Barrick escalates kev tsis sib haum xeeb nrog PNG tshaj Porgera kuv

Canada's Barrick Gold (TSX: ABX) (NYSE: GOLD) tau  txais tsab ntawv ceeb toom tsis sib haum xeeb rau tsoomfwv Papua New Guinea  (PNG) dhau lub teb chaws tsis kam rov ua daim ntawv tso cai rau Porgera mine.

Cov neeg tsim khoom kub thib ob hauv ntiaj teb tau sib cav tias PNG qhov  kev txiav txim siab tsis lees txais daim ntawv thov  kev cog lus txuas ntxiv tau ua txhaum ob tog kev cog lus ntawm lub tebchaws thiab Australia, nrog rau txoj cai lij choj thoob ntiaj teb tswj hwm kev nqis peev txawv teb chaws.

Yog tias ob tog tsis tuaj yeem daws qhov kev tsis sib haum xeeb los ntawm kev sib tham, Barrick npaj yuav coj PNG mus rau kev txiav txim siab thoob ntiaj teb.

"Nws yog qhov npau taws heev uas Barrick tab tom nrhiav kev txiav txim siab thoob ntiaj teb los ntawm nws cov koom tes ua ntej PNG lub tsev hais plaub tau txiav txim rau qhov teeb meem," Catherine Coumans, ntawm MiningWatch Canada, tau hais hauv nqe lus. 

"Lub mine yog ib qho piv txwv phem tshaj plaws ntawm kev tsis muaj lub luag haujlwm kuv paub txog," nws hais ntxiv.

Barrick thiab nws tus khub Suav, Zijin Mining,  tau tso tseg ib ntus kev ua haujlwm  ntawm lub mine hauv Enga Xeev thaum lub Plaub Hlis. Qhov kev txav mus los ua raws li Thawj Kav Tebchaws James Marape qhov tsis kam rov ua dua Porgera daim ntawv tso cai raws li  kev txhawj xeeb ntawm ib puag ncig thiab kev sib raug zoo.

Tus neeg ua haujlwm miner hauv Toronto tau sau tseg tias qhov kev tsis lees paub no tau tshaj tawm rau pej xeem yam tsis tau ceeb toom rau tus thawj tswj hwm kuv, Barrick Niugini Limited, lossis ua raws li cov txheej txheem tiav.

Thaum lub Tsib Hlis, cov kub loj tau muab 15% feem pua ​​​​ntawm cov khoom lag luam hauv Porgera mine rau cov tswv av hauv zos, hauv kev sim tshiab los rhuav tshem kev tsis txaus siab nrog tsoomfwv tshaj li kuv lub neej yav tom ntej.

PNG tom qab ntawd tau hem Barrick nrog kev ua txhaum cai, thov tias lub tuam txhab kev sib koom ua lag luam hauv lub tebchaws tau npaj ua txhaum cai xa tawm $ 13 lab hauv kub thiab nyiaj rau Australia. BNL tsis lees paub qhov kev iab liam.

Qhov kev tsis sib haum xeeb tsis tu ncua tau ua rau Barrick qhov kev sib kis tsis zoo - cuam tshuam nws cov txiaj ntsig xav tau rau lub xyoo. Tam  sim no nws cia siab tias yuav tsim tau ntawm 4.6 lab thiab 5 lab ooj kub  xyoo no - 200,000 ounces qis dua nws qhov kev kwv yees yav dhau los.

Barrick tau tshaj tawm thaum lub sijhawm uas PNG tseem tab tom thov lub tuam txhab thiab Zijin  them $ 191 lab hauv cov se rov qab , tshwm sim los ntawm kev tshawb xyuas se ua ntawm 2006 thiab 2015.

Tier ib lub peev xwm

Barrick tus thawj tswj hwm thiab tus thawj coj ua haujlwm, Mark Bristow, tau hais rau lub Peb Hlis tias  Porgera muaj "tier ib lub peev xwm"  tab sis tau ntsib ntau yam kev sib tw hauv daim ntawv ntawm "cov teeb meem qub txeeg qub teg thiab ib cheeb tsam tsis zoo."

Lub mine kub, nyob rau hauv PNG cheeb tsam sab qaum teb highlands, yog kev sib koom ua lag luam ntawm Barrick thiab Zijin Mining. Txhua tus muaj 47.5% ntawm cov mine, nrog rau qhov seem 5% tuav los ntawm pawg tswv av Mineral Resources Enga.

Porgera pab txhawb txog li 10% ntawm lub teb chaws cov khoom xa tawm thiab ntiav tshaj 3,300 Papua New Guinea haiv neeg.

