Selective Removal of Nickel Ions from Desulphurization Tailing of Pyrolusite by Spongy Nickel-imprinted Chitosan Adsorbent
In order to selectively remove nickel ions from the desulphurization tailing of pyrolusite and improve the purity of manganese sulfate,the spongy nickel-imprinted chitosan adsorbent Ni2+-IIP was prepared by ion imprinting method and chemical foaming method on chitosan matrix,and its competition and selective adsorption behavior in simulated binary solution were discussed.The effects of temperature,adsorption time and desulphurization tailing pH on the adsorption amount and removal rate of nickel ions and the loss rate of manganese ions in the desulphurization tailing of pyrolusite were also investigated.The results show that in the simulated binary solution,Ni2+-IIP still maintains high selectivity for nickel ions,although there is competitive adsorption between manganese and nickel ions.In the actual desulphurization tailing of pyrolusite,under the conditions of pH=5.0,adsorption temperature of 40 ℃ and adsorption time of 1 440 min,the adsorption capacity and rate of removal of Ni2 is 15.3 mg/g and 90％,respectively,and the loss rate of manganese ions is about 11％.After 5 adsorption-desorption cycles,the adsorption capacity of Ni2+-IIP for nickel ions in the desulphurization tailing reduces 13.1％,and the regeneration performance is good.Ni2+-IIP can selectively remove nickel ions from the desulphurization tailing,and purify the manganese sulfate solution.
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