Usoro mmepụta nke magnetik carbon refractory brik

akụrụngwa

Isi akụrụngwa nke brik MgO-C gụnyere magnesia fused ma ọ bụ sintered magnesia, flake graphite, organic binders na antioxidants.

Magnesia

Magnesia bụ isi akụrụngwa maka imepụta brik MgO-C, nke enwere ike kewaa n’ime magnesia fused na sintered magnesia. E jiri ya tụnyere magnesia sintered, magnesia agwakọtara nwere uru nke mkpụrụ kristal kristal na-enweghị isi na njupụta olu dị ukwuu. Ọ bụ isi akụrụngwa eji na-emepụta brik carbon magnesia. Mmepụta nke refractories magnesia nkịtị chọrọ ike okpomọkụ dị elu na nguzogide corrosion maka akụrụngwa magnesia. Ya mere, a na-akwụ ụgwọ nlebara anya na ịdị ọcha nke magnesia na C / S ratio na ọdịnaya B2O3 na ihe mejupụtara kemịkalụ. Site na mmepe nke ụlọ ọrụ metallurgical, ọnọdụ mgbaze na-aghọwanye ihe na-achọsi ike. Na mgbakwunye na ihe mejupụtara kemịkalụ, magnesia a na-eji brik MgO-C nke a na-eji eme ihe na-arụ ọrụ igwe (onye ntụgharị, ọkụ eletrik, ladle, wdg) chọrọ nnukwu njupụta na nnukwu crystallization.

Isi iyi nke carbon

Ma na brik MgO-C ọdịnala ma ọ bụ brik MgO-C dị obere nke a na-eji n’ọtụtụ buru ibu, flake graphite na-ejikarị dị ka isi iyi carbon ya. Graphite, dị ka isi akụrụngwa maka mmepụta nke brik MgO-C, tumadi na-erite uru site na ya magburu onwe anụ ahụ Njirimara: ① na-abụghị wetting ka slag. ② Igwe ọkụ dị elu. ③ Mgbasawanye okpomọkụ dị ala. Na mgbakwunye, graphite na refractory ihe adịghị eutectic na elu okpomọkụ, na nwere nnukwu refractoriness. Ịdị ọcha nke graphite nwere mmetụta dị ukwuu na arụmọrụ nke brik MgO-C. N’ozuzu, graphite nwere carbon ọdịnaya karịa 95%, ma dị mma nke ukwuu, ihe karịrị 98% kwesịrị iji.

Na mgbakwunye na graphite, a na-ejikarị oji carbon na-emepụta brik carbon magnesia. Carbon ojii bụ ihe carbonaceous ojii gbasasịrị nke ukwuu site na ire ere ọkụ ma ọ bụ combustion nke hydrocarbon hydrocarbons. Carbon ojii nwere ezigbo ahụ (ihe na-erughị 1μm), nnukwu ebe dị n’elu, yana akụkụ nke carbon bụ 90 ~ 99%, ịdị ọcha dị elu, mgbochi ntụ ntụ dị elu, nkwụsi ike dị elu, nrụpụta ọkụ dị ala, ọ na-esiri ike ịkọwapụta carbon. . Mgbakwunye nke carbon ojii nwere ike imeziwanye nkwụsi ike nke brik MgO-C, mee ka carbon fọdụrụnụ dịkwuo elu, ma mee ka njupụta nke brik dị elu.

Ihe nchikota

A na-ejikarị ihe eji emepụta brik MgO-C na-agụnye coal tar, coal tar na petroleum pitch, nakwa dị ka carbon resins pụrụ iche, polyols, pitch-modified phenolic resins, synthetic resins, wdg. Onye na-ejikọta ihe eji eme ihe nwere ụdị ndị a:

1) Asphalt ihe. Pịt tar bụ ụdị ihe eji ekpo ọkụ. Ọ nwere njirimara nke njikọ dị elu na graphite na magnesium oxide, ọnụ ọgụgụ carbon dị elu dị elu mgbe carbonization gasịrị, yana ọnụ ala. Ejiri ya mee ihe n’ọtụtụ buru ibu n’oge gara aga; mana tar pitch nwere carcinogenic aromatic hydrocarbons, karịsịa ọdịnaya nke benzophthalone. Elu; n’ihi mmụba nke mmata gburugburu ebe obibi, ojiji nke tar pitch na-ebelata ugbu a.

2) Resin bekee. A na-eme resin sịntetik site na mmeghachi omume nke phenol na formaldehyde. Ọ nwere ike ịgwakọta nke ọma na ihe ndị na-emegharị emegharị na ụlọ okpomọkụ. Mgbe carbonization gasịrị, ọnụego carbon fọdụrụnụ dị elu. Ọ bụ ugbu a bụ isi ihe nkedo maka mmepụta brik MgO-C; ma ọ na-etolite mgbe carbonization. Nhazi netwọkụ iko adịghị mma maka nguzogide ujo ọkụ na nguzogide oxidation nke ihe mgbagha.

3) Na ndabere nke asphalt na resin, ihe enwetara mgbe emezigharịrị. Ọ bụrụ na onye na-ahụ maka njikọ ahụ nwere ike ịbụ carbonized ka ọ bụrụ ihe arụrụ arụ ma mepụta ihe eji eme eriri carbon n’ọnọdụ, mgbe ahụ, onye na-ahụ maka njikọta a ga-eme ka arụmọrụ dị elu nke ihe nrụpụta.

antioxidants

Iji meziwanye nguzogide oxidation nke brik MgO-C, a na-agbakwunye obere ihe mgbakwunye. Ihe mgbakwunye ndị a na-ahụkarị bụ Si, Al, Mg, Al-Si, Al-Mg, Al-Mg-Ca, Si-Mg-Ca, SiC, B4C, BN na ihe mgbakwunye Al-BC na Al-SiC-C kọrọ na nso nso a [5] -7]. Ụkpụrụ nke ihe mgbakwunye nwere ike kewaa ụzọ abụọ: N’otu aka ahụ, site n’echiche nke thermodynamics, ya bụ, na okpomọkụ na-arụ ọrụ, ihe mgbakwunye ma ọ bụ ihe mgbakwunye na-emeghachi omume na carbon na-emepụta ihe ndị ọzọ, na mmekọrịta ha na oxygen ka ukwuu. karịa nke carbon na oxygen. , Ọ na-ebute ụzọ karịa carbon ka ọ bụrụ oxidized iji chebe carbon; N’aka nke ọzọ, site n’echiche nke kinetics, Njupụta kemịkalụ, igbochi pores, na-egbochi mgbasa nke oxygen na ngwaahịa mmeghachi omume, wdg.