Zeziphi iintlobo ze izitena alumina eliphezulu zisetyenziswa ngokuxhaphakileyo kwizitofu zemizi-mveliso?

Izitena eziphezulu ze-alumina zibhekiselele kwimveliso ye-sintered equlethe ngaphezu kwe-348% ye-Al2O aluminosilicate okanye i-alumina ecocekileyo. Ngokuqhelekileyo, izitena eziphezulu ze-alumina ziqukethe ngaphantsi kwe-80% ye-Al2O3, kwaye ezo ziqulethe ngaphezu kwe-80% ye-Al2O3 zibizwa ngokuba zizitena ze-corundum. Xa kuthelekiswa nezitena zodongwe, izitena eziphezulu ze-alumina zineenzuzo ezibalaseleyo zokuchasa okuphezulu kunye nobushushu obuphezulu bokuthambisa phantsi komthwalo. Ekusetyenzisweni kwee-kilns zemizi-mveliso, izitena eziqhelekileyo ze-alumina eziphezulu ziwela kwiindidi ezintlanu ezilandelayo.

(1) Isitena esiqhelekileyo se-alumina ephezulu

Ukubunjwa kwamaminerali okuphambili kwesitena yi-mullite, i-corundum kunye nesigaba seglasi. Njengoko umxholo we-Al2O3 kwimveliso yanda, i-mullite kunye ne-corundum nayo yanda, isigaba seglasi siya kuncipha ngokufanelekileyo, kwaye i-refractoriness kunye nokusebenza kokushisa okuphezulu kwemveliso kuya kwanda ngokufanelekileyo. Izitena eziqhelekileyo ze-alumina zinoluhlu lweempawu ezingcono zokumelana nomlilo kuneemveliso zodongwe, kwaye ziyimpahla enemiphumo emihle yesicelo kunye noluhlu olubanzi lokusetyenziswa. Isetyenziswa ngokubanzi kwiikhilni ezahlukeneyo ze-thermal. Xa kuthelekiswa neemveliso zodongwe, ubomi benkonzo yeziko bunokuphuculwa.

(2) Umthwalo ophezulu isitena esithambileyo esiphezulu se-alumina

Xa kuthelekiswa nezitena eziqhelekileyo ze-alumina eziphakamileyo, izitena eziphezulu ezithambileyo ze-alumina zahlukile kwinxalenye ye-matrix kunye nenxalenye ye-binder: inxalenye ye-matrix yongezwa kunye nokugxila kwamatye amathathu, kwaye ukwakheka kweekhemikhali emva kokudubula kusondele kumxholo wethiyori. i-mullite, eye yaziswa ngokufanelekileyo Sebenzisa izinto eziphezulu ze-aluminium, ezifana ne-corundum powder, i-high-aluminium corundum powder, njl.; khetha umgangatho ophezulu we-spherical dongwe njenge-ejenti yokudibanisa, kwaye usebenzise i-agents edibeneyo yodongwe edibeneyo okanye i-mullite bonding agents ngokuxhomekeke kwiindidi. Ngale ndlela ingasentla, iqondo lobushushu lokuthambisa umthwalo kwizitena eziphakamileyo ze-alumina linokunyuswa malunga ne-50 ukuya kuma-70°C.

