钠硅渣中的氧化铝回收工艺  

Alumina recovery from sodium hydrate alumino-silicate

作　　者：刘桂华[1] 张亚莉[1] 彭志宏[1] 周秋生[1] 刘祥民[1] 李小斌[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2004年第3期499-503,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50274076)

摘　　要：对水化石榴石与碳酸钠溶液反应进行了热力学分析,研究了碳酸钠浓度、反应时间、反应温度、球磨对水化石榴石中氧化铝溶出率的影响。结果表明:钠硅渣脱碱后形成的水化石榴石能被碳酸钠分解,且在分解过程中易于生成6CaO·6SiO2·H2O和2CaO·SiO2·0.5H2O;碳酸钠浓度的增大、反应时间的延长、反应温度的提高都有利于提高氧化铝的回收率;同时球磨处理水化石榴石也可以提高其回收率。实验的最佳工艺条件为:碳碱浓度大于180g/L,反应温度180℃左右,液固比5,反应时间1h。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·6SiO_2·H_2O and 2CaO·SiO_2·(0.5H_2O) 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 Na_2O_C concentration >180 g/L, reaction temperature about 180 ℃, L/S 5 and reaction time 1 h.

关 键 词：钠硅渣 水化石榴石 碳酸钠 氧化铝 回收 热力学 

分 类 号：TF821[冶金工程—有色金属冶金]