KHOA HOC VA CONG NGHE M O
KET QUA NGHIEN CUU DIEU CHE HON HOP THUOC TUYEN
DE TUYEN NOI BUN THAN
CUA CONG TY TUYEN THAN HON GAI-VINACOMIN
TS. PHAM V A N LUAN; ThS. LE VIET HA - Trwdng Dai hge Md-Dja chat KS. VU TUAN LIUH-Cty Tuyin than Hdn Gai-Vinacomin Hoc vien N G U Y I N V A N M\NH-Cty Co phan Giam djnh-Vinaeomin
V
do ndm 2010, Cdng ty tuyin than Hdn Gai da ldp dat day chuyin tuyin ndi cdt d l tuyen than ' d p hat-0,1 mm vdi ndng suit khoang 500.000 tan/nam. D l tuyin ndi bCin than phai su dung thulc tuyin nli. Nhung hidn nay, nha may hoan toan phai nhgp khdu thude tuyin nli tiJ nud'c ngpai vai gia thdnh cao. Vi vdy, chi phi cho ddy chuyin tuyin noi bCin than tai nhd mdy tdng Idn ddng k l . Bai bdo nay gidi thi#u kit qua tuyin noi bun than Hdn Gai trong phdng thi nghidm vai hon hp'p thudc tuyin mdi dilu chl, md ra kha nang thay the thuoc tuyin nhdp khdu bdng thudc blng thulc tuyin trong nudc san xudt nhdm giam sy phu thupc vdp ngudn thudc nhdp khiu cung nhu giam ehi phi cho qud ti-inh tuyin ndi bun than tgi Vi$t Nam.1. Cac loai thudc tuyen d l tuyen noi bun than
• Thuoc tip hop'- Tuyin nli than cung giing nhu bit ky qua trinh tuyin nli bpt khac, diu phai su dung thudc tuyin. Thulc tgp hp'p d l tuyin than la cac loai hydrocacbon dup'c c h l biln tu d i u md nhu: diu hoa, d i u diezen, diu mazut...
• Thudc t90 bot Trudc kia hay dung cresol vd xylenol d l Idm thuoc tgo bgt trong qua trinh tuyin than, ngay nay ehung dug'c thay t h i bang aliphatic alcohol (rug'u bdo) hoac polyglyeol
' • Thuoc on dinh nhQ twang: Thude tdp hg'p dung trong qud trinh tuyin ndi than Id ioai khdng tan trong nud'c vd dug'c dung d dang nhu tuang, vi vgy phai nhu hoa thuoc tap hap trudc khi d p vdo mdy tuyin. Di dly nhanh qua trinh nhu hda thudc tgp hg'p va dn dmh trgng thai nhu tuang cua hdn hap thudc, ngudi ta da su dung cdc hg'p chit hogt ddng be mdt. Ddy la ly do chinh cho viec su dung cdc chit hogt hda trong qua trinh tuyen ndi than.
MOt so thulc on djnh nhQ tuang thud'ng dung: axit bdo polyethoxylate; nonyl phenol polyethoxylate va
h6n hg'p cdc logi rug'u beo vai alken...
Ngodi ra, trong qua trinh tuyin n l i bim than cd t h i su dung them cac loai thulc de chim vd dilu chinh mdi trud'ng.
2. M l u nghien ciru va t h i l t bj thi nghiem 2.1. Mau nghien cwu
Mlu nghien cuu la than bun cua Cdng ty Tuyin than Hdn Gai, ddy Id logi than dang dup'c nhd mdy tuyin blng phuang phdp tuyin nli, tinh chit cua mau neu trpng Bang 1.
Sang 1. Tinh chitcOa miu thi nghidm cip hat, mm
+0,2 0,1-0,2 0,074-0,1 0,04-0,074 -0,04 Cong
Y,%
2,2 11,11
0.44 14,37 71,88 100,00
A, % 47,29 9,89 22,9 10,73 42,69 34,47 Tu ket qua phdn tich tinh chit cua mdu nhan thay:, --
• Dp tro trung binh cua mdu vdo khoang 34 %.
Trong mau nghien CLPU phdn Id'n la d p hat -0,04 mm (chilm ty 1$ 71,88 %), day la cap hat rit min khd khd tuyin. Cdn d p hgt +0,2 mm chiem mdt t/
le khdng ddng ke
• Dg tro cua mdu nghien cuu phan b l kh6ng diu thep tung d p hat hep md chi tap trung vao hai d p hat Id'n nhit va nhd nhit, day Igi la hai d p hgt khd khd tuyin noi.
2.2. Thiit bj va dieu thi nghidm
Thiit bi thi nghi$m: ii miy tuyin noi ca gidi Denver cua Due cd dung tich Id 1 lit va 3 lit.
