锂渣物化特性及其碱激发制备人造集料实验

    Physical and Chemical Properties of Lithium Slag and Experiment on Preparation of Artificial Aggregate Using Alkali-activation

    • 摘要: 这是一篇陶瓷及复合材料领域的论文。伴随着我国锂矿冶炼规模增长,锂渣产量逐年增加,其资源化利用的必要性日趋凸显。为探明锂渣的物化性能及其作为胶凝材料制备人造集料的潜力,首先通过实验表征了宜春市锂云母锂渣和澳大利亚锂辉石锂渣的组成和性能,并分析其对碱激发性能的影响。其次,以氢氧化钠为碱激发剂,采用圆盘冷造粒法制备了两种锂渣人造集料,并测试了其抗压强度。最后,通过玻璃电极法、电感耦合等离子体质谱法、离子色谱法和分光光度法等实验论证了人造集料的环境风险。结果表明:锂云母锂渣的物化性质较锂辉石锂渣更适合用于碱激发制备人造集料,所制得的人造集料强度更高,液体浸出物也不具有环境危害性。

       

      Abstract: This is an article in the field of ceramics and composites. With the growth of lithium smelting scale in China, the production of lithium slag increases year by year, the need for its resource utilization is becoming more and more obvious. To explore the physical and chemical properties of lithium slag and its potential as a cementitious material to prepare artificial aggregate, the composition and properties of lithium mica lithium slag in Yichun, China and lithium slag from spodumene in Australia were characterized, and their effects on alkali excitation performance were analyzed. Secondly, two kinds of lithium slag artificial aggregates were prepared by disk cold granulation method with sodium hydroxide as alkali activator, and their compressive strength was tested. Finally, the environmental risks of artificial aggregates were demonstrated by glass electrode method, inductively coupled plasma mass spectrometry, ion chromatography and spectrophotometry. The results show that the physical and chemical properties of lithium mica lithium slag are more suitable for the preparation of artificial aggregates by alkali excitation than lithium pyroxene lithium slag, and the resulting artificial aggregates are stronger and the liquid leachate is not environmentally hazardous.

       

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