qui trình công nghệ sản xuất xi măng

8/8/2019 Qui trnh cng ngh sn xut xi mng

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I. Qui trnh cng ngh sn xut xi mng

II. Qu trnh nung clinker

III. Thit b h thng tch kim

1. Nguyn tc tch kim

2. Cng ngh lc kim

3. H thng tch kim v bung trn

4. Hot ng v cc kha cnh mi trng ca h thng tch kim


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I. QUI TRNH

S CNG NGH CHUNG


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1. Khai thc vi v t st p vi v t st

2. ng nht nguyn liu th

3. Nghin nguyn liu th

4. ng nht bt sng

5. Nung clinkerNghin thant than, t nguyn liu thay th, t du

6. Lm ngui clinker

7. Nghin Xi Mng

8. Bm cho nh my ng bao v t i xung tu v Ct Li

9. Xut cho thng


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II. L QUAY C B PHN TCH KIM

CC VNG TUN HON

1. CC BC NUNG CLINKER

u v o :bt sng SY ( TCH NC )

NUNG SB

TCH VI (THU NHIT)

NUNG NNG CHY (1450OC) (TA NHIT)

LM NGUI (1000-1100OC)

U RA : CLINKER PRE HEATER V L

Bt liu c m < 1% (H l kh) c cp vo 2 nhnh cyclone # 2 thp

tin nung.

>Xt trong tng cyclone th liu v kh nng i cng chiu


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Trao i nhit l c

ng chiu

>

ttrn ton bthp th liuv kh nng i ngcchiu

Trao i nhit l ngcchiu

Khi l quayv kt hp vi nghing nn bt liu siv hng ui l

Trao i nhit l ngcchiu

Ccch tbay hi nhcc mui kim, muicloc rt ra khiu l bihthng bypass;cccht bay hisunphuac kt hp vi kim theo

clinker ra khi ltrnh vngtun hantrong,to vng trm

Cccht bay hi sinh ra cng nhiu khinhit tng

Cccht bay hi sun phua sinh ra cng nhiu khithiu O2

TIUTN NIT & V SIN

QU TRNH TCH VI DDF L PHN NG THU NHIT

QU TRNH KHI NUNG L L PHN NG TA NHIT

Lng than DDF chim 65-70% do hu ht phn ng

ta nhitu nhit 850-900oC ca DDF

Khi nng cccht bay hicaou l & DDF nght

thiu O2 gim liu

Cn v sinh u l, DDF, hthng bypass thng xuyn

NUNG SB PREHEATER

NIT NUNG


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THU NHIT & TA NHIT

NHHNG CA CC THNH PHN HA CLINKE N CNG XI MNG


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Pha clinker Cng sm Cng tr

C3S

C2S

C2A

C4AF

Mui sun pht kim

NHHNG CA CC THNH PHN PH CLINKE N CNG XI MNG

Phaclinker Cng sm Cng tr

Na2O

K2O

SO3

CL

F


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P2O5,B2O2,SrO

Mn2O3,TiO2

NHHNG CC THNH PHN CHNH CA CLINKE

N C TNH

XMPhachnh :

C3S : cng sm,thi gian ngcng,dnghin (LSF)

C2S : cng tr, bn

C3A : ng ktban u,stanhitsm (S

)

C4AF : ttrng,musc (AR)

Phaph :

Vi tdo : gim thi gian ngcng,cng sm, cchc

Kim / sunpht : tngcng sm,gim cng tr

xt Mg : sginn.

NHHNG CA LSF,SR,AR N KH NNG NUNG & CHT LUNG XI MNG

LSF (0,9-0,98)

Cao: kh nung,tng cng sm

Thp : d nung,gim cng sm

SR : (1,9-3,2)Cao : Kh nung,tng cng sm,ng cng chm

Thp : d nung, dto trm , gim cng ,ta nhitthp

KHI NGHT LM LSF, SRTNG

LIU KH NUNG,TIUTN NHIT CAO


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AR : (1,5-2,5)

Cao : D nung, gim cng sm, bn sun pht,ng cng nhanh ( cnnhiuthch cao hn)

Thp : Kh nung,tng cng sm,ng cng chm,ta nhitthp,

co rt nh

IV. Thit b h thng tch kim


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1: Nguyn tc tch kimHe thong trao oi nhiet co ong tach kiem

Van e kiem trong XMP: neu ham lng kiem trong betongcao, kiem se phan ng vi cac phu gia, lam giam o ben


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hoa dan t i hahuy au t uc tong. (ham l ngi mcho hep t ongclinkernhohn 0,6% qui theo Na2O ).

