【摘要】 粉石英尾渣是粉石英矿开采过程中产生的固体废弃物，富含硅、铝元素。其中硅质组分可直接作为合成托贝莫来石的硅源，铝质组分在水热合成中可诱导成核，促进托贝莫来石生成。采用一步水热法，以粉石英尾渣为主要原料制备托贝莫来石保温材料，探讨水热温度与水热时间对产物纯度、体积密度、孔隙率、微观形貌及导热性能的影响。研究结果表明，以粉石英尾渣和CaO为原料，可合成以托贝莫来石为主晶相的保温材料；在CaO、SiO₂摩尔比为1、NaOH用量为50 g/L、反应温度为200℃，反应16 h的条件下，制得的材料体积密度为0.496 g/cm³，导热系数低至0.049 W/（m·K）。使用粉石英尾渣一步水热法制备托贝莫来石保温材料不仅解决了粉石英尾渣堆积问题，同时为粉石英尾渣的资源化利用提供了新途径。更多还原

【Abstract】 Powdered quartz tailings, solid waste discharged after the mining of powdered quartz ore, are rich in silicon and aluminum. The siliceous components can directly serve as the silicon source for tobermorite, while the aluminum components induce nucleation during hydrothermal synthesis, accelerating the formation of tobermorite. A one-step hydrothermal method was employed to prepare tobermorite-type thermal insulation materials, and the effects of hydrothermal temperature and hydrothermal time on the purity, density, porosity, microstructure, and thermal conductivity of the resulting tobermorite-type thermal insulation materials were investigated. The research results indicate that the primary product synthesized through the reaction between powdered quartz tailings and CaO is tobermorite. Under the conditions of CaO to SiO₂ molar ratio of 1, NaOH dosage of 50 g/L, reaction temperature of 200℃, and reaction time of 16 h, a tobermorite-type thermal insulation material with bulk density of less than 0.496 g/cm³ and thermal conductivity of 0.049 W/（m·K） was synthesized. The utilization of a one-step hydrothermal method with powdered quartz tailings for preparing tobermorite-type thermal insulation materials not only resolves the issue of powdered quartz tailings accumulation but also provides a novel approach for the resource utilization of powdered quartz tailings.更多还原