Preparation of road base material by utilizing electrolytic manganese residue based on Si-Al structure: Mechanical properties and Mn2+ stabilization/solidification characterization.,Journal of Hazardous Materials

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Preparation of road base material by utilizing electrolytic manganese residue based on Si-Al structure: Mechanical properties and Mn2+ stabilization/solidification characterization.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-24 , DOI: 10.1016/j.jhazmat.2020.122188
Yuliang Zhang ₁ , Xiaoming Liu ₂ , Yingtang Xu ₂ , Binwen Tang ₂ , Yaguang Wang ₂

Affiliation

Electrolytic manganese residue (EMR) is a potentially harmful industrial solid waste that should be addressed. In the study, the red mud, carbide slag and blast furnace slag were used as stabilization/solidification (S/S) agents to S/S Mn2+, and simultaneous reused it as raw material to prepare road base material. The S/S behavior of manganese, unconfined compressive strength (UCS) of road base material with different Al/Si ratios, leaching test and the S/S mechanisms were investigated. The results showed that the Mn2+ can be well solidified when the S/S agents reach up to 20 %. The 7-day UCS of the road base material was 6.1 MPa with the Al/Si ratio of 0.48, which meets the highway standards. When Al/Si = 0.48, the formation amount of CaAl2Si2O8·4H2O and ettringite increased, which promoted the adsorption and wrap of Mn2+. The content of active AlⅣ and AlⅥ increased after S/S. Mn2SiO4 and Ca4Mn4Si8O24 were produced by the charge balance effect, and the new chemical bond was formed. Meanwhile, the Mn2+ is oxidized to more stable MnO2 to achieve the S/S of Mn2+. This research provides an effective way to solidify Mn2+ and solves the problem of large-scale utilization of EMR and other solid waste.

中文翻译：

利用基于Si-Al结构的电解锰残留物制备路基材料：力学性能和Mn2 +稳定/固化特性。

电解锰残留物（EMR）是一种潜在的有害工业固体废物，应予以解决。在研究中，赤泥，碳化物矿渣和高炉矿渣被用作S / S Mn2 +的稳定/固化（S / S）剂，并同时将其作为原料再用于制备路基材料。研究了锰的S / S行为，不同Al / Si比的道路基材的无侧限抗压强度（UCS），浸出试验和S / S机理。结果表明，当S / S剂达到20％时，Mn2 +可以很好地固化。道路基材的7天UCS为6.1 MPa，Al / Si比为0.48，符合高速公路标准。当Al / Si = 0.48时，CaAl2Si2O8·4H2O和钙矾石的形成量增加，促进了Mn2 +的吸附和包裹。S / S处理后，活性AlⅣ和AlⅥ的含量增加。通过电荷平衡效应产生了Mn2SiO4和Ca4Mn4Si8O24，并形成了新的化学键。同时，Mn2 +被氧化为更稳定的MnO2，以实现Mn2 +的S / S。该研究为固化Mn2 +提供了有效途径，解决了EMR等固体废物的大规模利用问题。

更新日期：2020-01-24

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