Men khử kim loai _ Trường Đại Học Bách Khoa Tp HCM

7/31/2019 Men kh kim loai _ Trng i Hc Bch Khoa Tp HCM

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I-C S L THUYT

Men v bn cht l mt lp thu tinh mng (chiu dy 0.1-0.4mm) ph ln b mt xng gm s.

Khng ging thy tinh, men:

- Khng ng nht.

- Lp trn khi nung phn ng vi mi trng ca l nung.- Lp di th phn ng vi xng, trong lp men c nhngcht khng tan hay kt tinh.


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Men kh kim loi:

Men kh kim loi l loi men nhn c bng cch s dng mitrng nung hoc cc oxit trong phi liu men kh 1 oxit kimloi v trng thi kim loi.

Mu ch o ca

loi men kim loi

ph thuc vo

bn cht kim loi.


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C ch hnh thnh

Lp kim loi trn b mt men hnh thnh l nh qu trnh khchuyn oxit kim loi thnh kim loi.

C hai tc nhn kh:

- Mi trng nung: kh H2 , kh CO. CO + CuO -> Cu + CO2

H2 + CuO -> Cu + H2O

- Nguyn liu trong men : cc oxit kim loi c tnh kh. MxOy + CuO - > MzOt + Cu

Trong ti ny s dng phng php kh bng oxit c trong


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Cc oxit chnh s dng trong men

SiO2 :- SiO2 l mt xit to thu tinh nhng kh chy, c nh

hng quyt nh n chy ca men.Tng bn ho ca

men.- C trong: trong t st, cao lanh, trng thch hay ct quc.

Al2O3 :- C tc dng tng nhit chy ca men nhng li ko di

khong chy ca men. Tng nht, tng bn ho ca men.Tng bn mu dng trong men.

-C trong t st, cao lanh v trng thch.


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K2O:

- L mt cht tr chy b tr quan trng trong cc loi mennung cao.- C trong fenspat kali, cornwall, nephelin syenit, frit.

Na2O :

- L mt cht tr chy mnh hn kali, gin n nhit cao dgy rn men, to mu mnh vi ng, cban, st.- C trong : Fenspat, nephelin syenit, frit natri.

CaO :

- CaO tng chiu dy ca lp trung gian chng nt, bongmen. Tuy nhin CaO li hay kt tinh trn b mt men lm menm trn b mt hay c nn khng c dng nhiu qu.

- C trong: CaCO3 tinh khit, vi, phn, lmit,

vlastnit.


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MgO:

- gin n nhit thp v kh nng chng rn men l hai ctnh quan trng ca xt magi. Trong men nung nhit cao, nl mt xt tr chy.

- C trong bt tan, lmit, cacbonat magi.

CuO:- Trong bi men ny CuO l i tng kh to ra Cu kim

loi.- CuO dng ha cht tinh khit.

MnO2 :- L tc nhn kh c chn bn thn MnO2 khng c tc

dng kh, ch khi trn 1080C, MnO2 chuyn thnh MnO. ChnhMnO l tc phn trc tip phn ng.


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II- THC NGHIM_KT QUA- phng php thc hin th nghim:Kho st cng thc men

To mc

Kho st ng cong nung

Kho st kch thc ht

Kim tra

Kim tra

Kim tra

Kt qu


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B- Thc nghim:

1- Thit b :Knh hin vi quang hc Kyowa Tokyo No.230049, k hiu ng

knh M40/0.65.

My nghin bi siu tc.L nung mu xng.

Sng 63m.

2- Pha h to mc:Phi liu : t st 65%

Cao lanh 35 %

H : T trng 1.6


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3-Kho st cng thc men


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4- Kt qu:

Hnh 2.1 Men 01 Hnh 2.2 Men 02


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Hnh 2.3 Men 03 Hnh 2.4 Men 04


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(a)

(b) (c)Hnh 2.3 Men 03

(a) Hnh chp men 03

(b),(c) Hnh chp knh hin vi quang hc men 03


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Hnh 2.3 Men 03

( Hnh chp men 03

(a),(b),(c),(d),(e) Hnh chp knh hin vi quang hc men 03


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Kt lun:

Mu 05 v 06 xut hin Cu kim loi, c bit mu06 xut hin rt r v nhiu hn so vi mu 05, nhng chxut hin tp trung y chn.

