(中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙410083)
摘 要: 采用了懸浮聚合造粒法，以聚苯乙烯和Li1.6Mn1.6O4粉體為原料制備球形鋰離子篩前驅(qū)體，經(jīng)0.5 mol/L的HCl解析脫鋰，得到球形鋰離子篩。并利用X射線衍射、掃描電子顯微鏡、原子吸收分光光度計(jì)等測(cè)試手段對(duì)樣品的晶體結(jié)構(gòu)、形貌、吸附性能等進(jìn)行表征。吸附-解析實(shí)驗(yàn)結(jié)果表明，球形離子篩前驅(qū)體在HCl中處理2 h后解析基本完成。球形鋰離子篩對(duì)Li+的吸附速率比較快，在含鋰溶液中吸附3 h基本達(dá)到平衡。升高溫度有利于離子篩對(duì)Li+的吸附，在pH 12.57、溫度70 ℃下，離子篩的平衡吸附量為24 mg/g。吸附過(guò)程符合Langmuir吸附等溫方程和動(dòng)力學(xué)二級(jí)模型，是單分子層化學(xué)吸附。球形鋰離子篩對(duì)鹽湖鹵水中的鋰具有良好的吸附和選擇性以及良好的循環(huán)吸附性能，在鹵水中經(jīng)過(guò)10次循環(huán)吸附后，吸附量仍有9.2 mg/g，Mn的總?cè)軗p率只有1.92%。
關(guān)鍵字: 鋰離子篩；Li1.6Mn1.6O4；造粒；吸附；動(dòng)力學(xué)；鹵水
（School of Metallurgical and Environment, Central South University, Changsha 410083, China）
Abstract:A spherical lithium ion sieve precursor was synthesized by suspension polymerization using polystyrene resin and Li1.6Mn1.6O4 powder, and converted into a lithium ion sieve by leaching in 0.5 mol/L HCl solution. The crystal structure, morphology and adsorption capacity of the products were investigated by X-ray diffractometry, scanning electron microscopy and atomic absorption spectrophotometry. The desorption process was basically completed at 2 h. The adsorption rate of Li+ by the spherical lithium ion sieve is fast. The adsorption capacity of the ion sieve reaches to equilibrium value after adsorption for 3 h. Increasing temperature is beneficial to the adsorption of Li+ on the lithium ion sieve. The equilibrium adsorption capacity of the lithium ion sieve is 24 mg/g at pH 12.57 and 70 ℃. The adsorption process conforms to Langmuir adsorption isotherm equation and pseudo-second-order adsorption kinetics model, which is the monolayer chemical adsorption. After 10 cycles of adsorption in brine, the adsorption capacity is 9.2 mg/g, and the total loss rate of dissolved Mn is only 1.92%.
Key words: lithium ion sieve; Li1.6Mn1.6O4; granulation; adsorption; dynamics; brine
