ʻO nā pōhaku lepo -alumina kiʻekiʻe he ʻano mea hoʻoheheʻe ʻia i hana ʻia e ke kī ʻana i ka pālolo refractory a i ʻole nā mea maka ʻē aʻe i hoʻopaʻa ʻia i nā wela kiʻekiʻe; pili lākou i ka ʻohana huahana aluminosilicate. ʻO nā pōhaku makamae he mau mea metala ʻole -metala ʻole i loaʻa i nā ʻano like ʻole, e like me -alumina kiʻekiʻe, pālolo, magnesia, corundum, mullite, a me nā pōhaku lepo silicon carbide. Ma muli o ko lākou mau waiwai refractory maikaʻi loa, hoʻohana nui ʻia nā brick alumina kiʻekiʻe ma waena o nā ʻano ʻano like ʻole o nā pōhaku makamae. E like me nā maʻamau no nā mea kiʻekiʻe-alumina refractory, ʻo ka maʻiʻo Al₂O₃ ke kumu hoʻohālike. Hoʻokaʻawale ʻia nā pōhaku alumina kiʻekiʻe i ʻekolu papa: Grade I (Al₂O₃ content > 75%), Grade II (Al₂O₃ content between 60% and 75%), and Grade III (Al₂O₃ content between 48% and 60%).
Ma ke ʻano he ʻano mea refractory, ʻo Al₂O₃ ka nui o nā pōhaku lepo alumina kiʻekiʻe. Hoʻohālikelike ʻia me nā pōhaku lepo a me nā pōhaku semi-silica, ʻoi aku ka ʻoi aku o ka refractoriness o nā pōhaku alumina kiʻekiʻe a no laila ua hoʻokaʻawale ʻia ʻo ia ma ke ʻano he -mau mea hoʻoheheʻe kiʻekiʻe. Hāʻawi ko lākou maʻiʻo Al₂O₃ kiʻekiʻe iā lākou -ʻano kūʻokoʻa, e hiki ai ke kūʻē pono i ka ʻāʻī ʻana e nā palaka ʻawaʻawa a me nā mea maʻamau. Eia nō naʻe, pono e ʻike ʻia ʻoiai aia ka SiO₂, ʻoi aku ka liʻiliʻi o ko lākou kūʻē ʻana i ka slag kumu i ko lākou kūʻē ʻana i ka slag acidic. Ma muli o ka maʻiʻo Al₂O₃, hiki ke hoʻokaʻawale hou ʻia nā brick alumina kiʻekiʻe i nā māka e like me 55, 65, 75, a me 80.
Hoʻokaʻawale ʻia nā brick alumina kiʻekiʻe i nā māka like ʻole e pili ana i kā lākou maʻiʻo Al₂O₃ (aluminum oxide). Ma waena o lākou, ʻo nā pōhaku corundum-me ka ʻike alumini he 90% a ʻoi aku paha-e hōʻike ana i ka papa kiʻekiʻe o nā pōhaku kiʻekiʻe-alumina. Loaʻa i nā pōhaku lepo alumina kiʻekiʻe "ka papa kūikawā" he 85% ka liʻiliʻi loa, ʻoiai ʻo nā pōhaku lepo Papa I aia ma luna o 75%; He 65% a me ka 55% alumini ka nui o na brick Grade II a me Grade III. Hāʻawi kēia mau māka ʻokoʻa i nā waiwai refractory like ʻole e hoʻokō i nā koi ʻoihana like ʻole. ʻO nā pōhaku lepo alumina kiʻekiʻe he ʻano o ka aluminosilicate refractory huahana i hōʻike ʻia e ka alumini oxide (Al₂O₃) maʻiʻo ma mua o 48%. Ke pi'i ka ma'i'o Al₂O₃ i ka 90% a oi aku paha, ua helu 'ia lakou ma ke 'ano o ka corundum brick -kahi ʻano like ʻole-alumina bricks e hāʻawi ana i ka hana refractory maikaʻi loa. Pono e hoʻomaopopo ʻia he ʻokoʻa paha nā maʻamau no nā pōhaku alumina kiʻekiʻe -ma waena o nā ʻāina ma muli o nā ʻokoʻa o nā kumuwaiwai i loaʻa.
No ka laʻana, ma nā ʻāina ʻEulopa, ua hoʻonohonoho ʻia ka maʻiʻo Al₂O₃ liʻiliʻi no nā mea kiʻekiʻe -alumina refractory ma 42%. Ma Kina naʻe, hoʻokaʻawale ʻia nā pōhaku alumina kiʻekiʻe i ʻekolu papa: ʻO nā pōhaku lepo Papa I aia ma luna o 75% Al₂O₃; Aia ma waena o 60% a me 75% Al₂O₃ nā pōhaku lepo papa II; a me nā pōhaku lepo Papa III ma waena o 48% a me 60% Al₂O₃.