地聚物材料固化含砷废渣抗冻融性能研究
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摘要
为了处理有色金属冶炼厂产生的含砷废渣,利用磷渣-粉煤灰基地聚物材料对其进行固化处理,对固化体抗冻融性能进行研究,考察不同冻融方式、冻融循环次数等条件下固化体的相对质量变化、抗压强度、砷浸出率特性,并采用XRD、SEM等表征手段分析冻融前后固化体的物相组成及形貌变化。结果表明:采用不同的冻融方式,随着冻融循环次数的增加,固化体的相对质量变化不大;抗压强度有所下降,经15次冻融循环,强度仍可高于15 MPa,固化体砷浸出率呈上升趋势,砷浸出率仅为0.27%。XRD及SEM分析表明,冻融前后固化体中矿物相基本未发生变化以及固化体未发生崩裂现象,说明固化体具有较强的抗冻融性能。
A geopolymer based on phosphorous slag and fly ash was used to solidify the arsenic-containing waste residue discharged from a nonferrous metallurgical plant. The resistance to freeze-thaw of the solidified forms was researched and the change of mass,compressive strength and arsenic leaching ratio under different thawing methods and different freeze-thaw cycles were investigated. Meanwhile,the morphology and phase compositions of solidified form were analyzed by means of X-ray diffraction(XRD)and Scanning electron microscopy(SEM). The results show that the mass of the solidified form changed little and the compressive strength decrease,but it still higher than 15 MPa after 15 frezzing-thawing cycles. The arsenic leaching ratio increase,but the arsenic leaching ratio only reach to 0. 27% after 15 freezzing-thawing cycles. It is showed by XRD and SEM that the mineral phase in the solidified form have not changed basically and no fragmentation existed after freeze-thaw cycles. This show that the solidified form has stronger freeze-thaw resistance.
A geopolymer based on phosphorous slag and fly ash was used to solidify the arsenic-containing waste residue discharged from a nonferrous metallurgical plant. The resistance to freeze-thaw of the solidified forms was researched and the change of mass,compressive strength and arsenic leaching ratio under different thawing methods and different freeze-thaw cycles were investigated. Meanwhile,the morphology and phase compositions of solidified form were analyzed by means of X-ray diffraction(XRD)and Scanning electron microscopy(SEM). The results show that the mass of the solidified form changed little and the compressive strength decrease,but it still higher than 15 MPa after 15 frezzing-thawing cycles. The arsenic leaching ratio increase,but the arsenic leaching ratio only reach to 0. 27% after 15 freezzing-thawing cycles. It is showed by XRD and SEM that the mineral phase in the solidified form have not changed basically and no fragmentation existed after freeze-thaw cycles. This show that the solidified form has stronger freeze-thaw resistance.
引文
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[2]Dutre V,Vandecasteele C.Solidification/stabilization of arsenic-containing waste:leach tests and behavior of arsenic in the leachate[J].Waste Manage,1995,15(1):55.
[3]Corwin D L,David A,Goldber S.Mobility of arsenic in soil from the Rocky Mountain area[J].J.Contam Hydrol,1999,39(1/2):35.
[4]Mari P K,Pentti K G M.Speciation of mobile arsenic in samples as a function of p H[J].Sci.Total Environ.,1997,204(2):193.
[5]李柏林,李晔,汪海涛,等.含砷废渣的固化处理[J].化工环保,2008,28(6):153.
[6]李艺.有色金属矿山砷污染对生态环境的影响及其治理分析[J].地球与环境,2008,36(3):256.
[7]田文增,陈白珍,仇永海.有色冶金工业含砷物料处理及利用现状[J].湖南有色金属,2004,20(6):11.
[8]刘瑞广,高麒麟,刘晓明.含有机砷废物无害化处理方法[J].辽宁师范大学学报,2010,33(2):1.
[9]张洪,张召述,黄宗凯,等.低温陶瓷胶凝材料固化脱硫砷渣研究[J].化学研究与应用,2012,11(24):1729-1735.
[10]程红强,高丹盈.聚丙烯纤维混凝土冻融损伤试验研究[J].东南大学学报:自然科学版,2010,40(S):97-200.
[11]刘大鹏,霍俊芳.纤维轻骨料混凝土冻融损伤模型研究[J].硅酸盐通报,2009,28(3):568-571.
[12]汪在芹,李家正,周世华,等.冻融循环过程中混凝土内部微观结构的演变[J].混凝土,2012,1(5):13-14.
[13]严耿升,张虎元,王晓东,等.干旱区土建筑遗址冻融耐久性研究[J].岩土力学,2011,32(8):2267-2273.
[14]周元康,夏举佩,周新涛,等.磷渣基胶凝材料固化含砷废渣研究[J].硅酸盐通报,2014,6(33):1324.
[15]徐建忠,周云龙,唐然肖.地聚合物水泥固化重金属的研究[J].建筑材料学报,2006,9(3):341-346.