8000C kiem ayhi manh, phancon lai nam trongkhoangKC23S12, NC8A8, KC8A3, K2SO4, Na2SO4. nhiet o thaphn,kiemngng tu. K2Ongng tu ti 81 97%, Na2Ongng tu t hn.

Tongham lngkiem ayhi khoang3 19%. Nh ay, ui kh

thai cha lngkiemkha lnNguyen ly hoat ong cua ong tach kiem

Qua t nh bay hi cac zon co nhi t o cao, sau o ngng tu lait ong phoili u nhng zon co nhi t othap hn tao vong tuanhoan ki m t ong lo nung clinker XMP bnh thng

Nguyen tac chung la lay mot phan kh thai ra khoi hethong traooi nhiet, ha nhiet o cho kiem ngng tu trong thiet b ngng tukiem, (hoac loc kiem). Sau o, kh nong co ham lng kiem thaphn c hoilu, tr laithiet b trao oi nhiet.

Kh thai khi qua bo phan nay se ngng tu kiem va lng kiem nay

se c tach rieng, khong the hoilu vao clinker. Nh thiet bnay, ham lng kh SO2 va Cl2 cung giam, kh thai sach hn.

Nguyn t c tch ki m

Nhng cht d bay hi (bi/gas) ti im c s l ng nhi u nht. Sau chuyn chng vo dng mui v tch ra khi h thng.

Mc tch = l ng bi* bay hi- nng t p trung

Kh ki m l hn hp ca bil v kh bay hi c c


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Khi hnh mui(trong trng hp ny KCl v NaCl) c hnh thnh trong ccthnh phn kh (clo, lu hunh, kim) ngng t trn cc h t bi l

ng dng c trng ca h thng tch kim Nng cao ca cc cht d bay hi (Cl, S) trong nguyn liu Nng cao ca cc cht d bay hi (S) tr ong cc nhin liu truyn thng

(than, petcoke, ...)

Tng cng s dng nhin liu thay th c ch a clo (dung mi, nha, ng vtn)Sn xut xi mng kim thp

iu qu tch kim

Tch Cl mang l i hiu qu cao hn so vi tch S hoc alkaliKch thc c trng thit b tch kim


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T l tch 1 /100 g / t Cl u vo Nhit l tng ln bi v kh nng v mt phn qu trnh decarbonized c

trch xut t h thng l Ca. 10 kJ / kg cho mi% tch kim b qua qu trnh precalciner Ca 15-20 kJ / kg /% trong trng hp ch lm nng l nung

V d:

S l vi 40 S% tch kim : + 800 kJ / kg cliC l vi 5%-Cl tch kim: + kJ 50 / kg cli

nh hng ca h s tch kim i vi hn hp kh nng v ho t ng ca l T o van ca thit b tch kim ki m sot qu trnh lm s ch.

0

10

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110

Chlorine Bypass Sulfur Bypass Low Alkali Cement

Bypass

Bypassrate(%

)


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nh hng ca h s tch ki m n khilng v thnh phn

i u g xy ra khi h s tch ki m khng chnh xc Tl tch ki m qu thp van kh bay hi qu nh khng .kh thot ra khil Nhit kh l qu cao khng m bo cho l hot ng ( hoc trong trng

hp s dng thit blm sch thng minh) Nng cht bay hitrong cc bil c l rt cao dn n cc vn x l

(dnh bi) hoc thm ch vn n mn

Bypass Dust (at 830 g Cl / ton clinker)

0.0

0.5

0.70.8

1.01.1

1.31.4

0.0

8.6

7.6

6.8

6.1

5.6

5.2 4.8

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0 3 4 5 6 7 8 9

Bypass size [%]

Bypassdu

st[t/h]

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

%C

lin

dust

Bypass dus t [ t/h] Cl concent ration in dus t [%]


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iu g xy ra khi h s tch kim khng chnh xc H s tch kim qu cao. - Vn vi cloggings trong h thng l? - Vn vi nng cao cht d bay hi trong bi kimv v th vn x

l ? - Tuy nhin nng lng (v vt cht trong trng hp x l bi kim) s b

lng ph v nhiu kh nng thot ra khi l. Lun iu chnh t l tch kim chnh xc.

