Ndarama Cyanidation Plant Cyanide Wastewater Treatment Methods

In Gold Cyanidation Plants, kunyange vamwe Cyanide Wastewater inodzokororwa, ichiripo cyanide mvura yetsvina kana cyanide masara ari kuraswa. Cyanide ine muchetura zvakanyanya, saka kurapwa kwehunyanzvi kweiyi tsvina yecyanide kwakakosha isati yaburitswa kudzivirira kusvibiswa kwezvakatipoteredza uye kukanganisa hutano hwevanhu nemhuka. Parizvino, zvinotevera zvakajairika cyanide wastewater kurapwa nzira mugoridhe cyanidation zvidyarwa.

Nzira dzekurapa dzepakati uye yakaderera Concentration Cyanide Wastewater

Alkaline Chlorination Method

Nzira yealkaline chlorination inzira inoshandiswa zvakanyanya. Munzira iyi, chlorine oxidant ine high charge oxidation state inowedzerwa mumvura yakasviba yealkaline cyanide. Ma oxidant akajairika anosanganisira ClO₂, Cl₂ (gasi nemvura), bleaching powder, sodium hypochlorite, calcium hypochlorite, uye chlorite. Mu alkaline solution, OCl⁻ kana high - charge chloride oxidation inowanzo gadzirwa. Kutanga, cyanide ino oxidized kuita cyanate, uye yozo oxidized kuita Carbon dioxide ne nitrogen.

• Zvakanakira : Ma reagents aya anowanikwa zvakanyanya uye haadhuri. Mugumisiro wekurapa wakanaka, uye michina inoshandiswa iri nyore, zviri nyore kuita otomatiki.

• Zvakashata : Sezvo cyanogen chloride inogadzirwa ine chepfu, inokuvadza zvikuru kune vanoshandisa. Cyanogen chloride kana yakabatana nemvura inogona kuburitsa utsi hunoparadza, zvichikonzera kukuvara kukuru kumidziyo.

Inco Method

Iyo Inco nzira yakagadzirwa neInco Ltd. muna 1982. Inonyanya kusanganisira kuwedzera musanganiswa weSO₂ uye mhepo kumvura yakasvibiswa yecyanide uye kutonga pH kukosha pakati pe8 - 10. Divalent copper ions inokonzera oxidation ye cyanide mumvura yakasvibiswa.

• Zvakanakira : Nzira yeInco iri nyore, uye michina inoshandiswa haina kuoma. Mhedzisiro yekurapa inowanzo kuve nani pane nzira ye chlorination (pasina kufunga nezve chepfu ye thiocyanate). Manyuko e reagent akafara, uye mari inoshandiswa yakaderera pane ye alkaline chlorination process.

• Zvakashata : Nzira yeInco ine dambudziko rekuti SCN⁻ oxidize, uye SCN⁻ inogona kuparadzanisa CN⁻ gare gare, saka haina kukodzera kurapa mvura yakasviba yecyanide neSCN⁻ yakawanda. SO₂ inosvibisawo mweya uye inogona kubuda nekubuda mvura panguva yekuchinja kwemvura, zvichisvibisa nharaunda.

H₂O₂ Oxidation Nzira

Pasi pemamiriro epH kukosha kwe9.5 - 11. tembiricha yakajairika, uye copper (Cu²⁺) ions secatalyst, H₂O₂ oxidize cyanide kugadzira CNO⁻. CNO⁻ ichawedzerwa hydrolyzed kugadzira NH₄⁺ uye CO₃²⁻, uye mwero wehydrolysis unoenderana nepH.

• Zvakanakira : Kurapa kwemvura yakasviba yecyanide kwakanaka, uye maitiro acho ari nyore. Nzira ye oxidation yakakodzera kurapa mvura yakasviba yecyanide ine huwandu hwakaderera, uye huwandu hwecyanide mushure mekurapa hunenge huri pasi pe0.5mg/L.

• Zvakashata : H₂O₂ ine chepfu uye inoparadza, saka kutakurwa kwayo nekushandiswa kwayo kune njodzi. Nzira yekuoxidation ine dambudziko mukuoxidation yeSCN⁻ mumvura yakasviba, uye mvura yakasviba yakanatswa ichiri ine chepfu.

