TM TT LUN VN THC S ti: Nghin cu x l nc thi phng x bng vt liu bentonitTc gi lun vn: Nguyn Vn Chnh Kha: 2013BNgi hng dn: TS. Nguyn B TinTS. V c ThoNi dung tm tt:a) L do chn tiNc thi ca ngnh khai thc v ch bin khong sn c cha cc kim loi nng: ch, cadimi, crom, v c bit cn cha cc nhn phng x: urani, thori, radi, Nu khng x l t tiu chun s gy nguy hi cho mi trng lu di. V vy x l hiu qu v trit nc thi c cha cc kim loi nng v nguyn t phng x l rt cp thit.Hin nay, mt s phng php x l c nghin cu v p dng nh kt ta, trao i ion, phng php lc mng, cho thy hiu qu tuy nhin chi ph cao. Mt xu th nghin cu mi l s dng cc khong vt t nhin x l mi trng ni chung v x l nc thi ni ring. Cc vt liu ny va m bo hiu qu x l va c gi thnh thp. b) Mc ch nghin cu ca lun vn, i tng, phm vi nghin cu Mc tiu: Xem xt, nh gi kh nng s dng vt liu bentonit bin tnh x l cc nguyn t phng x c trong nc thi ca qu trnh ch bin qung urani. i tng nghin cu: + Vt liu bentonit bin tnh t bentonit Tuy Phong Bnh Thun+ Cc nguyn t phng x U(VI), Th(IV), c trong nc thi Phm vi nghin cu: Nghin cu qu trnh hp ph cc nguyn t phng x trong mi trng nc v nc thi t qu trnh ch bin qung urani trn vt liu bentonit bin tnh trong phm vi phng th nghim.c) Tm tt c ng cc ni dung chnh v ng gp mi ca tc gi Tng quan l thuyt v:+ Qung phng x v cht thi lng sinh ra trong qu trnh ch bin qung urani+ Tnh hnh nghin cu x l thi lng cha nhn phng x+ Gii thiu v bentonit v cc phng php bin tnh bentonit Nghin cu thc nghim:+ Vt liu hp ph: ch to vt liu hp ph v xc nh tnh cht vt liu+ Nghin cu cc yu t nh hng n qu trnh hp ph urani v thori trn bentonit bin tnh. + Nghin cu x l nc thi t qu trnh ch bin qung urani Vit Nam s dng bentonit bin tnh.d) Phng php nghin cuTin hnh cc th nghim theo m kho st cc thng s nh hng n qu trnh hp ph urani v thori t trong dung dch pha ch trn bentonit bin tnh. T cc s liu thu c ng dng x l nc thi t qu trnh ch bin qung phng x.e) Kt lun tin hnh nghin cu qu trnh hp ph 2 nguyn t phng x U(VI) v Th(IV) trn vt liu bentonit bin tnh trong h n ion. Cc kt qu nhn c chng t: Kh nng hp ph Th(IV) cao hn U(VI) trn bentonit iu kin (pH =6, thi gian lc 4 gi, nng ban u (1 10 mg/l), nhit phng) S hp ph cc nguyn t Th(IV) v U(VI) tun theo c 2 m hnh: ng nhit Langmuir v Freundlich. nh hng ca pH dung dch v thi gian khuy trn c nghin cu, t xc nh c pH v thi gian khuy ti u cho qu trnh hp ph. Thc nghim chng t rng, vt liu bentonit bin tnh l cht hp ph hiu qu x l nc thi sinh ra t qu trnh khai thc v ch bin qung phng x. xy dng c mt s cng ngh qui trnh x l nc thi t ch bin qung phng x trong quy m phng th nghim. Xc nhn ca c quan ngi hng dn2