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HOA CHi BIEN D A U KHI Nghien cCru ung dung he hoa phdm moi tren coso HEDF vd NĤ HF2 thay the he hda phdm truydn thong tren co sd HCI/HF trong xu ly acid vung cgn ddy gieng ThS D 6 ThAnh Trung, ThS H[.]
HOA - CHi BIEN D A U KHI Nghien cCru ung dung he hoa phdm moi tren coso HEDF vd NH^HF2 thay the he hda phdm truydn thong tren co sd HCI/HF xu ly acid vung cgn ddy gieng ThS D ThAnh Trung, ThS Hoing Linh Lan Vl$n Ddu khf Vlit Nam TS Nguyin VAn Ngp, KS Phan V2n Minh Trung tdm Nghiin cdu dng dung vd Djch vuky thudt fDMC-ffT) Tdm t i t Trong cdng nghiip khai thdc ddu khi, xd ly acid viing cdn ddy gidng khoan nhdm phuc hdi hodc Idm tdng ndng sudt khai thdc cua giing Id mdt nhdng blin phdp cdng nghi hdu hiiu Xdly aeid vung cdn ddy giing via edt kit bdng kiiu hi acid truyin thdng trin cdsd HCI/HF thudng gap nhliu khd khdn Thdng tin vi diiu kiin dja ehat md vd kinh nghiim xtf/y vdng can ddy giing d LUn doanh Vlit - Nga (Vietsovpetro) cho thdy, hai khd khdn chinh can quan tdm liin quan den nhiit cao vd kit tda thUcdp Do dd, hi hda phdm mdi trin cdsd HEDP vd NH/iF^ thay thihehdo phdm truyin thdng dd duge nghien cdu nhdm khde phgc nhdng khd khdn ndy Gioi thieu chung ve XIJT ly a d d viing can tfiy g i l n g Trong cdng nghidp khai thic dau khi, xd ly acid vung can day gieng khoan nhim phuc hdi hoac l i m tang nang suat khai t h i c cua gieng la mdt nhdng bien p h i p Khd k h i n thirdng gdp p h i i t r o n g xijriy acid vung d n diy gilng Thdng tin v l dieu kien dja chat md v l kinh nghiemxi^ ly vung can d i y gieng d VietsovpetnD cho thiy, hai van 3e cdng nghe hdu hieu cho phdp ning eao hieu q u i sin chlnh can quan t i m 11 khd khin lien quan tdi nhiet dd cao xuat Viec xd ly aeid vung can d i y gieng la c i n thiet ddi v i khd khan li^n quan tdi k i t tda thd cap Khd khan chinh vdi hau h i t cic gieng, vl thdi gian thiic hien eac qua liln quan tdi nhiet dp cao la van d l I n mdn Nhiet lam trinh cdng nghe (nhu khoan, hoan thi&n gilng, b i n via, t r i m trpng thgm qua trinh an mdn c i n khai thic, dng chong sda chda gieng, khai thac dau ) dp tham cua vung via thudng bj ton hai dang ke sU Ilng dpng cac vat ehit [1] Tdc dd i n mdn kim loai nudc bien cd chiia khii nhiet 80°C cao gap l l n so vdi tnidng hpp nhifit dp28°C ngan can k h i nang luu thong cua dau kem, d i n den nang suat khai thac hoae bOm ep cua gilng g i i m manh Bin chit cua edng nghe xd ly aeid thdng thudng 11 bom dung djch chda acid vao day gieng khoan d l dUa vao vung via lan can d i y gilng vdi i p suit bom nhd hon ap suit p h i vd via, thdng qua eO che phin dng hda hpc l i m hoa tan d l phuc hdi hole lam tang dp tham cua vung via chda Vdl da chda carbonate, xd ly acid cd