(中南大學 冶金科學與工程學院, 長沙 410083)
摘 要: 對水化石榴石與碳酸鈉溶液反應(yīng)進行了熱力學分析，研究了碳酸鈉濃度、 反應(yīng)時間、 反應(yīng)溫度、 球磨對水化石榴石中氧化鋁溶出率的影響。 結(jié)果表明： 鈉硅渣脫堿后形成的水化石榴石能被碳酸鈉分解， 且在分解過程中易于生成6CaO·6SiO2·H2O和2CaO·SiO2·0.5H2O； 碳酸鈉濃度的增大、 反應(yīng)時間的延長、反應(yīng)溫度的提高都有利于提高氧化鋁的回收率； 同時球磨處理水化石榴石也可以提高其回收率。 實驗的最佳工藝條件為： 碳堿濃度大于180g/L， 反應(yīng)溫度180℃左右， 液固比5， 反應(yīng)時間1h。
關(guān)鍵字: 鈉硅渣； 水化石榴石； 碳酸鈉； 氧化鋁回收
ZHOU Qiu-sheng, LIU Xiang-min, LI Xiao-bin
（College of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China ）
Abstract: The alumina recovery from the hydrate garnet after the alkali recovery from sodium hydrate alumino-silicate was studied. The thermodynamic analysis of the reaction between hydrate garnet and sodium carbonate indicates that the hydrate garnet can be decomposed in soda solution, and 6CaO·6SiO2·H2O and 2CaO·SiO2·0.5H2O are easy to form. The experimental results show that the alumina recovery ratio is favored with the increase of soda concentration, reaction time and temperature, meanwhile the grinding can also increase the alumina recovery ratio. The optimum technique conditions are Na2OC concentration >180g/L, reaction temperature about 180℃, L/S 5 and reaction time 1h.
Key words: sodium hydrate alumino-silicate; hydrate garnet; sodium carbonate; alumina recovery
