响应曲面法优化碳酸锂反应结晶工艺

发布时间：2018-04-16 21:11

本文选题：反应结晶 + 整体优化　；参考：《化工学报》2017年11期

【摘要】：碳酸锂是制备各种锂化合物的基础锂盐,碳酸锂的制备是锂产业链当中的承前启后的关键技术。以察尔汗盐湖老卤为原料,采用响应曲面法中的central composite design(CCD)设计实验,分别考察了温度、碳酸钠加料速度、碳酸钠浓度和锂离子浓度4个因素及交互作用对反应结晶工艺中碳酸锂的收率和粒度的影响,并分别建立了响应值与影响因素之间的回归方程。响应预测最佳值为:碳酸锂收率93.68%、粒径(d50)16.73μm;相应的实验值分别为94.01%和16.91μm。预测值与实验值接近,误差较小,说明响应曲面法建立的预测碳酸锂反应结晶的模型可靠,在最佳工艺条件下分析所制得的产品,用ICP-AES分析纯度为99.52%,用XRD分析基本无杂峰,说明反应结晶生成Li_2CO_3晶体,其主要晶面为(-1 1 0)、(-2 2 0)和(0 0 2)。
[Abstract]:Lithium carbonate is the basic lithium salt for the preparation of various lithium compounds. The preparation of lithium carbonate is the key technology in lithium industry chain.Using the old halogen of Chaerhan Salt Lake as raw material, the central composite design experiment in response surface method was used to investigate the temperature and the feeding speed of sodium carbonate, respectively.The effects of four factors, sodium carbonate concentration and lithium ion concentration, and interaction on the yield and particle size of lithium carbonate in the reaction crystallization process were studied. The regression equations between the response value and the influencing factors were established.The optimum value of response prediction is: the yield of lithium carbonate is 93.68%, the particle size is 16.73 渭 m, and the corresponding experimental values are 94.01% and 16.91 渭 m, respectively.The predicted value is close to the experimental value and the error is small, which indicates that the model established by the response surface method for predicting the reaction crystallization of lithium carbonate is reliable. Under the optimum technological conditions, the purity of the product analyzed by ICP-AES is 99.52%, and the purity of the product is 99.52% by XRD analysis.The results show that the Li_2CO_3 crystal is formed by reaction crystallization, the main crystal faces of which are (1 10) and (2 200) and (0 02) ~ (2 +).
【作者单位】：华东理工大学国家盐湖综合利用工程技术研究中心;
【基金】：国家自然科学基金项目(51574126) 国家重点研发计划项目(2016YFC0401203) 国家科技支撑项目(2015BAB10B01)~~
【分类号】：TQ131.11

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