t i c dung tao hoic md rpng nhdng kenh dan t i l n sau vao ben via sin p h i m Kit tua t h d c i p g i y bft nh^t khdng gian rong, din tdi giam dp t h i m via chda Tnang nhieu trudng hpp kft tua t h d c i p d i n tdi h i l u dng am sau xd ly, tdc sau xiJI^ dd t h i m via g i l m di Dang via chda c i t k i t tai cac mit Viet Nam cd d i l m die biet l i chda it SiO, ddang cat thach anh, nhung lai chda nhilu khoing set va khoing felspat [2], nin k h i n i n g x i y k i t tua thd cap eie sin pham gel silic (SiOj.nHp); CaF^; K^SiF^ Na^SiF^ la r l t Idn Kettija Vdi da chda luc nguyen, xd ly acid chu yeu loai bd nhilm hydrocide sit III - FeCOH)^ cung cd xic suit cao cic ban nhim phue hoi tham nguyen trang cCia via chda gilng khai t h i c d Viet Nam vi dieu kien nhiet dd cao, phJn vung can d i y gilng; dong thdi md rdng hd thdng kenh d i n dng i n mon dien hda x i y rat manh nham tang dd tham cho vung via niy Qui trinh cdng nghe xd ly acid thdng thUdng luon di liln vdi viec I p acid vao via va chilu sau xam nhap nhd chi t i c dpng len Idp da vdng l l n can day gilng khoan Chinh td die diem n i y nen phuong phap dupc gpi la xii 1]^ acid vung cin day gilng 26 DAU KHI - sd 9/2013 Ly g i i i chpn kieu h i hoa pham de xuat nghien cHa dUa vao i p dung Theo t h i n g ke cda nhdm t i c g i i , moi n i m cicc6ng ty d i u tai Viet Nam t i l n hanh tren 50 lupt xd living PETROVIETNAM cin d i y gieng vdi tong g i i trj d i u thuang pham khai t h i c th&m dupe len tdi hing N g h i i n cdu v l I t h i nang han che tram nghin tan Rieng n i m 2008, Vietsovpetro thUc hien 52 lupt xd ly vdi k i t tda thi} c i p gel silic • tong sd lupng dau khai thac them dupc la 82.600 t i n Phin dng h o i tan vat lieu silieat Trong tai lieu nghidn cdu cua nhilu t i c g i i , doi tupng cat k i t tai eac vung trung : khic tai Viet Nam thudng chda ham lupng sdt, felspat kali va t r i m tich hat mjn cao Da sd tram tich cat k i t dd cd nhiet dd cao v i r l t cao Mdt nhdng t r i m tich cat ' ket diln hlnh la ddi tupng Oligocen, Miocen md Bach H6 Bay gilng khai thae t i l u thy HF xiy nong HF • cac t i n g chda cd nhiet dd r l t cao (120 - 145°C) Chlnh vi vay, hudng nghien cdu nhim dua vao dng dung kieu he dung djch xd iy mdi la r l t c i n thilt Khi ndng dd HF cdn lai thap Be khic phue mpt p h i n cic nhUOc d i l m li^n quan tdi kilu he acid n^u tr^n, nhieu giai p h i p ky t h u i t dupc cae hang dich vu dUa vao sd dung nhu [3 - 8]: i g i l m ham lUpng HCI; t i n g t^J- \i HCI/HF (bing cieh g i i m thieu tdi mde cd the h i m (lupng HF, nhdng tang the tfch dung dich xd ly); dung th&m acid hdu co thay cho I mpt p h i n hoac toan bp acid HCI; dng dung eac c h i t dc c h l i n mdn mdi; tang Icudng hieu dng dem; dUa t h i m