Lub qhov qhib thiab hauv av kub mine zaum ntawm qhov siab ntawm 2,200-2,600 meters hauv Enga xeev, thiab yog li 600 km (370 mais) qaum teb hnub poob ntawm Port Moresby.

Lwm lub tuam txhab mining ua haujlwm hauv PNG, suav nrog Australia's Newcrest (ASX: NCM), tsis tau cuam tshuam los ntawm kev txiav txim siab txog Porgera. Cov miner tau "zoo siab" tus Thawj Kav Tebchaws txoj kev txhawb nqa rau nws  Wafi Golpu kub thiab tooj liab khoom , ntxiv tias nws daim ntawv cog lus tshwj xeeb ntawm Lihir cov haujlwm tseem nyob hauv qhov zoo nrog kev rov ua dua tshiab tsis xav tau txog 2035.

Cov yam ntxwv thiab cov qauv ntawm Chromium Alloy Steel Mill liners

High chromium alloy cam khwb cia hlau feem ntau yog hais txog alloy dawb cam khwb cia hlau nrog cov ntsiab lus chromium ntawm 12% - 30% thiab cov ntsiab lus carbon ntawm 2.4% - 3.6%. Nws yog tus cwj pwm los ntawm microhardness hv1300 ~ 1800 ntawm M7C3 eutectic carbide, uas yog dispersed ntawm lub matrix ntawm martensite (cov qauv nyuaj tshaj plaws nyob rau hauv cov hlau matrix) nyob rau hauv daim ntawv ntawm ib tug tawg network thiab cais cov duab, uas txo lub splitting nyhuv ntawm lub matrix. . Yog li ntawd, lub siab chromium alloy liner muaj lub zog siab, toughness, thiab siab hnav tsis kam, thiab nws qhov kev ua tau zoo sawv cev rau qib siab tshaj plaws ntawm cov khoom siv hlau hnav. Nws tau dav siv nyob rau hauv loj-scale cement pob mills txawv teb chaws. Lub neej ua haujlwm ntawm thawj lub hauv paus yog 6-8 xyoo, thiab qhov thib ob thiab thib peb hauv yog ntau tshaj 12 xyoo.

Hauv daim ntawv thov, cov pa roj carbon tsawg tsawg chromium cam khwb cia hlau (steel) hauv ob sab phlu feem ntau yog siv rau kev ua haujlwm nrog kev cuam tshuam loj, thiab cov pa roj carbon siab thiab siab chromium cam khwb cia hlau hauv ob sab phlu yog siv rau kev ua haujlwm nrog kev cuam tshuam me me, thiaj li. muab kev ua si tag nrho rau qhov hnav tsis kam ntawm cov khoom siv. Piv txwv li, Cr15 liner nrog 2.4% ~ 2.65% C tuaj yeem siv rau mills hauv qab 4.2m (ib lub thawv); Cr20 thiab Cr26 liners nrog 2.65% ~ 2.85% C tuaj yeem siv rau cov mills siab tshaj 4.2m; Thaum muaj cov txheej txheem ua ntej pulverizing ua ntej sib tsoo, xws li "cov menyuam xovxwm + cement zeb", qhov nruab nrab lub pob taub yog tsawg dua 60 hli, thiab cov ntsiab lus C tuaj yeem siab dua, uas tuaj yeem lav qhov kev pabcuam lub neej (ib lub thawv) ntawm 8-10. xyoo, thiab kev pab cuam lub neej ntawm bin 2 thiab 3 yog ntev dua. Kev sib tsoo lub taub hau phaj tuaj yeem ua los ntawm nruab nrab (tsawg) carbon siab chromium cam khwb cia hlau; cov pa tawm grate phaj tuaj yeem ua los ntawm nruab nrab thiab siab carbon siab chromium cam khwb cia hlau; cov pawg thawj coj saib ua ke ntawm cov blocks tuaj yeem ua los ntawm cov pa roj carbon tsawg chromium cam khwb cia hlau.

