Nkume nke Magnesia alumina spinel brick

Bricks nke Magnesia alumina spinel brik na -eji magnesia brik mbụ na ájá magnesia alumina spinel ájá nwere nha C/S nke 0.4 dị ka akụrụngwa, yana oke urughuru nke 3mm. Ogo irighiri ihe magnesia na-ewere irighiri ihe buru ibu 3 ~ 1mm, <1mm ọkara irighiri ihe na <0.088mm ntụ ntụ dị mma dị ka ihe atọ. Jiri mmiri mkpofu sọlfọ sulfite dị ka onye nnọchi anya, gwakọta ya na igwe mmiri mmiri, wee jiri akwụkwọ mpịakọta brik 300t mee ya. Mgbe akpọnwụchara ahụ akwụkwọ ndụ akwụkwọ ndụ, a na -agba ya ọkụ na 1560 ~ 1590 ° C. Ekwesịrị ijikwa ikuku oxidizing na -adịghị ike n’oge usoro ọgbụgba ọkụ.

Ngwongwo ihe eji arụ ọrụ dị elu yana nkwụsi ike ọkụ nke brik periclase-spinel dị mma karịa nke brik almina nkịtị magnesia. Ike mkpakọ na ọnọdụ ụlọ bụ 70-100MPa, na nkwụsi ike ujo (1000 ℃, mmiri jụrụ oyi) bụ ugboro 14-19. Enwere ike iji brik periclase-spinel na mpaghara oke okpomoku nke igwe ọkụ ọkụ lime na-arụ ọrụ na igwe na-ere ọkụ.

spinel magnesium-aluminom nke obodo m na-anabata usoro mmepụta abụọ: sintering na ngwakọta. Akụrụngwa bụ tumadi magnesite na alumina ntụ ntụ ma ọ bụ bauxite. Dika ihe ngosi dị iche iche nke magnesia na alumina, a na-ekepụta spinel bara ọgaranya nke magnesia na spinel bara ọgaranya na aluminom na mpaghara dị iche iche.

1. Dịka usoro ma ọ bụ usoro mmepụta: sintered magnesium aluminum spinel (sintered spinel) na fused aluminum magnesium spinel (fused spinel).

2. Dịka ngwa nrụpụta siri dị, enwere ike kewaa ya: bauxite dabere magnesia-aluminium spinel na alumina sitere magnesia-aluminum spinel. (Sintering ma ọ bụ electrofusion)

3. Dabere na ọdịnaya na arụmọrụ, e kewara ya na: spinel nke magnesium bara ụba, spinel nwere aluminom na spinel na-arụ ọrụ.

A na-akpọkwa brik periclase-spinel nke Magnesia alumina spinel, nke a na-eme ya site na ịdị ọcha dị elu fused magnesia ma ọ bụ ịdị ọcha dị elu nwere ọkwa abụọ magnesia na ịdị ọcha dị elu tupu agwakọta ihe magnesia-aluminom spinel dị ka isi akụrụngwa, na-eji ihe ndị doro anya. ﹑ Usoro nrụpụta dị elu na usoro nrụpụta ọkụ dị elu. Ọ bụrụ na e jiri ya tụnyere brik magnesia-chromium, brik a mejupụtara magnesia-aluminom ọ bụghị naanị na-ewepụ mmerụ nke chromium hexavalent, kamakwa ọ nwere ezigbo nguzogide corrosion, nguzogide oxidation-mbelata, nguzogide ọkụ na nkwụsi ike olu dị elu. Ọ bụ simenti buru ibu na nke na-adịchaghị mma Ihe na-anaghị anabata chromium na-anaghị agbanwe agbanwe maka mpaghara ntụgharị nke ọkụ na-agbagharị agbagharị. Ejikwala ya na ngwa igwe nwere oke okpomoku dị ka igwe ọkụ lime, klọọkụ iko, na ngwa nnụcha nke ọkụ si na ya pụta, ọ rụpụtakwala ezigbo ihe.

Ndepụta anụ ahụ na kemịkalụ nke brik spinel magnesium-aluminom mepụtara bụ: MgO 82.90%, Al2O3 13.76%, SiO2 1.60%, Fe2O3 0.80%, porosity pụtara 16.68%, nnukwu njupụta 2.97g/cm3, ike mkpakọ ọnọdụ okpomọkụ 54.4MPa, 1400 strength flexural ike 6.0MPa.

