Magnesia alumina spinel zvidhinha

Magnesia alumina spinel zvidhinha zvinoshandisa yekutanga zvidhinha magnesia uye sintered magnesia alumina spinel jecha ine C / S chiyero che0.4 sezvinhu zvakasvibirira, ine yakakosha particle saizi ye3mm. Iyo magnesia particle saizi inotora 3 ~ 1mm hombe tambo, <1mm yepakati zvimedu uye <0.088mm hupfu hwakatsetseka sezvikamu zvitatu-nhanho. Shandisa sulfite pulp marara emvura seanosunga mumiriri, sanganisa neyakagaya chigayo, uye chimiro ne300t kukweshera kwezvidhina. Mushure mekunge muviri wegirini waomeswa, unopiswa pa1560 ~ 1590 ° C. Iyo isina kusimba oxidizing mhepo inofanirwa kudzorwa panguva yekupfura.

Iyo yepamusoro-tembiricha mega zvivakwa uye kupisa kwemhepo kugadzikana kwepericlase-spinel zvidhinha zviri nani pane izvo zvakajairika magnesia alumina zvidhinha. Iko kusimba kwesimba pane tembiricha yemukamuri ndeye 70-100MPa, uye iko kupisa kwekuvhunduka (1000 ℃, kutonhora kwemvura) inguva gumi neshanu kusvika gumi neshanu. Zvidhinha zve periclase-spinel zvinogona kushandiswa munzvimbo yepamusoro tembiricha yemakiriniki anoshanda erime uye simenti Rotary kilns.

yenyika yangu magnesium-aluminium spinel inotora maviri maitiro ekugadzira: sintering uye fusion. Iyo mbishi zvinhu zvinowanzo kuve magnesite uye maindasitiri alumina upfu kana bauxite. Zvinoenderana nezviratidzo zvakasiyana zvemagnesia uye alumina, magnesia-rich spinel uye aluminium-rich spinel inorongwa uye inoshandiswa munzvimbo dzakasiyana.

1. Maererano nenzira yekugadzira kana nzira: sintered magnesium aluminium spinel (sintered spinel) uye yakasanganiswa aluminium magnesium spinel (fused spinel).

2. Zvinoenderana nekugadzirwa kwemidziyo, inogona kuve yakakamurwa kuita: bauxite-based magnesia-aluminium spinel uye alumina-based magnesia-aluminium spinel. (Sintering kana electrofusion)

3. Zvinoenderana nezviri mukati nekuita, yakakamurwa kuita: magnesium-rich spinel, aluminium-rich spinel uye inoshanda spinel.

Magnesia alumina spinel zvidhinha inonziwo periclase-spinel zvidhinha, iyo inogadzirwa neiyo yakachena-yakachena fused magnesia kana yakakwira-kuchena maviri-nhanho calcined magnesia uye yakakwira-kuchena pre-synthesized magnesia-aluminium spinel seyakanyanya mbishi zvigadzirwa, uchishandisa chaiyo chaiyo zvigadzirwa ﹑ Yakakwira-kumanikidza kuumba uye yakanyanya-tembiricha yekupfura yekugadzira maitiro. Inofananidzwa nemagnesia-chromium zvidhinha, iyi magnesia-aluminium inoumbwa nezvidhinha kwete chete inobvisa kukuvadza kwehexavalent chromium, asi zvakare ine yakanaka ngura kuramba, oxidation-kudzora kuramba, kupisa kupisa uye kupisa kwakanyanya kupisa vhoriyamu. Iyo simende hombe uye iri pakati nepakati Iyo inonyanya kukodzera chromium-yemahara Refractory zvinhu zveiyo shanduko yenzvimbo ye rotary kiln. Yakave zvakare yakashandiswa mune yakakwira-tembiricha michina senge lime kilns, girazi kilns, uye kunze-kwe-kwevira-yekuchenesa michina, uye yakawanawo mhedzisiro yakanaka.

Iwo epanyama uye emakemikari indexes eakagadzirwa magnesium-aluminium spinel zvidhinha ndeaya: MgO 82.90%, Al2O3 13.76%, SiO2 1.60%, Fe2O3 0.80%, pachena porosity 16.68%, bulk density 2.97g / cm3, normal tension compressive simba 54.4MPa, 1400 – simba rinoshanduka 6.0MPa.