hpp chit chelat vao thinh phin dung djch xd ly; (dung kieu he tren cO sd hpp c h i t chelat v i NH^HF^ Trong sd cic giai phap tren, Igiai p h i p dung he hda pham tren co sd hpp chit chelat v i NH^HF^ i i giii p h i p "tien t i l n ve ky thuat [8 -10] D i y eung ehinh la kilu he ma nhdm t i c g i i d l xuat J nghien cdu dua vao I p dung 14 Thanh phan chi'nh va ctf che tao HF cua kieu he hoa pham mdi xuf ly vung can day gieng Kieu he hda pham de xuat nghien cdu dua v i o i p dung chda hai p h i n chCi y l u la acid phosphonie nhu: l-Hydroxyethylidene-1,1-Diphosphonic acid ^(thudng duoc viet tat 11 HEDP, HEDPA) va t h i n h phan thd hai la mudi NH^HF, [8 ,10] Phin dng giCfa HEDP va mudi NH^HFj tao HF va muoi ammoni phosphonat .HEDP cd nguyen t d H, nhung chi nguyen td H t h i hien tfnh add manh hon, nguyen t d H the hien tfnh acid y l u hPn Vi vay, sin pham HFtao r a t U p h i n Ung cua HEDP vdi NH^HFj x i y theo nhieu giai doan va phu thudc v i o viee HF tao edn dd eao: SiO, + 6HF->H3SiF, + H p (1) xudng, c i n bing p h i n dng (1) chuyin djch theo chieu ngupc lai tao acid HF: H^SiF^ + 4HjO -» Si(OH), + 6HF (2) Si{OH)^ ket tua dudi dang t h i keo iien khdi Si(OH),.nHjO g i y bit nh^t 16 rong, g i i m tham eua da chda cat kit Vi vay, n l u han c h l hoic khic phuc hoin t o i n hien tupng k i t tda gel silic thi xie suat edng xd ly acid se tang cao Chinh vi ea che tao gel silic nhu tren, n l u dua HF xudng thap bing each cho nd tie dung vdi vat lieu chda silic thi se tim dUoc d i l m gel silic, Si(OH}^ b i t dau k i t tda Khi gel silic k i t tda, tinh khuc xa anh sing, dung dich se trd nen due Nhdm t i c gia dung v i t lieu chda silic dang Idng t d thuy tinh idng, silieat natri lam v i t li&u md phdng ed dupc tieu thu di khdng Giai doan t h d n h i t x i y vdi nguyen t d H hoat tinh eao nhat: OH OH CH3 OH LO = f I I I P — C — P Z I O + NRiHF; I I OH OH K> 2HF + ONH4 OH OH OH 1 ~ P — C — P I I Trinh t u thi nghiem xac dinh CHj OH OH CH, OH I P = + NH,HF2ONH, OH CHj I OH I OH I c — P : • 2HF + O : ONH, djch acid: Pha loang dung dich thuy tinh long lan; Cho 100ml dung djch acid Giai doan tiep tuc xay vdi nguyen td H cd hoat tfnh cao thd hai: OH ngudng k i t tua gel silic dung I OH cin chuan dp v i o coc 250ml, pH dung djch trudc chuan dp; Bat cdc dung dich tren len b I p khuay td, khuay vdi tdc dp khoing 100 vdng/phdt; Giai doan tiep tuc xay vdi nguyen tCf H co hoat tfnh cao thijf ba; Bd sung CaCO^ de pH hdn OH • CH3 OH I I I K, — p _ C _ P — O+NHJIF, •.2HF + I I ONH, OH ' ONH4 ONH CH, I I I i OH l iP — C ONH, in hpp dat 2,2 - 2,4; Nh6 t d t d dung dich thdy I tinh long da pha d tren eho den DAUKH|.s69/20ia 27 I HOA - CHE BI£'N D A U K H I tr^ng t h i l khdng Hdn k i t , nSn cd m i t