Cn thit ki m sot tnh hnh cht d bay hicng thp cng tt gim thi u nng lng v vt cht thit h i

Ci t h thng tch kim

Kh thot ra (cng ngn cng tt! T i sao?)Trn bungDp tt qu t khng kh Ty chn: nc phun vo bung trn hoc qua thp iung dn tch kim qua b lc (t i sao? inclination!)

B lc kim (nh nht 200 C hoc l E hay BF)Qu t tch kimBi Giao thng vn ti nh my, hm ch a hoc xe tiCi t ty chn b phn lc kh nh my xi mng2. Cng ngh lc kimThit b lc kim c i n lc khng kh


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Thit b lc kim c i n lc khng kh


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c i m: Kh vo thit b vi nhit 1050 - 1150 C

- Kh kim c trn vi khng kh xung quanh 200-250 C- Cc cht kh c ch a bi kim(kh nng v mui kt tinh) c a vo ti

lc. Lc bi tnh in km hiu qu nn ch yu l b lc ti- Cc bi kim c lo i b, ti s dng sau khi c lc chit hoc s dngtrong xi mng nh thanhf phn phCc kh kim sau lc ra ngoi qua ng dn chnhu i m ca khng kh tch kim

Thit k n gin ( ch c 1 ng dn chnh v 1 qu t gia thit b chit v blc)

Khng c cc thit b b sung nc v phn phi ( xe tng , my bm, viphun, my nn..) cn thit

Gim nguy c ca s n mn ca ng dn kh v lc do cao hn i m sng

ca kh kim(t m) Ch c 1 bc lm mt kh v iu khi n nhit Nhc im ca thit b tch kim

Nhng bt li vi vic lm s ch bng khng kh vi lng ln khng kh cnhit kh cao t 1150 xung 200oC kh khn hn vic lm mt bng nc.

Khi lng kh ln nn cn nhiu khng kh l nh lm mt qu t, ng dn khv cc b lc dn n chi ph cao.


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B l c c in vithp iu ha


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B lc c i n vi thp iu ha

c i m: Nhit kh chit 1050 1150 C Kh c trn vi khng kh xung quanh xung ca 350 C Sau kh c lm l nh xung n 150 -250 bng thit b ca mt thp lm

mt (iu khng kh cho cc b lc) Ngoi ra bc 2 v 3 c th c kt hp bng cch thm trc tip nc vobung trn

Cc cht kh c ch a bi kim( kh nng v mui kt tinh) l kh bi trong tilc hoc kt ta xung inCc bi kim c lo i b, ti s dng sau khi c chit hoc s dng trongxi mng nh l mt thnh phn ph

Cc kh lo i b c a qua ng dn chnh ra ngoi Li ch:


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Hiu sutl c tt, so lng kh u vo vi u ra ( khong 50% kh c l csch)

Lng kh kim t v kh lm mt qut t( gim in nng tiu th) Kh qua b l c t nn chi ph u t thp C th iu kh tt hn do m cao hn so vil c bitnh in (kh nng

bo v ca lp bo v tt hn ca cc ht bi v cc c tnh ion ha tt hn)

Nhc im: nguy cn mn Cao hn trong ng dn kh n b l c v quttch kim do

m kh cao(cao hn im sng) Cn thm trang thit b cn thit (b cha nc, my bm, thp iu, p sut,

my nn, vi phun chtlng) Nguy clm tthp trong trng hp phun nc khng ng (phn tn

khng tt) Hai giai on lm sch cn kim sot nhiu hn Kh kim m b gi li bitrnn dnh dn n kh khn trong x ll c (chit

xutt cc thng l c, t mt silo lu tr, bn trong ng vn chuyn bi, ...)

Thit btch kim ti hn chng

c im ca thit btch kim ti hn chng Kh kim c lm sch sau khitrn vi khng kh trong bung trn Cc ht bith c phn tch trong cyclon v itrc tip n thit b vn

chuyn clinker Phn cn li c thi ra ngoi cng vi kh lm mt. Kh kim c trn vi

kh lm mt i vo cc thit b vn chuyn clinker n silo Chi ph u t thp.


