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Thong tin khoa hoc cong nghg mo "W CAC PHU''''ONG THirc VAN TAI HAM LO VA KHA NANG AP DUNG BANG TAI ONG TRONG KHAI THAC MO VIET NAM Pipe conveyor is a continuous transport equipment for bulk and loose ma[.]
Thong tin khoa hoc cong nghg m o "W CAC PHU'ONG THirc VAN TAI HAM LO VA KHA NANG AP DUNG BANG TAI ONG TRONG KHAI THAC MO VIET NAM Pipe conveyor is a continuous transport equipment for ThS HLTA NGOC SON bulk and loose materials, improved from the conventional V/#n Ca NSng luang vi Md trough conveyor So far, pipe conveyors have been widely TS TRINH BANG HyNG applied in many countries with developed industries The paper represents the underground transportatbn means andVien Khoa hgc Cdng nghi Md - Vinacdmin Bien lip: TS Phgm Minh Di>c the capability of applying pipe conveyors to mining operations Phyang thirc v l n tai khai thac than h i m Id Oli tygng cOa v | n tai khai thic h i m Id la; ngydi, than, d i t d l thai, vat t y thilt bj vv Sau triln khai khai thic md Id ngly d n g slu, d n g ngd nglch, khoang elch vgn tai ngly d n g keo d l i tir cO'a Id din Id chg, hg thing vgn tai trd nen phu'c tgp, ed dgng tang Do vigc b l tri ngydi lam Id, vigc eung d p vgt t y m i y mdc, nhanh chdng cho than v l dat d l thii ngoii ngly cing khd khIn Cho nen, du cd co gidi hoi hign trydng khai thic nhy the nIo di ni^a m l k l hogch vgn t i l khdng hgp ly, phyong thO'c v|n tai khdng phu hgp thi higu qua khdng the cao dyge V|n tai Id bj I n h hygng bgj d o dilu kien nhy; tru' lygng than, tinh hinh via than, dieu kign dja chit, phygng thyc mg via va khai thic, khoing elch v | n tai Idn hay nhd, hign trygng sO' dyng vgt ty, may mdc, lygng vgn tai v.v v l nhO'ng dilu kidn t y nhien khic N l u phin logi theo i^a bin, cdng t i c vgn tai dygc phan logi nhy vgn tai Id chg, van tai dydng Id nhlnh, v | n t i l Id bing, vgn tai Id hg gilng nghidng, vgn tai gilng du'ng TCr m l cd t h i phan nhilu logi Hidn nay, phuong thyc vgn tai h i m Id ndi chung dyge sir dyng g i m cd vgn tai hai chilu v l van tai lien tyc Vgn t i l hai chilu la van tai dudng s i t (cd vgn tai keo d p va vgn t i i bing d i u miy) Trong v | n t i l lien tuc cd v | n tai bang nhilu logi bang tai, ming d o dang dugc sy dyng rdng rai d c dygng Id Quylt (^nh phygng phip v | n tai Id, phai d n nhle den d c yeu t l nhy v l n d i u tu, trinh dp ky thu|t, kich thyde dydng Id, thdng gid, thoat nygc, v | n chuyin edng nhin, v|n tai khoing san, vat tu d l vigc v | n tai dygc kinh t l , dam b i o an toln v l mdi tni-gng Tuy theo nhu'ng phygng I n khai thic m l md via bang Id bing, gilng nghieng hole gilng dyng Trong khuIn k h i b l i b i o nly eht d l cap chu y l u d i n vgn tai g Id bang, gilng nghieng v l k h i nang sO' dgng bang tai I n g khai thac md miy toa xe v l bing t i i Ngoii chd than, v | t lieu, d i t d l thai, trygng hgp, ta phai chuin bj thilt bj vgn t i l nhy d i u miy d l chg ngydi Tuy nhien d l i tygng v | n chuyin chO y l u v l n I I than chilm ty Ig khii lygng nhilu nhlt VI vgy, diing bang tai chg than d n thilt chuin bj trang bj v | n t i i d i u miy toa xe egnh