HOI NGHI KHOA HOC KY THUAT M O TOAN QUOC LAN THUT XX CNM
NGHIEN CUU TUYEN THAN DO TRO CAO
THUOC MO HA TU VA NUI BEO
TREN MAY LANG USiS\ CHUYEN DONG DAN CONG NGHIEP
TS. PHAM HiJrU GIANG, ThS. N H Q T H ! KIM DUNG ThS. NINH TH! MAI, KS. HOANG H O U DUONG
Trudng Dai hgc Mo-Dja chit
1 Bk 0 eudi the k^ 20 dau the k:y' 21, tren t h i gidi xua't I hien loai may lang ludi ehuyin dpng cong de - I tuyen tiian cd dp tro eao (than ngheo). Loai may lang nay da dupc ap dung b cac nude nhu: CHLB OOc, Trung Qude, Nam Phi, Uc. U'u diem cua loai may lang nay cho ehi phf dien, ehi phf nude va vdn dau tu tha'p hdn so vdi cac loai may lang khi ep (dang lap dat tai xodng tuyen than II CCfa Ong va xudng tuyen than Nam Cau Trang), vi vay chi phf cang tha'p hdn so vdi cac thiit bj tuyen treng huyen phu manhetit. Hieu qua tuyen eCia loai thiit bj tuyen may lang ludi chuyen dpng cong dat kha cao tham ehf khi tuyen than cap hat ldn (cap hat 40+400 mm) cho sai sd cd gidi cdn tha'p hdn ea so vdi loai may lang khf ep hien dai hien nay nho may lang Batae.
Hien nay, b cac md than thupc khu vyc Quang Ninh ndi ehung va md than Ha Tu va Nui Beo ndi rieng dang tdn dpng mdt lopng Idn than cd dp tro eao (dp tro tren 45 %), ed mo lopng than tdn dpng den vai tram nghin tan. Lopng than dp tro cao nay nam ngoai tieu chuan cha't lopng than cua Viet Nam nen rat khd tieu thu. Oe xem xet kha nang Cfng dung loai may lang mdi vao thye te san xuat, nhdm nghien eCfu da tiin hanh thf nghiem hai loai than cha't lupng tha'p cua hai md Ha Tu va Nui Beo tren may lang ludi chuyen ddng cong ban edng nghiep.
1. Tmh chat mlu than nghien cyu 1.1. Thanh phin do hat
Mlu than ehat lupng tha'p dupc Cdng ty CP than Nui Bee va Cdng ty CP than Ha Tu lay mlu va eung cap. Ket qua phan tfch ray khd hai mlu than cCia hai mo neu b Bang 1 va Bang 2.
1.2. Thanh phin ty trgng
Theo ket qua phan tich ray va phan tfch dp tro hai m l u thf nghiem cho tha'y than can tuyin dd'i vdi m l u than Nui Beo ty 6+50 mm va m l u than Ha Tu 3+15 mm. K i t qua phan tfch chim ndi cac ca'p hat thude than hai mau neu b Bang 3 va Bang 4.
Nhan xet: JU kit qua phan tfch ray khd va phan ty trpng mau than cCia hai mo, ed mpt sd nhan xet sau:
•:• Ham lupng cap 0+6 mm trong hai m i u chiem tren 57 %.
• Op tro ca'p 0+6 mm thudc m l u than md Nui Beo tha'p (dudi 38 %) thupc loai cam 6a HG theo TCVN, nen khdng can tuyen cd the tieu thu dupe, trong khi dd m l u than md Ha Tu cd dp tro tren 47
% khdng nam trong tieu ehua'n TCVN.
•:• Than cap hat +15 mm thupc m l u than md Ha Tu ed dp tro cao tren 80 % cd the thai bd dope, trong khi dd dd'i vdi mau than md Nui Beo ed dp tro dudi 75 % VI vay cap hat nay v l n can phai tuyen de tan thu than sach.
Bang 1. Ket qua phan tich ray khd miu than md Nui Beo.
