Tsarin tacewa da tsarkakewa na arsenic

Tsarin tacewa da tsarkakewa na arsenic hanya ce da ke amfani da bambancin da ke cikin canjin arsenic da mahaɗanta don rabawa da tsarkakewa, musamman ma ya dace da cire sulfur, selenium, tellurium da sauran ƙazanta a cikin arsenic.Ga muhimman matakai da la'akari:

1.Maganin kayan da aka riga aka yi amfani da su

• Tushen sinadarin arsenic mai guba: yawanci a matsayin wani abu da ya rage narke ma'adanai masu ɗauke da arsenic (misali arsenite, realgar) ko kuma sharar da ke ɗauke da arsenic da aka sake yin amfani da ita.
• Gasawa da iskar oxygen(zaɓi ne): Idan kayan da aka yi amfani da su wajen samar da sinadarin arsenic sulfide ne (misali As₂S₃), sai a fara gasa shi domin ya koma mai canzawa As₂O₃

As2S3+9O2→As2O3+3SO2As2S3+9O2→ Kamar yadda2O3+3SO2

2.Na'urar tacewa

• Kayan aiki: Quartz ko yumbu mai kauri (mai jure tsatsa, mai jure zafi mai yawa), sanye take da bututun mai da kwalbar karɓa.
• Kariyar da ba ta da ƙarfi: Ana shigar da sinadarin nitrogen ko carbon dioxide don hana haɗarin iskar shaka ko fashewa arsenic (turɓar arsenic tana iya kama da wuta).

3.Tsarin tacewa

• Kula da zafin jiki:
  • Arsenic sublimation: As₂O₃ sublimation a 500-600 °C (tsarkakken arsenic sublimation a kusan 615 °C).
  • Rabuwa da kazanta: ƙazanta masu ƙarancin tafasa kamar sulfur da selenium sun fi lalacewa kuma ana iya raba su ta hanyar raba danshi.
• Tarin danshiTururin Arsenic yana taruwa zuwa tsarki mai yawa kamar yadda yake a cikin yankin danshi (100-200°C) ko kuma sinadarin arsenic mai yawa).

4.Bayan sarrafawa

• Ragewa(idan ana buƙatar sinadarin arsenic): Rage As₂O₃ da carbon ko hydrogen

As2O3+3H2→2As+3H2OAs2O3+3H2→2As+3H2O

• na'urar tace iska: ƙarin tsarkake sinadarin arsenic don cire sauran ƙazanta masu canzawa.

5.Matakan kariya

• Kariyar guba: Duk aikin yana rufe, sanye take da kayan aikin gano ɓullar arsenic da kuma kayan aikin gaggawa.
• Maganin iskar gas ta wutsiyaBayan danshi, iskar gas ɗin wutsiya yana buƙatar a sha ta ruwan lye (kamar NaOH) ko kuma a kunna shaƙar carbon don guje wa As₂O₃fitar da hayaki.
• Ajiyar ƙarfe ta arsenic: an adana shi a cikin yanayi mara motsi don hana iskar shaka ko bushewa.

6. TsarkakaIngantawa

• Distillation mai matakai da yawa: Maimaita narkewar ruwa zai iya inganta tsarkin zuwa fiye da kashi 99.99%.
• Narkewar yanki (zaɓi): A tace sinadarin arsenic na fili domin ƙara rage ƙazantar ƙarfe.

Fagen aikace-aikace

Ana amfani da sinadarin arsenic mai tsafta sosai a cikin kayan semiconductor (misali GaAs)lu'ulu'u), ƙarin kayan haɗin gwal, ko kuma a cikin ƙera gilashin musamman.Dole ne a bi ƙa'idodin muhalli masu tsauri don tabbatar da aminci da kuma zubar da shara yadda ya kamata.