bang tai VI vay, so sinh hai loai vgn tai nay, phli xult phit tu- ting hgp nhu'ng nh|n xdt trdn Ngoii ra, cdn phai tinh d i n nhOng van d l lien quan d i n an toln (ed hay khdng cd sy c l , trg nggi ) Cf Nhgt Ban, tinh toln tinh kinh t l giu'a v|n tai diu miy toa xe v l bing t i i dugc trinh bIy tgi hinh Tren dydng thing ab, ehi phi v|n t i l cho t i n vdi d hai phyong phap la tyong d l i gilng Trong phgm vi A bing tai I I cd Igi, phgm vi B d i u may toa xe I I cd Igi Vi v|y, n l u ndi mdt elch khii luge tO' quan dilm ehi phi v | n tai, n l u lygng vgn tai nhieu v l trygng hgp cy ly vgn tai tyong 1.1 Ld bang d l i ngln thi dimg bang tai Igi Vigc v|n tai d c dydng hgn v l ngygc lai, n l u lygng Id bing, chO y l u thudng dung vgn tai it, cy ly d l i thi dOng d i u phygng phip v | n t i i bang d i u m i y toa xe I I cd Igi Ngoai ra, m i y keo godng eo Idn md d l y vdi vgn tai d i u miy toa xe hole diing phuong phap vgn de t i n g giam s i toa ndn ed t h i chuyin bing tai Mpt v l n d l d i l u chinh d l d i n g nIng lyc v | n t i l d Id bing I I c i n v | n tai Neu nhin tir quan diem nhac Igi t h i giu'a vgn tai d i u KHCNM s d 7/2014* CO DlfiN - T D O N G H O A Thong tin khoa hpc cdng nghe m o y 8000 m m ion mm %6m fsooo A •^ ^3^~ ^ ^ ^ B S'2000 a/ I 1 na 2K» 2W0 30OO 3900 Khoing dch vin chuydn Hinh Bidu thi tinh kinh ti giOa diu miy toa xe vi bing tii an toln, v|n t i l d i u miy toa xe d l i vdi d i u m i y dung d i u t l u d n vgt thi ed nhu'ng v l n d l v l tieu chuin quy djnh an toln, ve v l byi n l O l tranh v l n d l nly ngydi ta sy dyng d i u miy I c quy, nhien, khdng phai luc nIo cung cd tinh kinh t l Ngygc Igi phygng phap bang tai d l i , dpng eg It nen sy e l v l dign cung It di, cd kha nang chg lygng than Idn mpt elch lien tye [ I ly tygng nhlt 1.2 Gieng nghidng 1.2.1 Vin tii toi kdo B l tri tdi kdo g d i u Id hg hay gieng nghieng, Igp mpt dpin going hpgc thCing tryc vdi s i tea nhlt djnh v l dOng tdi keo Idn, gpi II phyong phap van tai tdi keo Phygng phip n l y cd Igi cy ly keo ngln, lygng keo it Khi dg s l u d i o Id d n g ting thi nhO'ng nhugc dilm nly cd anh hydng d n g Idn d i n cdng vigc quan ly v l kinh doanh Trong kdo tdi tryc tilp, nli d o toa xe v I o d i u tdi, hogc tiln hinh c l e thao t i e thio ra, ngydi ta phai su' dyng su'c ngydi, thao t i e khd khan nen m jm m m iKo las Chiiu dii Id nghiing (m) Hinh Bidu thi quan hi nghiing, chidu dii vi luang than tdi cda mdi tdi true ndi Chung khd dung logi d p ed mire chuan khic di thi sO- dyng dygng kinh tren 38mm Vi t h i , s§ khd khan so toa xe keo mdt l l n b| Trong t r y i n g hgp d o Id hgn che bgi cydng dd v l sy an nghieng cOng hg thing v|n t i i toan cua elp keo v l nang suit tai gilng nhau, T i e dp keo cOa tdi, trO' tang s i bgc khdng t h i trinh nhu'ng trygng hgp dgc bigt, Idn khdi giam nIng suit thdi nhlt khoang 6m/giay, khdng gian chd dgi chgy len xuing Id chgy, t i e dp Idn hon bgi vgy, se Theo kinh nghigm, tl Id giam rat nguy hilm Vi v|y, n l u Id n l y CU' m i l bgc I I 7% + 10% nghieng dli, thdi gian keo tang So bgc ting len lim tang chi len, nang lyc keo cOa tdi d i n phi cho