(東北大學 資源與土木工程學院，沈陽 110819)
摘 要: 依據廣泛應用的同族化合物線性遞變規(guī)律，通過擬合鈣、鎂化合物生成反應標準吉布斯自由能之間的線性關系，由不同溫度條件下Ca3(BO3)2和Ca2B2O5生成反應的標準吉布斯自由能求得相應溫度條件下Mg3(BO3)2和Mg2B2O5生成反應的標準吉布斯自由能，進而基于化學反應的標準吉布斯自由能與溫度之間的近似線性關系，推導Mg3(BO3)2和Mg2B2O5生成反應標準吉布斯自由能，并通過試驗進行了驗證與探討。熱力學計算及XRD物相分析結果表明：在還原焙燒過程中，含硼鐵精礦中的硼鎂石(Mg2[B2O4(OH)](OH))分解為遂安石(Mg2B2O5)，遂安石進一步與蛇紋石的分解產物鎂橄欖石或頑火輝石反應最終轉變成小藤石(Mg3(BO3)2)。
關鍵字: 含硼鐵精礦；同族線性規(guī)律；還原焙燒；物相演變
（College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China）
Abstract:According to the homologous linear rule applied widely in the chemistry area, the linear equation between the formation reaction Gibbs free energy of calcium and magnesium composite compounds was fitted out. The formation reaction Gibbs free energies of Mg3(BO3)2 and Mg2B2O5 are obtained from the formation reaction of Ca3(BO3)2 and Ca2B2O5 at different temperatures. Then, the thermodynamic calculation models for the formation reaction of Mg3(BO3)2 and Mg2B2O5 were deduced based on the approximate linear rule between the reaction Gibbs free energy and temperature, and it was verified by the laboratory tests. The results of thermodynamic calculation and XRD phase identification indicate that ascharite in the iron concentrate will be transformed into suanite firstly, and then into kotoite by reacting with the serpentine decomposition product of serpentine during the roasting process.
Key words: boron-bearing iron concentrate; homologous linear rule; reduction roasting; phase evolution
