以PAC为原料合成锂吸附剂的工艺研究

Study on the Process of Synthesizing Lithium Adsorbent from PAC

研究了聚合氯化铝(PAC)为原料合成锂吸附剂的基本工艺路线,并探究了加料方式、反应物配比、反应温度、反应时间和加料速度等对所合成吸附剂吸附量的影响,研究结果表明配比是影响吸附剂吸附量的最主要因素,得到了最佳合成条件,在此条件下所合成吸附剂对锂离子的吸附容量为6.1 mg/g。推断吸附剂的主要成分为晶态或非晶态的LiCl·2Al(OH)3·nH2O,同时含有Al(OH)3、(CaO)3Al2O3·6H2O及LiCl·H2O等成分。从吸附结果来看,结晶度较差的片状LiCl·2Al(OH)3·nH2O和非晶态的Al(OH)3为主成分的吸附剂吸附性能最好。

The basic process route of poly aluminum chloride(PAC) as a raw material for synthesizing lithium adsorbent was studied.The effects of feed mode, reactant ratio, reaction temperature, reaction time and feed rate on the adsorption capacity of the synthesized adsorbent were investigated.The results show that the ratio is the most important factor affecting the adsorption capacity of the adsorbent, and the optimal synthesis conditions are obtained.Under this condition, the adsorption capacity of the synthesized adsorbent for lithium is 6.1 mg/g. It is inferred that the main component of the adsorbent is crystalline or amorphous LiCl·2 Al(OH)3·nH2O, and contains Al(OH)3,(CaO)3Al2O3·6 H2O and LiCl·H2O.From the adsorption results, the best adsorption performance is in the lamellar LiCl·2 Al(OH)3·nH2O and amorphous Al(OH)3 as the main component is the best.