Chn cng thc men 06 tip tc kho st

ng cong nung ph hp hn.


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5 - Kho st ng cong nung:

K t qu th l u hai nhi t 11600C v 12000C trong 2 gi .

Hnh 4.1 Men 06 lu 2 gi 11600CHnh 4.2 Men M001 lu 2 gi 20000C


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Kt lun:

m u M001 l u nhi t 12000C cho k t qu nhi u CuO b kh h n m u 06. V y vi c t ng nhi t l u c hi u qu .

Ch xu t hi n m t vi vng c mu vng c tr ng c a ng ( d on y l Cu c kh t CuO). Vng mu vng t p trung vng ra c a men.

=> phn tch XRD xc nh hm l ng Cu t o thnh.


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Kt qu phn tchXRD mu M001:


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Nhn xt:

Qua hnh chp XRD ta thy c cc pick do Cu to ra( pick mu ) vn cn kh t .

Thay vo cc pick ca CuO ( pick mu xanh ) vn cnli trong mu kh l nhiu .

iu cho thy qu trnh kh i vi CuO khng honton . Do qu trnh nung trong mi trng c oxi nn hn

ch qu trnh kh ( t tc nhn CO)


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6-Kho st kch thc ht vi mumen M001:


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Kt qu

Hnh 5.1 Men M001 Hnh 5.2 Men M002


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Nhn xt :

Qua hnh nh trn c th thy s khc bit gia 2 mutrc v sau khi thay i kch thc hat mt cch r rng :Mu sau khi nghin mn hn th khu vc c nh vng

nhiu hn (thnh tng cm r rng ), nh vng ng nh,phn x nh sng tt hn cho thy phn ng kh xy rahon ton hn . iu cng c th gii thch l do ccht c nghin mn hn dn n din tch b mt phn

ng tng ln to iu kin cho phn ng kh xy ra.Nh vy tng kt qu kh cn nghin phi liu mn

hn, tng din tch b mt , gip phn ng kh hiu quhn.


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III: KT LUN V KIN

NGH1- Kt lun:- La chn tc nhn kh ht sc quan trng i vi

men kh kim loi.- S dng tc nhn kh l oxit kim loi gip to menkim loi d dng hn, kim sot qu trnh kh tt hn.

- S dng tc nhn kh l oxit kim loi gip to men

kim loi d dng hn, kim sot qu trnh kh tt hn.- Kch thc ht cng ng vai tr quan trng trong qu

trnh phn trong men.- Kt qu tm c cng thc men ph hp vi nguyn

liu v v ng cong nung ph hp vi thit b hin c.


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2- Hn ch v kin ngh

Tr ngi ln khi thc hin th nghim to men kh kimloi chnh l l nung.

Do lng kim loi trn mu to cha nhiu v bao phton b lp men; Nhm thc hin xut cc nghin cutip theo ch lu nhit nhit 11000C - 12000C vithi gian lu hn 6 gi.

Ch s dng phng php XRD v kinh hin vi quang hccha th kt lun chnh xc thnh phn ha ca cc v trtrn b mt mu. Cn s dng thm cc phng phpkhc.


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TI LIU THAM KHO

[1] TS. Quang Minh (2008).K thut sn xut vtliu gm s.Nh Xut Bn i Hc Quc Gia Tp.H ChMinh .

[2] TS.Nguyn Vn Dng (2005). Gio trnh cng nghsn xut gm s. Khoa Ha K thut trng i hc BchKhoa 2005.

[3] Nguyn Th Dim i (2011).Men Kim loi. Lun vni hc. i hc Bch Khoa HQG Tp.H Ch Minh.

[4] Nguyn Hu Minh Nht (2008).Nghin cu muluster trang tr gm s. Lun vn i hc. i hc Bch

Khoa HQG Tp H Ch Minh

Men khử kim loai _ Trường Đại Học Bách Khoa Tp HCM

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