Refractory cement tseem hu ua kub kub cement. Nws's tshwj xeeb cov khoom cement rau kub refractory monolithic. Feem ntau suav nrog:① Tsawg-calcium aluminate refractory cement nrog ntshiab bauxite thiab limestone ua cov ntaub ntawv tseem ceeb.② Dolomite high-temperature cement ua los ntawm kev ntxiv apatite thiab hlau ore ua cov khoom siv tseem ceeb.③ Siv cov ntaub ntawv uas tuaj yeem tsim cov tshuaj tiv thaiv thiab ua kom tawv nqaij ntawm qhov kub thiab txias, xws li refractory sulfates, borates, thiab phosphates ua cov cement uas kub-resistant rau cementing cov ntaub ntawv.
Classification ntawm refractory cement:
1.Aluminate refractory cement
Aluminate refractory cement feem ntau yog ib hom refractory cement ua los ntawm kev sib xyaw thiab sib tsoo 4 qhov chaw (los ntawm qhov loj) ntawm qis-calcium aluminate refractory cement clinker thiab 1 feem ntawm high-alumina cement clinker. Piv nrog rau qis-calcium aluminate refractory cement: siab dua thaum ntxov zog, zoo li refractoriness, thiab tib daim ntawv thov.
2. Low Calcium Aluminate Refractory Cement
Tag nrho cov khoom siv raw ua los ntawm cov khoom siv zoo aluminium alum thiab cov limestone zoo yog sib xyaw rau hauv ib qho kev faib ua feem los tsim cov khoom siv raw nrog cov khoom xyaw tsim nyog. Tom qab sintering, lub clinker nrog tsawg-calcium aluminate raws li lub ntsiab tivthaiv yog av rau hauv hmoov zoo. Cov khoom siv hydraulic cementitious nrog hluav taws kub, hu ua qis calcium aluminate refractory cement.
Tsawg txiv qaub aluminate refractory cement yog ib hom aluminate cement uas yog ua los ntawm cov khoom zoo bauxite thiab limestone nyob rau hauv ib qho kev faib ua feem, sintered thiab hauv av. Nws muaj pes tsawg leeg yog feem ntau: alumina account rau 70 feem pua, calcium oxide nyiaj rau 19 feem pua rau 23 feem pua, silicon dioxide<4%, iron oxide <1.5%. The mineral composition is mainly monocalcium dialuminate, accounting for 60% to 70%, and the refractoriness is above 1650degreeC. Piv nrog rau siab alumina cement, qhov sib txawv tseem ceeb yog: siab alumina cov ntsiab lus, cov ntsiab lus calcium oxide tsawg, tsis tshua muaj zog thaum ntxov, siab refractoriness, thiab lwm yam. Nws tuaj yeem tsim nrog refractory aggregates (xws li calcined bauxite, siab alumina cib fragments, thiab lwm yam. .) nrog refractoriness saum 1770degreeC los ua refractory pob zeb los yog refractory mortar, uas yuav siv tau raws li lub puab txheej ntawm cement rotary kiln thiab lwm yam industrial kilns.
Nws cov kev siv suav nrog: (1) Nws tuaj yeem sib xyaw nrog cov khoom siv refractory nrog refractoriness saum 1770degreeC, xws li calcined bauxite, high-alumina cib fragments, thiab lwm yam., los npaj refractory pob zeb los yog refractory mortar, uas yuav siv tau raws li refractory hauv ob sab phlu rau ib co high-temperature kilns thiab ib co high-temperature tej yaam num uas tau eroded los ntawm cov cua. thiab nag los ntev. (2) Nws tuaj yeem tsim nrog lub teeb aggregates los ua cov pob zeb kub-insulating thiab cov pob zeb kub-resistant. (3) Sib tov nrog asbestos los ua cov khoom asbestos cement nrog rwb thaiv tsev thiab kub tsis kam.
3.calcium magnesium aluminate cement
Calcium magnesium aluminate cement yog ib hom aluminate cement uas yog ua los ntawm cov khoom zoo bauxite thiab dolomite nyob rau hauv ib qho kev faib ua feem, sintered thiab hauv av. Cov ntsiab lus ntawm calcium magnesium aluminate cement feem ntau yog: alumina nyiaj rau 66 feem pua rau 74 feem pua, calcium oxide nyiaj rau 13 feem pua mus rau 18 feem pua, thiab magnesium oxide nyiaj rau 10 feem pua rau 13 feem pua. Silica thiab hlau oxide kab. Cov ntxhia muaj pes tsawg leeg yog calcium aluminate thiab calcium dialuminate accounting rau 45 feem pua rau 60 feem pua, thiab spinel accounting rau 35 feem pua rau 50 feem pua. Lub refractoriness yog siab tshaj 1650degreeC.
Piv nrog cov calcium uas tsis tshua muaj aluminate cement, calcium magnesium aluminate cement muaj qhov zoo hauv qab no: muaj zog tiv thaiv slag thiab hlau yaj tshuaj yaig; nyob rau hauv cov ntaub ntawv ntawm tib cov ntsiab lus alumina, vim muaj cov spinel, siab refractoriness; tsawg sib tov dej, qis porosity tom qab hardening ntawm cement, tsawg calcining shrinkage; tsawg zog poob thaum rhuab mus rau 1100degreeC rau lub cev qhuav dej. Calcium magnesium aluminate xis mas thiab fused dawb corundum thiab lwm yam aggregates yog siv los ua pob zeb, uas yuav siv tau raws li hauv ob sab phlu ntawm cement rotary kilns thiab lwm yam kev lag luam kilns.
