Isitini saseMagnesia

Ama-refractories e-alkaline anokuqukethwe kwe-magnesium oxide angaphezu kuka-90% ne-periclase njengesigaba esiyinhloko se-crystal.

1. Ukuphindwa kwesitini se-magnesia kufinyelele ku-2000 ℃, futhi izinga lokushisa elithambile ngaphansi komthwalo alishintshi kakhulu ngokuya ngephuzu lokuncibilika kwesigaba esibophayo nesigaba soketshezi esikhiqizwa emazingeni aphezulu okushisa. Ngokuvamile, ukushisa kokuqala kokuthambisa komthwalo wesitini se-magnesia kungu-1520 kuya ku-1600 ℃, kuyilapho i-magnesium ephezulu kakhulu inezinga lokushisa elinciphisayo eliqala ukuthambisa kuze kufike ku-1800 ℃.

2. Ukushisa kokuqala kokulayishwa kwezitini ze-magnesia akuhlukile kakhulu ekushiseni kokuwa. Lokhu kungenxa yokuthi ukwakheka kwesigaba esikhulu sezitini ze-magnesia yi-periclase, kepha amakristalu e-periclase ezitinini ze-magnesia awalugcini uhlaka lwenethiwekhi, kepha ahlanganisiwe. Kuqinisiwe. Ezitini ezijwayelekile ze-magnesia, izigaba ze-silicate eziphansi kakhulu ezinjenge-forsterite ne-magnesite pyroxene ngokuvamile zisetshenziswa njengenhlanganisela. Yize izinhlamvu ze-periclase crystal ezakha isitini se-magnesia zinendawo encibilika kakhulu, ziyancibilika cishe ngo-1500 ° C. Isigaba se-silicate sikhona, futhi i-viscosity yesigaba sayo samanzi incane kakhulu ekushiseni okuphezulu. Ngakho-ke, kukhombisa ukuthi izinga lokushisa lomthwalo nokuwohloka kwamazinga okushisa wezitini ezejwayelekile ze-magnesia akuhlukile kakhulu, kepha kunomehluko omkhulu ku-Refractoriness. Izinga lokushisa elinciphisa umthwalo wezitini eziphezulu ze-magnesia lingafinyelela ku-1800 ° C, ikakhulukazi ngoba inhlanganisela yezinhlamvu ze-periclase yi-forsterite noma i-dicalcium silicate, futhi izinga lokushisa elincibilikayo le-eutectic elenziwe yilo kanye neMGO liphezulu. , Amandla we-lattice phakathi kwamakristalu makhulu futhi ukuguqulwa kwepulasitiki ekushiseni okuphezulu kuncane, futhi izinhlayiya ze-crystal zihlangene kahle.

3. Izinga lomugqa lokunwetshwa kwezitini ze-magnesia ku-1000 ～ 1600 generally imvamisa liyi-1.0% ～ 2.0%, futhi icishe ilingane. Emikhiqizweni ekhanyelayo, ukuqhutshwa okushisayo kwezitini ze-magnesia kungokwesibili kunezitini eziqukethe ikhabhoni. Iyanda ngokushisa. Phezulu futhi phansi. Ngaphansi kwesimo sokupholisa amanzi okungu-1100 ° C, inani lokushaqeka okushisayo kwezitini zemagnesia kuphela izikhathi ezi-1 kuye kwezi-2. Izitini zeMagnesium zinokuqina okuqinile kuma-alkaline slags aqukethe i-CaO ne-ferrite, kepha abuthaka kuma-slags ane-asidi aqukethe i-SiO2. Ku

4. Ngakho-ke, akufanele ixhumane ngqo nezitini ze-silica lapho isetshenziswa, futhi kufanele ihlukaniswe ngezitini ezingathathi hlangothi. Ekamelweni lokushisa, ukuqhutshwa kwezitini ze-magnesia kuphansi kakhulu, kepha emazingeni okushisa aphezulu, ukuqhutshwa kwayo akunakushaywa indiva. Ukusebenza kwezitini zemagnesia kuyahluka kakhulu ngenxa yezinto zokusetshenziswa ezahlukahlukene, imishini yokukhiqiza, nezindlela zobuchwepheshe ezisetshenzisiwe. Ku

5. Izitini zaseMagnesia zisetshenziswa kakhulu ezintanjeni zensimbi ezakhiwe ngensimbi, amafutha e-ferroalloy, izithandani ezixubekayo, izithando zensimbi ezingezimbi, izikhuni zelime zezinto zokwakha, kanye namagridi okuvuselela kabusha ezimbonini zezingilazi ngenxa yokusebenza kahle kwezinga eliphezulu lokushisa nokumelana namandla ne-slag ye-alkaline. Ama-heat exchangers, ama-kilns wokushisa okuphezulu okushisa kanye nama-tunnel kilns embonini ye-refractory.