nhin lyc, s i toa xe, de d i n giam xuing M l i lidn quan kdo t i n than S l sy d , tai giu'a dd d l i va nang lyc kdo ngn phit sinh tdi kdo nhilu theo tu'ng dd nghidng cd s y hgn d c kilu v | n tai khic, chi dyng d p 36rnm g Nhlt Ban d n sg suit nhd cung cd kha dugc trinh bIy tgi hinh nang I I nguydn nhin cOa tai Vdi trydng hgp mpt ngly de ngn Idn, cung nhy phai b l tri keo 10OOT than sach a Id cd dd d c trgm bane, hole d c thilt bj doc 15°thi gidi hgn chieu d l i I I an t o l n khac godng, thung 700m, dd sau thing dCrng I I tryc bj dCrt d p Thdm nCl'a, mit 180m o l kdo lygng than thdi gian de phyc h l i sy c l tygng ty g dp sau hgn phai thdi gian dd, se g l y trd thilt k l kdp dpgn dd sau ngai cho s i n xult v l thdng gid thing du'ng dudi 180m n l u Vgn t i l tdi keo Id nghieng cd chuyin tai dygc tren nhieu nhugc diem nhy da neu 1000T thi cimg mCrc nhy vay, tren v l mgt an t o l n v l nang phai ting thiet bj Khi dOng tdi suit, nhyng khai t h i c d keo kep, nlng suit tang g i p p h i n ndng cd yu dilm la lan nhyng chi dygc su' dgng d i u t y thilt bj It, d l than Vi trudng hgp kdo kep tu' t h i , nhieu md than tgi q u i trinh mCrc nhlt djnh, n l u mu'c keo khai thic ban d i u d i u su' dyng n l y d i n d i n t i n g len, hogc phygng phip d l khai thac KHCNM SO 7/2014* CO Dl t N - Tlf D O N G HOA Thdng tin khoa hoc cdng nghe m o phin md Id thien & nhu'ng md triJ lygng thyc thu it, khdng cho phep day t y thilt bj nhilu, ngydi ta bat budc phai I p dyng phyong phip nly Nhyng n l u dp s l u tang len, nhu'ng nhygc diem d n g tang theo, l i m sinh anh hudng x l u tdi cdng vigc quan ly kinh dcanh Nhy vgy, vide dOng tdi tryc tilp cho v|n t i l chinh I I khdng od Igi nhyng d khu s l u hogc khu vyc moi g thdi ky d i u khai thac ngydi ta v l n phai sCr dgng nd, nhyng nhO'ng dydng Id ehinh cOa d c md khai thic cd tinh quy md thi ndn trinh phyong phip than keo tdi nly Y.2.2 V$n tai bang tai Nhyng thdng so co ban cOa elc logi bing tai thygng hign nhy chieu rpng bing v l t i c dp dygc Hgt ke trpng bang V l dp d i e d l bang tai cd kha nIng chay dygc, ed khic theo dgng v l tinh chit cOa v|t tai (bang 2) Theo bang 2, dp nghieng Idn nhlt bang tai thudng cd t h i chd than v l d i l l ; 18°+22° Nhirng uv diem van tii bing tai Id nghieng: - Chi phi thip, nhwng nang Itjrc vin tai so vdi tiii keo lan hon nhieu Do chieu rpng bang, t i c dp bing m l lygng v|n tai thay d l i , nhyng nang lyc v|n t i l cOa bing tai Idn hon nhieu so vdi tdi kdo Vdi bang tai Idn hon 900mm, t i c dp Idn nhlt cc t h i dgt 240m/phut, nhyng d n g nhanh d n g de ed sy c l , tuli thp cOa bang cung ngan Igi, cho nen dOng t i c dg ndi chung la 120m+170m/phut TCr nguydn nhin chinh quylt djnh lugng "W Bing Chidu rgng bing vi tdc dg bing Chieu r^ng mm 300 400 500 Tie -Tidu chuan 60 m/phOt - Cyc dai m/phOt 90 60 75 90 105 eoo 700 900 1000 1200 90 90 105 120 135 120 136 160 166 200 Bdng Dd ddc cd khd ning tdi cOa bing tii Vin tai Xi mSng (rdi) Ddddc cdthd 220 Dgdoc c6 the 15° doc cd the Da (vgn) 20° 23° (trOn iSn) 26° 10° (cyc) Mudi (bot, hgt) cat (binh thudng) (khd) Thgch cao (bdt) Luu huynh (bdt) Than cgc 16° Sol cudi