Mu ulalo wa migodi ndi mayendedwe azinthu, kuvala kwa zida nthawi zonse kwakhala kovutirapo kwambiri komwe kumalepheretsa kupanga bwino ndikuwonjezera ndalama zogwirira ntchito ndi kukonza. Ndi kugwiritsa ntchito zida zatsopano zodzitchinjiriza monga kuvala kwa alumina-zoumba zosagwira ntchito, vuto lamakampanili lathetsedwa bwino. Zaphunziridwa kuchokera ku Mine Machinery Technology Upgrade Forum yomwe yachitika posachedwapa yomwe imavala-zoumba zadothi zosagwira ntchito, zokhala ndi mikhalidwe yolimba kwambiri-zolimba kwambiri komanso zosatha kuvala bwino, zakhala "njira yabwino kwambiri" poteteza zida za migodi, kuthandiza makampani kukwaniritsa kuchepetsa mtengo, kukonza bwino komanso kusintha kobiriwira.
Malo ogwirira ntchito mgodi ndi ovuta. Zida zazikulu monga ma silo, machuti, mapaipi otumizira ndi zophwanyira n'zautali-zimakhudzidwa kwambiri-kuchulukirachulukira komanso kuzomedwa mwamphamvu kwa zinthu zolimba monga ore ndi slag. Zida zodzitchinjiriza monga zitsulo wamba ndi zomangira mphira zimatha kutha ndi kugwa-. Izi sizimangofunika kuzimitsidwa pafupipafupi kuti zisinthidwe, komanso zitha kuyambitsa ngozi zopanga chitetezo chifukwa cha kulephera kwa zida. "Kutenga mgodi lamba conveyor mzere ndi mphamvu pachaka zoyendera matani 5 miliyoni mwachitsanzo, miyambo zitsulo mbale liners ayenera kusinthidwa aliyense 3 mpaka 6 miyezi pafupifupi, mtengo wa m'malo limodzi kuposa yuan 100,000, ndi ntchito pachaka ndi kukonza ndalama kukhala mkulu." Bambo Wang, yemwe amayang'anira zida mumgodi waukulu wachitsulo, adauza atolankhani mosapita m'mbali
Mogwirizana ndi zomwe migodi imafunika kuti isawonongeke, kuvala kwa alumina-zoumba zosagwira ntchito zadothi zakhala ndi ubwino wake wapadera. Malinga ndi akatswiri amakampani, kulimba kwa mavalidwe a alumina-zoumba zosagwira ntchito zimatha kufika kupitilira HRA85, ndipo kulimba kwawo kumapitilira 5 mpaka 20 kuposa mbale zachitsulo wamba, zomwe zimatha kukulitsa moyo wautumiki wachitetezo cha zida. Panthawi imodzimodziyo, pamwamba pake imakhala yosalala kwambiri, yomwe ingachepetse kukana kunyamula katundu ndi kugwiritsa ntchito mphamvu ndi 5% mpaka 15%; kuphatikizika ndi zomangira zokongoletsedwa bwino monga mbale zomangika ndi zomangirira mbobo, zimathanso kuyika zolimba, kukana kuwononga kwambiri-kuchuluka kwa pafupipafupi, kuchepetsa kugwa{10}kutsika ndi 80%, ndipo ndi koyenera kumavalidwe apakati monga ma crusher hoppers, zigononi za chute ndi mapaipi otumizira.
Muntchito yokweza ndi kusandutsa mgodi waukulu wa malasha ku Shanxi, mgodiwo unayika zovala za alumina-zosagwira ntchito zadothi pazigawo zazikulu monga ma silo ndi machuti a mizere yake itatu yayikulu yolumikizira. Woyang'anira ntchitoyo adati pambuyo pakusintha, moyo wautumiki wachitetezo cha zida wakulitsidwa kuchokera pamiyezi itatu yoyambirira mpaka zaka 2, nthawi yokonza zotsekera pachaka yachepetsedwa ndi maola opitilira 40, ndipo ndalama zonse zogwirira ntchito ndi kukonza zidachepetsedwa ndi 60%. Panthawi imodzimodziyo, yapewa kuopsa kwa chilengedwe monga kutayikira kwa zinthu zomwe zimadza chifukwa cha kugwa kwa liner{8}}, kupititsa patsogolo ubwino wa zachuma ndi zachilengedwe.
