Kafukufuku pa Pretreatment Technologies of Gold Amayang'ana kwambiri Cyanide Leaching

Kuchotsa golide pogwiritsa ntchito cyanide ndi njira yakale yochotsera golide. Komabe, chifukwa cha zovuta za miyalayi, nthawi zambiri kumafunika kukonza bwino ntchito yochotsa golide. Nkhaniyi ikufotokoza mwatsatanetsatane njira zamakono zochotsera golide pogwiritsa ntchito cyanide Leaching , cholinga chake ndi kupereka malangizo ogwiritsira ntchito popanga golide.

I. Physical Pretreatment Technologies

1. Kupera Kwabwino

Kuyika kwa golideyo kumatsitsidwa mpaka 325 mesh kapena kupitilira apo kudzera mu zida monga mphero za mpira kuti asiyanitse bwino mchere wa golide ku gangue. Mchitidwe wa mgodi wina wa golidi umasonyeza kuti kugaya bwino kumatha kuonjezera malo owonetsera golidi ndi 40%, ndipo mlingo wa leaching ukhoza kuwonjezeka ndi 8-12%.

2. Kuwunika ndi Kuchotsa Chidetso

Zipangizo monga zotchingira zozungulira zimagwiritsidwa ntchito kuchotsa zinyalala monga matabwa ndi zidutswa za pulasitiki. Chitsanzo chogwiritsidwa ntchito mu concentrator inayake chikuwonetsa kuti pambuyo poyezera, kuchuluka kwa kutsekeka kwa zida kumachepa ndi 70%, ndipo kutayika kwa cyanide kumachepa ndi 5%.

3. Flotation Reagent Kuchotsa

Pa flotation concentrates, njira ya magawo awiri ya "regrinding - reagent removal" imagwiritsidwa ntchito kuti ichotse bwino flotation reagents monga xanthate ndi mafuta a nambala 2. Deta ya mafakitale ikuwonetsa kuti pambuyo pochotsa reagent, kumwa Sodium Cyanide kumachepetsedwa ndi 35%, ndipo kuchuluka kwa adsorption ya activated Carbon kumawonjezeka ndi 15%.

II. Chemical Pretreatment Technologies

1. Alkaline Pretreatment

Laimu amawonjezeredwa kuti asinthe pH kukhala 10-11. kotero kuti zinthu zovulaza monga zinki, arsenic, ndi antimoni zimapanga mchere wosungunuka. Pambuyo pogwiritsira ntchito mgodi wina wa golidi wokhala ndi arsenic, kumwa kwa cyanide kumachepetsedwa kuchoka pa 12 kg / t kufika pa 6.5 kg / t, ndipo kuchuluka kwa leaching kumawonjezeka ndi 9%.

2. Oxidation Pretreatment

• Air Oxidation

Pogwiritsa ntchito mpweya ndi kusonkhezera kuti zinthu zochepetsera zikhale ndi okosijeni, mumgodi wina wagolide wamtundu wa pyrrhotite, mutatha kuchiritsidwa, mphamvu zamkati zimawonjezeka kuchokera -150 mV mpaka +200 mV, ndipo nthawi ya cyanidation imafupikitsidwa ndi 40%.

• Kuwonjezera Ma Oxidants

Ngati mlingo wa lead nitrate uli 0.5 kg/t, kuchuluka kwa ma sulfide ions kumatha kuchepetsedwa ndi 60%, ndipo kuchuluka kwa leaching kumawonjezeka ndi 7%. Mu mkuwa wina wagolide, kugwiritsa ntchito sodium cyanide kumachepetsedwa ndi 40% mutalandira chithandizo choyambirira ndi hydrogen peroxide.

3. Synergistic Leaching ndi Ammonia-Cyanide

Madzi a ammonia (omwe ali ndi 1-3%) amawonjezeredwa ku golide wokhala ndi mkuwa kuti apange ammonia okhazikika amkuwa. Mayeso a mafakitale akuwonetsa kuti kuchuluka kwa leaching yamkuwa kumatha kuwongoleredwa pansi pa 5%, ndipo kutsika kwa golide kumawonjezeka ndi 12%.

III. Biological Pretreatment Technologies

Tizilombo tating'onoting'ono monga Thiobacillus ferrooxidans amagwiritsidwa ntchito kuwononga mchere wa sulfide. Pambuyo pa masiku 20 a oxidation yachilengedwe mumgodi wina wagolide, kuchuluka kwa kuwonongeka kwa pyrite kumafika 92%, ndipo kutsika kwa golide kumawonjezeka kuchoka pa 35% mpaka 88%. Tekinoloje iyi ili ndi mwayi wokonda zachilengedwe, koma nthawi ya chithandizo ndi yayitali (masiku 15-30).

IV. Malingaliro Osankha Njira

Kachitidwe ka pretreatment iyenera kusankhidwa mozama molingana ndi mtundu wa ore:

• Kwa miyala yokhala ndi sulfure wambiri komanso arsenic wochuluka, makutidwe ndi okosijeni achilengedwe kapena kuwotcha kumayenera kutsatiridwa.

• Kwa golide wokhala ndi mkuwa, dongosolo la ammonia-cyanide likulimbikitsidwa.

• Pakuti flotation likunena, reagent kuchotsa mankhwala ayenera kulimbikitsidwa.

• Kwa ore wamba, njira yophatikizira ya leaching ya alkaline ndi oxidant yowonjezera ingatengedwe.

Kutsiliza:

Kugwiritsa ntchito mwanzeru matekinoloje opangira mankhwala kumatha kusintha kwambiri cyanide leaching effect. M'tsogolomu, m'pofunika kupititsa patsogolo maphunziro abwino komanso otsika omwe amagwiritsira ntchito mankhwala opangira mankhwala kuti apititse patsogolo chitukuko chobiriwira cha matekinoloje ochotsa golide.