Setene sa Magnesia alumina spinel

Litene tsa Magnesia alumina spinel li sebelisa lehlabathe la mantlha la magnesia le sintered magnesia alumina spinel lehlabathe le sekhahla sa C / S sa 0.4 e le lihlahisoa tse tala, tse nang le boholo ba likaroloana tse 3mm. Boholo ba phatsa ea magnesia bo amohela likaroloana tse kholo tsa 3 ~ 1mm, <1mm likaroloana tse mahareng le <0.088mm phofo e ntle joalo ka metsoako e meraro. Sebelisa mokelikeli oa litšila tsa sulfite joalo ka moemeli ea tlamang, kopanya le leloala le metsi, le sebopeho ka mochini oa khatiso oa litene oa 300t. Kamora ‘mele o motala o omisitsoe, o chesoa ka 1560 ~ 1590 ° C. Sebaka se fokolang sa oxidizing se lokela ho laoloa nakong ea ts’ebetso ea ho thunya.

Matla a mocheso o phahameng le botsitso ba mocheso oa litene tsa periclase-spinel li betere ho feta tsa litene tse tloaelehileng tsa magnesia alumina. Matla a hatellang mochesong oa kamore ke 70-100MPa, ‘me botsitso ba mocheso (1000 ℃, ho futhumatsa ha metsi) ke makhetlo a 14-19. Litene tsa periclase-spinel li ka sebelisoa sebakeng se phahameng sa mocheso oa li-kilns tse sebetsang tsa lime rotary le li-kilns tsa rotary tsa samente.

spinel ea aluminium ea naha ea heso e sebelisa mekhoa e ‘meli ea tlhahiso: ho sintering le fusion. Thepa e tala ke haholo-holo magnesite le indasteri alumina phofo kapa bauxite. Ho latela lits’oants’o tse fapaneng tsa magnesia le alumina, spinel e nang le magnesia le spinel e nang le aluminium e arotsoe le ho sebelisoa libakeng tse fapaneng.

1. Ho latela ts’ebetso kapa mokhoa oa tlhahiso: sintered magnesium aluminium spinel (sintered spinel) le fused aluminium magnesium spinel (fused spinel).

2. Ho latela tlhahiso ea lihlahisoa tse tala, e ka aroloa ka: bauxite-based magnesia-aluminium spinel le alumina-based magnesia-aluminium spinel. (Sintering kapa electrofusion)

3. Ho ea ka litaba le tšebetso, e arotsoe ka: spinel e nang le magnesium, spinel e nang le aluminium le spinel e sebetsang.

Setene sa Magnesia alumina spinel se boetse se bitsoa litene tsa periclase-spinel, tse entsoeng ka bohloeki bo phahameng bo kopantsoeng magnesia kapa bohloeki bo habeli bo entsoeng ka magnesia le pure-pre-synthesized magnesia-aluminium spinel e le lisebelisoa tsa mantlha tse tala, li sebelisa lisebelisoa tse nepahetseng Process Ts’ebetso e phahameng ea khatello ea mocheso le mocheso o phahameng. Ha e bapisoa le litene tsa magnesia-chromium, setene sena sa magnesia-aluminium ha se felise feela kotsi ea chromium e hexavalent, empa hape e na le ts’ireletso e ntle ea ts’enyeho, khanyetso ea phokotso ea khase, ho hanyetsa mocheso le botsitso bo phahameng ba mocheso. Ke samente e kholo e mahareng le e mahareng Sesebelisoa se loketseng haholo sa chromium se sa sebetseng bakeng sa sebaka sa phetoho ea sebōpi sa rotary. E sebelisitsoe hape lisebelisoa tsa mocheso o phahameng joalo ka li-kilns tsa kalaka, li-kilns tsa khalase le lisebelisoa tsa ho hloekisa ka ntle ho sebōpi, hape e bile le litholoana tse ntle.

Litekanyetso tsa ‘mele le tsa lik’hemik’hale tsa litene tse hlahisitsoeng ka magnesium-aluminium ke: MgO 82.90%, Al2O3 13.76%, SiO2 1.60%, Fe2O3 0.80%, porosity e bonahalang 16.68%, bongata ba bongata ba 2.97g / cm3, matla a tloaelehileng a mocheso o hatellang 54.4MPa, Matla a 1400 ℃ a fetohang 6.0MPa.

