氧化还原法处理含铬废水的有关理论计算

Theoretical Calculation on Treatment of Waste Liquid Containing Chromium by Oxidation-Reduction Method

根据化学平衡理论 ,对六价铬和三价铬在水中的氧化还原反应和沉淀反应进行分析 ,借助于计算机进行计算 ,获得了计算图表 ,为含铬废水的处理提供了理论依据和简单的定量计算方法。通过图表计算可知 ,在还原六价铬时 ,pH值应在 3 5～ 4之间 ,铁铬比应在 8～ 9之间 ;而在沉淀三价铬离子时pH值应在 6

Analysis of Oxidation-Reduction reaction and precipitation reaction of chromic ion(Ⅲ and Ⅵ) in aqueous solution was discussed according to chemical equilibrium theory. Calculation charts were acquired with the help of computer. It supplied theoretical base and simple quantitative method for the treatment of waste liquid containing chromiun. Caculation according to tables and graphs showed that pH value should be 3.5～4 to reduct Cr(Ⅵ) while the ratio of Fe/Cr should be 8～9. pH value should be about 6.7 to precipate Cr(Ⅲ) ion.