Cov txheej txheem cyanidation yog lub hauv paus tseem ceeb hauv kev rho tawm kub los ntawm nws cov ores. Kev nkag siab txog kev siv sodium cyanide thaum lub sijhawm no yog qhov tseem ceeb rau kev ua haujlwm kom zoo dua thiab txo qhov cuam tshuam rau ib puag ncig. Tsab xov xwm no delves rau hauv ntau yam mechanisms uas ua rau muaj kev siv Sodium Cyanide hauv cov txheej txheem kub cyanidation.
1. Autodecomposition
Sodium cyanide dhau los ua autodecomposition thaum lub sijhawm cyanidation. Qhov no ua rau muaj carbonic acid, formic acid, thiab ammonia. Cov tshuaj tiv thaiv autodecomposition tuaj yeem nyuaj thiab cuam tshuam los ntawm cov yam xws li kub, concentration, thiab qhov muaj qee yam catalysts.
2. Hydrolysis
Hydrolysis ntawm Sodium cyanide yog lwm txoj hauv kev tseem ceeb ntawm kev noj. Cov tshuaj tiv thaiv ntawm dej thiab sodium cyanide yog raws li nram no:
( H2O + NaCN HCN + NaOH )
Hydrogen cyanide (HCN), ib qho tshuaj lom thiab muaj kuab lom heev, raug tsim tawm thaum lub sijhawm hydrolysis no. Qhov ntau ntawm HCN tsim tawm muaj feem cuam tshuam nrog alkalinity ntawm cov tshuaj. Thaum tus nqi pH raug tswj hwm ntawm 12 lossis siab dua, cov tshuaj cyanide tseem ruaj khov. Txawm li cas los xij, cov tshuaj uas tuaj yeem txo tus nqi pH, xws li carbon dioxide los ntawm huab cua, cov kua qaub hauv dej pleev, divalent magnesium ions ( Mg2 + ) thiab trivalent txhuas ions ( A13 + ), thiab ntau yam minerals hauv cov ore lossis cov khoom oxidation ntawm cov minerals sulfide , tuaj yeem ua kom cov tshuaj hydrolysis sai dua.
3. Kev tsim ntawm Thiocyanate
Sodium cyanide ua rau cov tshuaj sulfide xws li hlau, tooj liab, thiab arsenic ua rau cov thiocyanate complexes. Cov tshuaj no hloov cov cyanide ions mus ua cov tshuaj uas tsis tshua muaj zog, ua rau cov cyanide dawb uas muaj rau kev rho kub tsawg dua . Kev tsim cov thiocyanate complexes no tsis yog tsuas yog ua rau kev siv cyanide ntau ntxiv xwb tab sis kuj cuam tshuam rau kev ua haujlwm ntawm cov txheej txheem cyanidation kub.
Nkag siab txog cov txheej txheem kev noj haus no muab kev pom zoo rau cov neeg ua haujlwm hauv kev lag luam kub mining. Los ntawm kev ua tib zoo saib xyuas thiab tswj cov xwm txheej ntawm cov txheej txheem cyanidation, nws muaj peev xwm txo qis kev siv cyanide, txhim kho cov nyiaj rov qab los, thiab txo qis ib puag ncig hneev taw ntawm kev ua haujlwm kub mining.
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