Electrolytic Oxidation txheej txheem rau kev kho Sodium Cyanide Wastewater

Introduction

Cyanide - cov dej khib nyiab uas muaj cyanide, tshwj xeeb yog cov uas tau los ntawm Sodium Cyanide , yog qhov teeb meem loj rau ib puag ncig. Cov dej khib nyiab no muaj tshuaj lom heev thiab feem ntau yog los ntawm kev lag luam xws li electroplating, kev tsim roj, coking, metallurgy, kev ua hlau, tshuaj fiber, yas, tshuaj tua kab, thiab kev lag luam tshuaj lom neeg. Hauv dej, nws tsis ruaj khov thiab yooj yim lwj. Ob qho tib si inorganic thiab organic cyanides yog cov tshuaj lom heev. Piv txwv li, qhov koob tshuaj cyanide uas ua rau tib neeg tuag tau yog 0.18 g, thiab potassium cyanide yog 0.12 g. Tsis tas li ntawd, qhov concentration ntawm cyanide uas ua rau ntses tuag tau hauv dej yog txij li 0.04 - 0.1 mg/L. Yog li ntawd, cov txheej txheem kho mob zoo yog qhov xav tau sai sai kom txo nws qhov cuam tshuam tsis zoo rau ib puag ncig thiab tib neeg kev noj qab haus huv.

Lub hauv paus ntawm Electrolytic Oxidation rau Cyanide - muaj cov dej khib nyiab

Cov txheej txheem Electrolytic oxidation rau kev kho cov dej khib nyiab Sodium cyanide ua haujlwm raws li lub hauv paus ntsiab lus ntawm kev siv hluav taws xob los tsav cov tshuaj tiv thaiv ntawm anode thiab cathode, yog li hloov cov cyanide hauv cov dej khib nyiab mus rau hauv cov tshuaj uas tsis muaj kev phom sij. Hauv cov txheej txheem no, ob qho tib si cyanide yooj yim thiab cyanide nyuaj hauv cov dej khib nyiab raug electrolysis.

Cov tshuaj tiv thaiv anode

• Rau Simple Cyanide : Thaum lub sijhawm thawj zaug ntawm qhov anode, simple cyanide reacts nrog lwm yam khoom hauv cov dej khib nyiab kom tsim tau cov tshuaj lom tsawg dua. Hauv theem thib ob tom qab, muaj ob qhov kev cuam tshuam tshwm sim. Ib qho kev cuam tshuam ntxiv rhuav cov tshuaj no ua Carbon dioxide, nitrogen, thiab dej. Lwm qhov kev cuam tshuam ua rau muaj ammonium.

• Rau Kev Sib Koom Tes Cyanide (Siv Tooj Liab - uas muaj Complex ua piv txwv) : Thaum kev sib koom tes cyanide, zoo li tooj liab - uas muaj complexes, mus txog qhov anode, nws ua rau muaj cov ions tooj liab thiab lwm yam tshuaj lom tsawg dua. Thaum ntxiv ntsev rau hauv cov electrolytic medium, cov tshuaj ntxiv tshwm sim. Cov ions chloride los ntawm cov ntsev raug oxidized los ua cov chlorine tshiab. Cov chlorine tshiab no tom qab ntawd ua rau muaj cyanide thiab lwm yam tshuaj hauv cov dej khib nyiab kom rhuav tshem cov tshuaj cyanide ua cov khoom tsis muaj teeb meem, suav nrog carbon dioxide, nitrogen, thiab chloride ions.

Cathode Reactions

Ntawm cathode, hydrogen ions nce electrons thiab tsim hydrogen gas. Rau cov hlau - muaj cov cyanide complexes, xws li cov tooj liab, tooj liab ions nce electrons thiab tuaj yeem tso ua tooj liab. Hauv qee qhov xwm txheej, tooj liab ions kuj tuaj yeem hnov ​​​​mob nrog hydroxide ions los ua tooj liab hydroxide precipitate.