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Ch c 1 thit b kt hp kh lm mt v kh lc kim. Khng lc bi giao thng vn ti Khng lc bi lu tr v bi trong qu trnh nghin xi mng t bo tr thit b do s lng t Cc vn xy ra trong silo clinker: cc kh kim c tch t clinker th. Bi

kim a s xut hin y ca cc silo clinker do vy c lng ln kh kim

tn t i trong xi mng. Nh vy n nh hng ti cht lng xi mng. Km linh ho t hn ( khng sn xut c xi mng khng c kh kim, t c l

clinker lun ln kh kim.X l bi

Ki m sot lng bi nh my xi mngKim sot tt cht lng xi mng

Chi ph u t caoBi trong qu trnh vn chuyn xi mngChi ph u t thpBi kim phn tng v bin i cht lng clinker

Bi cht thnh cc m ( c bit l bi S v alkali) quay l i mi trng. Lm s ch kh vi nc. Bn c lc trong cc thit b lc p. Ging nh nc

ra bi n, cc lo i bnh bi c tn dng l i trong l.

Bypassdust

bypass

bag filter

bypass fan

y

7 R F H P HQ W

P LOO

bypass

bag filter

bypass fan

y

7 R FOLQ NH U

V LOR& OLQ N H UWUD Q V S R UW

Bypassdust

bypass

bag filter

bypass fan

y

7 R F H P HQ W

P LOO

bypass

bag filter

bypass fan

y

7 R FOLQ NH U

V LOR& OLQ N H UWUD Q V S R UW


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nh lng bitrong nh my xi mng tthit b, chi ph u t t hn v bo tr t hn (vn x l c th t hn) nh lng bin ng ca bi kim v vth c th bin ng v chtlng xi

mng

l c kim hot ng ch c thtrong trng hp cc nh my xi mng angchy, kh kim c thm vo l nung xi mng trong trng hp ny l ngca (tlinh hot)

Thit btrung gian lu tr bi c b qua Thm thit b, chi ph u t cao hn (vn x l c th nhiu hn) C th x l vn (bi dnh vo silo sau 1 thi gian hot ng nn cn thit

k silo linh hot)X l kh

ng chnh: a s trng hp bi kim kt hp vi kh l trog cc ng chnh

ng ring bit: Trong trng hp amoniac t ng chnh phn ng viCl hocSO2 t kh kim n l mt cch tt tch hon ton kh kim.( v dMissisauga)

Lm lnh : kh kim c th c lm lnh cc qut u tin nu trong thnh phn c (NH , etc) v phi c t chy. Tuy nhin lm cho nhit tng,hiu sut sn xut gim v cc vn n mn xy ra khu vc lm mt.

Thp lm nng: thm cc kh kim va thp lm nng (SO2, Cl) tuy nhin vyvn tc kh tng ln v hiu qu sn xut gim. ( kh lm ngui= kh dp t t)


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T lm s ch kh SO2, Cl m khng lm gim nng sut nh my. Lng kh b sung phi c s l bng b lc.

3. H thng tch kim v bung trnCi t thit b tch kim

1. Kh khaithc (cng ngn cng tt! Ti sao?)2. Bun g trn3. qut lm mt khng kh4. Tychn: nc phun vo bung trn hoc qua thp iu5. kh kim qua ng dn kh qua b lc (ti sao? inclination!)6. kh kim qua b lc (nh nht200 C hoc l EP hayBF)7. qut bi8. Bi Giao thng vn titrong nh my, hm cha hoc xeti9. Cittychn thit b x l bi xi mng.


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Thit b tch kim v bung trn

Mc ch ca cc thit b chit kim Gii nn kh l t i i m c nng caonht trong chng trnh lm giu cht d bay hi (riser)

Ho t ng nh mt "van" cho cc cht d bay hi trong h thng l nung cc ho t ng ca l ki m sot v lm s ch hp l

Gii nn kh vi lng bi l nh nht(mt nng lng, vt liu b mt)


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Vn chuyn kh kim vo bung trn trnh cc bin i xy ra M t thit bl c chitThit b dn kh cn c t u tin mttrc ca

thp lm nng nh nng bil thp ti khu vc ny (bi t c ly ra v do thit hi vt cht t hn v tn tht nhit t hn)

Cc thit b x ltrong phn ny ca thit bx l nn cng ngn cng tt biv cc vn tc nghn thng

Cc h thng c hn c tc dn 35 m / s, thit k bung trn mi hn chophp tc cng thp hn 10-15 m / s (l bithp)

THIT BCHITCc ng khaithc c lm bng thp bnh thng v ltbng vtliu chu la hoc c th c lm t thp l hi c bit m khngcn vtliu chu la.

