Cyanidation Gold Extraction Process le Zinc Powder Replacement

Mokhoa oa setso oa ho ntša khauta oa Cyanidation o na le mekhoa e meraro e meholo: ho ntša metsi, ho hlatsoa le ho nkela sebaka (ho ntša pula).

1. Leaching

Leaching ke mokhoa oo khauta e tiileng ka har'a ore e qhibilihang ka har'a oksijene - e nang le tharollo ea cyanide. Hajoale, mabapi le ts'ebetso, lisebelisoa, tsamaiso le ts'ebetso, ts'ebetso ena e se e rarahane le ho feta. Joalokaha ho boletsoe pejana, ho qhibiliha ha khauta ka oksijene - e nang le tharollo ea cyanide ha e le hantle ke ts'ebetso ea electrochemical corrosion.

Nakong ea ts'ebetso ea ho ntša metsi, ho sebelisoa mefuta e 'meli e meholo ea li-reagent: Li-cyanide le li-alkali tse sireletsang.

(1) Cyanides

Indastering, li-cyanide tse sebelisoang haholo bakeng sa ho ntša khauta ka cyanidation li kenyelletsa potassium cyanide (KCN), Sodium cyanide (NaCN), calcium cyanide [Ca(CN)₂], le ammonium cyanide (NH₄CN).

Sodium cyanide ke cyanide e sebelisoang haholo tlhahisong. Ke phofo e tšoeu e chefo haholo, 'me Sodium Cyanide ea khoebo hangata e hatelloa ho kena libolokong kapa libolokong.

Liindastering, cyanide melt e boetse e sebelisoa e le reagent ea leaching. Ke motsoako o entsoeng ka ho qhibilihisa motsoako oa calcium cyanide, letsoai le coke ka sebōping sa motlakase. Ntle le ho ba le 40% - 45% ea Ca(CN)₂ le NaCN, e boetse e na le litšila tse ling tse kotsi ts'ebetsong ea cyanidation, joalo ka li-sulfide tse qhibilihang, khabone, le litšila tse ling tse sa qhibiliheng. Molemo oa eona ke theko ea eona e tlase, empa tekanyo e kholo, hoo e ka bang makhetlo a 2 - 2.5 ho feta a sodium cyanide . Ho felisa tšusumetso ea litšila tse kotsi, kalafo e lokela ho etsoa pele ho sebelisoa cyanide melt. Mekhoa ea kalafo e kenyelletsa ho sisinyeha ho matla ka moea kapa ho eketsa letsoai le lekaneng la load tharollong.

Ka khopolo, ke 0.5g feela ea sodium cyanide e hlokahalang ho qhala 1g ea Au. Leha ho le joalo, tlhahisong ea 'nete, tšebeliso ea cyanide ke makhetlo a 20 - 200 ho feta tekano, kapa ho feta. Palo ea tšebeliso e ipapisitse le litaba tsa likarolo tse ling tsa ore tse ka sebetsanang le cyanide.

2. Ho hlatsoa

Ho hlatsoa ke mokhoa oa ho sebelisa metsi ho hlatsoa bokaholimo ba likaroloana tsa ore le khauta e qhibilihisitsoeng pakeng tsa likaroloana tsa ore ho fihlela karohano e tiileng-e metsi e le ho fumana tharollo e nang le khauta ka mor'a ho tsoa.

3. Phetolo

Ho nkela sebaka ke mokhoa oa ho sebelisa phofo ea zinki ho fokotsa le ho betla khauta ho tsoa tharollong e nang le khauta, ka hona ho khutlisa khauta. Ho tloha lekholong la bo20 la lilemo, ho hlaphoheloa ha khauta ho tsoa pulp ea cyanide ho kenyelletsa ho hlatsoa pulp, ebe ho hlakisoa le ho ntša mosi tharollong e immeng. Ho ntšoa ha khauta ho tsoa tharollong e hlakisitsoeng ea moimana ho 'nile ha sebelisoa mokhoa oa ho nkela phofo ea Zinc sebaka . Ho tloha lilemong tsa bo-1960, "mokhoa oa carbon-in-pulp" oa ho eketsa carbon e entsoeng ka har'a pulp o ntlafetse ka potlako. Ka lipatlisiso mabapi le ts'ebeliso ea li-ion exchanger, mokhoa oa ho sebelisa li-resin tsa ion-exchange ho monya khauta ho tsoa litharollong tsa cyanide kapa pulp ea cyanide le oona o na le bohlokoa ba bohlokoa bo sebetsang. Lipatlisiso tse ling li boetse li entsoe mabapi le ho ntšoa ha khauta ho tsoa litharollong tsa cyanide. Ha sulfuric acid e eketsoa tharollong e nang le khauta ea cyanide, isoamyl alcohol e ka sebelisoa ho ntša khauta, 'me sekhahla sa ho ntša sea eketseha ka keketseho ea mahloriso a sulfuric acid. Mohlala, ha ho ntšoa tharollong ea 2mol/L ea sulfuric acid, khauta e ka boela ea aroloa ho litšila tse kang arsenic le tšepe. Ho sebelisa oxyalkoxy phosphate ho ntša khauta ho tsoa litharollong tsa alkaline tsa cyanate ho fihletse lipontšo tse khotsofatsang tsa ho ntša, 'me ho sebelisa sodium sulfite bakeng sa ho ntša ka morao le hona ho fumane litholoana tse ntle, jj.

Qetellong, ts'ebetso ea ho ntšoa ha khauta ea cyanidation e na le nalane ea nako e telele le nts'etsopele e tsoelang pele. Mekhoa e fapaneng le li-reagents li na le litšoaneleho tsa tsona le maemo a ts'ebeliso, 'me indasteri e lula e hlahloba le ho ntlafatsa ho ntlafatsa katleho le moruo oa ho ntšoa ha khauta ha e ntse e netefatsa tšireletso ea tikoloho le polokeho.