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离子交换树脂回收废水中锂离子的试验研究

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为了研究离子交换树脂回收废水中锂离子的工艺参数,使用4 种大孔离子交换树脂(HYC-100、D401、D500、LI500),在锂离子质量浓度为 1 600 mg/L,流速为 6 mL/min条件下动态吸附某新能源电池企业生产废水中的锂离子,筛选出锂离子去除效果最佳的HYC-100 树脂.采用HYC-100 树脂在不同pH值、不同吸附流速及两级吸附条件下开展静态吸附及动态吸附试验,并考察了盐酸解吸液浓度对解吸效果的影响.结果表明:在树脂质量为 10.00 g,锂离子质量浓度为 1 600 mg/L,吸附时间为 2h的条件下,静态吸附最佳pH值为 10,静态吸附量为 22.4 mg/g.优选最佳pH值为 10,不同流速下动态吸附,最佳吸附流速为 6 mL/min.在最佳吸附流速为 6 mL/min,最佳pH值为 10 的条件下,动态吸附量达到6.46 mg/g.在上述最佳条件下一级吸附混合液进入二级吸附,得到每一级树脂吸附总量与废水中锂离子含量成正比.吸附饱和后的树脂使用不同浓度盐酸在 2 mL/min流速下解吸,最佳盐酸解吸液浓度为 2.5 mol/L,对锂离子的解吸及浓缩效果最好,浓缩倍数为2.7 倍.
Experimental study on recovery of lithium ions in wastewater using ion exchange resin
In order to study the process parameters of ion exchange resin recycling lithium ions in wastew-ater,four kinds of large-hole ion exchange resin(HYC-100,D401,D500,LI500)were used to dynamically ad-sorb lithium ions in the wastewater of a new energy bacttery enterprise under the condition of lithium ion mass concentration of 1 600 mg/L,flow rate of 6 mL/min,and HYC-100 resin with the best lithium ions-removing ef-fect was screened.Static adsorption test and dynamic adsorption test using HYC-100 resin under different pH values,different adsorption flow rate and secondary adsorption conditions,were carried out,the influence of hy-drochloric acid stripping liquid concentration on desorption effect was investigated.The results showed that,un-der the condition that the resin dosage was 10.00 g,the mass concentration of lithium ions was 1 600 mg/L,the adsorption time was 2 h,the optimal pH value for static adsorption was 10,and the static adsorption capacity was 22.4 mg/g.Therefore,dynamic adsorption under 10 of pH value and 6 mL/min of flow rate was finally selected,which obtained 6.46 mg/g of adsorption capacity.Under the above optimal condition,the primary adsorption mix-ture enters the secondary adsorption,and the total adsorption capacity of each primary resin was proportional to the lithium ions content in the wastewater.After adsorption saturation,desorption by the said resin using hydrochlo-ric acid with different concentrations at flow rate of 2 mL/min was carried out,the optimal hydrochloric acid strip-ping liquid concentration was 2.5 mol/L,the best desorption and concentration effect on lithium ions were obtained,the concentration multiple was 2.7 times.

ion exchange resinlithium ions recoverystatic adsorption capacitydynamic adsorption ca-pacitydesorption

李橙、赵曙光、宋乐山、张颖、许大勇

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深圳永清水务有限责任公司,长沙 410329

离子交换树脂 锂离子回收 静态吸附量 动态吸附量 解吸

湖南省科技创新重大项目永清研发基金项目

2021GK1010YQ020821002

2024

工业用水与废水
东化工程科技股份有限公司

工业用水与废水

CSTPCD
影响因子:0.649
ISSN:1009-2455
年,卷(期):2024.55(1)
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