Strength Characteristics and Mechanism of Tungsten Tailings Activated by the Different Biopolymers
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摘要:
为研究不同生物聚合物对钨尾矿的无侧限抗压强度的影响，以桂林兴安某钨尾矿为研究对象，测试不同4种生物胶的不同浓度和养护温度作用下试件强度发展规律；同时，结合XRD和SEM分析不同实验条件下钨尾矿的微观特征，探明生物胶与钨尾矿作用的微观机理。实验结果表明，瓜尔胶和黄原胶对强度影响显著，而壳聚糖和琼脂作用较弱；不同生物胶改良钨尾矿的较佳养护温度：瓜尔胶和壳聚糖为90 ℃，黄原胶和琼脂为100 ℃；瓜尔胶（胶固比为1.5%）养护温度≥70 ℃以及黄原胶养护温度≥60 ℃时，试样强度均大于10 MPa。符合建砖MU10的要求。本研究为实现钨尾矿的再利用提供了理论依据。
Abstract:In order to study the effect of different biopolymers on the unconfined compressive strength of tungsten tailings which come from Xing’an of Guilin, the strength of specimens activated by four different biopolymers was tested, and the specimens were prepared by considering the curing temperatures and the biopolymer concentrations. At the same time, the microscopic characteristics of all specimens were analyzed by XRD and SEM for analyzing the microscopic mechanism. The results showed that guar gum and xanthan gum had significant effects on the strength, while chitosan and AGAR had weak effects. The optimal curing temperature of biopolymer activated tungsten tailings depends on the biopolymer type, as follows, 90 ℃ for Guar gum and chitosan, and 100 ℃ for xanthan gum and AGAR. In addition, the strength of samples activated by the guar which the mass ratio to solid is 1.5% curing at temperature ≥70 ℃ and by the xanthan gum curing at temperature ≥60 ℃ were more than 10 MPa. It meets the strength requirements of building brick MU10. This results provide a theoretical basis for reusing of tungsten tailings.
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Key words:
- Tungsten tailings /
- Biopolymer /
- Unconfined compressive strength
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表 1 钨尾矿的主要矿物成分
Table 1. Main mineral composition of tungsten tailings
矿物 含量/% 矿物 含量/% 石英 43 钙铝榴石 7 斜长石 2 萤石 1 微斜长石 3 辉石 6 方解石 31 黏土 5 闪石 1 
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表 2 实验方案
Table 2. Test plan
序号 胶固比/% 养护
温度/℃序号 胶固比/% 养护
温度/℃1 0 80 5 1.5 60 2 0.5 6 70 3 1.0 7 90 4 1.5 8 100
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