Arsenic distillation uye nzira yekuchenesa

Iyo arsenic distillation uye yekuchenesa nzira inzira inoshandisa mutsauko mukusagadzikana kwearsenic nemakomponi ayo kuti aparadzanise uye achenese, kunyanya akakodzera kubvisa sarufa, selenium, tellurium uye mamwe matsvina muarsenic.Heano matanho akakosha uye kufunga:

1.Raw material pretreatment

• Kunobva arsenic isina kusimba: kazhinji sechigadzirwa chekunyungudutswa kwemaminerari ane arsenic (eg arsenite, realgar) kana tsvina ine arsenic yakadzokororwa.
• Oxidative roasting(sarudzo): Kana iyo mbishi iri arsenic sulfide (semu As₂S₃), inoda kutanga yakagochwa kuti ishandurwe kuita inoputika As₂O₃

As2S3+9O2→As2O3+3SO2As2S3+9O2→As2O3+3SO2

2.Distillation unit

• Equipment: Quartz kana ceramic ichiri (isingadziviriki, inodzivirira tembiricha yakakwira), ine condenser chubhu uye bhodhoro rekugamuchira.
• Inert kudzivirira: Nitrogen kana carbon dioxide inounzwa kudzivirira arsenic oxidation kana njodzi yekuputika (arsenic vapor inopfuta).

3.Distillation process

• Kudzora tembiricha:
  • Arsenic sublimation: As₂O₃ sublimation pa500-600 °C (pure arsenic sublimation panenge pa615 °C).
  • Kuparadzaniswa kwetsvina: kusvibiswa kwakaderera-kubikira kwakadai sesarufa uye selenium zvinonyanya kunyungudutswa uye zvinogona kuparadzaniswa nesegmented condensation.
• Condensation collection: Arsenic vapor inonyunguduka kuita yakakwira-kuchena As₂O₃ kana elemental arsenic munzvimbo ye condensation (100-200°C).

4.Post-processing

• Kuderedza(kana elemental arsenic ichidikanwa): Kuderedzwa kweAs₂O₃ nekabhoni kana hydrogen

As2O3+3H2→2As+3H2OAs2O3+3H2→2As+3H2O

• Vacuum distillation: kumwe kucheneswa kwe elemental arsenic kubvisa tsvina yasara inoshanduka.

5.Zvekungwaririra

• Chepfu kudzivirira: Iyo yese maitiro akavharwa oparesheni, ane arsenic leakage yekuona uye nekukurumidzira kurapwa michina.
• Muswe gasi kurapwa: Mushure mekunyungudutswa, gasi remuswe rinoda kunyudzwa nemushonga we lye (senge NaOH) kana activated carbon adsorption kudzivirira As₂O₃zvinobuda.
• Arsenic simbi yekuchengetedza: yakachengetwa mumhepo inert kudzivirira oxidation kana deliquescent.

6. KuchenaKuwedzera

• Multi-stage distillation: Kudzokororwa distillation kunogona kuvandudza kuchena kusvika kupfuura 99.99%.
• Zone melting (sarudzo): Kukwenenzvera kwenzvimbo ye elemental arsenic kuti iwedzere kuderedza kusvibiswa kwesimbi.

Minda yekushandiswa

Yakakwira-kuchena arsenic inoshandiswa mune semiconductor zvinhu (semuenzaniso GaAsmakristasi), alloy additives, kana mukugadzira magirazi akakosha. Processes inofanirwa kutevedzera mitemo yakasimba yezvakatipoteredza kuti ive nechokwadi chekuchengeteka uye kutevedza kuraswa kwemarara.