dung d|d b i t d i u x u l t hi^n k i t tda thi ddng ehuln dd Ghl l?i t h i nd cd t i c di^ng phdng ngda l i n g dpng gel FetOH)^, Vl^i tfeh dung djch thdy tinh Idng; chdng minh k h i n i n g ngan ngda t?o gel Fe(OH)j dUdi Td the tich thdy tinh Idng chuin d ^ d tr^n, t l l n t i l n h i n h thdng qua xic djnh h i m lU(?ng ion Fe** tudc h i n h chuin dd 1?i vdl d i y cic t h i tfch khic nhd hdn n i m dung djch acid chda mu6i s i t hda tan v i HEOf the tich d i t i l u tdn d t r l n v i d l tmh 12 gid d l xic djnh (vdl s6 moi tUdng dddng) pH cda dung djch niy tine chfnh xic d i l m tao kIttCia; \in Vl^c xic d|nh h i m lUpng Fe** dung dich acid Ghi lai t h i tich m i t^i dd b i t d i u xult hl^n k i t tda tr&n t h i l t b] p h i n tich so m i u (UV-VIS) DR5000-HACH (dung dich hoi v i n due sau 12 gid); Trlnh t d thf nghl§m xac d[nh h i m Idpng Fe** Bo pH dung djch sau ehuln dd v i l i p b i n g k i t dung djch: q u i thuc nghi|m Chuin b] cic m i u dung djch acid c i n thi nghiSm, Kit q u i thi nghidm d Bing cho t h i y t i n g h i m vdi t h i tfch khoing 2.000ml; lupng HF td - 3% (s6 lieu cd s6 thd t i / - 4), ndng dd SI d i n tdi x u l t hi$n k i t tua g i i m d i n tde k h i ning chdng Giy n h i l m b i n Fe^' cho dung djch acid (bing tao gel g i l m d i n Kit q u i d Bing cung cho thiy, FeClj.dHjO) vdi cic h i m lupng Fe^* khic (2,000ppm; c l d h i m lupng HF = 3%, k h i n i n g phdng ngda k i t tda 4.000ppm ); gel silic cua h i HEDP + NH^HF^ v i n cao hon cda cic dung B sung chit chelate c i n nghifin cdu (HEDP) vcfi si djch acid truyin t h i n g l i HCI/HF = 12%/3% v l HCI/HF/ moi tuong dUPng vdl s6 moi Fe'* da g i y nhiem bin dtrfin; CH3COOH = 12%/3%/5% Cdn d h i m lUpng 2%, h i m B sung CaCOj dang bdt v i o dung djch trfin chotdi luong cd xac suit sd dung eao thuc t l , k h i n i n g pH dat 3,5 - 3,8; phdng ngda k i t tua thd elp cua he HEDP + NH^HF^ (d pH = 4,4) cao hpn khoing 40% so vdi k h i ning n i y cua - Chia dung dich n h i n dupc t h i n h nhilu phin (mdi kieu he truyen thdng HCI/HF = 12%/3% (d pH = 1,7) p h i n 100ml) 64 tTnh d cic nhiet dp: 25 - 27"^; 50°CT1idi gian luu mau gid tdi 24 gid; Kit q u i nghien edu tren cung tUong tU vdi k i t q u i cua cic nghien cdu khae (11,12] Theo dd, chuin d6 dung djch Sau thdi gian luu mau, hut mdt p h i n mau (khoing sandstone acid (HRHV) bing silieat natri (20 Be) tdi pH = 3,8 5ml), Ipc qua giay Ipc de t i c h dang khdng hda tan, sau 90%) so vdi cic thdng sd tuang tucda thi nghiem Gel s i t - FeOH), se tao dung djch pH t i n g H i m lupng Fe** tU thi nghiem cao hon rlt cao HEDP la chat chelat cd k h i n i n g gid cic ion Fe^* d nhieu so vdi cie thdng s6 tUc^g tUeda thi nghiem Bdng Kit qud thi nghiim khd ndng phdng ngda kit