Study on Compressive and Flexural Properties of Red Mud/Fly Ash Filling Material for Coal Mine
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摘要:
以赤泥为主要原料制备煤矿井充填材料，研究了激发剂种类及其掺量、粉煤灰掺量、水泥掺量及加水量对充填材料抗压强度、抗折强度的影响。研究表明：激发剂A（主要成分为木质苯磺酸钙，用量为赤泥干基的0.5%）对充填材料的激发效果最为显著；且在一定条件下抗压、抗折强度下随粉煤灰添加量增加呈先增大后减小的变化趋势；随水泥添加量的增加逐渐增大。通过各方面试验得出最优强度为：28 d抗压强度为1.30 MPa，抗折强度为0.71 Mpa，满足相关充填指标。经过浸出毒性检验，结果表明赤泥基填充材料中重金属元素均达标。
Abstract:Red mud was used as the main raw material to prepare filling materials for coal mines. The effects of the types and amounts of activators, fly ash amounts, cement amounts, and water amounts on the compressive and flexural strength of the filling materials were studied. The research showed that activator A (mainly composed of calcium lignosulfonate and added with 0.5% of dry red mud) had the most significant excitation effect on the filling material. Under certain conditions, the compressive and flexural strength first increased and then decreased with the increase of fly ash amounts, and gradually increased with the increase of the cement amounts. The optimal strength indicators obtained through various tests were as follows, the compressive strength at 28 days was 1.30 MPa, and the flexural strength was 0.71 Mpa, meeting the relevant filling indicators. The results showed that the heavy metal elements in the red mud based filling materials met the relevant emission standards after the leaching toxicity test.
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Key words:
- coal mine well /
- red mud /
- filling /
- leaching toxicity
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表 1 赤泥的主要化学成分
Table 1. Main chemical composition of red mud
/% 成分 Al2O3 Fe2O3 SiO2 CaO Na2O TiO2 Ga2O3 其他 灼减 含量 20.73 20.74 17.19 15.85 6.39 5.29 0.0044 5.51 8.3 
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表 2 粉煤灰的化学成分
Table 2. Chemical composition of fly ash
/% 成分 SiO2 Al2O3 Fe2O3 TiO2 CaO C 含量 46.09 28.08 9.61 3.13 2.74 4.39
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表 3 矿井水的化学成分
Table 3. Chemical composition of mine water
/(mg·L−1) COD 总磷 pH SS 氨氮 总氮 氟化物 硫化物 六价铬 石油类 249 13.4 2.78 106 23.2 50.9 2.41 0.01 0.009 0.72 铁 锰 铜 锌 铅 镉 铬 汞 砷 硒 3195 12.1 1.13 1.71 0.02630 0.31392 0.08 0.00295 0.00471 0.0004
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表 4 赤泥基填充材料毒性浸出结果
Table 4. Toxicity leaching results of red mud based filling materials
/（mg·L−1） 铅 锌 铜 镉 铅 锌 铜 镉 总锰 总铁 ND ND ND ND ND ND ND ND ND ND
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