瓜尔胶处理铝土矿矿泥强度特性及微观机制

金属矿山 ›› 2024, Vol. 53 ›› Issue (4): 236-.

瓜尔胶处理铝土矿矿泥强度特性及微观机制

施航向1,2　蒙剑坪1,2　纪静茹1,2　颜荣涛1,2

1. 桂林理工大学土木与建筑工程学院,广西桂林 541004;2. 广西岩土力学与工程重点实验室,广西桂林 541004

出版日期:2024-04-15 发布日期:2024-05-19

Strength Characteristics and Microscopic Mechanism of Bauxite Slime Treated by Guar Gum

SHI Hangxiang1,2　MENG Jianping1,2　JI Jingru1,2　YAN Rongtao1,2

1. School of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China; 2. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin 541004,China

Online:2024-04-15 Published:2024-05-19

摘要/Abstract

摘要： 生物聚合物作为一种新型环境友好的土壤处理及改良材料,即使使用量很小,也能对土体具有显著的强化作用,因此近年来得到了广泛的运用。本文对不同胶土比(0%、1%、1. 5%和2%)瓜尔胶处理的铝土矿矿泥试样进行了界限含水率测试、快剪试验、核磁共振试验(NMR)和扫描电镜(SEM)等室内试验。试验结果表明,随着生物聚合物的增加,铝土矿矿泥的液塑限及抗剪强度均有所提高,其中2%瓜尔胶含量的铝土矿泥液限提升了26%,黏聚力提升了182%。NMR 试验表明了瓜尔胶能够使铝土矿矿泥试样的含水量增大,且其内部会出现大孔隙。而SEM 图证实了瓜尔胶和铝土矿矿泥颗粒形成瓜尔胶—铝土矿矿泥基质,从而提高了液塑限及抗剪强度。

关键词: 抗剪强度　液塑限　瓜尔胶　微观机制　铝土矿矿泥

Abstract: Biopolymers,as a novel environmentally friendly soil treatment and improvement material,have gained extensive applications in recent years,even in small quantities,due to their significant strengthening effect on soil. In this study,laboratory experiments were conducted on bauxite slime samples treated with different concentrations (0%,1%,1. 5%,and 2%) of guar gum. These experiments included testing for Atterberg limits,quick shear tests,nuclear magnetic resonance (NMR) experiments, and scanning electron microscopy (SEM). The experimental results indicate that with the increase in biopolymer content,both the liquid limit and shear strength of bauxite slime improved significantly. Specifically,the bauxite slime treated with 2% guar gum exhibited a 26% increase in liquid limit and a remarkable 182% increase in cohesion. NMR experiments revealed that guar gum could increase the moisture content of bauxite slime samples and create large internal pores within them. Additionally,SEM images confirmed the formation of a guar gum-bauxite slime matrix,thereby enhancing both the liquid limit and shear strength.

Key words: shear strength,liquid limit,guar gum,microstructural mechanisms,bauxite slime

施航向, 蒙剑坪, 纪静茹, 颜荣涛. 瓜尔胶处理铝土矿矿泥强度特性及微观机制[J]. 金属矿山, 2024, 53(4): 236-.

SHI Hangxiang, MENG Jianping, JI Jingru, YAN Rongtao. Strength Characteristics and Microscopic Mechanism of Bauxite Slime Treated by Guar Gum[J]. Metal Mine, 2024, 53(4): 236-.

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