MICROSPHERIC SORBENT FOR TREATMENT OF LIQUID WASTE FROM RADIONUCLIDES, NONFERROUS AND HEAVY METAL IONS AND METHOD FOR ITS PREPARING Russian patent published in 2003 - IPC

FIELD: sorbents, chemical technology. SUBSTANCE: invention relates to zeolites prepared from technogenic alumosilicate raw, in part, from components of fly ashes of heating and power plants. For synthesis of microspheric sorbent zenospheres isolated from fly ashes after combustion of coal are used. Preliminary, the composition of zenospheres is stabilized by their separation by size, density and magnetic properties. Zenospheres are mixed with NaOH solution with concentration 1-3 M and kept at 80-100 C for 32-72 h under static conditions or at stirring. Sorbent comprises one or some zeolits of type NaX, NaA or NaP1 that can be placed both on external and internal surface of microspheric hollow carrier with diameter up to 400 mcm. Exchange capacity of the prepared sorbent with respect to cesium and strontium is 2 mg-eq/g of sorbent and for Ni, Cu, Cr, Co, Cd, Hg and Zn- about 1 mg-eq/g. Invention can be used in nuclear power engineering and chemical-metallurgy industry in treatment of liquid radioactive waste and sewage from radionuclides and ions of nonferrous and heavy metals. EFFECT: improved preparing method, valuable properties of sorbent. 8 cl, 2 dwg, 3 tbl