DE hiahiatia ana te nui o te maitai pāmahana-iti mō ngā ahumahi hinu whare, matū me ētahi atu ahumahi pūngao hei hoahoa me te whakaputa i ngā taputapu hanga me te rokiroki pēnei i te hau hinu wai, te haukini wai, te hāora wai me te hauota wai.
E ai ki te Mahere Tau Rima 12 o Haina, ka arotauhia te whanaketanga o te pūngao matū hinu, ā, ka tere ake te whanaketanga o ngā rauemi hinu me te hau i roto i ngā tau e rima e whai ake nei. Mā tēnei ka whakaratohia he mākete whānui me te whai wāhitanga whanaketanga mō te umanga hanga pūngao me te hanga taputapu rokiroki i raro i ngā tikanga ratonga pāmahana iti, ā, ka whakatairanga hoki i te whanaketanga oNgongo tapawhā ātete pāmahana iti Q355Dngā rauemi. I te mea ko ngā paipa pāmahana iti me whai kaha teitei, me pakari hoki i te pāmahana teitei me te pāmahana iti, me nui ake te parakore o te maitai e hiahiatia ana e ngā paipa pāmahana iti, ā, me te ōwehenga mowhiti o te pāmahana, ka teitei ake hoki te parakore o te maitai. Q355Engongo tapawhā pāmahana tino itikua whakawhanakehia, kua hoahoatia hoki. Ka taea te whakamahi tika i te maitai piriti hei paipa maitai kore hononga mō te kawe hanganga. Kei roto i te tukanga hangahanga ēnei āhuatanga e toru:
(1)Te whakarewa i te oumu pewa hiko: ka whakamahia te rino para me te rino poaka hei whakarewangā rauemi mata, i roto i ēnei ko te rino para he 60-40% te rahi, ā, ko te rino poaka he 30-40%. Mā te whakamahi i ngā painga o te kawakore teitei, te pāmahana iti me te waikura rino teitei o te oumu pewa hiko tino teitei, mā te whakaoho kaha o te tango waro hāora mā te pū hāora paihere i runga i te pakitara oumu, me te whakarewa i te wai hanga maitai tuatahi me te aukati teitei me te oumu pewa hiko tino teitei, ka taea te tango pai i ngā huānga kino o te phosphorus, te hauwai, te hauota me ngā whakaurunga kore-whakarewa i roto i te maitai rewa. Ko te waro pito mutunga o te maitai rewa i roto i te oumu pewa hiko < 0.02%, te phosphorus < 0.002%; Ka mahia te tango waikura hohonu o te maitai rewa i roto i te tukanga pato oumu hiko, ā, ka tāpirihia te pōro A1 me te carbasil hei mahi i te tango waikura i mua.
Ko te ihirangi konumohe i roto i te maitai rewa ka whakahaeretia i te 0.09 ~ 1.4%, kia nui ai te wā mānu o ngā whakaurunga Al203 i hangaia i roto i te maitai rewa tuatahi, ko te ihirangi konumohe o te maitai pire ngongo i muri i te whakamahine LF, te maimoatanga korehau VD me te maka tonu ka eke ki te 0.020 ~ 0.040%, e karo ana i te tāpiri o te Al203 i hangaia e te waikura konumohe i roto i te tukanga whakamahine LF. Ko te pereti nikara e 25 ~ 30% o te koranu katoa ka tāpirihia ki te koko mō te whakakotahi; Mena he nui ake te ihirangi waro i te 0.02%, kāore e taea e te ihirangi waro o te maitai pāmahana tino iti te whakatutuki i te hiahia o te 0.05 ~ 0.08%. Heoi, hei whakaiti i te waikura o te maitai rewa, me whakahaere te kaha pupuhi hāora o te pū hāora tautau pakitara oumu hei whakahaere i te ihirangi waro o te maitai rewa i raro i te 0.02%; Ina rite te nui o te whākōkī ki te 0.002%, ka eke te nui o te whākōkī o te hua ki runga ake i te 0.006%, ka piki ake te nui o te whākōkī kino, ā, ka pā ki te pakari pāmahana iti o te maitai nā te tangohanga o te para kei roto te whākōkī mai i te tāmi oumu hiko me te tāpiri o te ferroalloy i te wā e whakamahine ana i te LF. Ko te pāmahana tāmi o te oumu pewa hiko he 1650 ~ 1670 ℃, ā, ka whakamahia te tāmi raro eccentric (EBT) hei ārai i te para waikura kei uru ki te oumu whakamahine LF.
(2)I muri i te whakamahine LF, ka whāngaihia e te whāngai waea te waea CA parakore 0.20 ~ 0.25kg/t o te maitai hei whakakore i ngā poke, hei hanga i ngā whakaurunga i roto i te maitai rewa kia porowhita. I muri i te maimoatanga Ca, ka pupuhihia te maitai rewa ki te argon i raro i te koko mō te neke atu i te 18 meneti. Mā te kaha o te pupuhi argon ka kore e kitea te maitai rewa, kia roa ai te wā e mānu ai ngā whakaurunga porowhita i roto i te maitai rewa, kia pai ake ai te parakore o te maitai, me te whakaiti i te pānga o ngā whakaurunga porowhita ki te pakari pānga pāmahana iti. Ko te nui o te whāngai o te waea CA parakore he iti iho i te 0.20kg/t maitai, kāore e taea te whakakore katoa i ngā whakaurunga, ā, ko te nui o te whāngai o te waea Ca he nui ake i te 0.25kg/t maitai, e piki ake ai te utu. Hei tāpiri, ina nui te nui o te whāngai o te raina Ca, ka koropupū te maitai rewa, ā, ko te pikinga o te taumata o te maitai rewa ka momihia te maitai rewa ki roto, ka puta he waikura tuarua.
(3)Maimoatanga korehau VD: tukuna te maitai rewa kua parakorehia ki te teihana VD mō te maimoatanga korehau, puritia te korehau i raro i te 65pa mō te neke atu i te 20 meneti kia mutu ra ano te huka o te para, whakatuwheratia te taupoki korehau, ka pupuhihia te hauhā ki raro o te koko hei pupuhi pūmau i te maitai rewa.
Wā tuku: Hepetema-02-2022
