Abstract: Carbonation of lithium carbonate under high gravity by orthogonal method was carried out by adjusting four experimental factors, i.e. concentration, gas flow rate, frequency of rotating packed bed and the feeding rate in the rotating packed bed. The optimal condition was determined:material concentration 60 g/L, gas flow rate 0.08m³/h, the frequency of rotating packed bed 50 Hz, and the feed rate 350 mL/min. Experiments were conducted under the optimal condition, the average value of reaction time t_x is 55 min, which is about 1/3 of the traditional reactor carbonization time; the average value of c_x(Li⁺) is 9.308g/L, increased by 12.78% than the traditional reactor; and the results are highly reproducible. The experiments show that High gravity carbonation can significantly increase the mass transfer rate, shorten the reaction time, improve the utilization rate of material and gas, strengthen the reaction process, and increase the concentration of product.

Key words: rotating packed bed, high gravity, lithium carbonate, lithium bicarbonate, carbon dioxide

摘要： 采用旋转填料床进行碳酸锂超重力碳化反应,并通过调节物料浓度、气体流量、旋转填料床频率以及进料速率4个实验因素进行正交实验。确定了最佳工艺条件为:物料浓度60 g/L,气体流量0.08 m³/h,旋转填料床频率50 Hz,进料速率350 mL/min。在最优工艺条件下进行实验,反应时间t_x平均值为55 min,约为传统反应器碳化时间的1/3;所得c_x (Li⁺)平均值为 9.308 g/L,较传统反应器提高了12.78 %;且结果重复性较好。该实验表明,超重力碳化反应可以显著提高传质速率,缩短反应时间,提高物料和气体利用率,强化反应过程,增加产物浓度。

关键词: 旋转填料床, 超重力, 碳酸锂, 碳酸氢锂, 二氧化碳