Arsenic distillation le mokhoa oa ho hloekisa

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Arsenic distillation le mokhoa oa ho hloekisa

Ts'ebetso ea arsenic distillation le ho hloekisa ke mokhoa o sebelisang phapang pakeng tsa ho fetoha ha arsenic le metsoako ea eona ho arohana le ho hloekisa, haholo-holo e loketseng ho tlosa sebabole, selenium, tellurium le litšila tse ling tsa arsenic.Mehato ea bohlokoa le mehopolo ke ena:


1.Phekolo ea thepa e tala

  • Mehloli ea arsenic e tala: hangata e le sehlahisoa sa ho qhibiliha ha liminerale tse nang le arsenic (mohlala, arsenite, realgar) kapa litšila tse nang le arsenic tse nchafalitsoeng.
  • Ho chesa ka oxidative(ka boikhethelo): Haeba thepa e tala e le arsenic sulfide (mohlala, As₂S₃), e hloka ho besoa pele ho fetoha As₂O₃

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


2.Setsi sa distillation

  • Thepa: Quartz kapa ceramic e ntse e le teng (e hanana le kutu, e hanyetsa mocheso o phahameng), e nang le tube ea condenser le botlolo e amohelang.
  • Tšireletso ea inert: Nitrogen kapa carbon dioxide e hlahisoa ho thibela arsenic oxidation kapa kotsi ea ho phatloha (mouoane oa arsenic o ka tuka).

3.Mokhoa oa distillation

  • Taolo ea mocheso:
    • Arsenic sublimation: As₂O₃ sublimation ho 500-600 °C (sublimation e hloekileng ea arsenic hoo e ka bang 615 °C).
    • Karohano ya ditshila: litšila tse tlase tse belang joalo ka sebabole le selenium li ka chesoa ka mokhoa o ikhethileng 'me li ka aroloa ka condensation e arohaneng.
  • Pokello ea condensation: Mouoane oa arsenic o hola ho ba As₂O₃ kapa elemental arsenic sebakeng sa condensation (100-200°C).

4.Ka mor'a ts'ebetso

  • Phokotso(haeba ho hlokahala arsenic ea mantlha): Phokotso ea As₂O₃ ka carbon kapa hydrogen

As2O3+3H2→2As+3H2OAs2O3+3H2→2As+3H2O

  • Vacuum distillation: tlhoekiso e tsoelang pele ea elemental arsenic ho tlosa litšila tse setseng.

5.Mehato ya tlhokomelo

  • Tšireletso ea chefo: Ts'ebetso eohle e koetsoe ts'ebetso, e nang le lisebelisoa tsa ho lemoha ho lutla ha arsenic le lisebelisoa tsa kalafo ea tšohanyetso.
  • Phekolo ea khase ea mohatla: Ka mor'a condensation, khase ea mohatla e hloka ho monngoa ke tharollo ea lye (joaloka NaOH) kapa activated carbon adsorption ho qoba As₂O₃tlhahiso.
  • Ho boloka tšepe ea arsenic: bolokoa sebakeng se se nang moea ho thibela oxidation kapa deliquescent.

6. BohloekiNtlafatso

  • Multi-stage distillation: Distillation e pheta-phetoang e ka ntlafatsa bohloeki ho feta 99.99%.
  • Ho qhibiliha ha libaka (ka boikhethelo): Ho hloekisoa ha libaka tsa arsenic ho ntlafatsa ho fokotsa litšila tsa tšepe.

Libaka tsa kopo

Arsenic ea boleng bo holimo e sebelisoa ho lisebelisoa tsa semiconductor (mohlala, GaAslikristale), li-additives tsa alloy, kapa ho etsoa ha likhalase tse khethehileng. Pli-rocesses li hloka ho ikamahanya le melao e thata ea tikoloho ho netefatsa polokeho le tumellano ea ho lahla litšila.


Nako ea poso: May-05-2025