Cov ntsiab lus tseem ceeb hauv cov txheej txheem Electrolytic Oxidation

• Cov Khoom Siv Hluav Taws Xob : Kev xaiv cov khoom siv hluav taws xob yog qhov tseem ceeb heev. Hauv ntau qhov xwm txheej, cov hlau tsis muaj zog tuaj yeem siv ua cov khoom siv cathode. Txawm li cas los xij, cov anodes yuav tsum tiv taus qhov chaw electrochemical hnyav. Cov anodes ruaj khov (DSA), uas yog ua los ntawm cov hlau oxides zoo thiab tsim los ntawm ntau lub tuam txhab, zoo rau daim ntawv thov no. Graphite kuj tseem tuaj yeem ua cov khoom siv anode, tab sis nws muaj qhov tsis zoo ntawm kev maj mam noj thaum lub sijhawm electrolysis.

• Kev Tswj Kub : Qhov kub ntawm cov kua pov tseg thaum lub sijhawm electrolysis yuav tsum tau tswj kom zoo. Feem ntau nws yuav tsum khaws cia qis dua 25 ° C. Yog tias qhov kub nce siab dhau, cov chlorine tsim los ntawm kev oxidation ntawm chloride ions hauv cov ntsev ntxiv yuav tawm ua ntej nws tuaj yeem cuam tshuam nrog cyanide, yog li txo qhov ua tau zoo ntawm cov txheej txheem cyanide - kev rhuav tshem.

• Ntxiv Chloride Ion : Ntxiv chloride ions rau hauv cov dej khib nyiab tuaj yeem ua rau electrolytic oxidation ntawm cyanide zoo dua. Feem ntau, ntxiv 1 - 2 g/L ntawm chloride ions txaus. Qee zaum, ntxiv ntsev (sodium chloride) ntawm qhov concentration ntawm 25 g ib litre rau hauv cov dej khib nyiab tau pom tias pab tau zoo hauv electrolytic rhuav tshem cyanide.

Qhov zoo ntawm cov txheej txheem Electrolytic Oxidation

• Kev Ua Haujlwm Zoo Rau Cov Dej Khib Nyhiab Uas Muaj Cov Tshuaj Cyanide Ntau : Cov txheej txheem electrolytic oxidation zoo tshwj xeeb rau kev kho cov dej khib nyhiab uas muaj cov tshuaj cyanide ntau, xws li cov uas pom hauv cov chaw khawb kub. Nws tuaj yeem txo qhov concentration cyanide hauv cov dej khib nyhiab.

• Kev Tsim Cov Hom Tshuaj Uas Muaj Teeb Meem Hauv Qhov Chaw : Thaum lub sijhawm electrolysis, cov hom tshuaj uas muaj teeb meem xws li cov chlorine uas tseem tshiab tau tsim tawm hauv lub cev. Qhov no tshem tawm qhov xav tau ntxiv cov tshuaj oxidizing uas muaj peev xwm ua rau muaj kev phom sij thiab kim heev rau sab nraud ntau heev.

• Kev Ywj Pheej : Cov txheej txheem tuaj yeem hloov kho raws li cov khoom sib xyaw tshwj xeeb ntawm cov dej khib nyiab. Los ntawm kev tswj cov kev ntsuas xws li qhov ceev tam sim no, qhov hluav taws xob, thiab kev ntxiv qee cov ntsev, cov txheej txheem electrolytic oxidation tuaj yeem ua kom zoo dua rau ntau hom dej khib nyiab uas muaj cyanide, txawm tias lawv muaj cov tshuaj cyanide yooj yim lossis nyuaj.

xaus

Cov txheej txheem electrolytic oxidation muab ib qho kev daws teeb meem zoo rau kev kho cov dej khib nyiab sodium cyanide . Los ntawm kev nkag siab txog cov tshuaj lom neeg uas tshwm sim ntawm anode thiab cathode, ua tib zoo xaiv cov khoom siv electrode, tswj qhov kub, thiab ntxiv cov chloride ions kom raug, txoj kev no tuaj yeem tshem tawm cov pa phem cyanide ntawm cov dej khib nyiab. Thaum cov lag luam txuas ntxiv nrhiav txoj hauv kev ruaj khov thiab ua haujlwm tau zoo dua los tswj lawv cov khib nyiab, cov txheej txheem electrolytic oxidation yuav tau txais kev siv dav dua hauv kev kho cov dej khib nyiab uas muaj cyanide. Txawm li cas los xij, tseem xav tau kev tshawb fawb thiab kev txhim kho ntxiv los txhim kho cov txheej txheem, txo cov nqi, thiab txhim kho nws cov txiaj ntsig zoo thiab kev phooj ywg ib puag ncig.