钢铁冶金烧结除尘灰中铅的浸取回收和一氧化铅的制备  

Recovery of lead in sintering electric dust from steel metallurgical and prepartion of lead oxide

作　　者：付志刚[1] 张梅[1] 吕娜[1] 王威燕[1] 刘文英[1] 杨运泉[1] FU Zhigang ZHANG Mei LU Na WANG Weiyan LIU Wenying YANG Yunquan(School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China)

机构地区：[1]湘潭大学化工学院,湖南湘潭411105

出　　处：《中南大学学报（自然科学版）》2016年第10期3302-3308,共7页Journal of Central South University:Science and Technology

基　　金：湖南省自然科学基金资助项目(14JJ5027);国家水体污染控制与治理科技重大专项(2010ZX07212-008)~~

摘　　要：研究一种以钢铁冶金烧结机头电除尘灰为原料,湿法浸取回收其中的氯化铅并利用其制取一氧化铅的工艺技术。采用HCl-NaCl混合溶液将烧结灰中的铅以PbCl_4^(2-)形式络合浸取回收。利用所回收的氯化铅制备一氧化铅。实验考察浸取工艺中多种因素对浸取效率的影响,研究浸取母液的循环使用效果和一氧化铅制备过程的转化条件。研究结果表明:在温度为85~90℃,氯化钠质量浓度为250 g/L,工业盐酸用量为25 m L/(100 g),富铅烧结灰(尾泥)与HCl-NaCl混合溶液的固液比为1.0:3.0 g/m L,浸取时间为30 min的条件下,在浸取过程中铅的浸取率在99.50%以上;冷析母液循环使用2次,铅的总回收率达95.08%;碳酸钠的加入量为其理论量的0.90~1.00倍,铅的沉淀率为99.90%,转化得到的沉淀在650℃煅烧5 h,得到的一氧化铅产品纯度为99.50%,达到HG/T 2325—2004标准中工业一级品的指标要求。The recovery of lead chloride from ferrous metallurgy sintering electric dust with wet leaching and the preparation of lead oxide were discussed by using HCl-Na Cl mixture solution as leaching agent. A variety of factors which affect the efficiency of the leaching were investigated. The recycling effect of the leaching solution and the conversion conditions of PbCl2 to PbO were probed. The results show that, under the optimum conditions for the leaching process with the leaching temperature range of 85-90 ℃, NaCl mass concentration of 250 g/L in the leaching system, the amount of industrial hydrochloric acid of 25 m L/（100 g） sintering electric dust, the solid-liquid mass ratio of the dust to HCl-Na Cl solution of 1.0：3.0 g/m L and the leaching time of 30 min, the leaching efficiency of Pb from the dust is over 99.50%.With 2 cycles of the crystalled mother liquor, the total recovery of lead can reach 95.08%. In the conversion of PbCl2 to PbO, the amount of sodium carbonate is 0.90 to 1.00 times of its theoretical amount, and the precipitate yield of lead is 99.90%. By calcining the precipitate at 650 ℃ for 5 h, the lead oxide product is obtained with purity of 99.50%, which meets the requirement of the first class index in the national standard HG/T 2325-2004.

关 键 词：烧结除尘灰 HCl-NaCl混合溶液 络合浸出 氯化铅 一氧化铅 回收 

分 类 号：TQ131.13[化学工程—无机化工]