Kudzidza paCyanide Leaching yeCarbonaceous Carlin-Type Gold Ore

ziviso

Matombo egoridhe erudzi rweCarbonaceous Carlin anozivikanwa nekupararira kwawo uye matura makuru. Zvisinei, anokonzera matambudziko makuru mukuburitswa kwegoridhe. Matombo aya anowanzova neCarbon mukugadzirwa kwawo, uye zvidimbu zvegoridhe zviripo muchimiro chakanaka chakapararira. Kuvapo kwearsenic nekabhoni kunotungamira kumatambudziko maviri makuru: kuvharwa kwegoridhe uye mhedzisiro yekuba goridhe kwekabhoni, zvichikonzera mwero wakaderera wecyanidation leaching. Nekuda kweizvozvo, anoonekwa sematombo maviri anoramba kusimba kana matombo akaomarara, anomiririra kuzivikanwa pasi rose mumunda wekuchera goridhe.

Dambudziko reCyanide Leaching muCarbonaceous Carlin-Type Gold Ores

Gold Encapsulation

Zvicherwa zve sulfide zviri mumatombo egoridhe eCarlin anowanzo fukidza zvidimbu zvegoridhe. Chidziviriro ichi chinodzivirira kusangana kwakananga pakati pe cyanide solution negoridhe, zvichideredza zvakanyanya kushanda kwekubvisa tsvina. Semuenzaniso, mumigodhi yakawanda ine matombo akadaro, chikamu chikuru chegoridhe chinoramba chakavharirwa mukati me sulfide matrix, iyo isingasvikwe neCyanide leaching agent.

Carbon's Goridhe-Kupamba Mhedzisiro

Zvinhu zvecarbonaceous zviri mumatombo aya zvine simba guru rekugadzira cyanide complexes. Munguva yekubviswa kwecyanide, goridhe parinonyungudika roita cyanide complexes, zvinhu zvecarbonaceous zvinogona kutora complexes idzi, zvichiita kuti "goridhe ribviswe" kubva mumushonga. Izvi hazvingogumiri pakuderedza kudzoserwa kwegoridhe asi zvinokonzerawo kurasikirwa kukuru mukubviswa kwaro. Tsvagiridzo yakaratidza kuti mhando dzakasiyana dzecarbon mumatombo, dzakadai se elemental carbon, organic carbon, uye inorganic carbon, dzese dzinobatsira mukuita uku kwekuba goridhe. Elemental carbon, kunyanya, ine maitiro ekudhonza akafanana neaya eActivated Carbon , ayo anogona kutora zvakanyanya gold cyanide complexes.

Tsvagiridzo yeCyanide Leaching Experiments

Yakananga Cyanide Leaching

Ongororo dzakawanda dzakaratidza kuti yakananga cyanide leaching yecarbonaceous Carlin-mhando yegoridhe ores inoburitsa yakaderera kwazvo goridhe. Mune zvimwe zviitiko, kunyangwe kana uchishandisa advanced cyanide leaching nzira dzakadai secarbon-in-pulp (CIP) kana resin-in-pulp (RIP), mwero wekudzoreredza unoramba wakaderera. Semuyenzaniso, mune kumwe kuyedza, mwero wekudzoreredza goridhe weyakananga cyanide leaching waingove 12.9%, zvichiratidza kusashanda kweiyi nzira yezvicherwa zvinoramba zvakadaro.

Pretreatment Nzira dzeKuvandudza Cyanide Leaching

Roasting

Kugocha inzira yechinyakare yokugadzirira. Nekupisa ore, carbonaceous zvinhu zvinodzingwa seCO uye CO₂, uye pyrite inoora kuita iron oxides. Kuita uku kunofumura goridhe rakambovharwa, zvichiita kuti ive nyore kuwanikwa necyanide leaching. Nekudaro, kugocha kunoda chikafu chakanaka cheminus gumi mesh, angangoita maawa mana enguva yekuchengeta, uye kunyatso kudzora tembiricha nemhepo muchoto. Tembiricha iri pasi pe500°C kana kuti mhepo inodzikisira zvishoma inogona kuguma nekugocha kusina kukwana, zvichiita kuti kuderedzwa kwakanyanya kwekutorwa kwegoridhe. Uyezve, pa550 ° C uye pamusoro, pyrite inoshandurwa kuita refractory fomu yehematite kubva iyo goridhe haigone kuburitswa zvine cyanide. Pamusoro pezvo, kugocha kunoda kuomeswa kunodhura kwechikafu kuchoto uye kudzora kuburitsa kwakasimba pamagasi echoto. Kunyangwe ichikwanisa kuwana goridhe kutorwa kwe85 - 87% kubva kune ores ane gumi nematatu magiramu egoridhe patani, nekuda kweiyo yepamusoro mari inodiwa uye yakaoma mamiriro ekushanda, kugocha kwakasiiwa seimwe nzira yakakodzera kune akawanda carbonaceous Carlin-mhando yegoridhe ore deposits.