MC CHCA BUNG TRNCc kh l nng c a qua ng khaithc phi c lm lnh (ngui) xung khong 200 C cng c cc thnhphn kh (SO2, HCl, )


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PHNG TRN


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Cc kh nng vo bung trn t di y v dng kh cng bc (khng khcung cp bi cc my qut) a vo theo hng tip tuyn thng qua mt sl.

S phn b ca khng kh bn trong bung trn (ng nht nhi t ) c thc h trbi cc knh phn phi khng kh.


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u phun nc b sung vo bung trn sn xut khilng t kh dp tt bqua

1.2.

3.


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4. Cc vn thng gp: tc nghn ng chit hoc bung trnThng xuynng cn /tc nghn ng chit v / hoc bung trn c th c quan stthy.

tc nghn ng chit hoc bung trnC thl do: lm lnh khng kh vo ngchit v do dn n s ngng t ca cc cht d bay hitrong cc ng dnny

Vn tc dng kh quang chit qu thp (v d


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Gii php: Kim tra h thng c lp t v sa cha nu c sai st. Kim tra nh k cch nhit v sa cha nu cn thit Trnh lm lnh cu ni. Kim tra phn phi kh trong thi gian dng li bo tr v sa cha /t

chc li.

iu chnh tc ng chit nu lng kh thi ra qu nh. Ci t phun khng kh khu vc ni xy ra tc nghn. Gim ng knh ca ng chit nu vn tc chit qu nh (xp x. 35 m / s)

bng cch tng dy ca vtliu chu la (gch/ hoc b tng)


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2. Khng hiu qu ngng t i vi cc cht d bay hi: cn lilng kh thicao trong SO2, HCl,

Tng t l chit tch bil nhiu hn gip cc cht d bay hi hp thu tthn.

Ci t hp phun bil nng to ra nhiu bitrong khng kh l (cngnhiu bithtc chit cng cao)

Bm bi vi ng lm lnh khng kh. Nu lng kh thi cao, v d: ha vitrong bung trn.3. Khng lm mt dng khng kh qua ng chit Kim tra tc dng kh lm lnh. Kim tra tc chit v iu chnh n theo yu cu.4. Tn tht nhit ca h thng ng chit. Kim tra cc h thng qutlm lnh khng kh v m bo tc dng kh

thch hp. Kim tra vtliu chu la trong thi gian bo tr v thay th nu cn thit. Kim tra xem dng khng kh lm lnh vn cn chnh xc (thng tn tht

ca ht gi, b phn phn phi, 4. Hot ng v cc kha cnh mitrng ca h thng tch kim

iu khin h thng tch kim Tl chnh xc ca dng khng kh lm lnh rt cn thittrong b phn tch

ki.m Khng th o trc tip tc h thng tch kim (ch xc nh gin tip).

Vic kim sot c p dng: iu chnh quttheo nhit h thng tch kim sau khi qua cc bung trn.

Kim sot h thng tch kim1. Xc nh lu lng vo ca cc cht d bay hi vo h thng l nung (g /t cli)

cng nh nng bi.2. Suy ra t thng tin ny nng sut ca h thng tch kim.


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3. Da vo nng sut h thng tch kim xc nh lng khng kh cn thit lm lnh t n mt nhit nht nh (v d 200 C c th c tnh (trabng).

Kim sot h thng tch kim4. iu chnh s thitlp qutlm lnh khng kh cung cp lng khng kh

cn thit.

5. iu chnh tc qut h thng tch kim theo im t nhit (v d 200 C) sau bung trn: Bng cch ny a ra mtlu lng khng kh lm lnh xc nh, nhit

im s t c nu nng sut h thng tch kim c tti yu cu. (nulng kh t h thng tch kim l qu thp, nhit s nng ln qu cao vngc li)

Trong trng hp nng sut h thng tch kim khng n nh dn n lngO2 u vo l, qu trnh t chy, nng sut sn xut, s b nh hng.H thng tch kim hot ng

Lm sch 1ln/ca lm vic (hay thng xuyn hn nu cn thit) ng chit vbung trn trnh tc nghn h thng.