Cap hat, mm +35 15+35
6+15 3+6
1+3 0,5+1
-0,5 Cpng
Than dau Y%
3.72 17.74 16.05 14.69 18.33 9.12 20.35 100.00
A % 72.72 57.07 56.47 42.65 37.65 36.04 35.53 45,58
Luy tfch theo dOdng
EY, % 3.72 21.46 37.51 52.20 70.53 79.65 100.00
A % 72.72 59.78 58.37 53.94 49.71 48.14 45.58
Luy tfch theo am Zy, %
100.00 96.28 78.54 62.49 47.80 29.47 20.35
A % 45.57 44.53 41.69 37.90 36.44 35.69 35.53
HQI NGH! KHOA HOC KY THUAT MO TOAN QUOC LAN THIJTXX
Bang 2. Ke't qua phan tich ray khd miu than md Ha Tu.
Cap hat, mm +35 15+35
6+15 3+6 1+3 0,5+1
-0,5 Cdng
Than dau IY,
%
16.40 12.97 13.15 12.90 14.49 9.26 20.83 100.00
A, % 84.80 81.74 66.60 58.93 51.28 45.00 37.81 60.34
Luy tfch theo dUdno I y , %
16.40 29.37 42.52 55.42 69.91 79.17 100.00
A, % 84.80 83.45 78.24 73.74 69.09 66.27 60.34
Luy tfch theo am IY,
%
100.00 83.60 70.63 57.48 44.58 30.09 20.83
A, % 60.34 55.54 50.73 47.10 43.68 40.02 37.81
Bang 3. Thanh phan t^ trgng than cac cap hat thudc md than Nui Beo Cap t^
trpng -1.4 1,4+1,5 1,5+1,6 1,6+1,7 1,7+1,8 1,8+1,9 1,9-2,0
>2,0 Cdng
Ca'p hat 35+50 mm IY,
%
3.38 12.39
0.56 6.76 1.13 4.79 7.89 63.10
100
A, % 6.07 17.62 34.23 36.62 48.69 53 63.17 85.85 67.30
Cap hat 1 I y , % 16.91 5.81 5.39 4.23 5.18 4.55 3.49 54.44 100.00
5+35 mm A, % 6.76 20.64 30.18 40.84 48.55 57.33 63.09 85.09 59.34
Ca'p hat 6+15 mm I y , %
34.12 4.70 4.28 3.73 3.18 2.62 2.62 44.75 100.00
A, % 5.01 18.17 28.13 38.37 48.14 55.16 61.45 83.31 47.07 Bang 4. Thanh phin t^ trgng than cac cap hat thudc md than Ha Tu.
Cap t^
trpng -1.4 1,4+1,5 1,5+1,6 1,6+1,7 1,7+1,8 1,8+1,9 1,9-2,0
>2,0 Cpng
Cap hat 1 I y , %
3.26 2.24 1.57 1.41 0.99 1.66 1.9 86.97
100
5+35 mm A, % 3 8.32 24.44 35.57 42.42 53.69 61.38 87.54 79.78
Ca'p hat 6+15 mm I y , %
16.02 4.14 2.16 2.43 1.57 3.48 1.08 69.12 - 100
A, % 3.42 13.72 23.58 36.64 47.18 58.79 65.79 88.13 66.93
Cap hat 3+6 mm IY,
%
7.63 20.01
6.22 1.64 3.86 1.03 4.38 55.23
100
A, % 2.66 3.67 15.28 29.98 46.60 51.46 64.87 87.94 56.12
• Mau than md Nui Beo, lupng than (cap t^
trpng -0,15) chiim iO 15,77 % d i n 38,82 %. Phan t^ trpng Idn hdn 2 (cd dd tro Idn hdn 83 %) ed thu hoaeh tCf 63,1 din 44,75 %
• Mlu than mo Ha Tu, lupng than (cap t^ trong -0,5) chiem ty 5,5 % d i n 27,64 %. Phan t^ trpng Idn hPn 2 (ed do tro ldn hdn 87 %) ed thu hoach td 86,97 den 55,23 %.
