Cyanidation Gold Extraction Process uye Zinc Powder Replacement

Maitiro echinyakare ekubvisa goridhe reCyanidation anosanganisira nzira nhatu huru: kubvisa tsvina, kuisuka, uye kuitsiva (mvura inonaya).

1. Leaching

Leaching inzira iyo goridhe rakasimba muore inonyungudika muokisijeni - ine cyanide solution. Parizvino, maererano nemaitiro, midziyo, manejimendi, uye mashandiro, maitiro aya ave kuwedzera kuoma. Sezvambotaurwa, kunyungudutswa kwegoridhe muokisijeni - ine cyanide mhinduro ndeye electrochemical corrosion process.

Munguva yekubviswa kwemvura, mhando mbiri huru dzema reagents dzinoshandiswa: Cyanides uye protective alkalis.

(1) Cyanides

Muindasitiri, macyanides anoshandiswa zvakanyanya pakuburitsa goridhe kubva mucyanidation anosanganisira potassium cyanide (KCN), Sodium cyanide (NaCN), calcium cyanide [Ca(CN)₂], uye ammonium cyanide (NH₄CN).

Sodium cyanide ndiyo cyanide inonyanya kushandiswa mukugadzirwa. Ihupfu huchena hune chepfu yakawanda, uye Sodium Cyanide yekutengeserana inowanzo manikidzwa kuita mabhora kana mabhuroko.

Mumaindasitiri, cyanide melt inoshandiswawo se leaching reagent. Musanganiswa unoumbwa nekunyungudutsa musanganiswa we calcium cyanide, munyu, uye coke muchoto chemagetsi. Kunze kwekuva ne 40% - 45% yeCa(CN)₂ neNaCN, inewo zvimwe zvinhu zvisina kuchena zvinokuvadza maitiro e cyanidation, zvakaita se soluble sulfides, carbon, nezvimwe zvinhu zvisina kuchena. Zvakanakira mutengo wayo wakaderera, asi chiyero chayo chakakura, kanenge kaviri - kaviri nehafu pane sodium cyanide . Kuti ubvise simba retsvina ine njodzi, kurapwa kunofanirwa kuitwa usati washandisa cyanide melt. Nzira dzekurapa dzinosanganisira kumutswa kwakasimba nemhepo kana kuwedzera huwandu hwakakodzera hwemunyu we lead mumushonga.

Nechepfungwa, chete 0.5g yesodium cyanide inodiwa kunyungudutsa 1g yeAu. Nekudaro, mukugadzirwa chaiko, kudyiwa kwecyanide kuri 20 - 200 times theoretical amount, kana kutopfuura. Kuwanda kwekushandisa kunonyanya kuenderana nezviri mune zvimwe zvikamu mu ore zvinogona kuita ne cyanide.

2. Kugeza

Washing inzira yekushandisa mvura kugeza pamusoro pezvimedu zveore uye goridhe rakanyungudutswa pakati pezvimedu kuti uwane kusimba - kuparadzaniswa kwemvura kuitira kudzoreredza goridhe - rine mhinduro mushure mekudonha.

3. Kutsiva

Kutsiva inzira yekushandisa zinc powder kuderedza uye kupinza goridhe kubva mumushonga une goridhe, nokudaro goridhe richidzoka. Kubva muzana remakore rechi20, kudzorerwa kwegoridhe kubva mu cyanide pulp kunosanganisira kutanga kushambidza pulp, wozobvisa utsi mu solution ine mimba. Kudonhedza goridhe kubva mumushonga une mimba wakajeka kwagara kuchishandisa nzira yekutsiva Zinc powder . Kubva kuma1960, "carbon - in - pulp method" yekuwedzera activated carbon ku pulp yakawedzera nekukurumidza. Nekutsvaga kwekushandiswa kwemaion exchangers, nzira yekushandisa ion - exchange resins kunyudza goridhe kubva mu cyanide solutions kana cyanide pulp ine kukosha kwakakosha. Kumwe kutsvagisa kwakaitwawo pakubviswa kwegoridhe kubva mu cyanide solutions. Kana sulfuric acid yawedzerwa mumushonga une cyanide gold, isoamyl alcohol inogona kushandiswa kuburitsa goridhe, uye mwero wekuburitsa unowedzera nekuwedzera kwehuwandu hwe sulfuric acid. Semuenzaniso, kana uchiburitsa mu 2mol/L sulfuric acid solution, goridhe rinogonawo kuparadzaniswa nekusvibiswa kwakadai se arsenic ne iron. Kushandisa oxalkoxy phosphate kubvisa goridhe kubva mu cyanate alkaline solutions kwakawana zviratidzo zvinogutsa zvekubvisa goridhe, uye kushandisa sodium sulfite kubvisa goridhe kubva kumashure kwakawanawo mhedzisiro yakanaka, nezvimwewo.

Mukupedzisa, iyo cyanidation yegoridhe yekubvisa maitiro ine nhoroondo refu-yakamira uye inoenderera mberi nekusimudzira. Nzira dzakasiyana uye reagents dzine hunhu hwavo uye mamiriro ekushandisa, uye iyo indasitiri inogara ichiongorora nekuvandudza kuvandudza mashandiro uye hupfumi hwekuchera goridhe uku uchivimbisa kuchengetedza kwezvakatipoteredza uye kuchengetedzwa.