Ferromagnetic ion-exchanger can be used for removal of heavy metals and radionuclides from soils, silts and highly turbid solution. The properties of ferromagnetic ion exchanger allow to carry out de-contamination of water in batch mode.

Sorbent is prepared on the basis of natural zeolite material clinoptilolite-bearing tuffs. It is characterized by ion-exchange properties and considerable magnetic susceptibility.

The prepared sorbent has improved mechanical properties as compared to initial materials.

The solutions of salts FeS0₄ and FeCl₃ are poured into the flask in the molar ratio of 1 to 2. The mixture is heated to 80-90^oС, then the 17-20% solution of NaOH or NH₄OH is added in excess and the mixture is stirred. The black precipitate of magnetic is formed. The natural zeolite-cloniptilolite is added and the mixture is heated to boiling and is hold at this temperature during 1,0 - 1,5 hours, then cooled. The excess of magnetic removed by decanting or by sieving. The sorbent obtained is easily separated from nonmagnetic impurities with magnet.

• Patent RF № 2081846.

Institute can provide the following on commercial basis:

1. specimens of sorbent for on-the-spot inspection;
2. instructing personnel for using the sorbent;
3. combined organization of commercial production;
4. joint use of sorbent for decontamination of soils, silts and highly turbid solutions.

Authors: I.B. Serova, V.A. Nikaschina, B.A. Rudenko.

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