Selectivity of glauconite at sorption of metal cations from water solutions in dynamic conditions
Abstract
The selectivity of sorption on 95% glauconite concentrate at room temperature under dynamic con-ditions with respect to solutions of cation mixtures in two experimental series was studied. In each series, sorption was carried out from a single-component salt solution with the cation under study and a multicom-ponent system in the presence of salts of all cations under study at the same concentrations simultaneously.
In the first series, 0.1 mM sulphate solution of salts of cations (II) of metals of the iron group was used. In the second series, the Ca (II) and Mg (II) cations are 0.125 and 1.56×10-2 mmol/dm3 Cu (II). In the latter case, the concentration of Cu (II) corresponded to the maximum permissible for waters for cultural pur-poses. The linear velocity of the solution was 0.3 and 0.5 m/h (laminar flow). The height of the sorbent layer is 0.5 and 1.5 cm.
Iron (II) cations are selectively sorbed by glauconite, which is proved by the identity of the sorption parameters (the sorption coefficient dependence in time and the dynamic capacity of the sorbent in different periods of the process) from single- and three-component solutions. Co (II) cations are sorbed only on free adsorption centers (AC) in the absence of Fe (II) and Ni (II) cations. They can act as exchange cations with the introduction of Fe (II) and Ni (II) ions. Cu (II) cations are sorbed selectively at certain AC in the presence of repeatedly (8 times) exceeding concentrations of Ca (II) and Mg (II) cations. The presence of Cu (II) ions, in turn, does not affect the sorption capacity of hardness cations.
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