tCia gel silic cua hi hda phdm HEDP + NH^HF^ I Th^nh ph^n cic hS hda ph dm dUtfc pH thd nghifin ban tfiu I HEDP+ NH4HFJ tao ral%HF ' HEDP+NH4HF2 tao 1,5% HF T h i tich NaiO.SiOi 50%gayklttCiagel silic, ml '-i HEDP+NH4HF2taora2%HF HEDP + NH^HFi tao 3% HF |HCn2% + HF3% j HCM2% + HF3% + CH3COOH5% 1,7 Ghl chu- Nhiit thi nghiim 25°C, the tich dung dich acid lOOml 28 Diiu KHf - Sd 9/2012 Bdng Kit qud nghiin cdu vi khd ndng phdng ngCfa kit tda gel Fe(OH)j cOa h^ hda phdm HEDP Th^nh p h i n dung djch ban d i u TT Nhi«d6("CI Ndng dd Fe" tudo sau Ithi trung hda bing CaCO, tdi pH = 3,5 - 3,8 vdi thdi gian theo ddi ithdc nhau, ppm ^ 6gid ISgid HCil5% + 2.000ppmFe^* 2S 20 30 HCn5% + 4.000ppmFe'* 25 HCM 5% + 2.000ppm Fe^* + HEDP 25 ^ HCi 15% + 4.000ppm Fe" + HEDP 25 30 750 990 40 • 1 j j ^5 670 670 40 24gid 10 i j 25 610 649 20 HCI15% + 2.000ppmFe" 50 HCil5% + 4.000ppmFe" 50 HCM5% + 2.000ppm Fe'* + HEDP SO 1290 1220 ] 1120 HCM 5% + 4.000ppm Fe'* + HEDP 50 2200 2190 ! 2010 50 40 30 Ghi chd- Khd ndng phdng ngtto kit tda gelFefOH}^ ciio hi hda phdm HEDP duac ddnh gid thdng qua xdc dinh hdm lugng Ion Fe'* tUdo lai ndng pH dung dich lin 3,5 bdng CaCO^ Quy l u i t n i y cho t h i y cd mat cua HEDP May linh h i m lupng Fe'* t u n i m dung djch v i n gid d mdc cao, hay ndi cich khic, HEDP cd t i c dung tot chdng tao gel Fe(OH}j Cae cap thi nghiem 5, va 6, thUc hien d nhiet 50°C cdng cho k i t q u i tuang t i i v e t i c dung cua HEDP chdng tao gel Fe(OH)j Tuy nhien, so sinh k i t q u i d nhiet dp eao (cac thf nghiem - ) vdi cic k i t q u i d nhiet dp t h i p (cic t h i nghiem - 4) cho thay I i k h i n i n g chdng k i t tda gel Fe(OH)j cua HEDP tang nhiet dp t i n g Nghien cihi so sanh t i n h an mon cua he Hinh I.Sudd thiit bl ddnh gid tdc dd dn mdn bdng phuang phdp diin hoa hoa pham so vdi cac kieu h^ truyen thong Nhieu nghien cdu [11, 13 - 16) eho thiy, h& aeid HEDP + NH^HF^ cd pH nam khoing 2,2 - 3,8 nen ft gay an mdn Bay chfnh la mdt nhdng Uu diem ndi bat cda he hda pham mdi de xuat so vdi he acid truyin thong tren CO sd HCI/HF LUpng chat dc c h l an mdn p h i i dung cho kilu he g i i m d i n g k l Theo nghien cdu [11,13], CO k h i n i n g giam 50% ham lupng c h i t dc c h l i n mdn Be khang djnh du the tren, nhom t i c g i i t i l n h i n h , d i n h g i i tdc dp an mdn thep theo phUPng p h i p viy, d l k i t q u i nghien cdu sat vdi thUc t l , de t i i sd dung loai thep PI 10 liy tU dng khai t h i c eua Vietsovpetro Mau thep sddung d i n h gia an mdn theo phuang phap m i t khdi lupng dupc gla cdng theo kich thudc 50 x 15 x 3mm nhu quy djnh cda tieu chuan ASTMGl-03 [12] Mau thep dung phUPng p h i p dien hda cd kich thudc CD = 14mm, d i y 3mm phu hpp vdi di^n ciic l i viec cda t h i l t bj