Cyanidation Kub Extraction txheej txheem thiab zinc hmoov hloov

Cov txheej txheem rho tawm kub Cyanidation ib txwm muaj peb txoj kev tseem ceeb: leaching, ntxuav, thiab hloov (nag).

1. Leaching

Leaching yog txheej txheem uas cov khoom kub hauv cov ore yaj hauv cov pa oxygen - muaj cov tshuaj cyanide. Tam sim no, hais txog cov txheej txheem, cov cuab yeej siv, kev tswj hwm, thiab kev ua haujlwm, cov txheej txheem no tau dhau los ua sophisticated. Raws li tau hais ua ntej, kev tawg ntawm kub hauv cov pa oxygen - muaj cov tshuaj cyanide yog qhov tseem ceeb ntawm cov txheej txheem electrochemical corrosion.

Thaum lub sijhawm leaching, ob hom tshuaj reagents tseem ceeb yog siv: Cyanides thiab cov alkalis tiv thaiv.

(1) Cyanides

Hauv kev lag luam, cov cyanides uas feem ntau siv rau cyanidation leaching ntawm kub suav nrog potassium cyanide (KCN), Sodium cyanide (NaCN), calcium cyanide [Ca(CN)₂], thiab ammonium cyanide (NH₄CN).

Sodium cyanide yog cov cyanide uas siv ntau tshaj plaws hauv kev tsim khoom. Nws yog ib qho hmoov dawb muaj tshuaj lom heev, thiab Sodium Cyanide uas muag hauv khw feem ntau raug nias ua cov pob lossis cov khoom me me.

Hauv kev lag luam, cyanide yaj kuj tseem siv ua cov tshuaj reagent leaching. Nws yog ib qho sib xyaw ua los ntawm kev yaj cov calcium cyanide, ntsev, thiab coke hauv lub cub hluav taws xob. Ntxiv nrog rau muaj 40% - 45% ntawm Ca (CN) ₂ thiab NaCN, nws kuj muaj qee yam tsis huv uas ua rau muaj kev phom sij rau cov txheej txheem cyanidation, xws li cov sulfides yaj tau, carbon, thiab qee yam tsis huv uas yaj tau. Nws qhov zoo yog nws tus nqi qis, tab sis qhov ntau npaum li cas yog loj, kwv yees li 2 - 2.5 npaug ntawm sodium cyanide . Txhawm rau tshem tawm cov kev cuam tshuam ntawm cov tsis huv uas ua rau muaj kev phom sij, kev kho ua ntej yuav tsum tau ua thaum siv cyanide yaj. Cov txheej txheem kho mob suav nrog kev sib xyaw ua ke nrog huab cua lossis ntxiv cov ntsev txhuas kom tsim nyog rau hauv cov tshuaj.

Raws li txoj cai, tsuas yog 0.5g ntawm sodium cyanide yuav tsum tau ua kom yaj 1g ntawm Au. Txawm li cas los xij, hauv kev tsim khoom tiag tiag, kev siv ntawm cyanide yog 20 - 200 npaug ntawm qhov kev xav, lossis ntau dua. Tus nqi ntawm kev noj tsuas yog nyob ntawm cov ntsiab lus ntawm lwm cov khoom hauv cov ore uas tuaj yeem hnov ​​​​mob nrog cyanide.

2. Ntxuav

Kev ntxuav yog cov txheej txheem ntawm kev siv dej los ntxuav qhov saum npoo ntawm ore hais thiab cov kub yaj ntawm cov ore hais kom ua tiav cov khoom - kua sib cais kom rov qab tau cov kub - muaj cov tshuaj tom qab leaching.

3. Hloov

Kev hloov pauv yog cov txheej txheem ntawm kev siv hmoov zinc los txo thiab ua rau kub los ntawm cov kua kub uas muaj, yog li rov qab tau kub. Txij li thaum xyoo pua 20th, kev rov qab tau kub los ntawm cov kua cyanide ua ntej suav nrog kev ntxuav cov kua, tom qab ntawd ua kom meej thiab tshem tawm cov kua cev xeeb tub. Kev ua kom kub los ntawm cov kua cev xeeb tub uas tau ua kom meej yeej ib txwm siv txoj kev hloov hmoov Zinc . Txij li xyoo 1960, "txoj kev carbon - hauv - pulp" ntawm kev ntxiv cov pa roj carbon activated rau hauv cov kua tau tsim sai heev. Nrog rau kev tshawb fawb txog kev siv cov ion exchangers, txoj kev siv cov ion - pauv resins los nqus kub los ntawm cov kua cyanide lossis cyanide pulp kuj muaj txiaj ntsig zoo. Qee qhov kev tshawb fawb kuj tau ua tiav ntawm kev rho tawm cov kuab tshuaj ntawm kub los ntawm cov kua cyanide. Thaum ntxiv sulfuric acid rau hauv cov kua kub uas muaj cyanide, isoamyl cawv tuaj yeem siv los rho tawm kub, thiab tus nqi rho tawm nce nrog rau kev nce ntawm sulfuric acid concentration. Piv txwv li, thaum rho tawm hauv 2mol / L sulfuric acid kua, kub kuj tuaj yeem cais tawm ntawm cov khoom tsis huv xws li arsenic thiab hlau. Siv oxyalkoxy phosphate los rho tawm kub los ntawm cov tshuaj cyanate alkaline tau ua tiav cov cim qhia txog kev rho tawm zoo, thiab siv sodium sulfite rau kev rho tawm rov qab kuj tau txais cov txiaj ntsig zoo, thiab lwm yam.

Hauv kev xaus, cov txheej txheem cyanidation kub extraction muaj keeb kwm ntev thiab kev txhim kho txuas ntxiv. Cov txheej txheem sib txawv thiab cov tshuaj reagents muaj lawv tus kheej cov yam ntxwv thiab daim ntawv thov scenarios, thiab kev lag luam niaj hnub tshawb nrhiav thiab tsim kho tshiab los txhim kho kev ua haujlwm thiab kev lag luam ntawm kev rho tawm kub thaum ua kom muaj kev tiv thaiv ib puag ncig thiab kev nyab xeeb.