Kev siv tswv yim

Cov chromium alloy steel mill liners tsim los ntawm Qiming Machinery suav nrog Cr13, Cr15, Cr20, thiab Cr26, uas yog siv rau ntau tshaj 200 pawg ntawm cov pob zeb nrog cov qauv sib txawv thiab cov qauv ntawm ø1.83M, ø2.2M, ø3M, ø3.5m 3.8m, ø4.2m, ø5M, thiab ø5.4m. Piv txwv li, Cr15 zeb liner tau siv nyob rau hauv thawj qhov chaw ntawm ø2.2m × 6.5m zeb hauv Yanshi cement rau 13 xyoo; Lub Cr15 zeb liner tau siv rau hauv thawj qhov chaw ntawm ø 3m × 9m zeb hauv Shunbao Cement rau 7 xyoo; Thaum lub Tsib Hlis 2020, Cr26 zeb liners thiab sib tsoo lub taub hau phaj siv rau ntawm ø5.4m × 15.5m super loj zeb ntawm Dayu cement (Shandong) Co., Ltd. tau ua haujlwm tsis tu ncua rau ntau tshaj 6 xyoo. Raws li tus neeg siv khoom daim ntawv tshaj tawm, lub neej kev pab cuam ntawm kev sib tsoo lub taub hau phaj tau tshaj 2 npaug ntawm cov khoom sib tsoo lub taub hau, thiab nws yuav tsum siv li ntawm 2 xyoos.

Chromium alloy steel zeb linerscasting ntau lawm

Txhim kho tej yam toughness ntawm siab chromium alloy steel zeb liners

Thaum xaiv cov khoom siv high chromium cam khwb cia hlau los npaj cov zeb liners, cov tuam txhab tsim khoom yuav tsum muab qhov tseem ceeb rau nws cov kev hnav tsis kam, tib lub sijhawm, nws yuav tsum tau them tshwj xeeb rau kev sib xyaw ntawm lub zog thiab tawv. Tsuas yog thaum cov organic sib piv ntawm lub zog siab, muaj zog toughness, thiab siab hnav tsis kam tuaj yeem ua tau zoo heev ntawm chromium cam khwb cia hlau kom coj mus rau hauv kev ua si tag nrho.

Txhawm rau txhim kho cov khoom ntawm siab chromium cam khwb cia hlau, qhov tawg toughness KIC tus nqi siab chromium cam khwb cia hlau yuav tsum tau nce ua ntej. Thaum CR> 13%, M7C3 eutectic carbides ntawm siab chromium cam khwb cia hlau tuaj yeem tawg thiab cais. Thaum cov eutectic carbides tseem tsis hloov thiab CR / C piv yog nruab nrab ntawm 6.6 thiab 7.1, qhov tawg toughness KIC tus nqi siab chromium cam khwb cia hlau yog qhov siab tshaj plaws, uas yog hais tias, qhov tawg propagation kuj yog qhov muaj zog tshaj. Cov txiaj ntsig tau pom tias morphology, kev faib tawm, thiab qhov loj me ntawm M7C3 eutectic carbides tuaj yeem txhim kho los ntawm kev kub kub quenching lossis ncua lub sijhawm tuav,

Ua kom toughness. Txoj kev yooj yim tshaj plaws thiab kev lag luam los hloov cov morphology, kom muaj nuj nqis, qhov loj me thiab kev faib tawm ntawm eutectic carbides nyob rau hauv siab chromium cam khwb cia hlau thiab txhim kho nws lub zog thiab tawv yog hloov cov hlau molten, tswj nws cov solidification, thiab tseem ceeb tshaj, refine eutectic carbide, txo. nws splitting nyhuv ntawm lub matrix, refine lub matrix thiab txhim kho lub toughness.

Kev nyab xeeb siv high chromium alloy steel zeb liners

• Fracture yog lub ntsiab tsis ua hauj lwm hom ntawm high chromium alloy liner. Qhov laj thawj tseem ceeb ntawm kev puas tsuaj yog casting tsis xws luag, xws li casting porosity, shrinkage kab noj hniav, porosity, inclusion, thiab lwm yam.
• High chromium alloy steel mill liners yuav tsum yog me me thiab tuab, ib lub qhov ntsia liaj qhov rooj, lossis tsis muaj lub qhov ntsia hlau. Nws tsis raug tso cai siv qhov loj thiab nyias los yog ob npaug rau lub qhov rooj hauv ob sab phlu.
• Thaum lub sij hawm installation ntawm siab chromium hauv ob sab phlu, lub hauv ob sab phlu nrog bolts qhov yuav tsum ruaj khov kho nrog bolts. Lub installation nto thiab lub tog raj kheej nto yuav tsum nyob rau hauv kev sib cuag nrog ib leeg. Nws yog qhov zoo dua los xaiv cov roj hmab cushion ua lub cushion. Nws yog nruj me ntsis txwv tsis pub rau nruab thiab siv high chromium liner yam tsis muaj txaj. Thaum lub sijhawm pib (Tsim) ua haujlwm tom qab kev teeb tsa, lub zeb yuav tsum tau ntim nrog qee yam khoom siv ua ntej ua haujlwm. Nws yog nruj me ntsis txwv tsis pub khiav lub zeb tsis muaj load.

@Nick Sun     [email protected]