改性前后碱性高炉矿渣净化酸性废水的对比研究

为研究碱性高炉矿渣对模拟酸性水的去除效果,采用酸碱改性方法,通过化学需氧量(COD)、总磷(TP)和酸碱性(pH)的判定,确定最佳改性方法及其最优条件,并对改性前后高炉矿渣进行红外光谱和XRD表征。结果表明:碱改性优于酸改性,COD和TP的去除率分别提高了5.70%和10.23%。碱性高炉矿渣氢氧化钠改性前后的较优条件都为在超声波作用下振荡时间80 min、投加量为0.4 g、温度为25℃。改性后COD和TP去除率可达79.30%和99.92%,较改性前提高了7.49%和3.42%,改性前后pH变化不大,分别为7.70和8.32。表征结果显示改性后高炉矿渣组分基本保持不变,只是提高了各组成成分的纯度。

The Comparative Study of Acidic Waste Purification by Alkaline Blast Furnace Slag with and without Modification

Acidor alkaline modification methods were adopted to study the removal effect of alkaline blast furnace slag on simulated acid water,furthermore,the best modification method and its optimal condition for optimal modification were determined by the COD,TP and pH,and also were characterized with IR and XRD.The results showed that alkali modification was better than acid modification,the COD and TP removal rate was increased by 5.70％ and 10.23％ respectively.The best condition of alkaline ammonium blast furnace slag before and after modification by sodium hydroxide was oscillation time of 80 min,dosage of 0.4 g and temperature of 25 ℃.Comparing with modification before,the COD and TP removal rate for blast furnace slag of alkali modification was increased by 7.49％ and 3.42％,being up to 79.30％ and 99.92％.Change of pH was little before and after modification.It was 7.70 and 8.32 respectively.The IR and XRD structure analysis on blast furnace slag indicated that the composition of modified blast furnace slag remained basically unchanged during the modification,and only improved the purity of the components.