Cyanidation Gold Extraction Process le Zinc Powder Replacement

Ba setso Ts'ebetso ea ho ntša khauta ea cyanidation haholo-holo e na le mekhoa e meraro e meholo: leaching, ho hlatsoa, ​​le ho fetola (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 leaching, ho sebelisoa mefuta e 'meli ea mantlha ea li-reagents: Li-cyanides le li-alkali tse sireletsang.

(1) Cyanides

Ka indasteri, the li-cyanides e sebelisoang hangata bakeng sa cyanidation leaching ea khauta e 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 ea khoebo Sodium cyanide hangata e hatelloa ka hare ho lidikadikoe kapa diboloko.

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 seboping 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, tse kang soluble sulfides, carbon, le litšila tse ling tse sa tsitsang. Molemo oa eona ke theko ea eona e tlaase, empa tekanyo e kholo, hoo e ka bang 2 - 2.5 linako tse ling tsa sodium cyanide. Ho felisa tšusumetso ea litšila tse kotsi, kalafo ea pele e lokela ho etsoa ha u sebelisa cyanide melt. Mekhoa ea phekolo e kenyelletsa ho ferekana ho matla ka moea kapa ho eketsa tekanyo e loketseng ea letsoai la loto 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 fokotsa khauta ho tsoa ho khauta - e nang le tharollo, kahoo ho fumana khauta. Ho tloha lekholong la bo20 la lilemo, ho tsosolosoa ha khauta ho tloha ho cyanide pulp ho qala ka ho hlatsoa makhasi, ebe ho hlakisoa le ho ntša metsi a moimana. The precipitation ea khauta e tsoang ho tharollo ea moimana e hlalositsoeng e 'nile ea sebelisoa kamehla Phetoho ea phofo ea Zinc mokhoa. Ho tloha lilemong tsa bo-1960, "mokhoa oa carbon - in - pulp" oa ho eketsa carbon activated ho pulp o tsoetse pele ka potlako. Ka lipatlisiso mabapi le ts'ebeliso ea li-exchangers tsa ion, mokhoa oa ho sebelisa li-resin tsa ion ho hlahisa khauta ho tsoa ho tharollo ea cyanide kapa pulp ea cyanide le ona o na le boleng ba bohlokoa bo sebetsang. Ho boetse ho entsoe lipatlisiso tse mabapi le ho ntšoa ha mokelikeli oa khauta mokelikeli oa cyanide. Ha sulfuric acid e eketsoa ho khauta ea cyanide - e nang le tharollo, joala ea isoamyl e ka sebelisoa ho ntša khauta, 'me sekhahla sa ho ntša se eketseha ka keketseho ea sulfuric acid concentration. Ka mohlala, ha u ntša motsoako oa 2mol / L sulfuric acid, khauta e ka boela ea aroloa ho litšila tse kang arsenic le tšepe. Ho sebelisa oxyalkoxy phosphate ho ntša khauta ho litharollo tsa alkaline ea cyanate ho fihletse matšoao a khotsofatsang a ho ntša, 'me ho sebelisa sodium sulfite bakeng sa morao - ho ntšoa ho boetse ho fumane liphello tse ntle, joalo-joalo.

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.