PARSTAT2273 CIc mau thdp sau d i gia cdng b l mat theo ddng quy trinh dupc b i o q u i n ngap dau thuc v i t de trinh han gl b l mat dien hda d dieu ki&n nhiet thUdng, i p s u i t thudng v i phuang p h i p mat khdi luang d d i l u kien nhiet cao, Phuong p h i p dien hda (do dien trd phin eye Rp) sd i p suit eao cda he hda pham HEDP + NH^HF, cd h i m dung t h i l t bj Solatron PARSTAT2273 - Princeton Applied lupng HF khic Research - USA de dien trd phin eye vdi dien the q u i t 7.7 Phuang phdp Xin hda ddieu kien nhiet dd thtfimg, 0,1 mV/s, se xac dinh dUpc tdc dd i n mdn thep [17 -19] - l O m V d I n + l O m V s o v d i dien t h i c i n bing, tdc dp q u i t dp sudt thudng Vit lieu dung nghien cdu: Cic thiet bj sd dung Kit qua nghien cdu tdc dp an mdn theo phuang phap dien hda dupe dUa Bing So sinh ket q u i cae thf eong nghiep khai t h i c dau khf thudng duoe c h l nghidm - vdi thi nghiem cho thay, t h i n h p h i n hda tao tdthep cd ham lUpng carbon t h i p nhU: P105, P110 Vi pham cac thf nghiem - cd toe dp an mdn r l t thap D4UKHI-S6 9/2012 29 HOA - CHE' BIEN D A U KHi Bing Tdc d^ an mdn thip cua m^f s6 hda phdm (phuang phdp dlfn hda, nhi4td^ thudng) H^ dung djch add 6tf i n mdn (mm/nftm) T6C HEDP + NH-iHF)t?ora 1.0%HF 0,3038 HEDP+NH,HFj tao 1,S%HF 0,3744 ' HEDP+ NH4HFj tao 1,0%HF+1,5%HCI 0,3702 HEDP + NH4HF) t^o 1,5 % HF -i-1.5 % HCI 0,4323 , HCI15% 7,5029 D: Khdi lupng rilng eua kim loai,g/ cm*; K; H$ sd phy thudc v i o don v\ tfnh tdc dd i n mdn (Khi b i l u d i l n tdc dd an mdn b i n g ddn vl m m / n i m K=8,76x10*) Kit q u i nghiln cdu, dinh gii t6c dd i n mdn, theo phUdng p h i p mit khoi lupng, d n h i l t dif cao, i p suit cao diroc dUa Bing Nhilt dd thd nghl^ l i 100°C NhlSt dd n i y n i m d gidi han tr^n cua nhi|t dd ddng - nhi|t dd cd bom dung djch t d b l m i t xudng d ^ g i l n g B i y cung chfnh l i nhiet dd khjc nghidt xd ly^ Ap suit thi nghi§m lilSOat Hinh la dd thi dUOc ve tren cOsdso li^u cic thi n g h i l m - Bang4,D6 thj b i l u thi i n h hudng cda him luong HF tfnh t o i n hd HEDP + NH^HF^tfi tdc dp i n mdn d dieu kien nhiet dp cao, Hinh Thiit bl ddnh gid tdc dd dn mdn bdng phuang phdp mdt khdt luang so vdi dung djch HCI 15% (td 17-25 lan) Toe dp i n mdn i p suit cao Bo thj t r l n Hinh cho thiy xu hudng t i n g nhanh tdc dp i n mon klii h i m lupng HF tfnh toan he hda pham ting va dcac eie cap thi nghiem l , v a 3,4 eho thay, sy thay ddi h i m lupng thap ( % va 1,5%) toe dp an mdn ft inh hudng ham lupng HF khdng i n h hudng nhleu tdi tde dp i n mdn eda h i m lupng HF tfnh t o i n B i l u kha quan vi thep So sanh tdc an mdn eda cap thi nghiem 1, vdi thye t l ta thudng dung h i m lupng HF d cac hSm cap 3,4 cho thay, sU cd mat cua 1,5% HCI khdng g i y i n h