Magnesium-aluminium spinel zvidhinha zvakabudirira kushandiswa munzvimbo yeshanduko yesimendi rotary kilns, asi ivo vanowanzo tenderera kuumbwe nekuumbika kwechimiro kana ichishandiswa munzvimbo yekupfura, inonetsa kuturika paganda remoto, uye kusagadzikana nemhepo yealkali. uye simenti inonamira mvura chikamu chinogoneka. Uye husina kugona kugona kurwisa kunetseka kwekumanikidza kunokonzerwa nekushomeka kwemuviri wemoto kunogumira iko kunoshandiswa munzvimbo yekupfura. Nechikonzero ichi, vaongorori vakagadzira yakashandurwa magnesia-aluminium spinel zvidhinha inokodzera nzvimbo yekupfura yesimende rotary kilns. Munguva yekupfura uye kushandisa, chikamu cheFe2 + mune iyo periclase-spinel inoratidzira chimiro yakasanganiswa kuFe3 +. Shure kwaizvozvo, chikamu cheFe2 + uye Fe3 + mune yesimbi-aluminium spinel inopararira mukati mepariclase matrix kuti iumbe MgOss. Panguva imwecheteyo, imwe Mg2 + iri mumatrix inopararira zvakare mu-iron-aluminium spinel particles, uye inoita neakasara Al2O3 kubva pakuora kwesimbi-aluminium spinel kugadzira magnesium-aluminium spinel. Iyi nhevedzano yekuita inofambiswa nekuwedzera vhoriyamu, zvichitungamira mukuumbwa kwema microcracks. Ku

Iyo yesimbi-aruminiyamu spinel zvidhinha zvine yakanaka kiln-yakaturikidzana zvivakwa uye kupisa kwemhepo kushamisira. Pakati pavo, chikonzero nei iyo iron aluminium spinel yakarembera zvakanaka paganda remoto yakafanana neyeye mafic-iron spinel zvidhinha. Izvo zvakare zvinokonzerwa nekuita kweCaO mune simendi kinki uye yakasimba-yakanyungudutswa Fe2O3 mu periclase yekuumba makristasi anogona kunyorova iyo periclase. , Calcium ferrite inosunga clinker uye firebrick pamwechete. Icho chikonzero cheye yakanaka yekupisa yekuvhunduka kuramba ndiko kuumbwa kwema microcracks.

Mune iyo MgO-Al2O3 system, yakasimba mhinduro huwandu hweAl2O3 mu periclase pa1600 ° C inenge 0; iyo yakasimba mhinduro huwandu pa1800 ° C ingori 5%, iri diki kwazvo kupfuura Cr2O3. Mune iyo MgO-Al2O3 system, iyo yega bhainari remubatanidzwa ndeye magnesium aluminium spinel. Iyo yakanyunguduka poindi ye magnesium aluminium spinel yakakwira kunge 2135 ℃, uye yakaderera eutectic tembiricha yeMGO-MA iri zvakare 2050 ℃. Magnesium-aluminium spinel ndeye yakasarudzika zvicherwa, iyo inowanzo kuwanikwa mukuchenesa jecha, saka ine yakanaka makemikari kugadzikana kune zvakasikwa zvigadzirwa.

Iyo modulus yekusununguka iri diki, magnesia alumina chidhinha (0.12 ～ 0.228) × 105 MPa, nepo magnesia chidhinha chiri (0.6 ～ 5) × 105MPa; MA anogona kuendesa MF kubva periclase, uye inogona kutsvaira FeO. Mhinduro yacho ndeinotevera: FeO + MgO • AI2O3 → MgO + FeAl2O4, FeO + MgO → (Mg • Fe) O, MA inobata Fe2O3 uye inowedzera zvishoma uye ine nzvimbo yakanyunguduka yakakwira. Spinel ine nzvimbo inonyungudika ye2135 ° C, uye yayo yekutanga yekunyungudika tembiricha ne periclase yakakwira kupfuura 1995 ° C. Iko kusanganiswa kwevaviri kuchavandudza kubatana kwekuita kwemagnesia zvidhinha. Iko kutapudza kwekutakurisa mutoro kwakakwirira, asi spinel kuumbwa kunoperekedzwa nekuwedzera vhoriyamu, uye iko kuunganidzwa uye kugona kwesisitimu kugona kushoma, saka tembiricha yepamusoro yekupfura inodiwa. Kwakanakisa kupisa kwemafuta. simba rakakwirira. Simba rekudzivirira kwevhu.