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Study on dynamic adsorption of Mn 2+ from phosphoric acid by ion exchange technology
Received date: 2020-07-18
Online published: 2021-01-08
In recent years,ion exchange technology has been widely developed and applied in the purification of wet-process phosphoric acid.Sinco-430 cation exchange resin was used to remove manganese ions from phosphoric acid.The effects of in-flow rate,initial manganese concentration of phosphoric acid solution and temperature on the adsorption performance were investigated.The results showed that increasing inflow rate,initial manganese concentration and temperature were all con-ducive to shortening the saturation time of resin.However,the increase of inflow rate will reduce the adsorption rate of resin,and the increase of temperature will reduce the saturated adsorption capacity of resin.Under the conditions that the inflow rate was 4.0 mL/min,the initial manganese mass concentration of solution was 10.22 mg/mL and the temperature was 35 ℃,the saturated adsorption capacity of the resin for manganese ions was 64.76 mg/g,and the adsorption efficiency was 63.55%.Thomas,Yoon-Nelson and Yan dynamic adsorption model were used to fit the experimental data of dynamic adsorption pro-cess.It was found that the Yan model fitted best,and the relative deviation between the saturated adsorption capacity calcu-lated by the Yan model and the experimental value was 6.93%~10.91%.
Key words： ion exchange; manganese ion; phosphoric acid; dynamic adsorption; model fitting
Haibo Zhuang , Lin Yang , Qiang Deng , Runzhou Ye , Zhaomin Wu . Study on dynamic adsorption of Mn 2+ from phosphoric acid by ion exchange technology[J]. Inorganic Chemicals Industry, 2021 , 53(1) : 18 -23 . DOI: 10.11962/1006-4990.2020-0096
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