Ejirila brik spinel Magnesium-aluminom nke ọma na mpaghara mgbanwe nke ciment rotary kilns, mana ha na-adịkarị mfe nrụpụta na nrụpụta ihe mgbe ejiri ya na mpaghara ọkụ, siri ike ịkwụgide na akpụkpọ anụ, na enweghị ike iguzogide uzuoku alkali. na simenti clinker mmiri mmiri na -enwe ike. Na enweghị ike iguzogide nrụgide nrụrụ nke nrụrụ nke anụ ọkụ na -ebute na -egbochi ngwa n’ime mpaghara ọkụ. Maka nke a, ndị nchọpụta ewepụtala brik spinel nke magnesia-aluminum nke dabara maka mpaghara mgbanyụ ọkụ nke sọlfọ rotary. Mgbe a na-agba ọkụ ma na-eji ya, akụkụ nke Fe2+ n’ime ihe nrụpụta periclase-spinel bụ oxidized ka Fe3+. N’ikpeazụ, akụkụ nke Fe2+ na Fe3+ na spinel ígwè-aluminom na-agbasa n’ime matriks periclase iji mepụta MgOss. N’otu oge ahụ, ụfọdụ Mg2+ na matriks na-agbasakwa n’ime irighiri akwara aluminom, wee na-emeghachi omume na Al2O3 nke fọdụrụ site na ndakpọ nke ígwè-aluminom spinel iji mepụta magnesium-aluminum spinel. Usoro mmeghachi omume a na -esonyere mgbasawanye olu, na -eduga na nhazi microcracks. Na

Brik spinel ígwè-aluminom nwere ezigbo ihe na-ekogide ọkụ na mgbochi ujo dị ọkụ. N’ime ha, ihe kpatara igwe aluminom ígwè ji akwụgide nke ọma na akpụkpọ anụ anụ yiri nke brik spinel mafic-iron. Ọ bụkwa n’ihi ihe CaO na-eme na simenti clinker na Fe2O3 siri ike gbazere na periclase iji mepụta kristal nke nwere ike ịmị periclase. , Calcium ferrite nke na -ejikọ clinker na firebrick ọnụ. Ihe kpatara ezigbo ujo ọkụ na -eguzogide bụ iguzobe microcracks.

N’ime sistemụ MgO-Al2O3, ọnụọgụ ngwọta siri ike nke Al2O3 na periclase na 1600 ° C bụ ihe dịka 0; ihe ngwọta siri ike na 1800 ° C bụ naanị 5%, nke pere mpe karịa Cr2O3. Na sistemụ MgO-Al2O3, naanị ọnụọgụ abụọ bụ magnesium aluminum spinel. Ebe mgbaze nke aluminom spinel spinel dị elu dị ka 2135 ℃, na oke okpomọkụ eutectic nke MgO-MA bụkwa 2050 ℃. Spinel Magnesium-aluminium bụ ihe sitere n’okike, nke a na-ahụkarị na ịcha ọcha aja, yabụ na ọ nwere nguzozi kemịkal dị mma maka ihe ndị sitere n’okike.

Modulu nke elasticity dị obere, brik magnesia alumina (0.12 ～ 0.228) × 105 MPa, ebe brik magnesia bụ (0.6 ～ 5) × 105MPa; MA nwere ike ibufe MF site na periclase, wee nwee ike kpochapụ FeO. Mmeghachi omume dị ka ndị a: FeO+MgO • AI2O3 → MgO+FeAl2O4, FeO+MgO → (Mg • Fe) O, MA na -amịkọrọ Fe2O3 wee gbasaa ntakịrị ma nwee ebe mgbaze dị elu. Spinel nwere ebe na -agbaze nke 2135 Celsius C, na mmalite mgbaze ya na periclase dị elu karịa 1995 Celsius. Ngwakọta nke abụọ ahụ ga -eme ka arụmọrụ nke njikọta brik magnesia dịkwuo mma. Okpomoku dị nro dị elu dị elu, mana nhazi spinel na -esonyere mgbasawanye olu, yana nchịkọta na ike nrụgharị adịghị ike, yabụ achọrọ oke ọkụ ọkụ. Magburu onwe thermal ujo eguzogide. ike dị elu. Nnukwu nguzogide mmiri.