Effect of Iron Content in Graphite Tailings from Luobei on Properties of Foamed Ceramics
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摘要:
通过磁选工艺降低石墨尾矿混合原料的铁含量，研究了铁含量对制备发泡陶瓷的性能影响。结果表明，磁选工艺可以显著降低石墨尾矿的铁含量；当磁选给矿−0.074 mm含量为71.64%、磁场磁感应强度为0.8 T、矿浆质量浓度为15%时，石墨尾矿TFe2O3含量从6.37%降低到2.18%。通过发泡陶瓷制备试验发现，磁选后的混合原料的TFe2O3含量从4.65%降低到1.81%，制备的发泡陶瓷外观颜色明显改善，抗压强度从7.2 MPa提高到7.9 MPa，导热系数从0.33 W/(m·K)提高到0.36 W/(m·K)；抗压强度有所提高，保温性能有所降低，整体上磁选前后发泡陶瓷的性能差异较小。
Abstract:This study focuses on reducing the iron content of graphite tailings through magnetic separation technology and investigating its effect on the properties of foamed ceramics. The results showed that the iron content in graphite tailings could be significantly reduced by magnetic separation processes. Specifically, the content of TFe2O3 in graphite tailings decreased from 6.37% to 2.18% when the content of −0.074 mm was 71.64%, the magnetic field induction was 0.8 T and the pulp density was 15%. Moreover, the appearance color of the foamed ceramics improved significantly, while the compressive strength increased from 7.2 MPa to 7.9 MPa, and the thermal conductivity increased from 0.33 W/(m·K) to 0.36 W/(m·K). After the magnetic separation process, the compressive strength of the foamed ceramics had been improved, and the thermal insulation performance had been reduced, but the overall performance remained largely unchanged.
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Key words:
- graphite tailings /
- iron content /
- foamed ceramics /
- properties
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表 1 石墨尾矿的化学成分
Table 1. Chemical composition of graphite tailings
/% 化学成分 SiO2 Al2O3 TFe2O3 TiO2 CaO MgO K2O Na2O 烧失量 质量分数 57.02 11.88 6.37 0.99 7.84 2.63 2.71 2.21 8.35 
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表 2 石墨尾矿的矿物组成
Table 2. Mineral composition of graphite tailings
/% 矿物组成 石英 微斜长石 白云母 方解石 白云石 绿泥石 磁黄铁矿 质量分数 40 21 15 10 5 4 5
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表 3 石墨尾矿粒度与化学组成
Table 3. Particle size and chemical composition of graphite tailings
粒度/mm 产率 化学组成/% SiO2 TFe2O3 Al2O3 K2O CaO MgO +0.50 10.23 60.87 3.43 11.84 3.34 6.67 1.92 −0.50+0.18 24.64 60.11 4.02 12.05 3.02 7.45 2.27 −0.18+0.15 30.99 57.65 5.68 12.31 2.77 8.29 2.54 −0.15+0.074 20.74 54.67 9.38 12.29 2.29 8.59 2.98 −0.074 13.40 51.39 10.93 12.17 2.41 9.12 3.57
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表 4 给料细度对磁选效果的影响
Table 4. Effect of feeding fineness on magnetic separation
/% −0.074 mm含量 产物 产率 TFe2O3含量 TFe2O3分布率 13.45 磁性产品 19.30 17.95 55.44 非磁性产品 80.70 3.45 44.56 47.83 磁性产品 7.69 46.69 57.37 非磁性产品 92.31 2.89 42.63 71.64 磁性产品 6.89 54.63 60.31 非磁性产品 93.11 2.66 39.69 87.92 磁性产品 6.84 55.73 60.96 非磁性产品 93.16 2.62 39.04
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表 5 矿浆质量浓度对磁选效果的影响
Table 5. Effect of pulp density on magnetic separation
/% 矿浆浓度 产物 产率 TFe2O3含量 TFe2O3分布率 25 磁性产品 7.12 50.11 56.90 非磁性产品 92.88 2.91 43.10 20 磁性产品 6.89 57.63 63.42 非磁性产品 93.11 2.46 36.58 15 磁性产品 6.54 65.37 68.33 非磁性产品 93.46 2.12 31.67 10 磁性产品 6.42 66.92 68.82 非磁性产品 93.58 2.08 31.18
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表 6 石墨尾矿磁选产品主要化学成分
Table 6. Main chemical components of graphite tailings magnetic separation products
/% 磁选产物 SiO2 TFe2O3 Al2O3 K2O CaO MgO 磁性产品 11.84 65.48 4.19 0.74 3.09 0.64 非磁性产品 61.08 2.18 12.54 2.91 8.31 3.11
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表 7 发泡陶瓷试验结果
Table 7. Test results of foamed ceramics
试验
条件原料
TFe2O3含量/%密度
/(kg·m−3)抗压强度
/MPa导热系数
/(W·m−1·K−1)1 4.65 530 7.2 0.33 2 1.81 570 7.9 0.36
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