论文部分内容阅读
含铅锌废物与建筑废物混合产生了重金属富集量较高的工业建筑废物烟尘.利用风力分选出此类废物中富集锌的颗粒,使样品含锌量提高10％～20％(w.t.％),但分离物中仍含有5％～15％(w.t.％)硅.使用NaOH对风选产物进行强碱浸出,发现锌的最大溶出率低于原始烟尘类物料,降低到45％ ～ 65％.建立组合式脱氯流程,高含氯烟尘样品用500W微波辐射加热3min,再组合水洗脱氯工艺,除氯率可达85％.最佳水洗条件为:液固比10∶1,温度50℃,浸出时间40 min,超声功率150W.拟建立含锌铅烟尘风选预处理-碱法回收-脱氯处理的技术工艺,为此类废弃物资源化利用提供新途径.“,”Zinc and lead containing waste are often mixed with industrial construction wastes in many factories,and generated large quantities of hazardous waste abundant in heavy metals.This paper performed wind classification process with a venturi throat to separate flue dust from the industrial construction wastes.The Zinc content increased by 10％ ～ 20 ％ in the sample,however,there is still 5％ ～ 15 ％ silicon in the sample.Alkaline leaching was performed on the sample using NaOH,and results showed that the dissolution rate of zinc decreased to 45 ％ ～65 ％,which was much lower than the original material.Subsequently,established a combined dechloriation process,dust with high chloride were heated for 3 minutes by 500W microwave radiation,followed by water washing dechloriation process,85％ Cl can be removed.The optimum parameters for washing step were 10∶1 L/S ratio,temperature at 50 ℃,40 min,150 W ultrasound power.