CONG NGHIEP MO Sd 5 - 2 0 1 3
innuH nub t n SONG NGHE MO
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Diiu ki$n thi nghiem: Cdc thi nghiem dup'c tuyen mdt lan duy nhdt tren may tuyin noi phdng thi nghidm. Cac dilu ki^n thi nghiem khdc nhu sau: d p thuoc 1 ldn; dung tich ngan may tuyin ndi blng 1 lit; thd'i gian khuly tilp xuc: 3 phut; thd'i gian gat bpt: 5 phut
Cich xu ly so lieu: cac san phim than sgch va da thai cua tCrng thi nghiem dup'c sly kho, can xac djnh trpng lup'ng mlu va lly mdu phdn tich dg tro Hi$u qua tuyin eua qua trinh thi nghiem duac ddnh gia thdng qua cde thdng s l sau: than sach ed dO tro (A) nhd han 15-17 %, ddng thd'i cd thu hogch (y) vd thue thu (e) chip nhan dugc. Da thai cd do trp tren 80%.
3. K i t qua thi nghiem
3.1. Ijwa ehgn hon hgp thuoc tuyin mdi dieu che Thulc tap hg'p d l tuyin than Id thudc tdp hg'p khdng cyc, khdng tan trong nudc. Vi vay d l giam chi phi thulc trong qua trinh tuyin nli biJn than, thudc tdp hg'p dup'c dung d" dang nhu tuang.
Trong qua trinh tuyen noi bun than phai chudn bj h5n hp'p thulc tuyin d dang nhu tuang d l su dung true tiep. Hon hap thulc ndy bao gIm thudc tap hap, thulc tao bot va mdt phin nhd hap chdt on dinh nhu tuang.
Ldn lup't phoi trdn cdc loai thulc tap hap, thude tgo bot, vd cdc chit phu gia khac d cdc ty Id va thai gian khuly tgo nhu tuang khac nhau. O moi ty le vd thdi gian khuly nhit d|nh se tao ra mdt hin hap thulc tuyin. Sau dd lam thi nghidm tuyin nli lan lup't vdi tung logi h6n hg'p thuoc tuyin da dilu chl d l tim ra hon hp'p thulc tuyin t l i uu. Dya vdo kit qua thi nghidm da tim ra dug'c 6 loai hon hop thulc tuyin tit nhit la A l ; /\2; HI; H2; H29; H30.
Kit qua tuyin vdi 6 loai thulc tren a cijng chl dg- chi phi hon hp'p thulc 1200g/t va ning dp pha ran cua bun tuyin nil 10Og//, duae t h i hien d H. 1.
H.l Biiu di mieu ti si/ phi,i thudc cua thu ho^ch, thi/c thu vi dd tro than sgc/i vio cic lo^i hdn hop thuic tuyin mdi diiu chi
Sau mdt thd'i gian nghien cuu nhan thdy cac thudc tuyin A2, H2 va H29 cho kit qua tuyin tdt han va I n dinh han cac loai thuoc khdc. Sau khi da tim dup'c ba loai hdn hp'p thulc tuyin trdn da tiln hanh nghien cuu cac thi nghiem dilu kien sau:
<• Thdi gian I n djnh nhu tuang cua hdn hap thulc sau 10, 20 vd 30 ngay;
• Thi nghidm xdc djnh ndng dp pha rin t l i uu cua bCjn tuyin nli;
• Thi nghiem xac dinh ehi phi t l i uu cua hdn hap thulc;
• Thi nghiem gat bgt phdn doan va d p thude phan doan.
Tu cdc thi nghiem tren da tim ra dug'c cdc dilu kien tdi uu nhu sau:
• Sau khoang thdi gian 30 ngdy cac hdn hp'p thulc tuyin tren vdn I n djnh,
• Ndng dp pha rdn cua bun tuyin ndi tli uu khi tuyin vdl hdn hap thudc A2 vd H2 Id 80-^120 g/l, edn khi tuyin vdi thulc H29 Id 80-220 g/l;
• Chi phi hon hp'p thudc tuyin A2 va H2 tdi uu Id 1000^1200 g/t, cdn thudc H29 Id 600H^1200 g/t
• Tai gia tri tli uu tren thu hoach, dp tro vd thye thu cua than sach khi tuyin vdi thudc tuydn A2; H2 va H29 lln luot la: 74,49 %; 15,55 %; 95.24 % va 74,59
%; 15,65%;95,54%vd75,12; 15,19;95,7% _
•> TCf cac thi nghiem tren nhan thiy thulc H29 cho kit qua tuyin tdt nhit.
3.2. Kit qua thi nghidm so sinh vdi thuoc tuyin nhap khau
Di cd t h i xdc dmh tinh hi$u qua cua hdn hap thudc tuyin mdi chl tao so vdi thuoc tuyen cua QiJic va Trung QuIe (TQ). Da tiln hdnh thi nghiem tuyin nli trong phdng thi nghiem vdi eac loai thulc tuyin mdi dilu chl A2, H2, H29 vd thudc tuyin nhap khdu d cung dilu kien thi nghiem. Kit qua thi nghiem vdi cac loai thulc tren d cung dilu kidn: chi phi hon hp'p thulc 1200g/t; ndng dd pha rin eua bun tuyin nli lOOg//, duae t h i hien d H.2.
