(昆明理工大學(xué) 冶金與能源工程學(xué)院，冶金節(jié)能減排教育部工程研究中心，昆明 650093)
摘 要: 針對(duì)硅鎂鎳礦含水量大的特點(diǎn)，進(jìn)行硅鎂鎳礦高溫干燥實(shí)驗(yàn)和低溫干燥實(shí)驗(yàn)，繪制干燥特征曲線，研究硅鎂鎳礦的干燥機(jī)制及相變特征。結(jié)果表明：硅鎂鎳礦中水分的存在形式分為吸附水、結(jié)晶水和結(jié)構(gòu)水；硅鎂鎳礦的低溫干燥過(guò)程可分為升速干燥階段和減速干燥階段，硅鎂鎳礦濕基含水量降到平衡水分時(shí)，干燥過(guò)程結(jié)束，干燥過(guò)程的活化能為1.7 kJ/mol；硅鎂鎳礦高溫干燥實(shí)驗(yàn)的最佳干燥時(shí)間為30 min，高溫干燥后硅鎂鎳礦變成了不定型硅酸鎂；當(dāng)溫度達(dá)到750 ℃時(shí)， 硅鎂鎳礦重新結(jié)晶形成(Mg,Fe)SiO4和Fe2O3。
關(guān)鍵字: 硅鎂鎳礦；干燥曲線；作用機(jī)制；相變特征
（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
