Shaandheeyaha precoat-ka ayaa la isticmaalaa marka sifaynta tooska ah ee dhexdhexaadinta marada aanay suurtogal ahayn sababtoo ah keega lagama saari karo marada ama marka indho la'aanta la muujiyo.
Faakuum isku mid ah ayaa lagu dabaqayaa dusha durbaanka, shaandhada waxaa lagu dahaadhay markii hore lakabka dhulka diatomaceous, perlite, cellulose, kaarboon ama isku darka halkaas. A dhexdhexaad filter-xidhkii xajisto ee adkaha precoat ilaa 4 "qaro weyn (naqshado Gaarka ogolaan 6 a" precoat qaro weyn). Mar kasta oo lakabka hore ee jaakad dhumucdiisuna ay sii dheeraato muddada qalliinka ka hor inta aan dib loo codsan. Sida slurry quudinta la sifeeyo, adkaha waxa lagu hayaa dusha lakabka precoat. Kacaan kasta, mindi stellite hore u socota ayaa ka xiirta adkaha kaydsan iyo 0.01 " -0.06 " lakab qaro leh oo precoat per kacaan durbaan ah. Ka saarida lakabka khafiifka ah ee jaakad kasta oo kacaan kasta waxay dib u cusboonaysiisaa dusha shaandhaynta waxayna wanaajisaa heerarka sifaynta.
Sicirka hore ee mindida ayaa si aan xad lahayn loogu hagaajin karaa heerka ugu sarreeya ee shaandhaynta iyo isticmaalka ugu yar ee jaakad hore ah.
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