• Odi vdi may lang ludi chuyen ddng cong rat thfch hpp vdi t^ trpng phan tuyen ty 1,7 d i n 2,0 nen khi tuyen tren may lang cho phep ed the lay ra dUdc da thai cd dd tro 80 %.
2. Ket qua thf nghiem tuyen m l u than Nui Beo 2.1. Phuang an tuyen than cip hat 6^35 mm
•:• Khi thay ddi chieu eao ngudng tran. Diiu kien thay ddi la chieu cao ngudng tran. Ket qua thf nghiem neu d Bang 5.
•:• Khi thay ddi chiiu cao cya cap lieu. Diiu kien thay ddi la chieu cao cya cap lieu (nang sua't cdp lieu). Kit qua thf nghiem neu d Bang 6.
Nhan xet: Tii k i t qua thf nghiem Bang 5 va 6 rut ra mpt sd nhan xet sau:
• Khi thay ddi chiiu cao ngudng tran ty 40 mm
HOI NGHI KHOA HOC KY THUAT MO TOAN QUOC LAN THI/XX ' " i III]
d i n 50 mm: thu hoach than sach giam ty 43,65 % xudng edn 36,28 % va dd trd than sach giam ty 31,73 % xudng cdn 23,83 '%; thu hoaeh da tang ty 51,28 % len 57,16 % va dd tro da dao dpng trong khoang 79 % d i n 76 %.
•:• Khi thay ddi chieu cao cCfa cap lieu ty 80 mm din 90 mm: thu hoaeh than sach tang ty 37,33 % len 39,88 % va dp tro than sachi tang ty 22,74 % len 26,94 %. Thu hoaeh da thai giam ty 57,05 % xudng cdn 53,8 %. Op tro da dao ddng ty 79 % din 80 %.
Bang 5. Thi nghiem thay doi chieu cao ngudng tran.
San pham Y,% A, %
Chiiu cao ngodng tran 40 mm Than sach
Da thai Mun Than dau
43.65 51.28 5.07 100.00
31.73 79.56 49.65 57.16 Chiiu cao ngudng tran 45 mm Than sach
Da thai Mun Than dau
37.33 57.05 5.62 100.00
22.74 79.95 56.43 57.27 Chieu cao ngudng tran 50 mm Than sach
Da thai Mun Than dau
36.28 57.16 6.56 100.00
23.83 76.76 54.79 56.12 Bang 6. Ket qua thi nghiem khi thay doi chieu cao cCfa cap lieu.
San pha'm y, % A, %
Chiiu eao eCfa cap lieu 80 mm Than sach
Da thai Mun Than dau
37.33 57.05 5.62 100.00
22.74 79.95 56.43 57.27 Chiiu eao eCfa ca'p lieu 85 mm Than sach
Da thai Mun Than dau
41.18 53.41 5.41
100
27.25 80.53 47.27 56.79 Chiiu eao cCfa ca'p lieu 90 mm Than sach
Da thai Mun Than dau
39.88 53.8 6.32 100
26.94 79.68 50.23 56.79
2.2. Thi nghiem tuyen than cap hat 6+50 mm Dieu kien cd djnh la nang suat cap lieu, ehiiu cao ngodng tran, tan sd dao dpng va gdc nghieng mat lodi. Thdng sd thay ddi la bien dp dao dpng eua mat ludi. K i t qua thi nghiem neu d Bang 7.
Nhan xet: TO sd lieu Bang 7 cd mdt sd nhan xet sau:
•:• Khi tang bien dp dao dpng eCia ludi tO 60 len 70mm, dp tro than sach giam ty 27 (28) % xudng 24
% va dp tro da thai tang ty 77 % len 80 %, thu hoach than sach tang ty 37 % len 42 %. Niu tiip tue tang bien dp dao dpng len 75 mm, dp tro than sach tang len 33,46 % va da thai dp tro giam xudng cdn 78,8 % Khi tuyen than cap hat 6+50 mm, dp tro tren 58 % vln cd the lay ra dope tiian sach thudc loai cam 4b din cam 5 HG va da thai cd dp tro tren 8 %.
