(東北大學 材料與冶金學院，沈陽 110819)
摘 要: 以分析純化學試劑CaO、Al2O3、SiO2和B2O3為原料，研究添加不同B2O3含量的CaO-Al2O3-SiO2三元系在1350℃燒結(jié)時鋁酸鈣熟料的自粉性能、物相形成規(guī)律、微觀組織形貌及其元素分布和Al2O3的浸出性能，并通過XRF、XRD和SEM-EDS等手段探討其作用機理。結(jié)果表明：B2O3促進2CaO·Al2O3·SiO2的生成，并抑制β-2CaO·SiO2向γ-2CaO·SiO2的轉(zhuǎn)變，明顯降低熟料的自粉性能；B2O3在鋁酸鈣熟料中均勻分布，其加入使鋁酸鈣熟料中12CaO·7Al2O3和CaO·Al2O3的晶胞參數(shù)增加，固溶至鋁酸鈣晶體中引起晶胞的擴脹；鋁酸鈣熟料的Al2O3浸出率隨著B2O3含量的增加急劇下降，當B2O3添加量由0增加到0.20%(質(zhì)量分數(shù))時，Al2O3浸出率由95.01%降低至72.03%，添加B2O3后鋁酸鈣熟料中生成的2CaO·Al2O3·SiO2和難以浸出的12CaO·7Al2O3是其Al2O3浸出率明顯降低的主要原因。
關鍵字: CaO-SiO2-Al2O3三元系；B2O3；鋁酸鈣；物相組成；浸出
（School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China）
Abstract:Calcium aluminate clinkers containing different contents of B2O3 in CaO-Al2O3-SiO2 system sintered at 1350 ℃ were obtained by using analytical reagents of CaO, Al2O3, SiO2 and B2O3 as raw materials. The pulverization, mineralogical formation characteristic, microstructure, elemental distribution and alumina leaching property of clinkers were studied by XRF, XRD and SEM-EDS. The results show that B2O3 promotes the formation of 2CaO·Al2O3·SiO2 and inhibits the conversion of β-2CaO·SiO2 to γ-2CaO·SiO2, which deteriorates the pulverization property of calcium aluminate clinker. B2O3 distributes uniformly in the calcium aluminate clinker, and the crystal parameters of 12CaO·7Al2O3 and CaO·Al2O3 increase with the increase of B2O3 addition, indicating that B2O3 forms solid solutions in calcium aluminates to increase their crystal cell parameters. The Al2O3 leaching rate of calcium aluminate clinkers decreases quickly with the increasing of B2O3 addition, which decreases from 95.01% to 72.03% as the B2O3 addition increases from 0 to 0.20% (mass fraction). The main reason of the obvious decrease in the Al2O3 leaching rate of calcium aluminate clinker is the formation of 2CaO·Al2O3·SiO2 and the unleached 12CaO·7Al2O3 in sodium carbonate solution.
Key words: CaO-Al2O3-SiO2 ternary system; B2O3; calcium aluminate; phase composition; leaching
