摘要
采用改性β-半水磷石膏(MPG)(组成(w):50%β-半水磷石膏、23%矿渣、15%磷渣、10%熟料和2%生石灰)对含铅淤泥进行固化稳定化。实验结果表明:MPG固化材料对含铅淤泥固化效果显著,养护28 d后MPG固化体的无侧限抗压强度比水泥固化体提高了73.59%,pH降低了18.24%;MPG固化体的含水率比未固化淤泥降低了48.35%,Pb(Ⅱ)浸出浓度降低了98.48%,仅为0.032 mg/L,低于GB 3838—2002中Ⅲ类地表水Pb(Ⅱ)限值。表征结果显示,MPG固化体中生成大量钙矾石晶相,与C—S—H凝胶紧密连接,使固化体结构更加密实。
The solidification and stabilization of lead-bearing sludge was carried out by using the modified β-hemihydrate phosphogypsum (MPG),which was composed of 50%(w) β-hemihydrate phosphogypsum,23%(w) slag,15%(w) phosphorous slag,10%(w) clinker and 2%(w) quicklime.The experimental results show that MPG curing material has remarkable curing effect on lead-bearing sludge,and after curing for 28 d,the unconfined compressive strength of MPG solidified body increases by 73.59% and pH decreases by 18.24% compared with those of cement solidified body;The water content of MPG solidified sludge is 48.35% lower than that of unsolidified sludg,and the leaching concentration of Pb(Ⅱ) decreases by 98.48% and is only 0.032 mg/L,which is lower than the Class Ⅲ limit of Pb(Ⅱ) in surface water in GB 3838-2002.The characterization results show that a large number of ettringite crystal phases are formed in the MPG solidified body,which can make the solidified body structure more dense by closely connection with C—S—H gel.
作者
董江峰
姜明明
赵小蓉
谢秀情
黄绪泉
DONG Jiangfeng;JIANG Mingming;ZHAO Xiaorong;XIE Xiuqing;HUANG Xuquan(College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,China;Engineering Research Center of Eco-environment in Three Gorges Reservoir Region,Ministry of Education,Yichang 443002,China;Hubei Province College-Enterprise Cooperation Innovation Center for Comprehensive Utilization of Phosphogypsum,Yichang 443002,China;WISDRI City Environment Protection Engineering Co.Ltd,Wuhan 430205,China)
出处
《化工环保》
CAS
CSCD
北大核心
2022年第2期231-236,共6页
Environmental Protection of Chemical Industry
基金
宜昌市研究与开发计划项目(A20-302a-07)。
关键词
含铅淤泥
固化
β-半水磷石膏
抗压强度
浸出
lead-bearing sludge
solidification
β-hemihydrate phosphogypsum
compressive strength
leaching
