利用海南高岭土制备拟薄水铝石条件的研究

Preparing of Pseudoboehmite from Hainan Kaolin

以海南高岭土为原料制备拟薄水铝石,采用正交试验方法,考察了碳化成胶反应温度,NaAlO2溶液质量浓度,碳化成胶pH值,干燥时间对拟薄水铝石结晶度和晶粒尺寸的影响。结果表明,碳化成胶反应温度对拟薄水铝石的结晶度和晶粒尺寸影响最显著。为提高拟薄水铝石的结晶度和减小晶粒尺寸,优化配比方案为:碳化成胶反应温度60℃,NaAlO2溶液质量浓度50g/L,碳化成胶pH值10.5,干燥时间15 h。

Using Hainan kaolin as the main raw material to prepare pseudoboehmite, the orthogonal expeiment was carried out to study the influence of the temperature of gelation reation, the concentration of NaAlO2, the aging pH value, drying time which made great effects on the crystallinity and crystallite size of pseudoboehmite. The experimental results show that the temperature of gelation reation has the greatest impact on the crystallinity and crystallite size of pseudoboehmite. The optimum conditions of enhancing the crystallinity and reducing crystallite size are listed as follows： the temperature of gelation reaction is 60℃, the concentration of NaAIO2 is 50 g/L, the aging pH value is 10.5, the drying time is 15 h.