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Thong tin khoa hoc cong nghe mo NGHIEN CUU LUA CHON THIET Bl XUC BOC VAN TAI HOP LY Cho cac mo sat lo thien co dieu kien dja chat phuc tap I Basing on the analyzed mining conditions at the open pit li[.]
Thong tin khoa hoc cong nghe m o NGHIEN CUU LUA CHON THIET Bl XUC BOC - VAN TAI HOP LY Cho cac mo sat lo thien co dieu kien dja chat phuc tap I Basing on the analyzed mining conditions at the open pit liron ore mines in Vietnam including geological,, i ThS LUU VAN THJC I hydrogeological and engineering geoteehnical conditions, ] KS DJONG TRUNG TAM \ the paper suggests the suitable selection of the loading [ Vien Khoa hgc Cong nghe Mo-TKV t and hauling equipment such as excavators, hydraulic back • L- hoe shovels and specific trucks for removing soft rock, ] hard rock and iron ore s well The paper also providesJ^ technical and economic analysis for each selection Dac diem khai thac cua cac md Dae diem chung cCia cac md quang sat cau tao dang via khai thac Id thien nudc ta ed dieu kien kie'n tao cung nhu dia chat thuy van, dja chat edng trinh phufc tap Ca'u tao dja tang cac md gdm: - Tang phCi phia tren thudc loai tang da't ye'u: Cac md nhu Thach Khe, Trai Cau, Na Rua v.v cd tang phCi la da't da de tCf, cat, set, cat pha set va nedgen Dae diem chung cCia tang da't yeu d cac md la cd chieu day de'n vai chuc met, dac biet md Thach Khe cd chieu day thay ddi tCf 26+227m Tang da't yeu d cac md cd am cao (15-^36%), trgng lugng the tfch tCf 1,7 -^2,0 ta'n/m^ he sd xdp thay ddi tCf 0,37+1,1, gidi ban ben nen nhd, phd bien tCf (?„= 0,06-1,32 kg/cm^, gdc ndi ma sat d trang thai ty niiien nhd, tCf 6^-32°, Iyc dinh ke't nhd, tCf 0,4+1,7 kg/cml - Tang ehCfa quang thudc loai tang da cCfng: Tang gdm eac loai da nhu Gabro, da vdi, da sCfng v.v Dac diem chung cCia cac loai nham thach tang cd kien cd Idn, f = 9+11, trgng lugng the tfch Idn, tCf d = 2,7+3,1 t a n W , phan khd'i Idn, dja tang hinh cae hang kastg Quang khai thac cd kien cd Idn, f = 11+15, phan khd'i Idn, ft nCit ne, trgng lygng the tfch Idn, d = 3,7+4,4 tan/ml Cac nham thach vay quanh than quang thudng cd cac hang kastg, day la ye'u td tao dieu kien cho nude ngam chay vao khai trudng Idn hgn so vdi cac md than Id thien Theo cac tai lieu dia chat, nhieu md cd luu lugng nudc chay vao khai trudng Idn nhU: Thach Khe, Na Rua, Tung Ba v.v Md Thach Khe cd luu lugng nudc chay vao dy kie'n khoang 3,1 trieu m^/ngay.dem (khi dat de'n sau -400m), md Na Rua cd lyu lugng nudc chay vao tCf 95^169.10^ m^/ngay.dem Cac ye'u td dja chat thuy van, dja chat cdng trinh tren da anh hydng Idn den viec lya chgn ddng bd thie't bj cung nhy cdng nghe khai thac cua cac md De nang cao hieu qua khai thac va dam bao an toan eho eac md quang sat Id thien cd dieu kien dia chat phCfc tap, can thie't phai lya chgn ddng bd thie't bj khai thac hgp ly KHCNM SO 8/2010* CNKT LO Nghien ciru lya chon THI£N thiet bj xuc boc - van tai