Bang 7. Ke't qua tuyen cap hat 6+50 mm.
San pham Y, % A, %
Bien dp dao dpng 60 mm Than sach
Da thai Mun Than dau
37.21 58.08 4.71
100
27.02 77.57 59.37 57.90 Bien dp dao dpng 65 mm Than sach
Da thai Mun Than dau
42.25 52.7 5.05 100
28.67 78.6 55.43 56.33 Bien dp dao dpng 70 mm Than sach
Da thai Mun Than dau
40.42 54.31 5.27
100
23.7 80.51 57.91 56.36 Bien dd dao ddng 75 mm Than sach
Oa thai Mun Than dau
43.07 50.52 6.41 100.00
33.46 78.80 56.51 57.84
•:• Vi may lang thf nghiem ehi thiet k i de tuyen than d i n ed hat 35 mm, nhung khi tuyin den cd hat 50 mm k i t qua tuyen v l n kha tdt. Khi thiet k i may lang edng nghiep ed hat dUa tuyen d i n 50; 100 mm chac chan k i t qua tuyen se tdt hdn.
3. Ket qua thi nghiem tuyen than md Ha Tu 3.1. PhUdng an tuyen than cap hat 6+35 mm Than cap hat 6+35 mm doa tuyen tren may lang cd dp tro eao tren 73 %, vi vay mue dfch cua
CNM
HOI NGHj KHOA HOC KY THUAT MO TOAN QUOC LAN THUT XX nghien cau la tan thu than sach, do dd ed haiphOPng an tuyen la: tuyen lay ra than sach cd do tro eao (thude cam 6b HG) va phUPng an tuyen de lay ra than sach cd dp tro thap (cam 5 HG). K i t qua thf nghiem neu b Bang 8 va Bang 9.
3.2. PhUdng an tuyen than cip hat 3+15 mm Than cap hat 3+15 mm cd dp hat nhd hdn so vdi cap hat 6+ 35 mm, do dd cap hat nay khd tuyen trpng lyc hPn. Khi thf nghiem tuyen than cap hat 3+15 mm eung lay ra hai loai tiian sach, loai cd dp tro eao (cam 6bHG) va loai ed dp tro tha'p (cam 6a HG). K i t qua thf nghiem neu d Bang 10 va Bang 11.
Nhan xet: T y k i t qua thf nghiem tuyen than Ha Tu cap hat 6+35 va 3+15 mm cd nhan xet sau:
•:• Than cap hat 6+35 mm cd dp tro tren 73 %, sau khi tuyen tren may lang lodi chuyen dpng cong cd the lay ra dope than sach thupc cam 5 HG d i n cam 6b HG, dp tro da thai tren 83 %.
Bang 8. Thi nghiem tuyen cap hat 6+35 mm de lay than sach cd do tro cao.
San pham Than sach Da thai
Mun Cpng
Thu hoach % So vdi
than tuyen 19,35 66,83 13,82 100,00
So vdi than dau
5,05 17,46
3,61 26,12
Op tro % 44,84 83,70 64,63 73,62
Bang 9: Thi nglem tuyen cap hat 6- lay than sach cd do tro thap.
35 mm de
San pham Than sach
Oa thai Mun Cdng
Thu hoaeh % So vdi
than tuyen 16,12 66,97 16,91 100,00
So vdi than dau
4,2? ' 17,49
4,42 26,12
Op tro % ; 30,15 : 86,74 • 63,13 73,62 Bang 10. Thi nghiem tuyen cap hat 3+15 mm de lay than sach cd do tro cao.
San pha'm Than sach Oa thai
Mun Cdng
Thu hoaeh % So vdi
than tuyen 36,62 47,75 15,63 100,00
So vdi than dau
9,54 12,44
4,07 26,05
Op tro % ; 42,8 ; 82,55 : 61,85 i 64,76 ; Bang 11. Thi nghiem tuyen cap hat 3+15 mm de lay than sach cd do tro tha'p.
