m^ KHOA HOC VA CONG NGHE MO J V A N DE QUY HOACH BAI THAI TRONG QUA TRINH KHAI THAC XUONG SAU QUANG APATIT KHU NGOI DUM, DONG HO GIAI DOAN DEN NAM 2020 TS VU DINH HIEU - Trwimg Bai hpc Md.Dia chat TS IMAI THE TOAN - Tdng cgc Mdi trydng, BpTNMT ThS LE HOANG - Cdng ty Co phan Tw van JMd dc dy dn khai thdc va c h l biln quf ng apatit hifn cua COng ty Apatit Vift Nam thufc Tfp dodn HOa chat Vift Nam (Vinaehem) diu gdp rit nhilu van d l khO khan v l cdng tae din biJ giai phdng mat bdng, dde bift khdu din biJ giai phdng mdt bang ddp dng nhu clu d l thai cua md Mot phdn nguyfn nhdn ehua cd quy hoaeh ddi hgn, trung hgn eho cdc khu vye d l thai cua cdng tde khai thde vd tuyin qufng Trong giai dogn tdi ngudn qufng apatit logi I din egn kiet, Cdng ty Apatit Vift Nam se phai khai thdc xuong sdu d l ndng cao san luyng qudng apatit logi ll tgi cdc khu vyc cgm md Cdc, NgOl Dum-DOng H i thi cOng tdc thai ddt da tgi md se cdng bdc thilt Bai bdo d l xult mgt djnh hudng nhdm tdng bude thdo gd khO khdn v l edng tde d l thai cho khu md C' Ting quan v l mo Apatit Lao Cai Md Apatit Ldo Cai thuge logi hinh md trdm tieh biln chit, dit da gom: Dd philn cacbonat-thgeh anh, cacbonat-xerixit, cacbonat-fenspat, dd philn mica-cabonat chda apatit Todn bg tfp dat da cua khu md duyc ehia thdnh cac tdng Cic San ky hifu Id KS Thd ty td dudi Ifn fren cd cdc tang sau: KS3,4, KSs, KSe, KS? vd KSg Cac ting chda qudng gim KS3,4, KSs, KSB vd KS7 Theo hudng thing ddng, ede ting KS duyc chia ldm ddi: Ddi phong hda hda hgc vd ddi chua phong hOa, phdn cdch gida ddi la dudng ranh gidi phong hda Cdc thdn qufng Apatit cO dgng via, dya vdo thdnh phdn vdt chat, vj tri phdn bo, dae tinh co ly vd cdng nghf qufng Apatit Ldo Cai duyc ehia ldm logi Cdc via qufng ed elu tgo don nghieng hofc uin nip phde tgp, dudng phuong kfo ddi theo hudng Tdy BdeDdng Nam vd edm song song vdi hudng v l DOng Bdc vdi gdc die thay d l i tu 15-80°, cd chd vTa cdm die ddng hofc t h l ndm dao CONGNGHl|PMi,Stf4-201S Maf ca( dja chat dac trung cua mo apatit Lao Cai •:• Quang Ioai I: vi'a quang ndm trung khap m tdng KS5 ddi phong hoa hda hpc Quang dac trung bdi cac td hop khoang vat cpng smh cua Apatit, thach anh, fenspat, mica Ham luyng P A cua quang dao dong td 28-40 %, chdt khdng tan 0,6-^31 % B l day than quang cung la b l day ting KSs dao dpng tu 0,5 m din 22 m, trung binh ti> 6^10 m Quang mem bd, cung f=2-^3; •> Quang loai II: Tdng KS5 ddi chua phong hda ddng thdi la via quang II, ndi each khac via quang II la phan keo dai cua via quang I ndm ddi chu-a phong hda Quang thupc loai cung, dd cdng f=8-^10, ham luong P^05 dao ddng 20-28 %; •:• Quang loai 111: Cac via quang III cung thudng trung khdp vdi cac tdng KS4 va KSs? nam ddi phong hoa Ham luong P2O5 trung binh dao dpng td 12 den 20 %, chilu day kha Idn tu vai met den vai chuc met Dp cung f=3-4; •:• Quang loai IV: Via quang IV ndm tdng KS4 va KS6,7 ddi chua phong hda Quang co cau tao dac xit va cdng chdc, ham luong P^Os dao dpng den 10%, Do dac tiiu cau tao cua quang apatit Lao Cai, hien nhieu khai trudng mac du da khai thac tip nhung nam 60 cua thl ky trudc nhung hien KHOA HOC VA CdNG NGHE MO _ m ^ van dang tin tai vi mdi kit thdc khai thdc qugng apatit logi I vd logi III, eOn tdi nguyen, tru luong qufng apatit logi 11 vd logi IV vdi fru lyyng tuong dli Idn vdn chua khai thdc Nguyfn nhan trudc ddy Lien Xd giCip Vift Nam lgp lufn chdng kinh t l k? thuft, cung nhu thilt k l khai thdc ehi tinh din ranh gidi phong hda, tdc la chl khai thde quang apatit logi I va logi III di kem, ding thdi nhu eau v l qufng apatit cung nhu eOng nghe c h l biln frong giai dogn trudc chua cho phep Diln hinh la cum khai trudng khu Md Cdc vd cym khai trudng khu Ngdi Dum Ddng Ho, v l co ban da khai thde hit qufng logi I vd logi 111 Trong giai dean tdi nhu eau thj trudng qudng logi 11 tang cao dot biln, theo quy hoach tham dd, khai thdc, c