The composite sorbent, including an active inorganic component （alumosilicates derived from clay-salt slimes） in the quantity of more than 80 mas.% and the polymer binder （polyacrylamide） was obtained. The influen...The composite sorbent, including an active inorganic component （alumosilicates derived from clay-salt slimes） in the quantity of more than 80 mas.% and the polymer binder （polyacrylamide） was obtained. The influences of various factors on its sorption and mechanical properties were studied. It is established that the content of polyacrylamide in the composite sorbent should be in the range of 10-15 mas.%. It is shown that quasi-equilibrium of ^137Cs in the system ＂sorbent-solution＂ is reached within 80 rain. The distribution coefficient （Kd） is 2.4× 10^4 cm^3/g. The obtained data of kinetic parameters （diffusion coefficient and sorption during half-time） show that the received sorbent can be referred to sorbents with high rate of ^137Cs sorption.展开更多
Concretes on the basis of the alumosilicate polymer can be prepared by alkali activation （NaOH, sodium water glass） of waste brown coal fly ash. The preparation is possible： （1） by using a short-term heating of t...Concretes on the basis of the alumosilicate polymer can be prepared by alkali activation （NaOH, sodium water glass） of waste brown coal fly ash. The preparation is possible： （1） by using a short-term heating of the concrete mix （to 80 ℃）; or （2） by allowing the mix to harden spontaneously at a temperature of 20 ℃. The concretes prepared by short-time heating attain high strength values after their preparation; the values are comparable to those characterizing concretes obtained on the basis of Portland cement. The strength development of concretes hardening at 20 ℃ is substantially less steep but, nevertheless, the strength attained after about 60 days is practically identical with that of the concretes exposed to a short-time heating. The shrinkage of concretes prepared by short-time heating is very small as compared with the concretes allowed to harden spontaneously; the shrinkage of latter concretes is larger than that of the concretes on the basis of Portland cement. The concretes on the basis of alumosilicate polymer exhibit much better resistance to the corrosive action of the environment as compared with those prepared on the basis of Portland cement.展开更多
文摘The composite sorbent, including an active inorganic component （alumosilicates derived from clay-salt slimes） in the quantity of more than 80 mas.% and the polymer binder （polyacrylamide） was obtained. The influences of various factors on its sorption and mechanical properties were studied. It is established that the content of polyacrylamide in the composite sorbent should be in the range of 10-15 mas.%. It is shown that quasi-equilibrium of ^137Cs in the system ＂sorbent-solution＂ is reached within 80 rain. The distribution coefficient （Kd） is 2.4× 10^4 cm^3/g. The obtained data of kinetic parameters （diffusion coefficient and sorption during half-time） show that the received sorbent can be referred to sorbents with high rate of ^137Cs sorption.
基金This study was part of the research project CEZ：MSM 6046137302： ＂Preparation and research of functional materials and material technologies using micro-and nanoscopic methods＂ and Czech Science Foundation Grant 103/08/1639 ＂Microstructure of inorganic alumosilicate polymers＂.
文摘Concretes on the basis of the alumosilicate polymer can be prepared by alkali activation （NaOH, sodium water glass） of waste brown coal fly ash. The preparation is possible： （1） by using a short-term heating of the concrete mix （to 80 ℃）; or （2） by allowing the mix to harden spontaneously at a temperature of 20 ℃. The concretes prepared by short-time heating attain high strength values after their preparation; the values are comparable to those characterizing concretes obtained on the basis of Portland cement. The strength development of concretes hardening at 20 ℃ is substantially less steep but, nevertheless, the strength attained after about 60 days is practically identical with that of the concretes exposed to a short-time heating. The shrinkage of concretes prepared by short-time heating is very small as compared with the concretes allowed to harden spontaneously; the shrinkage of latter concretes is larger than that of the concretes on the basis of Portland cement. The concretes on the basis of alumosilicate polymer exhibit much better resistance to the corrosive action of the environment as compared with those prepared on the basis of Portland cement.
