Te Mahi a te Alumina Ma i roto i te Makanga Pūtea
1. Rauemi Anga Whakarewa Pūtea
Alumini mā kua hanumika hangaia mā te whakakotahi i te alumina ahumahi kounga teitei i ngā pāmahana neke atu i te 2000°C. He tino parakore tōna (α-Al₂O₃ihirangi > 99–99.6%) me te ātete teitei o te tau 2050°C–2100°C, me te tauwehenga whakawhānui wera iti (tata ki te 8×10⁻⁶/°C). Nā ēnei āhuatanga ka waiho hei huarahi pai hei whakakapi i te onepu zircon tuku iho hei rauemi anga matua mō te whakarewanga haumi. Ko tōna ōritetanga matūriki teitei (te tohatoha rahi o te witi > 95%) me te marara pai ka āwhina i te hanga i ngā pokepokea kiato ake, kia pakari ake, ka whakapai ake i te mutunga o te mata whakarewa me te tika o ngā āhuatanga me te whakaiti i ngā reiti hapa.
2. Whakakaha i te pokepokea ai
He pakeke Mohs o te 9.0, ā, he tino pai te pupuri i te kaha pāmahana teitei (e pupuri ana i te pono i runga ake i te 1900°C),alumina kua hanumi māka whakaroa i te roa o te mahi pokepokea ai mā te 30–50%. Ina whakamahia ki roto i ngā pokepokea ai, ki ngā matua rānei mō te rino maka, te maitai maka, ngā koranu kore-whakarewa rānei, ka ātete pai ki te horo o te rere o te konganuku, ā, ka whakaiti i te auau o ngā whakatikatika me ngā tiaki.
Ngā Painga o te Alumina Whakakotahi Ma
(1) Te Pūmautanga o te Mahana-Tiketike
Alumini mā kua hanumiHe tino pai te pumau o te pāmahana matū i te wā e whakarewaina ana. Ko tōna tauwehenga whānui wera he tata ki te kotahi-hautoru o ngā rauemi tuku iho, ā, ka āwhina i te ārai i te pakaru o te pokepokea ai, te whakarerekētanga rānei o te whakarewanga nā ngā huringa pāmahana ohorere. He iti te putanga hau (tukunga hau < 3 ml/g) ka whakaiti i te pūngao me ngā hapa o te pūngao hau.
(2) Te Kounga o te Whakaotinga o te Mata
Ina whakamahia hei paura whakakoi pai (rahi o te witi 0.5–45μm),alumina kua hanumi māka tukuna he pakū ōrite, he ōrite hoki, ka taea ai te whakatutuki i te taratara o te mata whakarewa o Ra < 0.8μm. Nā tōna āhua whakakoi-ake (te tere pakaru < 5%) ka pumau te pai o te tapahi me te hua oro pumau.
(3) Te Whakarerekētanga o te Tukanga
Kei a mātou ngā rahi kōpura whakarerekētanga mai i te F12 ki te F10000 kia rite ki ngā momo tukanga whakarewa:
Ngā karaehe taratara (F12–F100): Mō te tukunga pokepokea ai i roto i ngā hanganga uaua, ka piki ake te reiti angitu o te tango pokepokea ai mā te neke atu i te 25%.
Ngā momo pai (F220–F1000): Mō te whakaputa i ngā matua uku tino tika me ngā ātete hanga kia piripono±0.1 mm.
3. Uara Arotau Tukanga
(1) Te Whai Hua o te Utu
Te whakakapi i te onepu zircon kialumina kua hanumi mā ka taea te whakaiti i ngā utu rauemi mā te 30–40%. Ka taea hoki te whakaiti i te matotoru o te anga mā te 15%.–20% (te matotoru o te anga noa: 0.8–1.2 mm), e whakapoto ana i te huringa hanga anga.
(2) Ngā Painga Taiao
He tino iti te ihirangi konganuku taumaha (< 0.01%), ā, ka tutuki i te alumina ma kua hanumi ngā paerewa taiao ISO 14001. Ka taea te hangarua 100% te onepu para, ā, ka taea te whakamahi anō i roto i te hanga whakarewa.
Ngā tono kua whakamātauhia
Kua whānuitia te whakamahi i tēnei rauemi i roto i ngā mara papai pērā i ngā mata tāpine rererangi me ngā whakarewanga tika o ngā taputapu hauora. E whakaatu ana ngā āhuatanga noa ka taea e ia te whakanui ake i ngā reiti paahitanga hua mai i te 85% ki te 97%.