镁基氯化物熔盐储热材料高温热稳定性的基础研究

项目名称： 镁基氯化物熔盐储热材料高温热稳定性的基础研究

项目编号： No.U1507121

项目类型： 联合基金项目

立项/批准年度： 2016

项目学科： 有机化学

项目作者： 魏小兰

作者单位： 华南理工大学

项目金额： 50万元

中文摘要： 本项目以盐湖钾肥生产MgCl2尾矿高值资源化，促进其在工业节能和可再生能源规模化利用等能源技术中的应用为目标，针对氯化物熔盐材料高温稳定性问题，结合化学、热科学和材料科学发展趋势，拟开展复杂氯化物熔盐体系热力学模型建立和液-气相图计算、临沸温域氯化物熔盐材料结构演化与相变、矿盐中杂质离子对熔盐材料高温热稳定性影响3个方面的研究。.基于氯化物熔盐配位特性，建立过剩自由能热力学模型，采用等化学势法计算熔盐体系液-气相图，预报熔盐材料沸点；测量临沸温域熔盐材料各组元偏径向分布函数随温度变化，获得熔盐材料微结构演化和突变规律，探悉熔盐液-气相变微观本质；实验研究矿盐中杂质离子对熔盐材料热稳定性影响，确定熔盐材料中杂质离子的最大允许限量。为提高熔盐材料热稳定性提供理论支持，为尾矿弃盐高值资源化利用提供创新成果。

中文关键词： 氯化镁；熔盐材料；稳定性；液-气相平衡；微结构

英文摘要： Taking KCl fertilizer production tailings derived from Saline Lake as a resource for reusing them in new application fields of industrial energy saving and the large-scale utilization of renewable energy, we propose to carry out the fundamental research on three key scientific issues on thermal stablity of chloride molten salts materials at high teperature combining with the chemical, thermal and material science as well as their latest development. The proposed research includes: (a) develop a thermodynamic model to calculate chloride molten salts liquid-gas phase diagrams; (b) analysis the micro structure evolvement for illuminating the liquid-gas phase transformation of chloride molten salts; (c) study the effect of impurity in mineral salts on thermal stability of the materials. .Based on the chloride complex characteristics, the thermodynamic model of excess free energy will be established, the liquid-gas phase diagram of chlorides will be calculated and the gasification temperature will be forcasted. The radial distribution function of the components in chloride molten salts will be measured, then the microstructure evolution and the abrupt variety will be comprehended, the microcosmic essence of liquid-gas phase transformation will be revealed. The effect of impurity in molten salts on the thermal stability will be experimentally studied, and the maximum allowable amount of impurity in molten salt materials will be determined. The proposed work will provide theoretical support for increasing stability of molten salts materials, and bring innovate research prodution for the utilizition of the tailings derived from saline lake.

英文关键词： MgCl2;Molten Salts Materials;Stability;liquid-gas phase equipment;microstructure