(1. 北京科技大學 鋼鐵冶金新技術國家重點實驗室，北京 100083；
2. 北京科技大學 期刊中心，北京 100083)
摘 要: 研究紅土鎳礦的脫水機理及還原過程動力學。結果表明，紅土鎳礦在升溫過程中主要進行自由水的脫除、針鐵礦的分解、高嶺石及蛇紋石的脫羥基反應和蛇紋石類礦物的第二段脫羥基反應；紅土鎳礦還原過程可分為3個階段，第一階段的控速環(huán)節(jié)是化學反應，預焙燒和未焙燒紅土鎳礦的活化能分別為90.21和63.12 kJ/mol；第二階段和第三階段控速環(huán)節(jié)是擴散，紅土鎳礦的活化能逐漸增大。
關鍵字: 紅土鎳礦；動力學；熱分析；直接還原
（1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2. Journals Publishing Centre, University of Science and Technology Beijing, B）
Abstract:The dehydration mechanism and reduction process dynamics of laterite nickel ore were studied. The results indicate that the dehydration of free water, the decomposition of goethite and the dehydroxylation reaction of kaolinite and serpentine as well as the second period reaction of dehydroxylation for serpentine mineral all take place in the process of heating. The reduction of laterite nickel ore consists of three stages. Chemical reaction is the controlling unit in the first stage, the activation energies of the precalcined and unroasted laterite nickel ores are 90.21 and 63.12 kJ/mol, respectively. Diffusion is the dominant link in the following two stages, in which the activation energy of laterite nickel ore gradually increases.
Key words: laterite nickel ore; dynamics; thermal analysis; direct reduction
