铝酸钠溶液种分过程降温制度的研究

研究了铝酸钠溶液晶种分解过程中的相对过饱和度、分解率、产品粒度分布和反应速率常数在不同温度下的变化情况。结果表明,在50~75℃,铝酸钠溶液的相对过饱和度随温度的升高而逐渐减小,产品的平均粒度和反应速率常数随温度升高而增大,铝酸钠溶液种分分解率在65℃时达到最大。在降温制度下,铝酸钠溶液种分的分解率为28.86%,仅略低于65℃时的分解率,而产品粒度大于65℃时的产品粒度,降温制度下的铝酸钠溶液种分既能保证分解率又能提高产品氢氧化铝的粒度。

Study of Decreasing Temperature on Seed Precipitation of Sodium Aluminate Solution

The changes of the relative supersaturation,precipitation ratio,the product particle size distribution and reaction rate constant of the seed precipitation of the sodium aluminate solution under the different temperatures have been investigated.The results show that from 50℃ to 75℃ relative supersaturation of the sodium aluminate solution decreases with temperature gradual increases,average particle size and reaction rate constant increase with the gradual increases of temperature,aluminum sodium precipitation ratio reaches the maximum at 65℃.In addition,the sodium aluminate solution of precipitation ratio is 28.86% at temperature decrease system,however,only slightly lower than the one at 65℃,the product particle size at this condition is larger than the one at 65℃.Seed precipitation at temperature decrease system not only ensures larger seed precipitation ratio,but also improves the product particle size.