lupng t h i p niy hudng Idn tdi toe dp i n mdn 7,2 Phuang phdp mdt khdi lUgng d diiu kiin nhiit So sinh tdc i n mdn cua he hda pham mdi de cao, dp sudt eao x u i t vdi h i m luong HF tfnh t o i n 2% (HEDP + NH,HF,tao 2% HF d thf nghidm 3, B i n g 4) vdi c i c dung d|ch acid g i n vdi thye t l cdn dang sd dung (hd HCI 15%; HCI 10% Phuang phap sddung t h i l t bj Autoclave cda hang + HF 2% v i hd HCI 10% + HF 2% + CH.COOH 5% Cortest - My (Hinh 2), cd t h i thUe hien theo hUdng d i n eua cic thi nghidm - 7, Bing 4) cho t h i y tdc dp i n m6n tieu chuin ASTM Gl-03 [12] Ngoai t u i n thd tieu ehuln d d i l u kien n h i | t dd cao, ap suat cao cua kieu he hfia ASTM Gl-03, thd nghiem dUdi i p suit thudng thi dya p h i m mdi d l x u l t t h i p hOn r i t n h i l u (11 lin) so vdi cic tren tieu ehuln ASTM G31-72 [20], thd nghiem k i l u he dung djch xd 1;^ vung can day gilng dang c6n mdi trudng hoae nhiet dp eao hoac i p suat eao, hoac c i hai dupe sddung thi dya tren tieu chuan ASTM Gl 11-97 [21] So sinh toe i n mdn cda he hda p h i m mcri dixuat Theo tieu chuan ASTM Gl -03 v i ASTM G31 -72, tde dp an mdn dupc tinh theo cdng thdc: K.fV Toe dd an mdn: ' A.TD Trong do: W: Khdi luong kim loai bi mat di sau t h d nghiem, g; A: Dien tich b l mat ban dau eua m i u kim loai, cm^; T:Thdi glan n g i m mau, gid; i 30 Diu KHi-sd 9/2012 vdi h i m luang HF tinh t o i n 1,5% v i 2% (eie thf nghiSn v i 3, Bing 3) vdi cic he ed chda thdm 1,5% HCI ((A thf nghidm v i 9, Bang 4) cho t h i y cd mat cOa HCI vdi ham lupng 1,S%, tdc dp an mdn cda kieu hd HEDP + NH.HFj tao 1,5% HF v i HEDP + NH^HF^ tao 2% HF t i n g Idn khoing 3,2 l l n Thinh phan cic hd hda p h i m cic thf n g h i ^ g i n vdi t h i n h phan d u kien m i nhdm tac g i i mongw Bdng Tdc dd dn mdn thip cda m0tsdh6a phdm ddiiu kiin nhiit dd cao, dp sudt cao Dung dich IVIat kh6i luang am, (g) HEDP+ NH4HF2 tao 1%HF I HEDP+ NH.HF2 tao 1,5%HF HEDP+ NH.HFj tao 2%HF HEDP + NH.HFj tao 3% HF HaiO% + HF2% HCI 10% + HF 2% + CHJCOOH 5% HEDP+ NH:,HF3 tao l,5%HF + HCn,5% I HEDP+ NH4HF2 tao r; i 2%HF + HCn,5% BD E e" fiO ^ 40 - 20 T6C an mdn,(mm/nam) Tirng mau 0,3233 40,26 0,3266 40,67 0,3096 38,55 0,3494 43,51 0,3325 41,40 0,3384 42,14 0,4615 57,47 0,4687 58,37 0,4634 57,71 0,7211 89,80 0,7337 91,36 0,7331 91,29 6,3816 794.67 6,3372 789,14 6,3032 784,91 5,3812 670,10 5,4736 681,60 5,4959 684,38 5,3293 663,63 5,2816 657,69 5,2588 654,86 1,0605 132,06 1,0754 133,91 1,0853 135,15 1,5172 188,93 1,5332 190,92 1,5297 190,49 • HEDP- • HFDP* _^: ^^k* ^^m ^^^mm Hi doBg Uicli eEDP+\H,HFj inh Anh hudng cua hdm luang HF tinh todn he hda ^dm tdi toe dd an mdn Trung binh ^ E E *: 400 ,„„ •^ 200 " "'0 1 • HFDP-S ^.KF-Iff •r.';^ • _ ^M • " " " ã -HF2% H\-HF1 ãJff[.^"rflCl llrdu