RADIOACTIVE WASTES
TREATMENT
Cleaning of radioactive liquids

NIKET

sorbent for the removal of cesium and cobalt radionuclides from neutral and alkaline solutions

Description
Sorbent NIKET is an inorganic sorbent based on nickel ferrocyanide. Available in two versions: NIKET and NIKET-K (composite). NIKET-K is a microparticle nickel ferrocyanide, chemically fixed on the granules of natural aluminosilicate (opal).

Nickel ferrocyanide selectively removes from aqueous solutions of cesium ions, cobalt and thallium. The presence of sodium and potassium ions in the solution does not reduce the capacity of the sorbent for cesium.

Standard characteristics

Modification of sorbent

NIKET

NIKET-K

Extracts

Cs

Cs

Salt concentrations

Up to 500 g/dm3

Up to 500 g/dm3

​Based on

​Nickel Ferrocyanide

​Nickel Ferrocyanide

​Inorganic

​Yes

​Yes

​Stable

​Yes

​Yes

Carrier

None

Aluminosilicate

Form

Powder

​Solid granules

​Bulk density, kg/l

0.9

0.6

​Grain size, mm

less 0.3

0.3-1.7

Decontamination factor

2000-6000, up to millions

2000-6000, up to millions

​Capacity typically (BV)

-

60 000 - 300 000

​Capacity typically (l/kg)

20 000 - 500 000

120 000 - 500 000

​Operating pH area

2-13

2-13

​Max. operating temperature (°C)

100

80

Service flow rate typically (BV/h)​

​-

​10-20

Technical features

Removal of cesium radionuclides under static conditions (addition of sorbent into the solution, followed by stirring and separation) NIKET recommended in an amount of 0.3% - 1% by volume of the cleaning solution. If contact time is not less than 2 hours, the recovery rate of ions not less than 99%.

In a dynamic mode, it is recommended to use NIKET-K by filtering solution with the speed of 10 column volumes per hour at an altitude of sorbent bed at least 30 cm. The optimum ratio of height to diameter of the sorbent layer column is 2.5 – 3.5.