Lub luag haujlwm ntawm Calcium Oxide hauv Kub Extraction nrog Sodium Cyanide

Introduction

Kub cyanidation, tseem hu ua cyanide leaching, yog txheej txheem dav siv rau rho tawm kub los ntawm cov ore raw. Hauv cov txheej txheem no, Sodium cyanide yog ua hauj lwm los yaj kub nyob rau hauv lub pob zeb, raws li kub nws tus kheej tsis soluble nyob rau hauv cyanide. Txawm li cas los xij, muaj ntau yam impurities thiab tshuaj ib puag ncig ntawm cov ore tuaj yeem cuam tshuam rau kev ua tau zoo thiab tus nqi ntawm cov txheej txheem rho tawm. Qhov no yog qhov twg Cov tshuaj calcium oxide ua lub luag haujlwm tseem ceeb.

Kho tus nqi pH ntawm lub pulp

Ib qho ntawm cov haujlwm tseem ceeb ntawm calcium oxide hauv kub cyanidation yog tswj cov pH ntawm cov ore pulp. Thaum calcium oxide ntxiv rau hauv dej, nws hnov ​​​​mob kom nce cov concentration ntawm hydroxide ions hauv cov tshuaj, yog li nce tus nqi pH.

Nyob rau hauv cov txheej txheem cyanidation, nws yog ib qho tseem ceeb kom muaj pH siab, feem ntau saum 11. Qhov no yog vim Sodium Cyanide hydrolyzes nyob rau hauv ib tug aqueous tov. Qhov degree ntawm hydrolysis no muaj feem xyuam nrog tus nqi pH ntawm cov tshuaj. Ntawm pH siab, qhov sib npaug ntawm cov tshuaj tiv thaiv hydrolysis hloov los txo cov concentration ntawm hydrogen cyanide hauv cov tshuaj. Txij li thaum hydrogen cyanide yog volatile thiab tuaj yeem khiav tawm ntawm lub cev, kev tswj hwm pH siab pab tiv thaiv kev poob ntawm cyanide hauv daim ntawv ntawm hydrogen cyanide gas. Qhov no yog qhov tseem ceeb heev vim tias qhov tseem ceeb ntawm cov leaching kub yog cov cyanide ion, thiab txhua qhov poob ntawm cyanide yuav ua rau muaj kev noj ntau ntxiv. sodium cyanide thiab txo efficiency ntawm Kub rho tawm.

Inhibiting Hydrolysis ntawm Cyanide

Raws li tau hais los saum toj no, hydrolysis ntawm sodium cyanide tuaj yeem ua rau tsim cov hydrogen cyanide, uas tsis yog tsuas yog poob ntawm qhov muaj txiaj ntsig cyanide reagent tab sis kuj ua rau muaj kev pheej hmoo ntawm ib puag ncig thiab kev nyab xeeb vim nws toxicity. Calcium oxide pab inhibit qhov tshuaj tiv thaiv hydrolysis. Los ntawm kev nce pH ntawm cov tshuaj, nws txo cov concentration ntawm hydrogen ions muaj rau cov tshuaj tiv thaiv nrog cyanide ions los ua hydrogen cyanide. Qhov no ua kom ntseeg tau tias ntau dua ntawm cov cyanide tseem nyob rau hauv daim ntawv ntawm cyanide ions, uas yog qhov tseem ceeb rau kev tawg ntawm kub.

Tshem tawm cov teebmeem tsis zoo ntawm qee cov ions

Ore feem ntau muaj ntau yam impurities xws li tooj liab thiab hlau ions, uas tuaj yeem cuam tshuam tsis zoo rau cov txheej txheem kub cyanidation. Piv txwv li, tooj liab ions tuaj yeem hnov ​​​​mob nrog cyanide los tsim cov tebchaw nyuaj, yog li siv cyanide thiab txo nws qhov muaj rau kev sib cais kub. Hlau ions, tshwj xeeb tshaj yog ferric ions, kuj tuaj yeem cuam tshuam nrog cyanide, tsim ferricyanide complexes.

Calcium oxide tuaj yeem pab txo cov teebmeem no. Hauv ib puag ncig alkaline tsim los ntawm calcium oxide, qee qhov ntawm cov hlau ions tuaj yeem tsim cov dej nag. Piv txwv li, ferric ions tuaj yeem cuam tshuam nrog hydroxide ions los ua ferric hydroxide precipitate. Cov nag lossis daus no txo ​​cov concentration ntawm cov hlau ions hauv cov tshuaj, tiv thaiv lawv los ntawm kev haus cyanide thiab cuam tshuam nrog cov txheej txheem kub leaching.

Tej yam tshwm sim tsis zoo ntawm pH siab

Thaum calcium oxide muaj txiaj ntsig zoo rau ntau yam ntawm cov txheej txheem cyanidation, yog tias tus nqi pH siab dhau (feem ntau siab dua 12), nws tuaj yeem cuam tshuam tsis zoo rau kev rho tawm kub. Thaum pH siab heev, calcium oxide tuaj yeem ua rau cov txheej txheem ntawm calcium peroxide nyob rau saum npoo ntawm cov khoom kub. Cov txheej no ua raws li kev thaiv, tiv thaiv kev sib cuag ncaj qha ntawm cov cyanide ions thiab cov kub saum npoo, yog li cuam tshuam rau kev tawg ntawm kub. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum ua tib zoo tswj cov nyiaj calcium oxide ntxiv kom paub meej tias cov pH raug tswj hwm ntawm qib zoo rau kev rho tawm kub.

xaus

Hauv cov ntsiab lus, calcium oxide plays ntau lub luag haujlwm tseem ceeb hauv cov txheej txheem rho tawm kub siv sodium cyanide. Nws kho cov pH ntawm cov ore pulp, inhibits hydrolysis ntawm cyanide, thiab pab tshem tawm cov teebmeem ntawm qee cov hlau ions. Txawm li cas los xij, kev tswj kom zoo ntawm pH yog qhov tseem ceeb kom tsis txhob muaj kev cuam tshuam tsis zoo rau kev rho tawm kub. Kev nkag siab txog cov haujlwm ntawm calcium oxide tuaj yeem pab txhim kho cov txheej txheem cyanidation, txhim kho cov txiaj ntsig ntawm kev rho tawm kub, thiab txo qis kev noj cov sodium cyanide, uas tsis yog kev lag luam zoo xwb tab sis kuj yog ib puag ncig zoo los ntawm kev txo qis kev tso tawm ntawm cov tshuaj lom cyanide.