Magnesia alumina zvidhinha

Magnesia alumina zvidhinha zvakagadzirwa zvemhando yepamusoro sintered magnesia uye ingangoita 8% yakachena Al2O3 hupfu hwakatsetseka kana yepamusoro yepamusoro-alumina bauxite (Al2O3> 78%, SiO2 <20%, diki reFe2O3 nezvimwe zvisina kuchena), uchishandisa sulfite pulp marara emvura se bhainda, Alkaline zvigadzirwa zvinopesana zvinogadzirwa ne batching, kusanganisa, billeting, kuomesa, kupfura uye mamwe maitiro.

Iyo magnesium oxide yemukati mune magnesia alumina zvidhinha ingangoita 85%. Iyo alumina zvirimo ndeye 5% kusvika 10%, iyo yekumberi yekuratidzira zvinhu ne periclase seyakakosha kristaro chikamu uye magnesia-aluminium spinel seyechipiri sekirasiti chikamu (seyakanyanya inosunga chikamu). Iyo inooneka porosity inowanzo kuve 15-18%. Iyo coefficient yekupisa kwekuwedzera ndeye 10.6 × 10-6 / ° C. Iyo yekupisa yekuvhunduka kusagadzikana iri nani pane inoenderana magnesia zvidhinha. Nekuti iyo magnesium aluminium spinel ine yakanyanya kusungunuka nzvimbo inogoverwa mumatrix, simba rayo repamusoro tembiricha rakakwira, uye iko kwekutanga tembiricha yekutakura mutoro iri pamusoro pe1580 ° C. Kurwisa kwe slag kuri nani zvakare. Kazhinji, yepamusoro sintered magnesia inoshandiswa seye granular zvinhu, uye hupfu hwakatsetseka hwakagadzirwa nemagnesia uye bauxite kana mwenje-yakapiswa bauxite kinki kana maindasitiri alumina inowedzerwa mune chimwe chikamu, uye inowanikwa nekusanganisa, kuumba uye kupfura.

1. Magnesia alumina zvidhinha zvinogona kuitwa nekuwedzera 5-10% Al2O3 kune sintered magnesia. A12O3 inowedzerwa muhupfu hwakatsetseka muchimiro cheindasitiri alumina kana yakakwira alumina bauxite kinki.

2. Kana Al2O3 ikaunzwa neakakwirira alumina dombo ivhu, inosungirwa kuunza tsvina senge SiO2 panguva imwe chete, nekudaro ichideredza iyo refractoriness uye yakakwira tembiricha simba reichi chigadzirwa. Naizvozvo, huwandu hwealuminium yakawedzerwa haifanirwe kunge hwakanyanya kukura.

3. Maitiro eparamende ekugadzira magnesia alumina zvidhinha zvakada kufanana neezvemagnesia zvidhinha. Izvo zvinongova kuti tembiricha yekupfura inowanzo kuve yakakwira kupfuura iyo yekupisa tembiricha yemagnesia zvidhinha ne30-50 ° C, inosvika 1750-1800 ° C.

Magnesia alumina zvidhinha zvine zvinotevera hunhu:

1. Magnesia alumina zvidhinha zvine yakanaka yekupisa yekuvhunduka kugadzikana uye inogona kumira kumvura kutonhorera kwemakumi maviri neshanu kana kukwira. Iyi ndiyo mukana wayo wakakurumbira. Magnesia alumina zvidhinha zvine yakanaka yekupisa yekuvhunduka kugadzikana. Ose maviri magnesia alumina spinel uye periclase ndezve cubic crystal system. Iko kuwedzera kwekushisa pamwe chete nekristaro ekisisi nzira yakafanana, saka kuwedzera uye kudzvinyirira zviri zviviri kana tembiricha ichichinja. Iyo yakawanda yunifomu uye inogadzira yakaderera kupisa kupisa.

2. Huru hunhu hwemagnesia alumina zvidhinha zvakare hwakasimba zvishoma pane idzo dzemagnesia zvidhinha. Nekuda kwenzvimbo yepamusoro yekunyungudika yemagnesia-aluminium spinel pachayo, mutoro unodzikamisa tembiricha yemagnesia-aluminium chidhinha iri nani pane iyo yemagnesia zvidhinha, inosvika 1620 – 1690 ℃.

3. Makemikari anoumba magnesia-aluminium zvidhinha zvinosiyana nezvakasiyana zvigadzirwa, kazhinji MgO> 81%, Al2O3 8.7%, SiO2 <6.0%, CaO <1.5%, Fe2O3 <1.0%.

4. Kuumbwa kwemamineral magnesia alumina zvidhinha. Mune ayo mashoma emamineral, iyo yekristaro yakakosha ndeye periclase, uye iyo matrix inoumbwa nemagnesium ferrite, forsterite, forsterite uye magnesia spinel.

5. Iyo Refractoriness uye mutoro softening tembiricha yemagnesia alumina chidhinha. Mune iyo magnesia alumina zvidhinha, iyo periclase makristasi uye iyo magnesia alumina spinel inoumba sisitimu sisitimu. Kunyangwe hazvo hushoma hushoma hwekunyunguduka hwakazara munzvimbo dzekushomeka kwenetiweki, sisitimu yenetwork ichiri Ine kugona kurwisa tembiricha yepamusoro uye mutoro, saka kudzora uye kurerutsa tembiricha inopfava yemagnesia alumina zvidhinha zvakakwirira, iyo Refractoror inogona kusvika 2100 ℃, uye mutoro unopfavisa tembiricha iri 1570 ℃.

6. Iko kuwedzera kwekushisa uye kugadzikana kwekupisa kwemagnesia-aluminium chidhinha. Nekuti iyo yakaenzana yekuwedzera coefficient ye magnesia-aluminium spinel idiki, iyo mitsara yekuwedzera coefficient yemagnesia-aluminium chidhinha idiki kwazvo. Mumatanho e20 ~ 1000 ℃, iyo yekuwedzera yekuwedzera mwero wemagnesia alumina zvidhinha ingori 10.6 × 10-6 ℃ -1. Nekuti iyo magnesia alumina spinel inoita basa mukusimudzira kupisa kwemafuta mune zvidhinha, iyo magnesia alumina chidhinha ine zvirinani kupisa kwemhepo, uye huwandu hwemvura inotonhora inopfuura kakapetwa makumi maviri.

7. Kurwisa kwe slag kwemagnesia-aluminium zvidhinha. Nekuti magnesia-aluminium zvidhinha zvine hukobvu hwakadzika uye pasi porosity, periclase yakakomberedzwa nemagnesia-aluminium spinel, uye AI2O3 inowanzoita neutral neutral oxide, saka magnesia-aluminium zvidhinha Kukwanisa kurwisa acid uye alkaline slag kukukurwa kwakasimba.

Iko kugona kwemagnesia alumina zvidhinha kuchengetedza periclase particles kubva ku slag kukukurwa kwakasimba kupfuura kwe forsterite, saka kugona kwemagnesia alumina zvidhinha kurwisa alkaline slag uye iron oxide slag inosimbiswa.

Magnesia-alumina zvidhinha zvine zvataurwa pamusoro apa zvakanakisa zvimiro, saka zvakave zvichishandiswa zvakanyanya seyekuvaka matenga edenga remhando yepamusoro-tembiricha yekupisa simbi senge inogadzira huni dzakavhurika-moto uye huni dzinopisa-dzemhangura. mhedzisiro yekuwedzera hupenyu hwevira. Iyo hombe yakavhurika choto inogona kusvika ingangoita mazana matatu mavira, uye iyo yepakati uye diki yakavhurika choto ine inopfuura 300 mavira.