h l biln vd su dung qufng apatit din nam 2020 ed xet din nam 2030 da duyc Thu tudng Chinh phu phf duyet tgi Quylt djnh s l 1893/QD-TTg ngdy 20/10/2014 nhu cau qufng apatit logi ll tdng dot biln, khu vyc Ngdi Dum DOng HO cdn huy dgng td 295 ng.tdn/nam din 1.300 ng.tdn/ndm Nhu vfy, cOng sudt huy ddng cua cum khai trydng giai dogn tdi se tang ^ lan so vdl hien tgi Dgc dilm khal thac mo khu vu>c Ngoi Dum Ddng Hd Khu vye Ngdi Dum Ddng Hd bao gim cdc khai trudng 13, 14, 15a vd khai trudng 15b, v l ey ban da kit thue khai thdc qufng I, qugng III Qugng va III chu ylu cdn lgi phan ldn dudi ldng suli NgOi Dum Hifn tgi khu mo cdn lgi ehu ylu quang logi ll vd logi IV thugc tdng KSs cOn tilp tgc cdm sdu vdo lOng dat tdi df sau 10 khoan bdt gdp thdn qufng gdn -500 m, nhien kit qua chuyin dli cap trd luong theo Quylt dinh s l : 152/QD-HDTLKS/CD, ngdy 30/5/2011 eua Hdi ding Trd luyng khodng san, fru luyng va tai nguyen qugng logi ll la 22,4 fr.tdn, edt tinh trd luyng td mdc + 40 m trd len Khai trudng khu Ngdi Dum-Ddng H i Lien XO thilt k l khai thde qugng I Ill vao nam 1974 va hifu ehinh vdo nam 1981 Theo thilt k l cua Lien XO ddy khai trudng khai thae qugng I ddng d mdc ranh gidi phong hda hOa hgc, song tren thyc t l d khu NgOi Dum DOng H i da duyc Cdng ty Apatit Vift Nam khai thde sdu hon dudi mdc phong hda hda hgc va da ldy duyc tren trieu tdn qudng 11 (tinh din 31/12/2014), nen dilm ddng ddy mo hifn tgi noi sdu nhdt Id khai trudng 15A d mdc: +80 m, khai trudng 15B mdc + 227 m va khai trudng 14 d mdc +145 m Bd khai trudng phia trg cO cao dilm dd cao ldn nhdt +355 m Id khai trudng 15B Muln khai thac xulng sdu hon nua bit budc phai eai tao gin nhy suit chilu ddi bd trg d l dam bao an toan cho ngudi vd thilt bj ldm vifc H.2 Mdt s6 hinh dnh hi$n trpng bSi thii khu vyi Ngdi Dum-Ddng Hi: a - Khu vyc hien trang m$ bdi thdi khu Ngdi Dum-Ddng Ho; b - Khu vyt hien trpng thdi theo di^n tich khu Ngdi Dum Ddng Ho; c - Mot goc tang thai khu vuc Ngd Dum Ddng Hi Phia DOng Nam khai tardng Id dudng td tnj dudng d td khai trudng duyc ndi vdi dudng tnjc d < eao +133 m dli vdi khai trudng 15A, +180 m dli v khai trudng 15B vd +160 m doi vdi khai frudng Cde thung lung phia bd vdch va bd tru khai trudi gdn nhu diu duoc su dgng ldm bai thai ddt dd: • Bai thai s l KT 15 (KT15_N°1) Bdi b l giap bd vdch phia DOng khai trudng gidi hgn MC 22b din MC 24b, dat da trum len via Qudt ll, Qugng IV, hifn tgi cao dg mgt bdi +200 m, c; dO chdn bai +140 m, difn tich ddt sd dung 25,6 h Khdi luyng dat da bai 2,8 trieu m^ Khi kh tnfdng khai thae xudng sau, bai phai di ddi m phdn difn tich; C0NGHGHltPMi.Stf4-2015 ^^_ KHOA HOC VA CONG NGHl MO 3.1 Cas&tinh toan Thuft todn t i l uu hda nhdm tim trinh ty d^ thai hyp ly vd dgt hifu cao cho cdc md 6" ddy, dfi tuyng nghien cdu Id hai cum khai tnj-dng khai thSc If thifn khu Ngdi Bum-DOng Ho Hien ede m6 da khai thdc td nhdng nam 60 eua thf ky XX, cdrf tdc d l thai ehua cO nhdng quy hogch hyp ly cho tdng khai trudng, cgm khai tn/dng vdi nhdng bSi thai Chung, bdi thai rieng, bdi thai duyc giai phdng theo tdng gial doan nfn vife giai bdi todn tli iru hOa qud trinh vfn tai khdng h i don gian Mft bdi todn tli mj hod quy hogeh thai ddt dd mS lg thien duyc lufn giai can cd vdo nhdng co sd sau: | •:• Quy hogch san xudt, bdc dit vd thai thdi cdc phuong dn tuong dng vdi s l luyng bdi thai tjS thl dua vdo quy hoach d tdng giai doan Cdc giai dogn duyc phdn chia phu thudc vdo s l luyng edng trudng vd s l luyng bai thai; Giai phap thai hvp ly khal thac •:* Khii luyng dit da can d l thai cua tdng md, a qufng apatit loai gial doan d i n nam 2020 cde eOng tardng theo tdng cOng tac d tung giai dogn; • Dung tieh vd thdi dilm eO t h l d l thai *:• San luyng khai thdc qugng II theo nhu clu ,tdng td 295 ng.tan/ndm din 1.300 ng.tan/nam, td tdng giai dogn cua cdc bai thai; dd cd thl thay,khoi luyng ddt dd bde cdn dd thai