Than (cam) G l (bla) Than cSm mjn 22° (trdn) Than (nguyfin khai) 16°+18° Than coc 18°+ 20° Quing(da nghien) 20° B i tdng 12°+ 26° (H6n hgp) 18° Dat sa V$ttii 20° (Cyc) 16° Gily bpc 16° 20° goi * Gdc cd thi chay diing cho bang tai gSu25°+46° * Gdc dd c6 th^ chgy dung cho bang tai 6ng 60° NgO coc van tai I I dien tich mgt d t vat lieu chira trdn bang M|t d t khic t u j thudc chung logi bang tai, chilu rpng bang, gdc nghieng thinh ming, kich thudc cOa vat tii D l i vol md khai thic xuing slu, chi phi d i u ty thilt bj, chi phi v|n tai eho tan than so vdi phyong phip v | n tai khio re hon, cdng nhin sO' dyng cOng It hgn Nlu so sinh g l l tien diu ty thilt bj, g l l tiln san xult t i n than cua phygng thu'c gilng du'ng sy dgng tdi nIng v l phyong thO'c bang tai Id nghieng thi phygng thO'c bang tai Id nghidng chi bang 1/2 phygng thO'c gieng du'ng tdi nIng Khi ting dd sau khai thic, vigc keo d l i bing v l dp d l i gilng nghieng, bao gid Vit tii 18° 16° 20° 20° 16° 23° 21° eung cd t h i tri dygc nang lyc van tai tyong ty, s l cdng nhin d n thilt cho van tai cO' keo thdm 1000m thi ting mpt phia mpt ngydi gilm s i t I I dO Nhy vgy, v l n d i u tu thilt bj v l phi van tai can thilt cua nd so vdi phuong thCre khic re hon Ngygc lai, d v|n t i l tdi kdo nhy da ndi tren, vigc ting cy ly tdi, nIng suit tdi d i n d i n giam di, cudng dd v l t i c dd keo cua d p m l hgn c h i chilu dai mpt dydng Id, vygt q u i dp dai dd, phli n l i them vgi dydng Id nghieng khic, thi phai thay del Igi hg thing tdi trgc hcge phai kdo dogn rlt phyc tgp v l t i n kem ; De ding tang cdng suit v$n tai, cd the than giu'a chimg KHCNM s d 7/2014* CO DitN - TV D O N G H O A Thong tin khoa hpc cong nghg mo NhO'ng mo than c6 tru- lup'ng 16-n vd Q\hu ki^n khai thac t6t, dan dkn quy mo cQng I6n len Mo than c6 dieu ki$n nhu- vgy thi viec gia tang nang lire vgn tai du'g'c tiln hdnh d l dang mi khong can tro' vipc t6i thilu von dau tu' thilt bj vi san xuat Trong vi§c vgn tai bang bang tai, tang chilu rpng bang tai, t i c dg bang, tang cong suit keo bang co t h i d l dang tang nang li^c v$n tai Nlu phin chuan bj cong vi$c vao ngdy thu'dng g i p kho khan thi CO t h i siJ dyng nghf d l hoan thdnh cong vi$c Khi su* dung td'i thi gia tdng cdng suit v|n tai mgt den vj thd'i gian hlu nhu* khong co kha nang Nlu phai thyc hi$n dieu do, thi phai cai tgo cc ban cac thilt bj liSn quan d i n Id gilng Tru'dng hp'p vgn tai bang bang tai 16 nghieng, c i n thilt k l nhlj'ng l^o chu-a c6 dung lu'p'ng chLHa thich hp'p theo ti>ng mi>c Idm vi^c, vgn tai giCra chCrhg se rat dan gian vd hp'p ly - Si/c6 lien quan den van tai it, CO tinh an toan cao nhit Phan Idn nguydn nhdn gay sy c l vd tai ngn van tai lien quan d i n toa xe Dgc bi^t gilng nghieng su' dgng tdi keo NhO'ng chile chot long hogc cdp dul se lam cho toa xe lao xuing hogc ch^nh ray nen chT can sa suit nho la c6 t h i d i n d i n nguyen nhan phat sinh tai ngn Ngu-gc Igi, tru'dng hp'p v$n tai bing bang tai gieng nghieng, n l u quan ly tot, se khong co sy c l va cung khong c6 tai nan Tu" dilm nay, gan ddy v^n tai bang bang tai r l t thjnh hdnh Trong vigc dung bang taJ khau dp