6. Ngokuvamile, ingahlukaniswa ngezigaba ezimbili: izitini sintered magnesia (ezaziwa nangokuthi izitini zemagnesia ezixoshiwe) kanye nezitini zemagnesia eziboshwe ngamakhemikhali (ezaziwa nangokuthi izitini zemagnesia ezingacinyiwe). Izitini zaseMagnesia ezinenhlanzeko ephezulu nokushisa okuphezulu kokudubula kubizwa ngezitini eziboshwe ngqo zemagnesia ngenxa yokuxhumana ngqo kwezinhlamvu ze-periclase; izitini ezenziwe ngemagnesia ehlanganisiwe njengoba izinto zokusetshenziswa zibizwa njengezitini ezihlanganisiwe zemagnesia.

7.Imikhiqizo ene-alkaline ene-periclase njengesigaba esiyinhloko se-crystal. Umkhiqizo unezici zokushisa okuphezulu kwamandla emishini, ukumelana okuhle kwe-slag, ukumelana nokuguguleka okuqinile, nevolumu elizinzile ekushiseni okuphezulu.

8. Izitini zaseMagnesia zine-refractoriness ephezulu, ukumelana okuhle kwe-alkali slag, izinga lokushisa eliphakeme lokuqala lokuthambisa ngaphansi komthwalo, kepha ukumelana nokushaqeka okungalungile okushisayo. Isitini se-magnesia esenziwe ngamatshe senziwe ngezitini zemagnesia njengezinto eziluhlaza. Ngemuva kokuchotshozwa, ukubethelwa, ukuxojwa futhi kwenziwe, kudutshulwa ezingeni lokushisa eliphakeme elingu-1550 kuye ku-1600 ° C. Ukushisa kokudubula kwemikhiqizo ehlanzekile ephezulu kungaphezulu kwe-1750 ° C. Izitini ze-magnesia ezingasetshenzisiwe zenziwa ngokungeza izibophelelo ezifanele zamakhemikhali ku-magnesia, bese kuxutshwa, kubunjwe futhi komiswe.

9. Isetshenziselwa ikakhulukazi ukwakheka kwensimbi okwenziwe ngensimbi, iziko lesithando sikagesi phansi nodonga lwesithando somlilo, ulwelwesi olungapheli lwesiguquli somoya-mpilo, isithando somlilo sokuncibilikisa insimbi, ithonela lokushisa eliphakeme kakhulu, isitini se-magnesia nezinsimbi zikasimende Izindonga zesithando somlilo, izitini ezi-checkered ku-regenerator yomlilo weglasi, njll.

1. Ukuhlukaniswa kwezitini zemagnesia

Ngokuvamile, ingahlukaniswa ngezigaba ezimbili: izitini sintered magnesia (ezaziwa nangokuthi izitini zemagnesia ezixoshiwe) kanye nezitini zemagnesia ezihlanganiswe ngamakhemikhali (ezaziwa nangokuthi izitini zemagnesia ezingafuthwa). Izitini zaseMagnesia ezinenhlanzeko ephezulu nokushisa okuphezulu kokudubula kubizwa ngezitini eziboshwe ngqo zemagnesia ngenxa yokuxhumana okuqondile kwezinhlamvu ze-periclase crystal; izitini ezenziwe ngemagnesia ehlanganisiwe njengoba izinto zokusetshenziswa zibizwa njengezitini ezihlanganisiwe zemagnesia.

2. Ukwahlukaniswa nokusetshenziswa kwezitini zemagnesia

Izitini zaseMagnesia zine-refractoriness ephezulu, ukumelana okuhle ne-alkaline slag, izinga lokushisa eliphakeme lokuqala lokuthambisa ngaphansi komthwalo, kepha ukumelana nokushaqeka okungahambi kahle. Isitini se-magnesia esenziwe ngamatshe senziwe ngezitini zemagnesia njengezinto eziluhlaza. Ngemuva kokuchotshozwa, ukubethelwa, ukuxojwa futhi kwenziwe, kudutshulwa ezingeni lokushisa eliphezulu lika-1550 kuye ku-1600 ° C. Ukushisa kokudubula kwemikhiqizo ehlanzekile ephezulu kungaphezulu kwe-1750 ° C. Izitini ze-magnesia ezingasetshenzisiwe zenziwa ngokungeza izibophelelo ezifanele zamakhemikhali ku-magnesia, bese kuxutshwa, kubunjwe, futhi kumiswe.

Okwesithathu, ukusetshenziswa kwezitini zemagnesia

Isetshenziselwa ikakhulukazi ukwenziwa kwensimbi ye-alkaline evulekile, isithando somlilo kagesi phansi nodonga, ulwelwesi olungapheli lwesiguquli somoya-mpilo, isithando somlilo esincibilikisayo sensimbi, ithonela lokushisa eliphakeme, itini elibunjiwe le-magnesia kanye nosimende ojikelezayo we-oveni, Isithando somlilo phansi nodonga lwesithando somlilo, Bheka izitini zokwenza kabusha ingilazi kuhhonela, njll.

Okwesine, ukulinganiswa kwenkomba