(昆明理工大学 冶金与能源工程学院，冶金节能减排教育部工程研究中心，昆明 650093)
摘 要: 针对硅镁镍矿含水量大的特点，进行硅镁镍矿高温干燥实验和低温干燥实验，绘制干燥特征曲线，研究硅镁镍矿的干燥机制及相变特征。结果表明：硅镁镍矿中水分的存在形式分为吸附水、结晶水和结构水；硅镁镍矿的低温干燥过程可分为升速干燥阶段和减速干燥阶段，硅镁镍矿湿基含水量降到平衡水分时，干燥过程结束，干燥过程的活化能为1.7 kJ/mol；硅镁镍矿高温干燥实验的最佳干燥时间为30 min，高温干燥后硅镁镍矿变成了不定型硅酸镁；当温度达到750 ℃时， 硅镁镍矿重新结晶形成(Mg,Fe)SiO4和Fe2O3。
关键字: 硅镁镍矿；干燥曲线；作用机制；相变特征
（Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:According to characteristics of large moisture content for garnierite, the high temperature and low temperature drying experiments for garnierite were completed, drying characteristics curves were drawn, the drying mechanism and phase transformation characteristics of garnierite were investigated. The results show that the existing forms of water from garnierite include adsorbed water, crystal water and structural water. The low temperature drying process of garnierite is divided into two stages, which are rising rate stage and reducing rate stage. The drying process is achieved when the wet basis moisture content of garnierite reaches the equilibrium moisture content, and the activation energy of drying process is 1.7 kJ/mol; the optimum drying time for high temperature experiment is 30 min, the unshaped magnesium silicate is formed after high temperature drying, (Mg,Fe)SiO4 and Fe2O3 are formed renewedly in garnierite at 750 ℃.
Key words: garnierite; drying curves; action mechanism; phase transformation characteristics