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H.2. Bleu dd miiu ti si/ phy thudc cOa thu hoach, thi/c thu vi do tro than sgc/i vio cic to^i thuoc tuyin
CONG NGHIEP MO 8^5-2013
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KHOA HOC VA CONG NGHE MO TCr k i t thi nghiem nhdn thiy: O cCing chi phithudc tuyin va ndng dp pha rdn cua bun tuyin nli, thi hieu qua tuyin cua cac loai thudc tuyin nhdp khdu va ba hdn hp'p thudc dilu c h l dup'c khdng khdc nhau la mdy. Thdm chi k i t qua tuyin cua thulc md'i dilu c h l cdn cd mot so chi tieu t i t han thulc Trung QuIc mgt chut.
4. K i t lugn
• TCf mlu bun than ban ddu co dp trp tren 33
%, sau khi tuyin blng hdn hp'p thulc mdi chl tao da thu dup'c san phim than saeh cd dp tro tCf 15-H17 %, vdi thu hoach vd thuc thu than sach tin lup't Id tu 74-^77 % va td- 94-=-95 %. Ddng thdi dd thai cd dp tro tren 80 %, cd t h i thai bd.
• TCF kit qua thi nghiem da tim ra dugc chl dp cong ngh$ tuyin t l i uu vd'i hai hdn hap thulc tuyin A2 va H2 la: chi phi hdn hgp thulc 1000-5-1400 g/t; ndng dp pha rdn cua bCin tuyin nli 80-^120 g/l. Con dli vdi thulc H29 la: chi phi hdn hgp thulc 600^1400 g/t; ning dp pha rdn cua bun tuyin nil 80-5-220 g/l.
• Thi nghiem so sanh giCfa cdc logi thudc tuyin md'i dilu chl so vdi cac loai thuoc tuyin nhap khiu eho kit qua tuang duang, thdm ehi hon hgp thudc mdi dilu chl cdn cho mdt sd chi tieu tdt ban so vd'i thuoc Trung QuIc.
•> Kit qua thi nghiem cho thiy thudc H29 ed hipu qua tuyin tit nhdt va hoan todn cd t h i su dgng vao thyc t l san xuit. Do vgy, cd t h i tiln hdnh trien khai thu nghiem thudc H29 trong dilu kien thyc t l tai Nha mdy tuyin than Hdn Gai d l ed t h i khing djnh duge hieu qua tuyin cua thudc.
• Thdnh phin chinh cua thudc H29 Id ddu hda, d i u diezen, rugu beo vd mdt phdn nhd chdt phu gia khac nen se khdng gdy ddc hai ddi vdi ngud'i su dung niu chip hdnh dung quy t i c an toan khi pha chl.
• Thulc H29 ed gia thdnh re han khoang 10 % so vai thudc nhdp khiu tCf DLFCO
TAI LIEU THAM KHAO
1. Janusz S. Laskowski (2001), Coal Flotation and Fine Coal Utilization, Elsevier.
2. Renhe Jia, Guy H. Harris, Douglas W.
Fuerstenau, (2002), Chemical Reagents for Enhanced Coal Flotation, Coal Preparation, Vol.
22, PP123-149
3. M. Polat, H. Polat, S Chander, (2003), Physical and chemical interactions in coal flotation, Int J. Miner. Process, Vol 72, pp 199-213.
4. G. H. Hams a; Jianii Diao a; D. W. Fuerstenau, (1995), Coal Flotation with Nonionic Surfactants, Coal Preparation, Vol.16, pp 135-147.
Ngwdi bien tap: Trdn Van Trach
Fine coal is treated by flotation at Hdn Gai washing plant using totally imported flotation reagents. In order to secure flotation reagent supply source for the plant, authors of the study were attempted to manufacture domestic flotation reagents. The paper is to presents study results of the study on floation of Hdn Gai fine coal using domestically made flotation reagents. The results of the study show that local made reagents are prosperous and may be used as an alternative supply option. New made flotation reagents may lead to a minimum dependence on imported reagents as well as may reduce production cost of coal flotation.
nNH HiroNG cun cnc...
C7/ep theo trang 80)
• Giam mgt dp bCin tCr 29 % xudng 24 % se lam giam hdm lugng va thuc thu AI2O3 va SiOj, dong thd'i lam tang thuc thu va hdm lugng Cu va Mo.
• Cin tiln hanh thu nghiem tuyin nli 3 miu edn lai trong nghien cuu ndy vdi hon hgp cdc thuoc de chim neu tren d l kilm chung k i t qua cua no.O
TAI LIEU THAM KHAO 1. Minerals Engineering Vol 24 (2011), trang 754-759.
Ngwdi bien tap: Tran Van Trach
The paper offers the influences of alumosilicate mineral on the floating process for bronze ore porphyry having bronze and molipdenum.
CANG NGHIEP MO so 5 - 2 0 1 3