San pham Than sach Da thai
Mun Cpng
Thu hoaeh % So vdi
than tuyen 26,64 55,21 18,15 ,, 100,0Q
So vdi than dau
6,94 14,38
4,73 26,05
Op tro % ! 36,08 1 81,43 1 59,29 65,33. J Than chat lUpng xa'u
Sang 2 ludi ^6 va (()50 (lOO)mm
Cam -6mm
1
Nhat tay
I ;
Than sach Da thai May lang
Cam Udt Da Dap -15mm
Cam -15mm
'
Be CO dac
nr. pp
r
* ^'
f
Cam bun Node tuan hoan H.LSa do cdng nghe tuyen than chat lugng thap Md Nui Beo.
HOI NGHI KHOA HOC KY THUAT M O TOAN QUOC LAN THUT XX mu,
Than chat JLTdng xau i.T!Tr.«^«fife.1^^B!MrKS«S!ft^iffcP'SiL.^S«,T UtiHillSZMW ' " . s T St
Sang lo 11/61 20 mm
£)a thai + 20 mm Phan cap ruot xoan
May ang
Cam Kdt Oa Than sach-20 Be lang ngoai trdi
Cam biJn Nu'dc tuan hoan
H.2. Sa do cdng nghe tuyen than chat lugng tha'p md Ha Tu.
• Than ca'p hat 3+15 mm cd dp tro tren 65 %, sau khi tuyen tren may lang ludi chuyen ddng ed the lay ra dope than sach thudc loai cam 6 HG d i n 6b HG, dp tro da thai tren 81 %.
• Vl than dua tuyen cd dp tro eao nen thu hoaeh than sach ehi dat tO 7 d i n 9 %.
4. Ket luan va kien nghj 4.1. Ket luan
TO kit qua nghien cyu tuyen mau than md Nui Beo va md Ha Tu ed mpt sd kit luan sau:
1. Hai mlu than nghien cyu cd dp tro cao (tren 45 %), thupc loai than chat lupng tha'p khdng nam trong Tieu ehua'n Viet Nam.
2. Than cap hat - 6 mm thupc md Nui Beo va cap -3 mm thude md Ha Tu ed dp tro dodi 45 % (dat Tieu ehua'n Viet Nam), vi vay, can tach hai cap hat nay ra trudc khi tuyen.
3. Than eae cap hat 3+15; 6+35; 6+50 mm dua tuyen tren may lang ludi chuyen ddng ban edng nghiep cd the lay ra than sach dat Tieu ehua'n Viet Nam (to cam 4b HG den cam 6b HG), tuy theo yeu eau lay ra than sach va phu thupc vao dp tro than dua tuyen.
4. Khi tuye'n than cap 3+15; 6+35; 6+50 mm thupc mo Ha Tu va Nui Beo, cd the la'y ra dupe da thai cd dp tro tren 80 %.
5. Ca'p hat than dUa tuyen cang eao ket qua tuyen cang td't. Ddi vdi may lang ludi chuyen dpng cong cd the dua gidi han tren than dua tuyen den
100 mm hoac cao hdn nUa.
4.2. Kie'n nghj
May lang ludi chuyen ddng cong ed nhiiu uu diem khi tuyen than cd dp tro cao. Dya vao kit qua thf nghiem tren may lang ban edng nghiep bao eao kiin nghi sCf dung hai sd dd edng nghe tuyen neu d H.1vaH.2.n
Ngudi bien tap: Trin Van Trach
i4fcii'Jwlft^.-ilirik!.-ia;ii-'f ' i ' =r 35Ji- teK5^„Si i
ipprn 5ppal: si^aratipn j d p e r ^ f f l | g | p # i i : m^
] fecllerndvableileve jigsiw w S ^ d r n Hh taand
1. Ooi mat ludn cong minh, ddi tai ludn lya. Tuc ngCrNga.
2. So viec nao vopt qua gidi han cua sy c hoa deu c6 nen tang bat dn djnh. Seneca.
3. Cud'n sach la ngodi ban tdt: khi ta chJ nd, nd khdng gian; khi ta tin todng no, r khdng ndi dd'i. Ngan ngd Tho NhTKy.
VTH. suu tam