hdp ly cho cac md quang sat 2.1 Lua chon thiet bj xuc bdc Trong ddng bd thie't bj khai thac thi thie't bj xue bdc thydng dugc lya chgn dau tien va dyde coi la thie't bi ehu ye'u cCia day chuyen cdng nghe vi nd chiem den 60% gia san pham Thie't bj xue dygc lya chgn tren eg sd: + Qui md san xua't (san lygng quang, khd'i lugng da't bdc) + Dieu kien md dja chat (chieu day, san trang cua than quang va da bdc, kfch thydc va hinh dang khoang sang, dja hinh md, tfnh chat cd ly ciia da't da) + Cae ye'u td ky thuat cdng nghe md + Gia khai thac tan san pham Dd'i vdi cac md ed dieu kien dja chat thuy van, dja chat cdng trinh phCfc tap nhu Thach Khe, Trai Cau, Na Rua v.v , viec lya chgn thiet bj xuc bdc hgp ly' ed vai trd quan trgng de'n kha nang hoan san lygng cung nhy dam bao an toan qua trinh san xuat Thong tin khoa hoc cong nghe m o Kinh nghiem ciia cac nha khoa hgc md deu nhan djnh rang: Thie't bi xuc bdc bang may xuc thuy Iyc dugc yu tien lya chgn cho cae md ed dieu kien thuy van, dja chat cdng trinh phCfc tap, nen da't ye'u, via mdng, ca'u true phCfe tap, khai thac chgn lgc, nhifng ngi khd khan ve ngudn dien, de ngap lut cd mua bao Ddi vdi eae tang da't ye'u, ap lye CLia may xCic len nen tang cd y nghTa quan trgng lya chon loai may xuc ap lye len nen may dCfng dugc xac dinh theo bieu thCfc sau: A^ = Qv 26,(/, +0,35/2,)' kg/cm^ (1) Q„ = (Q,, + Q,,).Ku, kg (2) Trong dd: b,N'^ tuyen cdng tac tren ta't ca cac tang bang va sd tang tren cac nhdm bang nhau, hay la khdi lygng md tren cac nhdm Qn= ^T-T; ,m/nam (6) tang bang nhau, sd may xuc can thie't Trong dd: A - San lygng quang nguyen khai cua hoan khdi lygng da bdc la: N^ = 2m md, tan/nam; Vj- Tdc xud'ng sau, m/n; M- Chieu Khi dd dung tfch gau td'i thieu can thie't day trung binh than quang, m; Lq- Chieu dai trung ciia may xuc sii" dung la: '"''' binh than quang, m; K^^ - He sd bdc san xua't, m^/t; Qn- Nang sua't nam cCia may xuc, m%am; E- Dung Vs-L^r^rYr^sx-Tck-Kr tich gau xuc, m^; K,g - He so sCf dung thdi gian ca E^ ,rvr (8) cCia may xuc; K^d - He sd xue day gau; Nca- So ca lam viee nam; Tea- thdi gian lam viec ca, c Trudng hgp 3: Tren mdi nhdm tang gid; K^n- He sd anh hydng cdng nghe qua trinh bo tri may xuc lam viec (hinh 3c) xCic; Tck- Thdi gian chu ky xue, s Trong trudng hgp nay, dung tfch gau td'i TCr eac cdng thufc tren cho phep xac djnh dung thieu can thie't cCia may xuc cd gia trj Idn tfch gau ciia may xue nhy sau: nhat va dygc xac dinh theo cdng thCfc: Sd may xCic can thie't de xCic da't da tren toan bd edng tac cua md dyde tfnh nhy sau: a a £ =m J 36Q0N^,.T^^.K^,.K,^.K^„.Y^^ -,m^(7) m" Gia SLf vdi cae ye'u td khac khdng ddi, dung tfch gau xuc trudng hgp phu thudc vao chieu dai than quang, chieu dai bloc may xuc va trgng lugng rieng cua quang: - Khi: 4, -^ thi N^, -^ max dd E ^ - Khi: L^ -> max thi N^- ->• dd £ -> max Do vay, dung tieh gau xue hgp ly cCia md bd tri ke't eau bd cdng tae trudng hgp phai nam trgng gdi ban: E^i^ 4m^ a = E