β—锂辉石硫酸钠压煮过程数学模型

本文研究了在氢氧化钙介质中从β-锂辉石提取锂的硫酸钠压煮过程。在温度220—260℃,浸出时间120—240min,硫酸钠配比2.0—5.0及氢氧化钙浓度1.0—3.0g/L的范围内,用饱和近似D-最优设计方法建立了四元二次回归模型,应用计算机进行参数估计、回归值及其方差的计算。该数模经实验验证其可靠性较好。研究结果表明,温度是最主要的影响因素,高的硫酸钠配比是锂有效溶出的必要条件。在适当的条件下锂的浸出率可达96％以上,为从锂辉石中提锂提供了一种新的有效方法。

REGRESSIVE MODEL OF PRESSURE LEACHING OF BETA-SPODUMENE BY SODIUM SULFATE

A Pressure leaching technology for recovery of lithium from beta- spodumene using sodium sulfate as reactant in the medium of calcium hydroxide is in- vestigated. A quadratic regressive model with the leaching rate of lithium and the four factors (temperature, reaction time, percentage of stoichiometric Na_2SO~4 and concentration of calcium hydroxide) has been established by means of a saturated approximate D- optimum design method. The regressive values and their square deviations are calculated. The regressive model proves to be reliable to a great extent in experiments. Some information about the technology is obtained from the regressive model. Tem- perature is the primary factor; larger percentage of stoichiometric Na_2SO~4 is necessary for lithium's complete dissolution; under some proper conditions the leaching rate of lithium can be up to 96%. This new technology is effective and applicable.