Chovala cha Alumina Ceramic Rubber Liner Chosavala: Njira Yabwino Yotetezera Kuvala kwa Mafakitale

Thechoyikapo cha rabara cha alumina ceramic chosatha kuthandi chinthu chophatikizika chomwe chimagwiritsidwa ntchito kwambiri poteteza kuvala kwa mafakitale. Chimawonjezera moyo wa zida m'mikhalidwe yovuta pophatikiza kukana kwa alumina ceramic ndi mphamvu zotetezera za rabara. Chophimba ichi chimagwiritsa ntchito alumina ngati chinthu chachikulu chopangira, ndi kuwonjezera ufa wa ceramic ndi silicon oxide, wothira kutentha kwambiri pafupifupi 1700°C. Kuchuluka kwa alumina nthawi zambiri sikochepera 95%, kuchuluka kwake kumafika 3.5-3.9 g/cm³, ndipo kuuma kwa Rockwell kuli kokwera kufika pa HRA85-90, zomwe zimapangitsa kuti chisawonongeke bwino. Mu ntchito zenizeni, chophimba ichi chimakhala ndi kapangidwe ka multilayer composite: chapamwamba ndi alumina ceramic, chapakati ndi rabara, ndipo pansi ndi mbale yothandizira yachitsulo. Zigawo zitatuzi zimalumikizidwa mwamphamvu kudzera mu njira yolumikizirana, ndikupanga njira yotetezera kuvala yogwirizana.

Kugwira ntchito bwino kwa chogwirira ichi chophatikizana kumaonekera m'mbali zosiyanasiyana: Choyamba, kukana kwake kutopa ndi kwabwino kwambiri, chifukwa kuuma kwa alumina corundum ceramic kumafika pamwamba pa HRA85, ndipo kukana kutopa kumakhala kopitilira nthawi 200 kuposa chitsulo wamba cha kaboni. Kachiwiri, chinthuchi chimakhala ndi kukana kwabwino. Kudzera mu fomula yolimba ya ceramic komanso kapangidwe kake kozungulira, kuphatikiza ndi gawo la rabara, imatha kukana bwino kukhudzidwa ndi zinthu zazikulu. Kachitatu, chogwirirachi chimakhala ndi kukana kwabwino kutentha ndipo chimatha kugwira ntchito bwino mkati mwa kutentha kwa 0°C mpaka 250°C kwa nthawi yayitali. Kuphatikiza apo, gawo la rabara limagwiritsa ntchito njira yapadera yokhala ndi kukana kwa asidi ndi alkali, yomwe imatha kupirira dzimbiri m'malo ofooka a asidi ndi alkali. Ponena za makhalidwe enieni, mphamvu yokakamiza ya liner ndi ≥850 MPa, kulimba kwa kusweka KΙC ≥4.8 MPa·m1/2, mphamvu yolumikizirana pakati pa rabara ndi ceramic (kuchepa kwa shear) ≥3.0 MPa, ndipo nthawi yokalamba ya rabara ndi ≥15, zomwe zimatsimikizira kudalirika kwa nthawi yayitali kwa chinthucho.

Ma rabara a alumina ceramic omwe satha kutopa amagwiritsidwa ntchito kwambiri m'mafakitale, makamaka kuphatikiza makina operekera malasha amphamvu, ma hopper achitsulo, ma chute a migodi, zida zotsukira malasha, makina operekera zomera za simenti, ndi malo ena owonongeka kwambiri. Mu ntchito zenizeni, ma liners nthawi zambiri amagawidwa m'mitundu yosiyanasiyana monga ma bonded, welded, ndi rabara composite, kuphatikiza mitundu yosiyanasiyana monga rectangle yolimba, yokhala ndi mabowo ozungulira, ndi mapaipi a trapezoidal. Amatha kudulidwa ndikupindidwa malinga ndi mawonekedwe a zida, kukwaniritsa zosowa zoyika zida zapadera. Kapangidwe ka modular kamathandizira kukhazikitsa ndi kusintha kosavuta, kuchepetsa kwambiri nthawi ndi ndalama zosamalira zida. Mu projekiti yosinthira ukadaulo wanzeru wa migodi ndi kukonza matani 4.5 miliyoni ya Dundee Mining, chidebe chopukusira chidagwiritsa ntchito ma liners apamwamba a ceramic okhala ndi K95 fine alumina ≥95% ndi kachulukidwe ≥3.8 g/cm³, kusonyeza kudalirika kwake m'mapulojekiti akuluakulu amafakitale.