Idn tai nhO'ng vj tri chuyin t i l p (trung chuyin), n l u phun nu-dc tot, phat sinh bgi se cyc V.y it Tru'dng hp'p vgn tai bang bang tai gilng nghieng doi vdi than nggm nhieu nu-dc se r l t kho khan va phai thilt ke mgt du'dng bang tai rieng cho van tai vgt ligu vd d i t da thai Va d l i vdi bang tai thu'dng thi khdng si> dgng duvc cdc gieng nghieng cd dg doc Idn, hogc phai su* dgng nhieu bang n i n gilng uin lu'p'n Su* dung bang tai Ing cd t h i khac phuc nhO'ng v l n de ndu tren mOt each dan gian Bang tai dng (pipe conveyor), 1091 binh v^n tai cd n h i l u iru diem 2.1 Ljch stp phit trien va tinh hinh su' dyng bing tai ong Vi$c thiet ke vd su' dung cac logi thiet bj van tai hi$n dgi d i u quan tdm den sy anh hu-dng tdi mdi trydng Trong vdng hai mu-ai nam trd Igi day, tren the gidi, da thilt k l vd dp dgng nhieu kilu cau hinh bang tai khac Mdt nhO-ng bu'dc d$t pha dd Id bang tai Ing c l u tgo cua bdng tai Ing du'p'c dya tren ca sd nhO'ng bang tai Idng mdng binh thu'dng T^n gpi cua nd dug'c gan vdi m|t sy khdc bigt so vdi bang tai thu'dng Id sau nh^n vgt lieu vgn chuyin vd trydc dd tai, bang dyp'c cupn dang hinh nhu mgt cdi ong (hinh 3) Khdi nguon, bang tai Ing duyc nghien cdu vd phat triln mgt nhdm cac ky su Nhat Ban Khai nigm "bang tai Ing" dau tien dyp'c gidi thigu vao nam 1978 D i n ndm 2002, trdn the gidi cd khoang 700 hg thong logi bang tai I n g dai dang hogt dpng, chung c6 tong chilu dai khoang 160km vai h$ thing ddi nhlt tinh theo tam cdc tang dau vd dudi Id 5,5km Rieng s l bang tai I n g mang thuang higu Bridge Stone (ke ca logi ngan vd ddi) tinh den cuoi 2005 han 1200 h$ thing Bang tai Ing duac su dgng nhieu nhlt cac ITnh vyc khai khoang vd che biln khoang san, san xult vgt ligu xay dyng, cdng nghigp giay, d cdc cang biln 2.2 Wu va nhifqfc diem cua bang tai ong '1 i Hinh Mdt sd dang bing tii dng hl$n KHCNM SO 7/2014* CO D i j N - TIT B O N G HOA 1l^^&r* L) Thdng tin khoa hpc cong nghe md 2.2.1 L/u aim chinh Su dgng bing tai I n g cho thiy tilt kigm dygc 30% chi phi so vol bing tai thudng vi khdng phli dOng nhilu cdng dogn v | n chuyin Nhilu dilm trung chuyin se keo theo nhilu trgm diu cull v l keo d l i t i n g tuyIn bing (nguyen nhin I I bang tai thudng bj gidi hgn v l gdc nghieng va kha nang u i n cong tuyen bang) Do bang dyge cudn dgng Ing v l dm khit bdi it nhlt l l n tren mdi dilm cho c l hai nhlnh nen cd the u i n tuyIn bing cong di theo d mgt phang dCrng v l nam ngang {hinh 4) Gdc dm u i n cong cd t h i len d i n 45 dp v l b i n kinh ccng nhd nhlt cd t h i I p dgng I I 300 l l n dygng kinh danh nghia cOa bing Oilu nly cung lim giam di d c dilm trung chuyin v l giam chilu d l i sp vdi bang tai thydng Thgm chi, Cdng ty bang tai Ing Nhlt B l n JPC cdn thiet k l bang tai I n g vdi gdc dm u i n cong len d i n 900 vdi b i n kinh cong bang 600 l l n dydng kinh bing D i l u nly l i m gilm: - s l lygng elc d i l m trung chuyin v l d i n dpng, tilt kigm khdng gian v l chi phi; - Cdng suit ydu d u d l ning chuyin v|t ligu gia tang cd nhieu dilm trung chuyin; - Giam d c t i c dpng d i n v|t lidu v | n chuyin (va d i p vdi nhau, vd ) gilm sinh bgi tgi d c