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.
关键词
离子交换树脂/锂离子回收/静态吸附量/动态吸附量/解吸
Key words
ion exchange resin/lithium ions recovery/static adsorption capacity/dynamic adsorption ca-pacity/desorption
维普
万方数据