Litene tsa Magnesium-aluminium spinel li sebelisitsoe ka katleho sebakeng sa phetoho ea li-kilns tsa rotary tsa samente, empa li tloaetse ho koptjoa le ho hahuoa ha sebopeho ha li sebelisoa sebakeng sa ho thunya, ho le thata ho leketla letlalong la sebōpi, ‘me li hanela moholi oa alkali hantle le samente e khorofo mokelikeli oa karolo ea metsi. ‘Me matla a fokolang a ho hanela khatello ea maikutlo e bakoang ke ho fetoha ha’ mele oa sebōpi a lekanyetsa ts’ebeliso sebakeng sa ho thunya. Ka lebaka lena, bafuputsi ba hlahisitse litene tsa magnesia-aluminium spinel tse fetotsoeng tse loketseng sebaka sa ho thunya sa li-kilns tsa rotary. Nakong ea ho thunya le ts’ebeliso, karolo ea Fe2 + mohahong oa reflexory oa periclase-spinel e oxidized ho Fe3 +. Kamora moo, karolo ea Fe2 + le Fe3 + ho tšepe-aluminium spinel e pharalla ho matrix a periclase ho theha MgOss. Ka nako e ts’oanang, tse ling tsa Mg2 + ka har’a matrix le tsona li kenella ka har’a likaroloana tsa tšepe-aluminium spinel, ‘me li itšoara le Al2O3 e setseng ho tloha ho senyeheng ha tšepe-aluminium spinel ho theha magnesium-aluminium spinel. Letoto lena la likarabelo le tsamaisana le katoloso ea molumo, e lebisang ho sebopeho sa li-microcracks. Ho

Litene tsa tšepe tsa aluminium tse nang le tšepe li na le thepa e ntle ea ho fanyeha sebōpi le ho hanyetsa mocheso. Har’a tsona, lebaka leo ka lona tšepe ea aluminium ea tšepe e leketlileng hantle letlalong la sebōpi e tšoana le ea setene sa mafic-iron spinel. E boetse e bakoa ke ketso ea CaO ka samente e sesefang le Fe2O3 e qhibilihisitsoeng ka thata ho periclase ho theha likristale tse ka nosetsang periclase. , Ferrite ea calcium e tlamang tlamahano le mollo. Lebaka la khanyetso e ntle ea mocheso ke ho theoa ha li-microcracks.

Tsamaisong ea MgO-Al2O3, tharollo e tiileng ea Al2O3 ho periclase ho 1600 ° C e ka ba 0; tharollo e tiileng ea 1800 ° C ke 5% feela, e nyane haholo ho feta Cr2O3. Tsamaisong ea MgO-Al2O3, setsi se le seng feela sa binary ke magnesium aluminium spinel. Karolo e qhibilihang ea magnesium aluminium spinel e holimo ho 2135 ℃, mme mocheso o tlase ka ho fetesisa oa MgO-MA le ona ke 2050 ℃. Magnesium-aluminium spinel ke diminerale ea tlhaho, eo hangata e fumanoang mobung oa lehloa o soeufatsang, ka hona e na le botsitso bo botle ba lik’hemik’hale linthong tsa tlhaho.

Modulus ea elasticity e nyane, magnesia alumina setene (0.12 ～ 0.228) × 105 MPa, ha setene sa magnesia e le (0.6 ～ 5) × 105MPa; MA e ka fetisetsa MF ho tloha periclase, mme e ka fiela FeO. Karabelo e tjena: FeO + MgO • AI2O3 → MgO + FeAl2O4, FeO + MgO → (Mg • Fe) O, MA e amohela Fe2O3 mme e hola hanyane mme e na le qhibiliho e phahameng. Spinel e na le ntlha e qhibilihang ea 2135 ° C, ‘me mocheso oa eona oa pele o qhibilihang ka periclase o phahame ho feta 1995 ° C. Motsoako oa tsena tse peli o tla ntlafatsa ts’ebetso ea tlamo ea litene tsa magnesia. Mocheso o nolofatsang mojaro o phahame, empa sebopeho sa spinel se tsamaisana le katoloso ea molumo, ‘me matla a kopanyo le matla a ho sebetsa hape a fokola, ka hona ho hlokahala mocheso o phahameng oa ho thunya. Khanyetso e babatsehang ea mocheso. matla a phahameng. Ho hanyetsa khoholeho e matla.