High Purity Selenium Purification Processes

Lub purification ntawm high-purity selenium (≥99.999%) suav nrog kev sib xyaw ua ke ntawm lub cev thiab tshuaj lom neeg kom tshem tawm cov impurities xws li, pb, FE, thiab AS. Hauv qab no yog cov txheej txheem tseem ceeb thiab cov tsis muaj:

1. Nqus Distillation

Txheej Txheem Flow:

1. Tso cov crude selenium (≥99.9%) nyob rau hauv ib tug quartz crucible nyob rau hauv lub nqus dej distillation righting righting.

2. Cua sov rau 300-500 ° C hauv qab nqus (1-100 PA) rau 60-180 feeb.

3. Selenium vapor condenses hauv ob-theem condenser (qis theem nrog PB / CU me me rau Selenium sau).

4. Sau Selenium los ntawm cov condenser sab saud; 碲 (te) thiab lwm lub siab-npau paug impurities nyob rau hauv qis theem.

Cov tsis muaj:

- Kub: 300-500 ° C

- Siab: 1-100 PA

- Cov Khoom Siv Khoom Siv Khoom Siv: Quartz lossis Stainless Hlau.

2. Tshuaj Purification + Nqus Distillation

Txheej Txheem Flow:

1. Oxidation combusction: Tsuag tsuag crude selenium (99.9%) nrog O₂ ntawm 500 ° C los ua Seo₂ thiab Teoing Gases.

2. Kev daws teeb meem: Daws hais txog kev tawm tsam hauv ib qho tshuaj ethanol-dej, lim tawm kom ua ntej nag li.

3. Txo: Siv HELLAZINE (N₂H₂) kom txo qis SEO₂ rau kev ua lag luam selenium.

4. Sib sib zog nqus DE-Te: Oxidize Selenium ntxiv rau SEO₄²⁻, tom qab ntawd extract te siv cov kuab tshuaj extraction.

5. Thaum kawg lub nqus tsev distillation: Purify Selenium ntawm 300-500 ° C thiab 1-100 PA kom ua tiav 6n (99.999%) kev coj dawb huv.

Cov tsis muaj:

- Oxidation Kub: 500 ° C

- Hydazine siv: ntau dhau los xyuas kom tiav.

3. Electrolytic purification

Txheej Txheem Flow:

1. Siv cov electrolyte (xws li, selenous acid) nrog qhov ceev tam sim no ntawm 5-10 A / DM².

2. Selenium tso rau ntawm cathode, thaum selenium oxide volatilize ntawm anode.

Cov tsis muaj:

- Nrov ntom ntom tam sim no: 5-10 A / DM²

- electrolyte: selenous acid lossis selenate daws.

4. Cov tshuaj tiv thaiv kab mob tawm

Txheej Txheem Flow:

1. Extract se⁴⁺ los ntawm kev daws siv TBP (Tributyl phosphate) lossis toa (triocystlamine) hauv hydrocystlamine) hauv cov accochloric lossis sulfuric acid tawm.

2. Quav thiab nag lossis daus selenium, ces recrystallize.

Cov tsis muaj:

- Extractant: TBP (HCL Nruab Nrab) lossis TOA (HIso₄ Nruab Nrab)

- Tus naj npawb ntawm theem: 2-3.

5. Lub chaw melting

Txheej Txheem Flow:

1. Ntau dua cheeb tsam-yaj selenium Ingots kom tshem tawm cov kab impurities.

2. Haum rau kev ua tiav> 5n kev coj dawb huv los ntawm kev pib ua kom siab dua pib cov ntaub ntawv.

Nco tseg: Yuav tsum tau cov khoom siv tshwj xeeb thiab muaj zog-ua kom muaj zog.

Daim Duab Qhia

Rau kev siv, xa mus rau cov duab hauv qab no los ntawm cov ntawv sau:

- Lub tshuab teeb tsa distillation: schematic ntawm ob-theem condenser system.