diem tmng chuyin; - Chi phi d i u ty nhd hgn han so vdi d c hg thing bing thang n l i tiep vdi Do s y phin b l vgt ligu v|n ehuyen Idng bang tai Ing, dign tich tilp xOc giu'a vgt ligu Bing Mdt s6 bing til dng dii dang sir dung trin thd gidi (tinh ddn hdt nim 2002) TT Dia diem tip dit Ning Chidu suit v^n dii(m) chuyen (T/gia) 2100 300 Nha cung cap Homestake mining Coal Mining Huainan M.P Melaka Refinery Barbers Point, AES Inc Jordan phosphate Utah Fuel Company Indo Gulf Copper Smelter Flour Daniel Kmpp Robins - 2300 Nova 2400 340 Krupp Robins 2500 1100 KochAustna Knjpp Robins 2800 3400 1250 1250 Conveyor Kit 3400 1800 800 Lagoven Kmpp Robins 5000 300 Bing Thdng sd ky thuit cOa bing tii 6ng so vdi bing thutmg a i chidu rdng & ning sudt tuong duong Duvmg Tiet Ning KIchthiriK Chieu dii kinh dien l/#n suit, v$tliiu, dng bing Bing thwdng ong til,V ong (mm) nhd nhat, bing, ^ bing, S (m/s) Q (mm) l.^«M(m) (m'/h) (mm) (m'i 150 200 250 300 350 400 500 600 700 850 0,013 0,023 0,041 0,049 0,066 0,108 0,155 0,216 0,280 0,404 2,17 2,33 2,5 2,92 3,33 3,75 4,17 4,58 5,00 95 180 344 441 693 1.296 2.093 3.240 4.620 7.272 30*50 50+70 70+90 90+100 100+120 120+150 150+200 200+250 250+300 300+400 18 20 23 25 30 35 40 50 60 70 300 + 450 500+600 600+750 750+900 900+1.050 1.050+1.200 1.200+1.500 1.500+1.800 1.800+2.000 2.000+2.400 v l m|t bang tang len, nd cd t h i nhCrng gilng nghieng cd gdc vgn chuyen vgt lidu len vdi mpt d i e > 23° (ngi m l bang tai gdc nghidng hgn 50°, nghTa I I thydng khing sir dgng dyge), cac hgn tu' 27° d i n 30° so Vdi cung nhy sir dung dyge tgi kha nang vgn chuyin dgt dygc nhO'ng dydng Id d l i va cong cua bang tai thydng (tu' 17°dln Kich thyde mgt d t ngang 20°) VI v|y, kich thudc cua eua bing tai Ing nhd hon bing tuyin bang cd t h i dyge gilm di tai Idng mang binh thygng nlu thay vi phai su' dgng nhieu cd cOng ning suit v|n chuyin, dpgn bing tai thydng d l v | n d i n d i n yeu c l u nhd hon v l chuyen vygt d i e hpgc u i n khdng gian mgt s i n l i p d|t cong, d i n d i n tilt kigm dygc D i l u nly rlt phu hgp vdi dilu c l e trgm d i u euli v l keo cang kign dydng Id md Holn t o l n cd t h i sO dgng d Sy g l y d nhiem mdi trygng KHCNM s 7/2014« CO D I £ N - TV D N G HOA Thdng tin khoa hoc cong nghe m o Hinh Bing tii dng cd thi udn lugn ci theo mit dimg vi mit nim ngang tic dpng cua v|n chuyen vgt lap dgt v l vgn hinh phu'c tgp lidu duge gilm d i n mCre toi da, hon tilt kigm dygc su'c ngydi v l 3, K i t Iuan v l k i l n nghj giam g l l thinh vl khdng phli e l dam bio sy thinh cdng lim sgch bui b i n v | n va hieu qua cua bang t i l Ing, chuyin v|t ligu gly Vat ligu trudc quylt dinh dau tu, vgn chuyin khdng gly d nhilm d n ein nhac nhu'ng van d l m i l trygng v l khdng bj thlt lien quan d i n bang t i l Ing, dd tholt qua trinh vgn II: ehuyen - Khi v l n d l mdi trudng 2.2.2 Nhirng h^n che ton ngly cing dyge chu trpng, tfli cua bang tii ong nhu'ng yeu d u ve dam b i p mdi Nhuge dilm chinh cua trudng ngly d n g cao, y l u to bing t i i Ing la chi phi d i u t y bat budc v l bao ve mdi trydng cao Thing thydng, gia mdt hg hay v | t lieu v | n ehuyen thing bing tai