首页|H2SO4溶液作用下一元碱激发钨尾矿基胶凝材料强度及微观特征

H2SO4溶液作用下一元碱激发钨尾矿基胶凝材料强度及微观特征

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针对碱激发材料的耐酸性,研究以NaOH、KOH为激发剂,某钨尾矿为前驱体,设置 3 种碱固比(碱激发剂质量与尾矿质量之比)、考虑 3 种pH值的溶液,分析了H2SO4 溶液作用下碱激发钨尾矿基胶凝材料试样的无侧限抗压强度变化规律,结合扫描电镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和电感耦合等离子体发射光谱仪(ICP-OES)测试结果,探讨了H2SO4 溶液对碱激发钨尾矿基胶凝材料试样强度的影响机理.试验结果表明,蒸馏水对一元碱激发钨尾矿基凝胶材料试样强度的软化作用强于硫酸溶液,主要是由于难溶的硫酸钙以及生成的凝胶覆盖在试样表面减缓了酸腐蚀,且膜状凝胶抵抗酸侵蚀的能力强于三维网状凝胶.硫酸溶液作用下碱激发钨尾矿基胶凝材料试样的强度受碱类型、碱浓度和溶液浓度共同影响.研究结果可为钨尾矿资源化利用提供科学依据和参考价值.
Strength and Microscopic Characteristics of Tungsten Tailings-based Cementing Material Excited by a Single Alkali under H2SO4 Solution
Aiming at the acid resistance of alkali-activated materials,NaOH and KOH were used as activators,and a tungsten tailings was used as precursor.Three kinds of alkali-solid ratios(the ratio of alkali activator mass to tailings mass)and three kinds of pH solutions were set.The variation of unconfined compressive strength of alkali-activated tungsten tailings-based cementitious materials under the action of H2SO4 solution was analyzed.Combined with scanning electron microscopy(SEM),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR)and inductively coupled plasma optical e-mission spectrometer(ICP-OES)test results,the influence mechanism of H2SO4 solution on the strength of alkali-activated tungsten tailings-based cementitious materials was discussed.The results showed that the softening effect of distilled water on the strength of alkali-activated tungsten tailings-based gel samples is stronger than that of sulfuric acid solution,which is mainly due to the insoluble calcium sulfate and the generated gel covering the surface of the sample to slow down the acid corrosion,and the film-like gel has stronger resistance to acid corrosion than the three-dimensional network gel.The strength of alkali-ac-tivated tungsten tailings-based cementitious material samples under the action of sulfuric acid solution is affected by alkali type,alkali concentration and solution concentration.The research results can provide scientific basis and reference value for the resource utilization of tungsten tailings.

alkali excitationtungsten tailingssulfuric acidstrengthmicroscopic

夏炜燕、刘之葵、李善梅、曹佳豪

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桂林理工大学土木与建筑工程学院,广西 桂林 541004

广西岩土力学与工程重点实验室,广西 桂林 541004

碱激发 钨尾矿 硫酸 强度 微观

2024

金属矿山
中钢集团马鞍山矿山研究院 中国金属学会

金属矿山

CSTPCD北大核心
影响因子:0.935
ISSN:1001-1250
年,卷(期):2024.(11)