电解锰渣对熟石灰-矿渣体系硫酸盐激发性能研究  

Study on sulfate activation performance of electrolytic manganese residue in hydrated lime-slag system

作　　者：倪栋 唐亮[2] 何兆益[2] 王健 裴姗姗 夏磊 NI Dong;TANG Liang;HE Zhaoyi;WANG Jian;PEI Shanshan;XIA Lei(Research Institute of Highway Science,Ministry of Transport,Key Laboratory of Highway Traffic Environmental Protection Technology,Ministry of Transpor,Beijing 100088,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Xiongzhong Bilingual Primary School,Budapest 1158,China;School of materials science and engineering,Chang′an university,Xi′an 710064,China)

机构地区：[1]交通运输部公路科学研究所,公路交通环境保护技术交通运输行业重点实验室,北京100088 [2]重庆交通大学土木工程学院,重庆400074 [3]匈中双语学校,布达佩斯1158 [4]长安大学材料科学与工程学院,陕西西安710064

出　　处：《无机盐工业》2024年第11期151-157,共7页Inorganic Chemicals Industry

基　　金：公路交通环境保护技术交通运输行业重点实验室开放课题资助项目(2020-8805)。

摘　　要：电解锰渣(EMR)作为一种工业固体废弃物,含有大量重金属、氨氮及硫酸盐,对环境与人体健康造成巨大危害。为解决这一问题,利用EMR富含硫酸盐的特点,将其作为硫酸盐激发剂,研究了EMR对熟石灰-矿渣体系硫酸盐激发效果、水化机理、微观结构与污染物固化机理的影响。抗压强度、XRD及SEM-EDS测试研究表明,EMR对熟石灰-矿渣体系的激发效果较好,其最佳配比为:质量分数为50%的EMR、质量分数为46%的矿渣、质量分数为4%熟石灰,3、7、28 d抗压强度分别为15.55、27.44、44.52 MPa,相比未加EMR的熟石灰-矿渣体系,3、7、28 d抗压强度分别提升了1.65、1.80、1.97倍。在EMR激发下,熟石灰-矿渣体系的水化产物包括AFt(钙矾石)、C-(A)-S-H(水化硅铝酸钙),并且这些水化产物之间相互交织形成致密网络结构;而熟石灰-矿渣体系的主要水化产物是C-(A)-S-H,且其界面区域缝隙较大。EMR-熟石灰-矿渣体系水化过程中释放的OH-及形成的水化产物AFt、AFM(单硫型水化硫铝酸钙)、C-(A)-S-H能够对EMR中的重金属、氨氮进行离子置换、吸附、封裹与沉淀,最终使该体系浸出毒性满足《污水综合排放标准》(GB 8978—1996)的排放标准。Electrolytic manganese residue(EMR),as an industrial solid waste,contains a large amount of heavy metals,ammonia nitrogen,and sulfates,posing great harm to the environment and human health.To address this issue,this study utilized the sulfate rich nature of EMR as a sulfate activator to investigate the sulfate activation effect,hydration mechanism,microstructure,and pollutant solidification mechanism of EMR in the hydrated lime-slag system.The results from compressive strength,XRD,and SEM-EDS testing showed that EMR had a positive effect on the sulfate activation of the limestoneslag system,with the optimal ratio of 50%EMR,46%slag,and 4%quicklime.The compressive strengths at 3 d,7 d,and 28 d were 15.55,27.44 and 44.52 MPa,respectively,which were 1.65,1.80 and 1.97 times higher compared to the limestoneslag system without EMR at the corresponding ages.Under EMR activation,the hydration products of the hydrated lime-slag system were AFt(ettringite)and C-(A)-S-H(calcium silicate hydrate),interwoven to form a dense network structure.Whereas the main hydration products of the hydrated lime-slag system were C-(A)-S-H with larger pores in the transition interface zone.The released OH-and the formation of hydrated products including AFt,AFM and C-(A)-S-H and in the EMR-hydrated lime-slag system facilitated ion exchange,adsorption,encapsulation,and precipitation of heavy metals and ammonia nitrogen in EMR,ultimately meeting the leaching toxicity requirements of GB 8978—1996 emission standards.

关 键 词：电解锰渣 工业固废 硫酸盐 水化机理 重金属。 

分 类 号：TQ178[化学工程—硅酸盐工业] X781[环境科学与工程—环境工程]