Ko te purenga o te selenium parakore-teitei (≥99.999%) he whakakotahitanga o ngā tikanga ā-tinana me ngā tikanga matū hei tango i ngā poke pēnei i te Te, Pb, Fe, me te As. Ko ngā tukanga me ngā tawhā matua ēnei:
1. Te Whakamakuku Korehau
Rere Tukanga:
1. Whakanohoia te selenium mata (≥99.9%) ki roto i te oko quartz i roto i te oumu whakakore korehau.
2. Whakamahanahia ki te 300-500°C i raro i te korehau (1-100 Pa) mō te 60-180 meneti.
3. Ka whakapūpū te kohu selenium i roto i te whakapūpū e rua ngā wāhanga (te wāhanga o raro me ngā matūriki Pb/Cu, te wāhanga o runga mō te kohikohinga selenium).
4. Kohia te selenium mai i te pūwhakapūmau o runga; ka noho tonu te 碲(Te) me ētahi atu poke e koropupū ana ki te wāhanga o raro.
Ngā tawhā:
- Pāmahana: 300-500°C
- Pēhanga: 1-100 Pa
- Rauemi whakamātao: Kuata, maitai kore waikura rānei.
2. Te Whakamaarama Matū + Te Whakamaarama Korehau
Rere Tukanga:
1. Te tahunga waikura: Tauhohe te selenium mata (99.9%) ki te O₂ i te 500°C hei hanga i ngā hau SeO₂ me TeO₂.
2. Tangohanga Whakarewa: Whakarewahia te SeO₂ ki roto i te otinga etanoru-wai, tātarihia te matūriki TeO₂.
3. Whakaiti: Whakamahia te hydrazine (N₂H₄) hei whakaiti i te SeO₂ hei selenium taketake.
4. Te Whakaiti i te Te Hōhonu: Whakahāngaihia anō te selenium ki te SeO₄²⁻, kātahi ka tangohia te Te mā te whakamahi i te tango whakarewa.
5. Te Whakamakuku Korehau Whakamutunga: Whakamaaramahia te selenium i te 300-500°C me te 1-100 Pa kia eke ki te 6N (99.9999%) te parakore.
Ngā tawhā:
- Te pāmahana waikura: 500°C
- Te horopeta o te hydrazine: Tāpirihia kia nui rawa hei whakaiti i te nui.
3. Te Whakamaarama Hikohiko
Rere Tukanga:
1. Whakamahia he irahiko hiko (hei tauira, te waikawa selenous) me te mātotoru o te iahiko o te 5-10 A/dm².
2. Ka putunga te selenium ki runga i te cathode, ko ngā waikura selenium ka memeha haere i te anode.
Ngā tawhā:
- Te mātotoru o te au: 5-10 A/dm²
- Irahikohiko: Waikawa seleniuma, wairewa selenate rānei.
4. Tangohanga Whakarewa
Rere Tukanga:
1. Tangohia te Se⁴⁺ mai i te otinga mā te whakamahi i te TBP (tributyl phosphate) te TOA rānei (trioctylamine) i roto i te waikawa hauwaiora, waikawa whanariki rānei.
2. Tangohia te selenium, kātahi ka whakapūpūtia anō.
Ngā tawhā:
- Tangohanga: TBP (waihanga HCl) TOA rānei (waihanga H₂SO₄)
- Te maha o ngā wāhanga: 2-3.
5. Te Rewa o te Rohe
Rere Tukanga:
1. Whakarewahia ngā poro selenium kia maha ngā wā hei tango i ngā paru iti.
2. He pai mō te whakatutuki i te parakore >5N mai i ngā rauemi tīmatanga parakore-teitei.
Kia mōhio: Me whai taputapu motuhake, ā, he nui te pūngao e pau ana.
Whakaaro Tauira
Mō te tirohanga ā-kanohi, tirohia ngā tatauranga e whai ake nei mai i ngā tuhinga:
- Tatūnga Whakatōtō Korehau: Kauwhata o tētahi pūnaha whakatōtō e rua ngā wāhanga.
- Kauwhata Āhuatanga Se-Te: E whakaatu ana i ngā wero wehenga nā ngā pūwāhi kohua tata.
Ngā Tohutoro
- Te whakamātao korehau me ngā tikanga matū:
- Te tango hikohiko me te tango whakarewa:
- Ngā tikanga matatau me ngā wero:
Wā tuku: Maehe-21-2025