Kemikari Oxidation

Kemikari oxidation yakaratidza kugona kukuru mukurapa carbonaceous Carlin-mhando yegoridhe ores. Oxidizing agents mune aqueous pulps anogona kukunda zvinoparadza zvinokonzeresa zvecarbonaceous zvinhu. Semuenzaniso, kushandiswa kweklorini semushonga wekugadzirira kwakadzidzwa zvakanyanya. Nekudaro, huwandu hweklorini hunodiwa hunosiyana zvichienderana nekuramba kwechimiro chesimbi. Zvicherwa zvinyoro-refractory zvingangoda gumi kusvika makumi maviri makirogiramu eklorini patani mu cyanidation pretreatment kuti iwane 83% kana kupfuura kutorwa kwegoridhe mukuzotevera cyanidation. Akanyanya refractory ores, kune rumwe rutivi, angangoda anopfuura 100 kg eklorini patani mu pretreatment process. Mamwe maoxidizing agents akadai sehydrogen peroxide, sodium hypochlorite, uye potassium permanganate zvakare akaongororwa. Sodium hypochlorite, semuenzaniso, haingogone kusanganisa zvicherwa zve sulfide kufumura goridhe rakavharidzirwa asiwo kupfuudza zvinhu zvekabhoni, zvichideredza kubira kwavo goridhe. Tsvagiridzo yakaratidza kuti mune dzimwe nguva, kushandisa sodium hypochlorite senge pretreatment agent inogona kuvandudza zvakanyanya mwero wekudzoreredza goridhe mune inotevera cyanide leaching.

Bacterial Oxidation

Bacterial oxidation inzira iri kusimukira uye ine hushamwari nharaunda pretreatment. Musanganiswa acidophilic mabhakitiriya anogona kushandiswa oxidize sulfide zvicherwa mu ore. Izvi zvinogadzirisa zvinogadzirisa dambudziko regoridhe encapsulation ne sulfides. Munguva yebhakitiriya oxidation, mabhakitiriya anogadzirisa zvicherwa zve sulfide, achiaputsa uye achiburitsa goridhe rakavharwa. Panguva imwecheteyo, kushandiswa kweiyo activated kabhoni mune inotevera cyanide leaching process inogona kutora mukana weiyo yemakwikwi adsorption kugona kurwisa goridhe-kubira mhedzisiro yezvinhu kabhoni. Semuyenzaniso, muongororo yekabhoni Carlin-mhando yegoridhe dhipoziti muYunnan, kuburikidza nekubatanidzwa kwebhakitiriya oxidation uye kabhoni-in-pulp cyanidation, mwero wekudzoreredza goridhe wakasvika 82.39%, nepo kushandiswa kwecyanide reagent kwakaderedzwa ne49.68%. Izvi zvinoratidza kuti bhakitiriya oxidation - kabhoni cyanide leaching maitiro inzira inoshanda yekurapa carbonaceous Carlin-mhando yegoridhe ores.

mhedziso

Carbonaceous Carlin-mhando yegoridhe ores inopa matambudziko akakura mucyanide leaching process nekuda kwekuvharirwa kwegoridhe uye kabhoni-kubira goridhe maitiro. Nepo yakananga cyanide leaching isingawanzo shanda, nzira dzakasiyana dzepretreat dzakadai sekugocha, makemikari oxidation, uye bhakitiriya oxidation inopa mhinduro. Imwe neimwe nzira ine zvayakanakira uye zvinogumira maererano nekudzoreredza goridhe, mutengo, uye kukanganisa kwezvakatipoteredza. Pakati pazvo, bhakitiriya oxidation - kabhoni cyanide leaching uye dzimwe nzira dzemakemikari oxidation dzinoratidza chivimbiso chikuru chekurapa nemazvo aya marefractory ores. Zvakadaro, kumwe kutsvagurudza kuchiri kudikanwa kugadzirisa maitiro aya, kuderedza mitengo, uye kuvandudza kushamwaridzana kwavo kwezvakatipoteredza, kuitira kuti kubviswa kwegoridhe kubva mucarbonaceous Carlin-mhando yegoridhe ores ishande uye irambe iripo.