艺可行，效果良好。

The preparation of ferrate from dregs of ferric hydroxide and its application for decolorizing colored water

The dregs of ferric hydroxide in the preparation of ferrate was to be converted into potassium fluoferrite first, then the potassium fluoferrite was put into the high - alkali solution of sodium hypochlorite and ferrate was generated again. The colored water containing methyl orange was treated with the ferrate solution containing fluorine. The best pH value was about 7.0 in treated water,and 500 mL colored water containing 20 mg/L methyl orange could be treated well with 17 mg potassium ferrate. The results showed that not only the decolorizing efficiencies were above 95%, but also the residual quantity of fluorine ion in the treated water meeted the national effluent standards. The ferrate containing fluorine made by this process used as decoloring agent has no secondary pollution. The process is feasible and efficient.