Patent Number: 
Section: claims

1. A method for solidification of liquid waste, said liquid waste being at least one selected from the group consisting of liquid radioactive waste and liquid hazardous non-radioactive waste, by means of incorporating said liquid waste into a porous glass crystalline molded block, comprising: providing a porous glass crystalline molded block made from cenospheres obtained from fly ash, wherein said porous glass crystalline molded block has an open-cell porosity of about 40-90 vol. %;  loading said porous glass crystalline molded block with said liquid waste;  drying the porous glass crystalline molded block loaded with said liquid waste; and  calcining the dried porous glass crystalline molded block loaded with said liquid waste. 2. The method of  claim 1  wherein said loading of said porous glass crystalline molded block with said liquid waste and said drying are repeated multiple times, and said loading is alternated with said drying. claim 1 3. The method of  claim 2  wherein said drying comprises active ventilation of said loaded porous glass crystalline molded block with dry air at room temperature, and moisture condensation from resulting saturated air. claim 2 4. The method of  claim 2  wherein said drying comprises microwave heating. claim 2 5. The method of  claim 2  wherein said drying comprises heating in an oven. claim 2 6. The method of  claim 2  further comprising coating the calcined porous glass crystalline molded block loaded with said liquid waste with a low-melting glass or a ceramic coating, after said calcining. claim 2 7. The method of  claim 2  wherein said drying is carried out at about 50-150xc2x0 C. for about 120 minutes. claim 2 8. The method of  claim 2  wherein said calcining is carried out at about 800xc2x0 C. for about 120 minutes. claim 2 9. The method of  claim 1  further comprising coating internal surfaces of said porous glass crystalline molded block with a metal oxide, prior to said loading with said waste. claim 1 10. The method of  claim 9  wherein said metal oxide is at least one selected from the group consisting of ZrO 2 , TiO 2 , Fe 2 O 3  and Al 2 O 3 . claim 9 11. The method of  claim 10  wherein said calcining is carried out at 1,000xc2x0 C. claim 10 12. The method of  claim 1  wherein said cenospheres in said porous glass crystalline molded block are non-perforated cenospheres. claim 1 13. The method of  claim 1  wherein said cenospheres in said porous glass crystalline molded block are perforated cenospheres. claim 1 14. The method of  claim 1  wherein said liquid radioactive waste comprises a first cycle raffinate resulting from reprocessing spent nuclear fuel. claim 1 15. The method of  claim 1  wherein said liquid radioactive waste is at least one selected from the group consisting of actinides and lanthanides. claim 1 16. The method of  claim 1  wherein said liquid radioactive waste is at least one selected from the group consisting of cesium, strontium, and plutonium. claim 1 17. The method of  claim 1  wherein said cenospheres in said porous glass crystalline molded block are non-magnetic. claim 1 18. The method of  claim 1  wherein said cenospheres in said porous glass crystalline molded block are magnetic. claim 1 19. The method of  claim 1  wherein said porous glass crystalline molded block comprises cenospheres of grain size xe2x88x92400+50 micrometers in diameter. claim 1 20. The method of  claim 19  wherein said porous glass crystalline molded block comprises cenospheres of xe2x88x92160+100 micrometers in diameter. claim 19 21. The method of  claim 1  wherein said porous glass crystalline molded block comprises a silicate glass binder. claim 1 22. The method of  claim 21  further comprising hot pressing the calcined porous glass crystalline molded block loaded with said liquid waste after said calcining. claim 21 23. The method of  claim 22  wherein said porous glass crystalline molded block has an open-cell porosity of 40-50 vol. % and interglobular voids of 20-60 micrometers, and said cenospheres comprise non-magnetic, non-perforated cenospheres of grain size xe2x88x92160+100 micrometers. claim 22 24. The method of  claim 21  wherein said porous glass crystalline molded block has an open-cell porosity of 60-70 vol. % and interglobular voids of 20-60 micrometers, and said cenospheres comprise non-magnetic, perforated cenospheres of grain size xe2x88x92160+100 micrometers. claim 21