Refractory Cement

Nrog rau kev tshawb pom thiab kev nkag siab ntawm cov cua kub tsis kam ntawm calcium aluminate, cov zis ntawm calcium aluminate hauv Europe tau nce sai heev hauv xyoo 1913. Thaum kawg ntawm xyoo 1980s thiab 1990s, cov cuab yeej tshiab casting maj mam tshwm sim rau cov khoom siv refractory monolithic. Lub twj tso kua mis thiab tus kheej- ntws ntws thev naus laus zis ntawm qis- cement castables tau pib ua ntej thiab siv. Tom qab ntawd, cov tshuaj tsuag ntub dej los yog txau tshuab tau tshwm sim. Hauv cov kev hloov thev naus laus zis no, cov cement refractory tau tsim. Refractory cement tseem hu ua calcium aluminate cement lossis siab alumina cement. Aluminate cement yog hydraulic cementitious khoom ua los ntawm bauxite thiab limestone ua raw cov ntaub ntawv, calcined clinker nrog calcium aluminate ua lub ntsiab tivthaiv thiab alumina cov ntsiab lus ntawm ntau tshaj 50%, thiab tom qab ntawd hauv av. Aluminate cement feem ntau yog daj lossis xim av, tab sis kuj grey. Lub ntsiab minerals ntawm aluminate cement yog monocalcium aluminate (CaO·Al2O3, abbreviated li CA) thiab lwm yam aluminates, nrog rau ib tug me me ntawm dicalcium silicate (2CaO·SiO2).

Refractory cementtuaj yeem siv los ua tus neeg sawv cev rau ntau yam refractory aggregates (xws li corundum, calcined siab alumina bauxite thiab lwm yam) los ua refractory mortar los yog qhob, uas yog siv los ua ob sab rau cement rotary kiln thiab lwm yam kev lag luam kilns.

Kev kho ntawm refractory cement

Thaum lub refractory cement txheej yog ci, cov teeb meem hauv qab no yuav tsum tau them rau:

1) Nyob rau hauv chav tsev kub ntawm 350 degrees, nws yog feem ntau yuav ua rau ib nrab bursting, yog li tshwj xeeb yuav tsum tau them rau qeeb ci. Yog tias tseem muaj ntau cov pa tawm tom qab 350 degrees ntawm kev txuag hluav taws xob, qhov cua sov yuav tsum tau qeeb.

2) Nyob rau hauv cov xwm txheej ntawm qhov cua tsis zoo thiab cov pa tawm tsis yooj yim ntawm cov dej vapor, lub sijhawm tuav yuav tsum tau txuas ntxiv kom tsim nyog.

3) Thaum ci nrog cov roj hnyav, nws yog ib qho tsim nyog yuav tsum nruj me ntsis txwv tsis pub cov roj hnyav los ntawm kev txau rau saum npoo ntawm lub qhov cub hauv ob sab phlu kom tiv thaiv kev tawg ntawm ib nrab.

4) Thaum ci nrog hluav taws, kev sib cuag ncaj qha nrog cov nplaim taws feem ntau ua rau cov cua sov hauv zos sai heev, yog li nws yuav tsum tau tiv thaiv.

5) Rau cov cement refractory tshiab, nws tuaj yeem ci tom qab tsawg kawg 3 hnub.

6) Cov cua txias ntawm cov cement hauv ob sab phlu yuav tsum tau qeeb kom tsis txhob yuam kev cua.