基于响应面法的钒钛铁尾矿基地聚物配比优化  

Optimization of Geopolymer Ratio for Vanadium-Titanium Iron Tailings Base Geopolymer Based on Response Surface Methodology

作　　者：聂少君 韩秀丽 刘磊[1,2,3] 孟广安 邹玄[5] 王玲 NIE Shaojun;HAN Xiuli;LIU Lei;MENG Guang′an;ZOU Xuan;WANG Ling(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;Collaborative Innovation Center of Mineral Resources Green Development and Ecological Restoration,Tangshan 063210,China;Hebei Mining Development and Safety Technology Laboratory,Tangshan 063210,China;Hebei Provincial Geological and Mineral Research Center,Shijiazhuang 050051,China;Mining Branch of Hegang Group International Logistics Co.,Ltd.,Shijiazhuang 050051,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]矿产资源绿色开发与生态修复协同创新中心,河北唐山063210 [3]河北省矿业开发与安全技术实验室,河北唐山063210 [4]河北省地质矿产研究中心,河北石家庄050051 [5]河钢集团国际物流有限公司矿业分公司,河北石家庄050051

出　　处：《金属矿山》2024年第9期275-282,共8页Metal Mine

基　　金：国家自然科学基金项目(编号:51774140);河北省自然科学基金项目(编号:E2021209147);河北省科技厅钢铁实验室项目(编号:23564101D);华北理工大学重点科研项目(编号:ZD-ST-202308);河北省中央引导地方科技发展资金项目(编号:236Z3804G)。

摘　　要：为促进钒钛铁尾矿高质量、规模化地有效利用,以钒钛铁尾矿为主要原料制备地聚物胶凝材料,采用响应面法Central Composite Design设计,研究n(SiO_(2))/n(Al_(2)O_(3))、Na_(2)CO_(3)掺量和液固比对地聚物抗压强度的影响并揭示强度形成机理,通过构建回归模型探究各因素对抗压强度的影响程度,以获得性能最佳配比。结果表明,n(SiO_(2))/n(Al_(2)O_(3))对地聚物抗压强度影响最大,液固比影响最小,且三者之间存在一定交互作用。钒钛铁尾矿与偏高岭土在碳酸钠激发作用下发生了聚合反应与水化反应,生成N—A—S—H凝胶与C—S—H凝胶等,同时钒钛铁尾矿的微集料效应对地聚物抗压强度也有一定贡献,故地聚物强度形成主要来自胶凝体与集料间紧密交织组成的致密结构。当n(SiO_(2))/n(Al_(2)O_(3))=2.7,Na_(2)CO_(3)掺量55%,液固比0.25m L/g时,地聚物抗压强度预测值为51.769MPa,试验值为50.320MPa,相对误差在合理范围内,证实了响应面法能有效优化配比并具有较好的预测能力。In order to promote the high-quality and large-scale effective utilization of vanadium-titanium iron tailings,geopolymer cementitious materials were prepared using vanadium-titanium iron tailings as the main raw material.The Central Composite Design design in response surface methodology was used to study the effects of n(SiO_(2))/n(Al_(2)O_(3)),Na_(2)CO_(3)content and liquid-solid ratio on the compressive strength of geopolymer and reveal the mechanism of strength formation.A regression model was constructed to explore the degree of influence of various factors and their interactions,thus obtain the best performance ratio.The results indicated that n(SiO_(2))/n(Al_(2)O_(3))has the greatest impact on the compressive strength of geopolymer,while the liquid-solid ratio has the least impact,and there is a certain interaction between the three.Under the excitation of sodium carbonate,vanadium titanium iron tailings and metakaolin undergo polymerization and hydration reactions,generating N—A—S—H gel and C—S—H gel and so on.At the same time,the micro aggregate effect of vanadium titanium iron tailings also contributes to the compressive strength of geopolymer,so the formation of geopolymer strength mainly comes from the dense structure closely interwoven between the gel and aggregate.With n(SiO_(2))/n(Al_(2)O_(3))=2.7,Na_(2)CO_(3)dosage of 55%,the liquid solid ratio of 0.25 mL/g,the predicted compressive strength of the geopolymer is 51.769 MPa,and the experimental value is 50.320 MPa.The relative error is within a reasonable range,confirming that the response surface method can effectively optimize the ratio and has good predictive ability.

关 键 词：钒钛铁尾矿 地聚物 响应面法 配比 交互作用 

分 类 号：TU528[建筑科学—建筑技术科学] TD926[矿业工程—选矿]