Lm sch khe milc, nu khng s lm tc nghn h thng tch kim. Trong qu trnh lm sch bung trn (kim sot c h thng tch kim theo

tiu chun). (khng xc nh lng khng kh lm lnh khi dng khng khhot ng khng ng yu cu). Cc qut h thng tch kim c hotng mttc nht nh.Tc nghn ng chi t b phn tch kim & Phng trn

B phn tch bi kim l rt quan trng. Nu nng cht d bay hi qucao hoc nu bi b m t, n tr nn dnh kt.


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nng bi cao hn c th tr nn rt kh (hoc khng th ) x l.H thng x l bi kim

Cl 5 7%

SO3 10 30 %

K2O 15 20 %

B phn tch bi kim dnh Cc bin php sau y c th c thc hin trong trng hp h thng tch

bi kim khng x l c do dnh: ha long bi h thng tch kim bng cch tng nng sut h thng

tch kim:

- Bi l nung s c trch xut nhiu hn. Kh nng s c trch xut nhiu hn. Nng lng v vt liu s b tn tht nhiu hn.

Ci t hp phun u vo l tng bi trong khng kh l

- Tn tht bi cao hn t cc l nung. Lng kh chit xut s c thay i.

Byp u t ( t g ton n )

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Byp3 4 4 4

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Byp

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Bypass dust [t/h] Cl concentration in dust [%]


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Bm bi th vo khng kh lm lnh hoc vo bu ng trn ca h thng tch kim:- Khng mtthm liu nung.

Nguy ctc nghn trong trng hp bi phn tn km trong bung trn.


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S dng b phn tch bi kimBi rc: trch nhim v mitr. Khu vc bn cht kt dnh, va ...

Tito vng bi v s dng n lm nguyn liu th. Gii php u tin:

Kh thit b phn tch kim c lp t Trong trng hp lm ngui kh thithiu hiu qu SO2 d hoc HCl c th

vn tn ti. Mt vn c bitl kh thiSO2 t vic lp t vng tun hon clo

rt cao, SO2 (t bil chit xut niSO2 c th ngng t). C thlm tng lng kh thiti ngn chnh hoc dn n mchm

ng khi kh vng v cc loi kh nng c trn ln trong ngn chnhKhithi

NH3 t b sy (bith, SNCR) l phn ng viHCl hoc SO2 t kh tunhon v cc hnh thc phun (nh git hoc mui) khi ri khi ngn.

Ht nhn ngng t tn x nh sng v lm cho chm c th nhn thy.


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36

lume Opacity


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Ti u ha s hot ng b phn tch Ti u ha hiu qu lm ngui bung trn.

iu chnh chnh xc nng sut h thng v lng khng kh lm lnhtng ng.

S dng b iu khin h thng (xem trn) Thng xuyn kim tra thit b kim sot quy trnh (v d nh cp nhit

in) h thng, xem chng vn cn lm vic ng hay l btc nghn. V sinh khoang cha chit v pha trn nh yu cu (lm sch thngminh).

iu chnh ng knh ng chit nu tc chit qu thp Gi h thng cht ch (ng tt c cc l rng khi khng cn thit) Thng xuyn kim tra s dn khng kh v sa cha cho ph hp. Kim tra s n mn v sa cha khng kh khng btn tht. iu chnh ng knh ng chit nu tc chit qu thp


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Tng nng sut h thng, ci t phun giai o n thp hoc phun bith vo bung trn nu khng lm ngui hiu qu hoc nu bi hqu c c.

Thng xuynki m tra vt liu chu la thit h i v pht hin by l nh lo i b chng

Ch : Gi cho s b lc h thng l nng nht c th (n mn) v iu

khi n thit b ki m sot quy trnh. Khng bi ca h thng t i m nu n c th c s dng

ni khc (xi mng, cht kt dnh, cht n, va, )Hy chc chn rng dc ca ng ng kh i vo b lc l

ln trnh bi gii quyt trong ng dn v khi n (ti thi u

70 cho tr ln v 45 tr xung cho ng dn) Ci t phu lc theo di nhit nu h thng dnh do hp th hi

m. Gi cho h thng cht ch v trnh tn tht khng kh

qui trình công nghệ sản xuất xi măng

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