Wadanne iri ne manyan tubalin alumina ana amfani da su a kilns na masana’antu?

Babban tubali na alumina yana nufin samfurin sintered wanda ya ƙunshi fiye da 348% Al2O aluminosilicate ko alumina mai tsabta. Gabaɗaya, manyan tubalin alumina sun ƙunshi ƙasa da 80% Al2O3, kuma waɗanda ke ɗauke da fiye da 80% Al2O3 ana kiran su tubalin corundum. Idan aka kwatanta da tubalin yumbu, manyan tubalin alumina suna da fa’idodi masu ban sha’awa na babban refractoriness da babban zafin jiki mai laushi a ƙarƙashin kaya. A cikin amfani da kiln masana’antu, manyan bulogin alumina na gama gari sun faɗi cikin rukuni biyar masu zuwa.

(1) Babban bulo na alumina na yau da kullun

Babban ma’adinan ma’adinai na bulo shine mullite, corundum da gilashin lokaci. Yayin da abun ciki na Al2O3 a cikin samfurin ya karu, mulite da corundum kuma suna karuwa, lokacin gilashin zai ragu daidai, kuma refractoriness da babban zafin jiki na samfurin zai karu daidai. Bulogin alumina na yau da kullun suna da jerin mafi kyawun kaddarorin juriya na wuta fiye da samfuran yumbu, kuma kayan aiki ne mai tasirin aikace-aikacen mai kyau da fa’idar amfani. Ana amfani da shi sosai a cikin kilns na thermal daban-daban. Idan aka kwatanta da samfuran yumbu, ana iya inganta rayuwar sabis na kiln.

(2) Babban kaya mai laushi high alumina tubali

Compared with ordinary high alumina bricks, high-load soft high-alumina bricks are different in the matrix part and the binder part: the matrix part is added with three-stone concentrate, and the chemical composition after firing is close to the theoretical composition of mullite, which is reasonably introduced Use high-aluminum materials, such as corundum powder, high-aluminum corundum powder, etc.; select high-quality spherical clay as the bonding agent, and use different clay composite bonding agents or mullite bonding agents depending on the variety. Through the above method, the load softening temperature of high alumina bricks can be increased by about 50 to 70°C.

(3) Ƙarƙashin bulo na alumina mai rarrafe

Improve the creep resistance of high alumina bricks by adopting the so-called unbalanced reaction. That is, according to the use temperature of the kiln, add three-stone minerals, activated alumina, etc. to the matrix to make the composition of the matrix close to or completely mullite, because the mulliteization of the matrix will definitely increase the mullite content of the material , Reduce the glass phase content, and the excellent mechanical and thermal properties of mullite are conducive to the improvement of the high temperature performance of the material. In order to make the matrix completely mullite, controlling Al2O3/SiO2 is the key. Low creep high alumina bricks are widely used in hot blast furnaces, blast furnaces and other thermal kilns.

(4) Phosphate bonded high alumina bulo

Fosphate-bonded high alumina tubalin da aka yi da m super-sa ko farko-aji high-alumina bauxite clinker a matsayin babban albarkatun kasa, phosphate bayani ko aluminum phosphate bayani a matsayin mai ɗaure, bayan Semi-bushe gyare-gyaren latsa, zafi magani a 400 ~ 600 ℃ Kerarre da chemically bonded refractory kayayyakin. Bulo ne da ba a kora ba. Don kauce wa babban raguwa na samfurin a lokacin amfani, yana da mahimmanci don gabatar da kayan albarkatun da za a iya fadada zafi, irin su kyanite, silica, da dai sauransu, a cikin sinadaran. Idan aka kwatanta da yumbu bonded kora manyan alumina tubalin, anti-tsitsin aikin ya fi kyau, amma nauyin tausasa zafin jiki ya yi ƙasa, kuma lalata juriya ba shi da kyau. Sabili da haka, ƙananan ƙwayar corundum, mullite, da dai sauransu yana buƙatar ƙarawa don ƙarfafa matrix. Phosphate bonded high alumina tubalin ana amfani da ko’ina a siminti Rotary kilns, lantarki tanderun rufin da sauran kiln sassa.

(5) Babban bulo na alumina mai girma

Ana yin bulo ne da babban alumina bauxite a matsayin babban ɗanyen abu, an ƙara shi da ɗigon dutse guda uku, kuma an yi shi bisa ga tsarin samar da bulo na alumina. Don haɓaka manyan bulogin alumina yadda yakamata yayin amfani, maɓalli shine zaɓi mahaɗan dutse uku da girmansa, da sarrafa zafin harbi, ta yadda ɓangaren ma’adinan dutse uku da aka zaɓa su zama mullite da wasu daga cikin ukun. – ma’adanai na dutse sun kasance. Sauran ma’adanai na dutse guda uku an ƙara haɓaka su (mulliteized na farko ko na biyu) yayin amfani, tare da haɓaka girma. Zaɓaɓɓen ma’adinan dutse uku sun fi dacewa da kayan haɗin gwiwa. Saboda yanayin ruɓewar ma’adinan dutse guda uku ya bambanta, haɓakar da sinadarin petrochemical na mullite shima ya bambanta. Yin amfani da wannan fasalin, manyan tubalin alumina suna da tasirin faɗaɗa daidai saboda yanayin yanayin aiki daban-daban. Matsi na haɗin ginin bulo yana inganta haɓakar gabaɗaya na jikin mai rufi, ta yadda za a inganta juriya na tubalin zuwa shigar slag.