Iyo nzira yekugadzira ye magnesia carbon refractory zvidhinha

mbishi

Iwo makuru ezvigadzirwa zveMgO-C zvidhinha zvinosanganisira fused magnesia kana sintered magnesia, flake graphite, organic binders uye antioxidants.

Magnesia

Magnesia ndiyo huru mbishi yekugadzirwa kweMgO-C zvidhinha, iyo inogona kukamurwa kuita fused magnesia uye sintered magnesia. Kuenzaniswa ne sintered magnesia, fused magnesia ine zvakanakira coarse periclase crystal tsanga uye yakakura particle volume density. Ndiyo huru mbishi inoshandiswa mukugadzira magnesia kabhoni zvidhinha. Kugadzirwa kweakajairwa magnesia refractories kunoda kusimba kwepamusoro-tembiricha uye kusagadzikana kwekuora kwe magnesia mbishi zvinhu. Nokudaro, kutarisa kunobhadharwa kune kuchena kwe magnesia uye chiyero cheC / S uye B2O3 zvinyorwa mumakemikari. Nekuvandudzwa kweindasitiri yemetallurgical, mamiriro ekunyungudutsa ari kuramba achiwedzera kudiwa. Mukuwedzera kune kuumbwa kwemakemikari, magnesia anoshandiswa muMgO-C zvidhinha anoshandiswa mune metallurgical equipment (converter, electric furnace, ladle, etc.) inoda kukwirira kwepamusoro uye Great crystallization.

Carbon source

Ingave mune zvechinyakare MgO-C zvidhinha kana yakaderera-kabhoni MgO-C zvidhinha zvinoshandiswa muhuwandu hukuru, flake graphite inonyanya kushandiswa seyayo kabhoni sosi. Graphite, seyakanyanya mbishi kugadzirwa kweMgO-C zvidhinha, inonyanya kubatsirwa kubva kune yakanakisa hunhu hwemuviri: ① isina-kunyorova kune slag. ②High thermal conductivity. ③Kuwedzera kupisa kwepasi. Mukuwedzera, graphite uye refractory zvinhu hazviiti eutectic pane yakakwirira tembiricha, uye ane yakakwirira refractoriness. Kuchena kwegraphite kune simba guru pakushanda kweMgO-C zvidhinha. Kazhinji, graphite ine carbon content inopfuura 95%, uye yakanaka kwazvo, inopfuura 98% inofanira kushandiswa.

Mukuwedzera kune graphite, kabhoni dema inowanzoshandiswa mukugadzira magnesia kabhoni zvidhinha. Kabhoni dema ivhu rakaparadzirwa zvakanyanya dema rehupfu kabhoni rinogadzirwa nekuora nekupisa kana kupisa kusina kukwana kwemahydrocarbon hydrocarbons. Iyo kabhoni dema ine zvimedu zvakanaka (zvisingasviki 1μm), hombe chaiyo nzvimbo, uye chikamu chikuru chekabhoni i90 ~ 99%, kuchena kwepamusoro, kusimba kwehupfu hwepamusoro, kugadzikana kwekushisa kwepamusoro, kutsika kwemafuta, zvakaoma kuita graphitize kabhoni. . Kuwedzerwa kwekabhoni dema kunogona kuvandudza kushorwa kweMgO-C zvidhinha, kuwedzera huwandu hwekabhoni yakasara, uye kuwedzera kuwanda kwezvidhinha.

Binding agent

Mabhinda anowanzo shandiswa kugadzirwa kweMgO-C zvidhinha anosanganisira tara yemarasha, tara yemarasha uye petroleum pitch, pamwe neakakosha kabhoni resin, polyols, pitch-modified phenolic resins, synthetic resins, nezvimwewo.

1) Asphalt zvinhu. Tar pitch imhando ye thermoplastic material. Iyo ine hunhu hwehukama hwepamusoro negraphite uye magnesium oxide, yakakwira yakasara kabhoni rate mushure mecarbonization, uye mutengo wakaderera. Yakashandiswa muhuwandu hwakawanda munguva yakapfuura; asi tara ine carcinogenic aromatics hydrocarbons, kunyanya zviri mu benzophthalone. High; nekuda kwekusimbaradzwa kwekuziva kwezvakatipoteredza, kushandiswa kwetara kwave kudzikira.

2) Resin zvinhu. Synthetic resin inogadzirwa nekuita kwe phenol uye formaldehyde. Inogona kusanganiswa zvakanaka nerefractory particles panzvimbo yekupisa. Mushure mecarbonization, iyo yakasara kabhoni mwero wakakwira. Parizvino ndiyo inonyanya kusungirirwa pakugadzirwa kweMgO-C zvidhinha; asi inoumbwa mushure mekuita carbonization. Iyo girazi retiweki chimiro hachina kunaka kune iyo thermal shock resistance uye oxidation kuramba yerefractory zvinhu.

3) Pamusoro peasphalt uye resin, chinhu chinowanikwa mushure mekushandurwa. Kana iyo yekubatanidza inogona kuve nekabhoni kuti iumbe inlaid dhizaini uye igadzire kabhoni fiber zvinhu mu situ, ipapo iyi yekubatanidza mumiriri inovandudza tembiricha yekushanda kweiyo refractory zvinhu.

Antioxidants

Kuti uvandudze kupikisa kwe oxidation yeMgO-C zvidhinha, zvishoma zvekuwedzera zvinowanzowedzerwa. Zvakajairika zvinowedzera Si, Al, Mg, Al-Si, Al-Mg, Al-Mg-Ca, Si-Mg-Ca, SiC, B4C, BN uye ichangobva kutaurwa Al-BC uye Al-SiC-C zvinowedzera [5. -7]. Nheyo yekuita zvekuwedzera inogona kukamurwa kuita zvinhu zviviri: Kune rimwe divi, kubva pakuona kwe thermodynamics, ndiko kuti, pakushanda tembiricha, additives kana additives zvinosangana nekabhoni kuumba zvimwe zvinhu, uye hukama hwavo hweokisijeni hwakakura. kupfuura iyo kabhoni neokisijeni. , Zvinotora kutanga pamusoro pekabhoni kuti ive oxidized kuchengetedza kabhoni; kune rumwe rutivi, kubva pakuona kwekinetics, iyo kemikari Density, block pores, inotadzisa kupararira kweokisijeni uye maitiro ekuita, nezvimwe.