METHOD OF DEACTIVATING ORES, ORE AND TECHNOGENIC CONCENTRATES Russian patent published in 2017 - IPC C22B60/02 C22B3/08 C22B3/20 

FIELD: chemistry.

SUBSTANCE: invention can be used in processing of ores, ore and technogenic concentrates for their deactivation from impurities of radioactive isotopes: ²³²Th, ²³⁸U, ²³⁵U, ²³⁴U, ²²⁸Th, ²³⁰Th, ²²⁴Ra, ²²⁶Ra, ²²⁸Ra. The method comprises treating the lixiviant solution to produce a pulp consisting of a solid and a liquid phase, separating by filtration of the liquid phase from the solid phase consisting of insoluble concentrate residues. Further, the extraction of radionuclides from the liquid phase is carried out. At the same time, sulfuric acid with a concentration of 20-95 wt % is used as the lixiviant at the ratio of T:H=1:(1.5-3) at the temperature of 70-300°C for 2-6 hours Selective extraction of radionuclides from the liquid phase is carried out in three stages, in the first stage by precipitation of double REE sulfates and sodium or stepwise neutralisation, in the second stage - by coprecipitation, in the third stage - by ion exchange.

EFFECT: invention allows to increase the efficiency of the deactivation process and to ensure the conditions for deactivation of all ores, ore and technogenic concentrates.

7 cl, 2 dwg, 10 tbl, 5 ex