Thong tin khoa hpc cong nghe mo I MOT SO GIAI PHAP CONG NGHE KHAI THAC CAC MO OUANG SAT LO THIEN CO DIEU KIEN DIA CHAT PHllTC TAP AT VIET NAM In the cause of "industrialization modernization" the iron[.]
Thong tin khoa hpc cong nghe m o I MOT SO GIAI PHAP CONG NGHE KHAI THAC CAC MO OUANG SAT LO THIEN CO DIEU KIEN DIA CHAT PHllTC TAP AT VIET NAM In the cause of "industrialization - modernization" the iron ore mining industry has played an important role So far in Vietnam, ''"S- ^^^ ^^^ ™}{^,, 216 iron ore mines and mine sites with f/ie/rreservesand natural ^'^" ^'^°^ ^^^ ^°"3 nghd Md - Vinacomin resources of nearly 1,2 billion tons have been discovered and Bien t$p: TS Truvng DOv Dw planed According to the planning, some iron ore mines with be invested for their expansion, while some mines will be newly invested Open pit iron ore mines in Vietnam have complicated geological conditions Most of the mines have to be exploited at deep mining depth, below the level of free water drainage in complicated geological and geohydroiogiccal conditions, the ore bodies have strongly varied in each area and each mining level Therefore, for increasing the output of the imn ore mines in the coming time to meet the requirements form the national economy, the mines need to be improved and the mining equipment and technology have to be innovated Hign trgng cong tac khai thac quang sit Hien tgi, cdc mo sat qugng nude ta chu y i u khai thac qudng eluvi-deluvi, m$t so md budc d i u khai thac qugng gie San lugng eua mgt s i md nhu: Trai Cau, Ngudm Chdng, Kip Tudc, Quy Xa dgt tu lOO-^-IOOO ngan tin/nam, md Thach Khd dang d thdi ky xdy dgng eg ban [2] C6ng nghg va thiet bj khai thac d muc trung binh, m$t s i thiit bj khai thdc cQ va lac hdu, ndn cdng suit khai thac bi hgn c h i va khdng dam bao theo cde dg dn duge phd duydt Cac md dugc d p giay phep tan thu thi hau nhu khong cd thiet ke, hogc ed nhung khai thac khdng theo thiit k i Vi chay theo Igi nhugn trudc mat, cdc doanh nghigp khai thdc tgn thu da lam t i n thit tai nguydn va lam suy giam moi trudng nghiem trgng Thiit bj su dyng cac khau cong nghg Cae mo khai thde quang gie, cdng tde lam toi d i t dd vd qudng dugc thuc hi$n bing phugng phap khoan no (KNM) Thiit bj khoan tai cac md cd qui md Idn la may khoan dap cap (D = 200mm), mgt so md su dung may khoan dap xoay cd dudng kinh nhd Mdt s i md mdi dw(}fc d i u tu thiet bj khoan xoay dap KQG -165 (D = 165mm), mdy khoan thuy Igc ECM-6 (D 105mm) Thiit bj xuc b i c su dyng chu yeu MXTLGN (E = 0,8-^4,0m=') kit hgp vdi dtd tai trpng 15-5-40 tin Quy hoach phat trien nganh khai thdc quang sit Theo Quy hoach phdt triin ngdnh khai thac quang sit da dugc Thu tudng Chinh phu phe duygt vd du an d i u tu cua cae mo, san lugng cua nhidu md se dgt tu 100-^-10.000 ngan tan/ndm [1] Thuc hidn k i hogch khai thdc tren, cac md dang trien khai ding bg cde giai phdp dd tang san lugng Tuy nhien, vdi dieu kidn khai thdc cua cac md qugng sat 16 thidn Viet Nam thudc loai khd khan, phuc tap, nhung d i n chua hinh cdng nghg khai thde rd net dieu kign cua mdi md, ddc bigt doi vol eac md ed dieu kidn tu nhien va DCTV phuc tgp Vi vay, 6k dap ung ydu eiu san lugng theo ke hogch da de ra, c i n thiit phai nghien euu, lua chgn edng nghd khai thac phu hgp vdi didu kidn cua tung md nhu: Khai thdc vdi gde bd cong tac ldn, cong nghg ddo sau day md, khai thac chgn Igc, thiet bj xuc bic - van tai hgp ly Phan logi cac mo quang sit theo diiu kien tM* nhien va ciu true dja chit Doi vdi md quang sat Id thien, diiu kign DCTV va dja chit cdng trinh cua cdc md dugc xac djnh bgi cac y i u to: Cau true dja chit, hinh dang va t h i nam thdn quang, muc dp sung nude md, tinh chit co Iy cua qugng vd dat da vay quanh, dia hinh - dja mao, dgc diem thuy van nude mat vd quan hg eua nd vdi nude nglm KHCNM S6 12/2015 * CNKT LQ THIEN