Ozone Oxidation Nzira

Ozone ine simba rakasimba reoxidation, ine electrode inogona kuita 2.07mV, yechipiri chete kune fluorine. Inogona kuora nyore nyore zvikamu zvisingakwanisi kusvibiswa nemamwe maoxidants. Iyo kemikari yekuita mashandiro eiyo ozone oxidation process ndeyekuti ozone inopindirana ne cyanide kuti ibudise cyanide, iyo inozoitwa hydrolyzed kugadzira nitrogen uye carbonate.

• Zvakanakira : Zvinongoda michina chete kugadzira ozone uye hazvidi kutenga nekutakura makemikari. Maitiro acho ari nyore uye ari nyore, pasina kusvibiswa kwechipiri.

• Zvakashata : Nekuda kwekudhura kwakanyanya kwemagetsi ekugadzira ozone uye kuoma kwekugadzirisa michina, pane zvimwe zvipingamupinyi mumaindasitiri. Nzira yekuisa ozone oxidation inoshandisa magetsi akawanda, saka zvakaoma kushandisa munzvimbo dzisina simba rakakwana.

Kurapa Nzira dzePamusoro - Concentration Cyanide Wastewater

Acidification Method

Iyo acidification nzira inogona kurapa yakawanda yeakakwira - concentration cyanide mhinduro (60 × 10⁻⁶ + NaCN) inoburitswa kubva mumafekitori. Iko kusanganiswa kwemahara cyanide ions mune mhinduro inogona kuderedzwa kusvika 1 × 10⁻⁶.

• Zvakanakira : Inogona kuwedzera kudzoreredzwa kwecyanide, kudzokorodza zviwanikwa, uye ine mabhenefiti makuru ehupfumi.

• Zvakashata : Mari inodyarwa kamwe chete yakakura zvakanyanya, uye mamwe mabhizinesi madiki nepakati haakwanise kuibhadhara. Kushanda kwayo kwakaoma, uye mushonga wakarapwa uchiri kunetseka kusvika padanho rekuti usvitse mvura.

Natural Degradation Method

Nzira yekudzikira kwechisikigo inzira yekuchenesa inosvibisa cyanide uchishandisa zvinhu zvakasikwa sechiedza. Inosanganisira mhedzisiro yecyanide volatilization, decomposition, oxidation, photochemical degradation, biodegradation, precipitation, uye adsorption, inova mhedzisiro yekuomesesa kwakazara mhedzisiro yemuviri chemistry, photochemistry, uye biochemistry.

• Zvakanakira : Nzira yekuchenesa ganda nenzira yechisikigo inogona kuzadzisa chinangwa chekubvisa cyanide pasina michina kana chero makemikari, saka mutengo wacho wakaderera zvikuru.

• Zvakashata : Maitiro acho anononoka zvikuru, uye mvura yakasviba yakagadziriswa haigone kuzadzisa zvinodiwa pakuburitsa mvura.

Mbiri - Stage Precipitation Method

Iyo mbiri - nhanho yekunaya kwemvura inzira inoshanda yakavharwa - loop yakazara - nzira yekutenderera yakagadziridzwa kune zvidiki uye zvepakati - saizi yegoridhe cyanidation zvidyarwa zvine yakakwirira - concentration SCN⁻ mvura yetsvina, inogona kuwana "zero discharge" yetsvina. Iyo miviri - nhanho yekunaya kwemvura inonyanya kusanganisira kuwedzera catalyst uye oksijeni yakakwana kune cyanide mumvura yetsvina, uyezve kubvisa cyanide kuburikidza neanotevera maitiro pane goridhe - inotakura zvinhu.

2Cu⁺ + 2SCN⁻→Ku₂(SCN)₂↓

Ca²⁺ + SO₄²⁻→CaSO₄↓

Pb²⁺ + SO₄²⁻→PbSO₄↓

H⁺ + CN⁻→HCN

• Zvakanakira : Inogona kubvisa ma ioni esimbi inorema mumushonga uye kuita kuti mvura yakasviba idzokororwe.

• Zvakashata : Danho rekutanga remvura rinofanira kunge rapera. Kana zvisina kudaro, kana muchiwedzera alkali, cuprous rhodanate ichanyunguduka zvakare, zvichikanganisa mhedzisiro yekurapa. CaSO₄ isina mvura inogona kukonzera kuvharika kwevharuvhu.

Idzi ndidzo dzakajairwa cyanide tsvina yekurapa nzira mugoridhe cyanidation zvidyarwa. Pamusoro peiyo cyanide iri pamusoro - nzira dzekubvisa, kuderedza kushandiswa kwecyanide mune yegoridhe cyanidation process kunogonawo kuderedza kubuda kweiyo cyanide tsvina.