High Purity Selenium Purification Processes

ʻO ka hoʻomaʻemaʻe ʻana i ka selenium maʻemaʻe kiʻekiʻe (≥99.999%) e pili ana i ka hui pū ʻana o nā ʻano hana kino a me nā kemika e wehe i nā haumia e like me Te, Pb, Fe, a me As. Eia nā kaʻina hana nui a me nā ʻāpana:

1. Hoʻomāmā

Kaʻina hana:

1. E hoʻokomo i ka selenium maʻemaʻe (≥99.9%) i loko o ke kīʻaha quartz i loko o ka umu hoʻoheheʻe māma.

2. E wela i ka 300-500 ° C ma lalo o ka momi (1-100 Pa) no nā minuke 60-180.

3. Hoʻokuʻu ʻia ka mahu Selenium i loko o kahi condenser ʻelua-pae (pae haʻahaʻa me nā ʻāpana Pb/Cu, pae luna no ka hōʻiliʻili selenium).

4. E hōʻiliʻili i ka selenium mai ka condenser luna; 碲(Te) a me nā mea haumia kiʻekiʻe e hoʻolapalapa ʻia e noho ma ka pae haʻahaʻa.

Nā ʻāpana:

- Ka wela: 300-500°C

- Paʻi: 1-100 Pa

- Mea condenser: Quartz a i ʻole ke kila kila.

2. Hoʻomaʻemaʻe Kemika + Hoʻomaʻemaʻe Vacuum

Kaʻina hana:

1. Hoʻohuhi ʻana: E hana i ka selenium maʻemaʻe (99.9%) me O₂ ma 500°C e hana i nā kinoea SeO₂ a me TeO₂.

2. Hoʻoheheʻe Solvent: E hoʻoheheʻe i ka SeO₂ i loko o ka wai ethanol, kānana i ka wai o TeO₂.

3. Ho'ēmi: E hoʻohana i ka hydrazine (N₂H₄) e hoʻemi i ka SeO₂ i elemental selenium.

4. Deep De-Te: E hoʻoheheʻe hou i ka selenium iā SeO₄²⁻, a laila e unuhi iā Te me ka hoʻohana ʻana i ka solvent extraction.

5. Hoʻomaʻemaʻe Vacuum Distillation: E hoʻomaʻemaʻe i ka selenium ma 300-500 ° C a me 1-100 Pa e loaʻa ai ka maʻemaʻe 6N (99.9999%).

Nā ʻāpana:

- Ka wela hoʻonanea: 500°C

- Hydrazine dosage: ʻoi aku e hōʻoia i ka hōʻemi piha.

3. Hoomaemae Electrolytic

Kaʻina hana:

1. E hoʻohana i ka electrolyte (e laʻa, selenous acid) me ka mānoanoa o kēia manawa o 5-10 A/dm².

2. Hoʻokomo ʻia ka selenium ma ka cathode, ʻoiai e hoʻoheheʻe ʻia ka selenium oxides ma ka anode.

Nā ʻāpana:

- Māmā o kēia manawa: 5-10 A/dm²

- Electrolyte: Selenous acid a i ʻole ka hopena selenate.

4. Wehewehe Wehewehe

Kaʻina hana:

1. Wehe iā Se⁴⁺ mai ka hoʻonā me ka hoʻohana ʻana i ka TBP (tributyl phosphate) a i ʻole TOA (trioctylamine) i loko o ka media hydrochloric a i ʻole sulfuric acid.

2. Wehe a hoʻoheheʻe i ka selenium, a laila hana hou.

Nā ʻāpana:

- Mea hoʻoheheʻe: TBP (HCl medium) a i ʻole TOA (H₂SO₄ medium)

- Ka helu o nā pae: 2-3 .

5. He'ehehe'e

Kaʻina hana:

1. Hoʻoheheʻe pinepine ʻia nā ʻāpana selenium e wehe i nā mea haumia.

2. He kūpono no ka loaʻa ʻana o ka maʻemaʻe> 5N mai nā mea hoʻomaka maʻemaʻe kiʻekiʻe.

'Ōlelo Aʻo: Pono nā mea hana kūikawā a me ka ikaika o ka ikehu .

Manaʻo Kiʻi

No ka ʻike maka, e nānā i nā kiʻi ma lalo mai ka palapala.

- Hoʻonohonoho ʻana i ka hoʻoheheʻe ʻana i ka ʻūhā: Hoʻolālā o kahi ʻōnaehana condenser ʻelua pae.