磁性铝盐吸附剂的制备及高镁锂比盐湖卤水中提锂性能研究

通过沉淀法制备磁性铝盐吸附剂MASA,吸附剂为微米级,但有一定堆叠,铝、铁元素分布均匀。吸附剂的比饱和磁化强度为10.78emu/g,可通过磁场与卤水分离MASA,锂吸附量可达4~5mg/g,5次之内未发生明显变化,而且对卤水中锂的选择性较高,尤其对镁的分配比达到468。用饱和NaCl清洗后,清洗液中Li~+0.1g/L,Mg~(2+)296g/L,解析液中Li+0.175g/L,Mg~(2+)0.15g/L。

Preparation of Magnetic Aluminum Salt Adsorbent and Extraction Performance of Lithium from Saline Lake Brine with High Magnesium Lithium Ratio

Magnetic aluminum salt adsorbent (MASA) was prepared by precipitation method. Particle size of MASA is in micrometer scale with a certain stacking. Distribution of Al and Fe in MASA is uniform, and lithium content rises obviously after adsorption. Specific saturation magnetization of adsorbent is 10.78 emu/g. Lithium adsorption capacity is 4~5 mg/g with no obvious change within 5 times. Selectivity of lithium in brine is higher, and distribution of magnesium ratio is 468. After washed with saturated NaCl, concentration of Li and Mg2 in cleaning solution is 0.1 g/L and 296 g/L respectively, and concentration of Li and Mg2 in desorbed solution is 0.175 g/L and 0.15 g/L.