Ukwahlulahlula kunye nokusebenza kwe-aluminium-magnesium spinel?

Iimpawu ezizodwa zemagniziyam-aluminiyamu spinel, enjengokumelana kwe-slag corrosion, ukumelana okuhle kotshisa kunye namandla aphezulu obushushu, yenza ukuba isetyenziswe ngokubanzi kwizinto ezinqabileyo zokwenza intsimbi. Ukulungiswa kwe-spinel esemgangathweni yangaphambi kokudityaniswa kubonelela ngezixhobo ezitsha zokwenza imveliso ye-amorphous kunye nemilo ephezulu yokucoceka. Okulandelayo, umhleli weQianjiaxin Refractories uya kukwazisa:

Ezimbini iindlela eziphambili zokwenza isipelin sintering kunye neelectrofusion. Uninzi lwezinto ze-spinel zenziwe nge-high-purity synthetic alumina kunye ne-grade-magnesia, egalelwe kwisitovu se-shaft kunye ne-electro-inyibilikile kwiziko lombane le-arc. Uncedo lwe-sintered magnesia-aluminium spinel kukuba le nkqubo yinkqubo eqhubekayo yokubumba, elawula isantya sokondla kunye nokusasazwa kobushushu obulinganiselweyo kwiziko, okukhokelela kubungakanani beekristale obufanayo be-30-80μm kunye ne-porosity ephantsi (<3%) Imveliso.

Imveliso ye-magnesium-aluminium spinel yindlela ye-electrofusion yindlela yokusebenza emele ibhetshi. Ibhloko enkulu yokuphosa kufuneka yongeze ixesha lokupholisa. Ukupholisa kwebhloko yokuphosa kukhokelela kulwakhiwo olungalinganiyo. Ngenxa yokupholisa ngokukhawuleza, iikristali zangaphandle ze-spinel zincinci kuneekristal zangaphakathi ze-spinel. Indawo yokunyibilika ephantsi kugxilwe kwiziko. Ke ngoko, kuyafuneka ukuba uhlele kwaye ulungelelanise izixhobo zemagnesia-aluminium spinel ekrwada.

Olunye uncedo lokusebenzisa izinto ezisulungekileyo ezisulungekileyo ukuvelisa i-aluminium-magnesium spinel sisiqulatho esingahlambulukanga kwi-aluminium-magnesium spinel aggregate (MgO A1203> 99%), ngakumbi umxholo ophantsi weSiO2, owenza ukuba ube nokusebenza kakuhle kobushushu obuphezulu. . I-Bauxite-based spinel ayilunganga njenge-synthetic alumina-based spinel, kwaye inokusetyenziswa kuphela kwiindawo ezinemfuno ezisezantsi zokumelana nokubola kunye namandla obushushu aphezulu.

I-Magnesium-rich (MR) i-aluminium spinel:

Ubukho bomkhondo we-periclase kwi-magnesium-rich aluminium spinel ichaphazela iimpawu kunye nokusetyenziswa kwe-spinel. Kuba i-magnesia-rich spinel MR66 ayinayo i-alumina yasimahla, i-spinel ayisayi kuphinda ivelise i-spinel emva kokongezwa kwizitena ze-magnesia kwaye iyakwandisa umthamo. Ukusetyenziswa kwezitena ze-magnesia nge-MR56 kwiikhonkrithi ezijikelezayo zesamente kunokutshintsha kakhulu ukumelana nokukhwankqiswa kweThermal kwaye kunokutshintsha indawo ye-chrome ore. Isixhobo esiguqula ukuxhathisa kukothuka kwe-thermal kukuba i-spinel inokunyuka okuphantsi kwe-thermal kune-periclase.

Inani elilandelelweyo le-MgO kwi-MR66 lichaphazela usetyenziso lwayo kwizixhobo ezinamanzi, ezinjengezinto ezinokubekwa. Ngenxa yokuhanjiswa kwe-periclase, i-brucite (Mg (OH) 2) inokuveliswa, eya kuthi ibangele ukuba umthamo webhloko uyitshintshe kwaye ibangele iintanda. I-Magnesium-rich aluminium spinel inokusetyenziswa kwii-kilnes zesamente, ngakumbi kwi-tuyere kunye neendawo ezinobushushu obuphezulu.

I-Aluminium-rich (AR) i-magnesium spinel:

I-Refractory eveliswe yi-aluminium-magnesium spinel esisityebi isetyenziswa kakhulu kwimveliso yentsimbi. Iimpawu ezimbini eziphambili zonyusa isicelo se-aluminium-magnesium-rich spinel: inokuphucula amandla obushushu aphezulu kunye nokuxhathisa kukothuka kwezinto, kunye nokumelana kweslag yentsimbi. Ukongezwa kobunyulu be-aluminium-magnesium-rich spinel kwi-alumina castable etshintsha kakhulu amandla obushushu aphezulu.

Umxholo we-spinel kwi-aluminium-magnesium spinel refractories ngokubanzi yi-15% -30% (ehambelana ne-4% -10% MgO). Izifundo zamva nje zikholelwa ukuba kwi-Al-Mg spinel refractories ye-ladle, i-low-silicon (<0.1% SiO2) xa kuthelekiswa ne-silicon ephezulu (1.0% SiO2) izitena ze-Al-Mg spinel zinokubunciphisa ubomi beladle nge-60%. Oku kungqina ukuba intsebenzo efanelekileyo inokubekwa kuphela kwizinto ezisulungekileyo zokwenziwa kwezinto.

Thelekisa phakathi kwe-magnesia-aluminium spinel esele yenziwe ngaphambili kunye nokwakheka kwe-in-situ yemagnesia-aluminium spinel:

Ukuvelisa i-spinel in situ kwi-castable kunokunciphisa iindleko zokuvelisa, kodwa le ndlela inokungalunganga. Xa i-alumina kunye ne-magnesia zisabela kwifom spinel, kuya kubakho ukwanda kwevolumu ebonakalayo. Ngokwezibalo zethiyori zesakhiwo esinyinyithekileyo, ukwandiswa kwevolumu kunokufikelela kwi-13%, kodwa ulwandiso lwenyani lwenyani lumalunga ne-5%, olusephezulu, alunakuphepha ukwenzeka kweentanda zesakhiwo. Izongezo ze-Silicon powder (ezinje nge-silicon powder) zihlala zisetyenziselwa ukukhuthaza ukuntywila kwisigaba solwelo kunye nokuvumela ukuguqulwa okuthile kwendawo kuthintele ukwanda kwevolumu. Nangona kunjalo, amandla obushushu aphezulu kwiglasi eseleyo aya kuba nefuthe elikhulu.