Ing cung eao d n g Idn, bat budc phai ehpn hgn t i l thilu I11,7 l l n so vdi he bang tai Ing thay vl bing tai thing bing tai thudng cung thygng thdng s l k9 thugt - Bing tai Ing dai hay ngan - Cung mdt ning suit vgn d i u cd Igi d|a hinh v | n chuyin v l d c thdng so ky ehuyen dec Dgc bidt sCr dgng thult khic, bing tai Ing phai cd r l t higu q u i d c gilng dp rpng t i i thilu Ion hgn 25% nghieng cd dp d i e Idn tu' 20° chilu rpng cua bang tai d i n 50° (dp d i e ma bang tai thydng, g l l tri trung binh thygng khdng su' dgng dugc) khoing 40% m l hign trygng hgp - Chi phi v | n hinh eao n l y d c md van sO' dyng toi dd, nang lugng I I v l n de chinh keo, dd, higg qua khdng eao Thdng thydng, dign nang tieu v l mCre dp mit an toln Idn thg de v|n hinh bang t i l Ing it - TuyIn dudng v | n chuyen nhlt eOng g i p 1,3 l l n so vdi vgt ligu khdng the chay thing bang t i l thygng cd cung thdng m l cd nhu'ng cho cong vygt s l ky thugt q u i kha nang uin cua bing tai - Bdn egnh dd edn ed c l e thygng v l n d l nhy tinh toan khd khan - Neu khing gian q u i ehgt KHCNM s d 7/2014* CO DIEN - T I J D O N G HOA hgp, bang t i l thydng cd kich thyde Idn hgn, dd, vigc sd' dgng bang tai I n g se phO hgp Khi ggp phai mdt nhyng trydng hgp ndi trdn v l d|a hinh dgt tuyIn bing, nlu dung bang tai thygng thi phai sCr dgng nhilu tuyIn bang nli zich z l e d l vgn chuyin LCic dd tuyen bang thygng se bj keo d l i , s l trgm din dpng, trgm keo d n g v l trgm euli eung d c thilt bj lien quan se tang Idn, l i m ting chi phi d i u ty N l u bd qua d c v l n d l ndu tren, c l e trygng hgp cdn lai thi bang t i l thydng v l n I I lya chpn hing d i u vi g l l thinh re hgn, dgn gian hgn treng thiet ke, c h i tgo l i p dgt Hign v l treng tyong lai, T i p dnIn Cdng nghigp ThanKhnlng san Vigt Nam dang v l se phit triln mpt elch mgnh me San lygng khai thic ngly d n g tang, cing t i c vgn t i l d d c md h i m Id, Id thien ngly d n g Idn, ben egnh dd cdn ed d c dy I n phit trien md qugng bauxit, alumin, d e dy I n nhi m i y nhigt dign vdi nhyng yu dilm vygt trpi cua bing tai Ing, kha ning I p dgng da dgng phcng phu cua logi hinh nly, vdi yeu d u d n g cao v l bao vg mdi trudng, cdng suit v | n tai, dia hinh vgn chuyin, chic chan rang bing tai Ing se la mdt nhO'ng logi hinh can phai dygc yu tien nghien eCru tCr bIy gid, d l ed t h i c h i tgo v l I p dung rpng rli./ Tii ii^u tham khao 'Tai lidu ky thu$t md than' - Trung tam NIng lygng than Nhlt Ban (Jccai) A.E.W Fletcher - "Environmentally Friendly Enclosed Conveyor Systems" ... than tgi q u i trinh mCrc nhlt djnh, n l u mu''c keo khai thic ban d i u d i u su'' dyng n l y d i n d i n t i n g len, hogc phygng phip d l khai thac KHCNM SO 7/2014* CO Dl t N - Tlf D O N G HOA... Igi nhyng d khu s l u hogc khu vyc moi g thdi ky d i u khai thac ngydi ta v l n phai sCr dgng nd, nhyng nhO''ng dydng Id ehinh cOa d c md khai thic cd tinh quy md thi ndn trinh phyong phip than... dung cac logi thiet bj van tai hi$n dgi d i u quan tdm den sy anh hu-dng tdi mdi trydng Trong vdng hai mu-ai nam trd Igi day, tren the gidi, da thilt k l vd dp dgng nhieu kilu cau hinh bang tai