摘要
针对赤泥大规模堆存对周边环境造成严重污染的问题,赤泥土壤化是实现赤泥规模化消纳,降低环境危害的可行方法。本研究通过使用稀硫酸对赤泥进行脱碱处理,然后掺入不同比例的地质聚合物固体废弃物和甘蔗废渣,分析混合后基质的物理性质和化学性质,探究地质聚合物固体废弃物协同甘蔗废渣对赤泥成土过程的影响。结果表明:酸洗后赤泥的pH值从11.30降至7.11,Na元素含量从10.711%降低至0.750%,脱碱率高达93%;掺入30%(质量分数)地质聚合物固体废弃物后,赤泥的pH值从7.12增加至8.21,孔隙度和非毛管孔隙度分别从43.43%和3.31%提高至61.35%和13.40%,均达到《绿色种植土壤》(CT/J 340—2016)的要求。进一步掺入40%(质量分数)的甘蔗废渣后,人工土壤的有机质含量从6.7 g/kg大幅增至28.5 g/kg,非毛管孔隙度进一步提升至20.39%,有效水含量从6.88%增加至16.16%,大团聚体比例升高,黑麦草生长状况良好。
In view of the serious pollution caused by the large-scale storage of red mud to the surrounding environment,soil formation of red mud is a feasible method to realize the large-scale consumption of red mud and reduce its environmental harm.In this study,red mud was dealkalized using dilute sulfuric acid,and then mixed with different proportion of geopolymer solid waste and sugarcane waste residue.The physical and chemical properties of the mixed matrix were analyzed to explore the synergistic effect of geopolymer solid waste and sugarcane waste residue on the soil formation process of red mud.The results show that after acid washing,the pH value of red mud decreases from 11.30 to 7.11,and the content of Na decreases from 10.711%to 0.750%,with the dealkaization rate is as high as 93%.After mixing with 30%(mass fraction)geopolymer solid waste,the pH value of red mud increases from 7.12 to 8.21,and the porosity and non-capillary porosity increases from 43.43%and 3.31%to 61.35%and 13.40%,respectively,both meeting the requirements of“Planting soil for greening”(CT/J 340—2016).After further mixing sugarcane waste residue with a mass ratio of 40%,the organic matter content of artificial soil increases significantly from 6.7 g/kg to 28.5 g/kg,the non-capillary porosity further increases to 20.39%,the available water content from 6.88%to 16.16%,the proportion of large aggregates increase,and ryegrass grow well.
作者
廖序
王涛
蒋传福
贺艳
崔学民
LIAO Xu;WANG Tao;JIANG Chuanfu;HE Yan;CUI Xuemin(College of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)
出处
《硅酸盐通报》
北大核心
2025年第8期2900-2911,共12页
Bulletin of the Chinese Ceramic Society
作者简介
廖序(1995-),男,硕士研究生。主要从事赤泥的无害化资源化利用的研究。E-mail:liaoxu@st.gxu.edu.cn;通信作者:崔学民,博士,教授。E-mail:cuixm@gxu.edu.cn。
