拜耳法赤泥与粉煤灰地质聚合物早期水化及机理研究
收稿日期: 2024-09-30
网络出版日期: 2025-01-06
基金资助
国家自然科学基金(52478251)
Study on early hydration and mechanism of Bayer red mud and fly ash geopolymer
Received date: 2024-09-30
Online published: 2025-01-06
赤泥是铝土矿提炼氧化铝产生的工业固废，其在替代水泥制备胶凝材料的应用中水化机理和聚合行为尚不明确。研究通过抗压强度、X射线衍射仪（XRD）、电感耦合等离子体发射光谱仪（ICP）和扫描电镜-能谱（SEM-EDS）等测试方法对拜耳法赤泥与粉煤灰地质聚合物（RFP）的力学性能和水化产物进行表征，并对赤泥的水化机理和行为进行分析。研究发现，随着赤泥与粉煤灰质量比增加，试块的抗压强度逐渐增加，在质量比为1∶1时，抗压强度最高，为32.3 MPa。在RFP聚合形成强度的过程中，首先水泥的水化反应贯穿始终，随后矿物掺合料中的活性氧化铝和活性氧化硅开始反应生成硅铝酸盐产物，XRD和离子浓度的测试结果表明Fe3+取代Ca2+发生在这一过程，碳化反应最后发生。研究为探究拜耳法赤泥制备地质聚合物提供理论支持，对于综合利用赤泥工业固废具有重要意义。
李长江 , 管学茂 , 刘小星 , 张能 , 罗锦涛 . 拜耳法赤泥与粉煤灰地质聚合物早期水化及机理研究[J]. 无机盐工业, 2025 , 57(11) : 83 -90 . DOI: 10.19964/j.issn.1006-4990.2024-0521
Red mud is an industrial solid waste generated from the refining of alumina in bauxite mines and there are still problems with its hydration mechanism and polymerization behavior when used as a cementitious material to replace cement.In this study，the mechanical properties and hydration products of Bayer red mud and fly ash geopolymer（RFP） were characterised by compressive strength，X-ray diffraction（XRD），inductively coupled plasma emission spectrometer（ICP） and scanning electron microscope-energy spectroscopy（SEM-EDS） testing methods，as well as the hydration mechanism and behaviour of the red mud.It was found that the strength was increased gradually with the increase in the ratio of red mud to fly ash，reaching a maximum of 32.3 MPa at a ratio of 1.During the RFP polymerisation to produce strength，hydration of the cement occured throughout the polymerisation process，followed by the reaction of reactive alumina and reactive silica in the mineral admixture to produce silica-aluminate products and finally carbonation.The results of XRD and ionic concentration tests indicated the presence of Fe3+ substitution for Ca2+ to generate ferroaluminate aggregation during RFP hydration.This study provided theoretical support for the investigation of the production of geopolymers from red mud by the Bayer method，which was of great importance for the widespread use of red mud as an industrial solid waste.
Key words： Bayer red mud; fly ash; geopolymers; hydration mechanism; hydration behavior
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