Lub ntsiab kev ua tau zoo ntawm magnesia cib

a Refractoriness

Vim hais tias lub melting point ntawm periclase (MgO) crystals siab heev, ncav cuag 2800 ℃, lub refractoriness ntawm magnesia bricks yog siab tshaj plaws ntawm cov refractory cib, feem ntau yog siab tshaj 2000 ℃.

b. High kub qauv lub zog

Qhov kub-kub lub zog ntawm magnesia bricks tsis zoo, thiab qhov pib softening kub nyob rau hauv load yog nruab nrab ntawm 1500 thiab 1550 ° C, uas yog ntau tshaj 500 ° C qis tshaj qhov refractoriness.

c. Slag tsis kam

Magnesium bricks yog alkaline refractory cov ntaub ntawv thiab muaj zog tiv thaiv alkaline slag xws li CaO thiab FeO. Yog li ntawd, lawv feem ntau yog siv los ua cov ntaub ntawv masonry rau alkaline smelting furnaces, tab sis lawv tsis kam rau cov kua qaub slag yog cov neeg pluag heev. Magnesium bricks tsis tuaj yeem sib cuag nrog cov ntaub ntawv acidic refractory, lawv yuav ua rau muaj kev sib raug zoo thiab raug corroded saum 1500 ° C. Yog li ntawd, magnesia bricks tsis tuaj yeem tov nrog silica cib.

d. Thermal stability

Lub thermal stability ntawm magnesia cib yog qhov tsis zoo, thiab nws tsuas tuaj yeem tiv taus dej txias rau 2 mus rau 8 zaug, uas yog nws qhov tsis zoo.

e. Volume stability

Lub thermal expansion coefficient ntawm magnesia cib yog loj, linear expansion coefficient ntawm 20 ~ 1500 ℃ yog 14.3 × 106, yog li txaus expansion pob qij txha yuav tsum tau sab laug thaum lub sij hawm bricklaying txheej txheem.

f. Thermal conductivity

Lub thermal conductivity ntawm magnesia bricks yog ob peb zaug ntawm av nplaum cib. Yog li ntawd, txheej txheej txheej ntawm lub cub tawg ua los ntawm magnesia cib yuav tsum feem ntau muaj cov txheej txheem cua sov txaus kom txo tau cov cua sov. Txawm li cas los xij, thermal conductivity ntawm magnesia bricks txo nrog nce kub.

g. Dej dej

Qhov tsis txaus calcined magnesium oxide reacts nrog dej los tsim cov tshuaj tiv thaiv hauv qab no: MgO + H2O → Mg (OH) 2

Qhov no yog hu ua hydration reaction. Vim cov tshuaj tiv thaiv no, qhov ntim nthuav dav mus rau 77.7%, ua rau muaj kev puas tsuaj loj rau lub pob zeb magnesia, ua rau tawg lossis avalanches. Magnesia cib yuav tsum tau tiv thaiv los ntawm noo noo thaum lub sij hawm cia.