Thong tin khoa hoc cong nghe md cung nhu dg sau va phuong phap khai thdc, Theo muc dg phuc tap ve dieu kign tg nhien va DCTV cae md quang sat dieac phan nhdm [2]: Nhdm - Dan gian: La nhung md c6 mo hinh eiu true ^ a chit don gidn, gom mgt ddi trdn nin dd goc cung hay khoi tang, khii tang - uin nip, it bj ehia cat boi eac dut gay kiin tao Than quang nim eao hon goc xdm thgc dia phuong Cae than quang nim ngang, thoai vdi gdc die y < 25° Chieu day va chit lugng qugng tuong doi on djnh Nguon nude chay vao md nhd hon 2000m^/h, dp luc nude len try vfa dudi 50m D i t da vay quanh on djnh, sue ben eo hge eao Cd t h i khai thdc bing phuong phap thdng thudng (gom hiu hit cdc md Quy Xa, Ldng Vinh-Ldng Co, Sang Thin va cac md quang sit sa khoang) Nhdm - Phi>c tap: La nhung md co mo hinh ciu trCic dia chit phue tap dgng tuyen, khii tang, khii tang - uin nip ndng syt khong diu, bj biin dang manh bdi cae hoat dgng uin n i p vd dut gay Than quang nim eao hon gie xam thuc khu vgc Cac than quang ed gdc doc tu y = 25-^-45° Nguin nude chay vao md tu 2000-^5000m^/h, dp Igc nude Idn try via tu 50-^100m D i t dd vay quanh ni>a cipng - mem, kem on djnh, sue ben CO hgc thap Phai dp dung cae bi0n phdp gia c i , bao vg cdng trinh khai thdc nhung khdng qua phde tap (gom eac md Lang My, Tien Bg, Ldng Thdp, Kip Tudc, Thanh Ky, Thanh Tdn, Tung Ba, Nd Lung, Thiu Lung, v.v ); Nhdm - Rat phu-c tap: Ld nhung md cd md hinh ciu triJc dja chit hit sue phi>c tgp dang khoi tang va khii tang - uon nip, bj phan dj rdt manh bdi c^c dut gay Than qudng nam sau hon gie xdm thuc khu vgc Cdc than qugng thugc logi die nghieng vd doc dung y > 45°' chiiu ddy Bing1 Quan he giQa cic Chieu cao tang h vdiVs h tang Vs glim (%) (%) 33,33 24,38 vd chit lugng quang rit khing i n djnh Nguon nude chay vdo md Idn hgn 5000 m^^, dp luc nude Idn try vfa ldn hon 100 m D§t dd vay quanh rit kem on dinh Phai dp dgng edc bidn phap dac biet d i thao khd md va bao vd cdng trinh khai thac, rat kho khan va t i n kdm (gom eac md: Thach Khd, Na Rya, Trgi Cau, v.v ) Dga vdo cdch phdn logi tren la ca sd khoa hgc d i Iga chgn cong nghg khai thdc hgp 1^, nham dam bao higu qua kinh t i , an todn khai thdc, tan thu tai nguyen Mpt sd giai phap cong nghe khai thac hgp 1;^ ddi vd'i cac mo quang s i t Ig thien co didu lc mdy dung ^SLA i KV "• - - - | l - " : * " ' i ' ' " " " ' " Hinh Bo thi quan hd giua chi phi sin xuit ciia MXTLGN v&i dung tich giu xQc khai thic thin quing ddc ddng cO ciu tao phOo tap 1,2,3,4- tuang iing v&i chiiu cao ting xdc: 4; 5; 7,5; 10m; a, Khi xiic dit di; b, Khi xdc qu0ng; C, d- xdc guong hdn hop (C- guong hin hop 1/3 qudng vi 2/3 dit di; d- guang hdn hop 2/3 quing vi 1/3 dit di; C-1,d-1 tuang &ng v&i guang xdc thin qudng; C-2, d-2 tuang Ong guang xdc thin qudng); miy xdc chit tii ldn itd cdng miic miy d&ng;— miy xdc chit tii idn dtd du&i mdc miy ddng KHCNM S6 12/2015 * CNKT LO THIEN Thong tin khoa hpc cong nghe m o C1ff**»>-^ C-Z C-3 Hinh Dd thi quan hi giOa chi phi sin xuit cda MXTLGN v&i dung tich giu xdc khai thic cdc thin quang ddc nghidng cd du tnic phOv tap 1,2,3, 4-Tuang dng v&i chiiu cao ting xdc: 4; 5; 7,5; 10m; a, Khi xdc guang quing; b, C-Khi xdc guang hdn hop (b- guong hdn hop 1/3 quing vi 2/3 dit di; C- guang hdn hpp 2/3 quing vi 1/3 dit di; b-1, C-1 tuong ung v&i guang xuc thin quing; b-2, C-2 tuang dng guang xuc thin quang; C-3 guang cd thin quing); miy xuc chit tii lin dtd cdng mdc miy ddng;— may xuc chit tii len dtd du&i miic miy diing Tuy nhien, gdc nghieng bd cdng t^e edn phu tai len dtd du'di mire may dCrng cd ehi phi thip thupc vao cdng suit thilt bj xuc bee va van tai, hon so vdi chat tai eiing mu'c may dCrng, vi vay, so dd edng nghe bdc d i t tren bd md, nen gdc treng mpi trudng hop can u'u tien chit tai len dtd nghieng bd cdng tac ludn phai thda man di4u du'di miic mSy airng ki$n: K i t lu$n