摘要
以硫酸铝和尿素水热均相沉淀合成的低密度一水软铝石为晶种,研究分解条件对溶液分解率和分解产物性质的影响,还对从铝酸钠溶液析出低密度一水软铝石的过程进行了初步分析。结果表明:适当延长分解时间,降低分解温度,或采用Al2O3浓度和分子比较低的铝酸钠原液都可以得到较高的分解率;该晶种具有较好的水热稳定性,连续使用3次对溶液分解率、分解产物的堆密度和比表面积影响不大。推荐工艺条件为:分子比1.30～1.45、Al2O3浓度为140g/L左右的铝酸钠溶液在种子比1.0和180℃左右下分解3h。
Effect of decomposition conditions on the ratio of seeded decomposition and properties of precipitation products from sodium aluminate （SA） solutions with the very light boehmite seed prepared from the hydrothermal homogeneous precipitation between aluminum sulfate and urea, was studied. Mechanism of the very light boehmite precipitation process was also analyzed. The results show that with the appropriate increase of precipitation time and decrease of temperature, the initial alumina concentration and molar ratio of Na2O/Al2O3 （MR） can obtain higher ratio of seeded decomposition. The seed has better hydrothermal stability. Ratio of seeded decomposition, tape density and specific surface area of the product almost keep constant after three precipitation cycles. Process conditions are recommended as follows： the SA solutions with MR of 1.30-1.45 and alumina concentration about 140 g/L are decomposed for 3 h at approximate 180 ℃ with a low seed ratio of 1.0.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2007年第2期336-340,共5页
The Chinese Journal of Nonferrous Metals
基金
武汉理工大学博士科研启动费资助项目(471-38650016)
关键词
水热均相沉淀
铝酸钠溶液
水热种分
低密度-水软铝石
hydrothermal homogeneous precipitation
sodium aluminate solution
hydrothermal seed precipitation
very light boehmite