(3) Isitena esisezantsi se-alumina ephezulu

Ukuphucula ukuxhathisa kwe-creep yezitena eziphakamileyo ze-alumina ngokwamkela into ebizwa ngokuba yimpendulo engalungelelananga. Oko kukuthi, ngokweqondo lokushisa lokusetyenziswa kwe-oven, yongeza iiminerali zamatye amathathu, i-alumina esebenzayo, njl njl kwi-matrix ukwenza ukubunjwa kwe-matrix kufutshane okanye i-mullite ngokupheleleyo, kuba i-mulliteization ye-matrix ngokuqinisekileyo iya kwandisa i-mullite. umxholo wezinto eziphathekayo , Ukunciphisa umxholo wesigaba seglasi, kunye neempawu ezibalaseleyo zoomatshini kunye ne-thermal ye-mullite zilungele ukuphuculwa kokusebenza kobushushu obuphezulu bezinto eziphathekayo. Ukuze wenze i-matrix ibe yi-mullite ngokupheleleyo, ukulawula i-Al2O3 / SiO2 ngundoqo. Izitena ezisezantsi ze-alumina ezisezantsi zisetyenziswa kakhulu kwiziko elitshisayo, kwiziko lokuqhushumba kunye nezinye iitoni ezishushu.

(4) I-Phosphate ibophe izitena eziphezulu ze-alumina

Izitena eziphezulu ze-aluminium eziboshwe nge-aluminium zenziwe nge-compact super-grade okanye i-high-alumina bauxite clinker njengeyona nto iphambili, isisombululo se-phosphate okanye isisombululo se-aluminium phosphate njenge-binder, emva kokubumba i-semi-dry press, unyango lobushushu kwi-400 ~ 600℃ Iimveliso eziqhagamshelweyo ezibotshelelwe kwikhemikhali. Sisitena esingabaswanga. Ukuze ugweme i-shrinkage enkulu yemveliso ngexesha lokusetyenziswa, ngokuqhelekileyo kuyimfuneko ukuzisa izinto ezinokushisa ezinokushisa, ezifana ne-kyanite, i-silica, njl., kwizithako. Xa kuthelekiswa ne-ceramic edityanisiweyo yezitena eziphakamileyo ze-alumina, ukusebenza kwayo kokuchasa ukuhluthwa kungcono, kodwa ubushushu bayo bokuthambisa umthwalo busezantsi, kwaye ukuxhathisa komhlwa kumbi. Ngoko ke, inani elincinci le-corundum edibeneyo, i-mullite, njl. I-Phosphate ebotshelelwe kwizitena eziphakamileyo ze-alumina zisetyenziswa ngokubanzi kwiikhilni zesamente ezijikelezayo, uphahla lweziko lombane kunye nezinye iindawo zokutshiza.

(5) Ulwandiso lweMicro-isitena esiphakamileyo se-alumina

Isitena senziwe ikakhulu nge-alumina bauxite ephezulu njengeyona nto iphambili, eyongezwe ngamatye amathathu agxininise, kwaye yenziwe ngokwenkqubo yokuvelisa izitena eziphezulu ze-alumina. Ukuze ukwandise ngokufanelekileyo izitena eziphezulu ze-alumina ngexesha lokusetyenziswa, isitshixo kukukhetha ukugxilwa kwamatye amathathu kunye nobukhulu bawo, kunye nokulawula ubushushu bokudubula, ukuze inxalenye yezimbiwa ezikhethiweyo zamatye amathathu ziyi-mullite kunye nezinye ezintathu. -amatye amaminerali ahlala. Iiminerali ezishiyekileyo zamatye amathathu ziphinda zixutywe (i-mulliteized yokuqala okanye eyesibini) ngexesha lokusetyenziswa, ikhatshwa kukwandiswa komthamo. Iiminerali ezikhethiweyo zamatye amathathu zikhethwa ngokufanelekileyo izinto ezidibeneyo. Ngenxa yokuba iqondo lokushisa lokubola kweeminerali zamatye ezintathu lahlukile, ukwanda okubangelwa yi-mullite petrochemical nayo yahlukile. Ukusebenzisa eli nqaku, izitena eziphezulu ze-alumina zinefuthe elihambelanayo lokwandisa ngenxa yokushisa okusebenzayo okuhlukeneyo. Ukunyanzeliswa kwezitena ezidibeneyo kuphucula ukudibanisa okupheleleyo komzimba we-lining, ngaloo ndlela kuphuculwe ukuchasana kwezitena ukungena kwi-slag.