Mfundo ndi Njira Zogwiritsira Ntchito Ma Metal Ore
Kukonza miyala yachitsulo ndi njira zingapo zauinjiniya zomwe zimagwiritsidwa ntchito kusintha zinthu zomwe zachotsedwa (miyala) kukhala zinthu zamtengo wapatali, monga zinthu zokhuthala, zitsulo zoyera, kapena zitsulo zosungunulira. Miyala yatsopano yomwe yachotsedwa nthawi zambiri imasakanizidwa ndi zinthu zosafunika (gangue), imasiyana kukula, ndipo imakhala ndi chitsulo chomwe sichikwaniritsa zofunikira zamafakitale. Chifukwa chake, mfundo zasayansi ndi njira zoyenera zokonzera zinthu zimafunika kuti pakhale zokolola zambiri zachitsulo, ndalama zogwiritsidwa ntchito bwino, komanso kuyang'anira zovuta zachilengedwe.
Mfundo Zoyambira Zogwiritsira Ntchito Ma Metal Ore
1. Kusiyana pakati pa Katundu Wathupi ndi Wamankhwala
Cholinga chachikulu cha kukonza miyala ndikugwiritsa ntchito kusiyana kwa makhalidwe pakati pa mchere wamtengo wapatali ndi zinthu zosafunika. Kusiyana kumeneku kungaphatikizepo kuchulukana, mphamvu ya maginito, mphamvu zamagetsi, kukula kwa tinthu tating'onoting'ono, mphamvu ya pamwamba (hydrophobic/hydrophilic), komanso ngakhale reactivity ya mankhwala. Pozindikira makhalidwe akuluakulu a mchere, ogwiritsa ntchito amatha kusankha njira yothandiza kwambiri yolekanitsira.
2. Kumasulidwa kwa Migodi
Kumasuka ndi gawo lomwe mchere wamtengo wapatali umatulutsidwa ku zinthu zosafunika, zomwe zimapangitsa kuti zilekanitsidwe. Kumasuka nthawi zambiri kumachitika kudzera mu kuphwanya (kuphwanya ndi kupukuta). Mlingo wa kumasuka ndi wofunikira kwambiri kuti kulekanitsa kupambane; ngati kukula kuli kwakukulu kwambiri, mcherewo umakhalabe "wotsekeka," zomwe zimapangitsa kuti kulekanitsa kukhale kovuta. Komabe, ngati kukula kuli kochepa kwambiri, ndalama zamagetsi zimawonjezeka ndipo chiopsezo cha kutayika kwa chitsulo m'malo otsala chimawonjezeka. Chifukwa chake, kukonza kukula ndikofunikira kwambiri.
3. Kulinganiza pakati pa Kuchira ndi Giredi
Pakukonza miyala, pali zolinga ziwiri zazikulu: kubwezeretsa (chiwerengero cha chitsulo chomwe chabwezedwa) ndi kalasi (kuchuluka kwa chitsulo chomwe chili mu chinthucho). Izi nthawi zambiri zimakhala zotsutsana: kalasi ikakwera, kubwezeretsa kumachepa, ndipo mosemphanitsa. Machitidwe amakampani amayang'ana kwambiri malo abwino ogwirira ntchito, poganizira mitengo ya zinthu, ndalama zogwirira ntchito, ndi zofunikira za fakitale yosungunulira kapena yoyeretsera.
4. Kugwiritsa Ntchito Mphamvu ndi Madzi Moyenera
Comminution ndi imodzi mwa makampani omwe amagwiritsa ntchito mphamvu zambiri m'mafakitale opangira mchere. Madzi amafunikanso kuti agwiritsidwe ntchito m'magulu, kuyandama, ndi kunyamula matope. Mfundo zamakono zimagogomezera kugwiritsa ntchito mphamvu moyenera kudzera mu kusankha zida zoyenera (monga HPGR, SAG mill) komanso kugwiritsa ntchito bwino madzi kudzera mu njira zobwezeretsanso madzi ndi kusamalira matope.
5. Chitetezo ndi Kasamalidwe ka Zachilengedwe
Kukonza miyala kumapanga zinyalala monga momwe zimakhalira ndi mipata, fumbi, komanso kutulutsa madzi m'migodi ya asidi. Mfundo zazikulu zikuphatikizapo kuchepetsa kutulutsidwa kwa zinthu zoopsa, kuwongolera pH ndi zitsulo zosungunuka, komanso kusamalira mipata mosamala. Chitetezo pantchito ndichofunikanso, chifukwa njira zambiri zimaphatikizapo makina ozungulira, kuthamanga kwambiri, ndi mankhwala.
Njira Zazikulu Zogwiritsira Ntchito Ma Metal Ore
Kawirikawiri, kukonza zitsulo kungagawidwe m'magulu atatu akuluakulu: kukonza thupi (mineral dressing), pyrometallurgy, ndi hydrometallurgy. Mwachizolowezi, kayendedwe ka njira nthawi zambiri kamakhala kuphatikiza njira zingapo.
1. Kukonza Thupi (Kupindulitsa)
Kukonzekera kwa thupi cholinga chake ndi kupanga zinthu zochulukirapo kwambiri musanayambe ntchito yochotsa zitsulo.
a. Kuphwanya ndi Kupera
- Kuphwanya kumachitika kuti muchepetse kukula kwa miyala kuchokera ku zidutswa zazikulu kupita ku kukula komwe fakitale ingathe kugwira.
- Kupera kumagwiritsa ntchito mphero kuti ipange kukula kocheperako kuti mchere wamtengo wapatali utuluke.
Zipangizo zodziwika bwino: chotsukira nsagwada, chotsukira cha cone, mphero ya mpira, mphero ya ndodo, mphero ya SAG. Gawoli nthawi zambiri limatsagana ndi kugawa pogwiritsa ntchito zotchingira kapena ma hydrocyclone kuti alekanitse kukula kwa tinthu.
b. Kulekanitsa Mphamvu Yokoka
Njirayi imagwiritsa ntchito kusiyana kwa kuchuluka kwa mchere wamtengo wapatali ndi zinthu zosafunika. Ndi yoyenera miyala yamtengo wapatali yokhala ndi mchere wolemera monga golide wopanda pake, cassiterite (SnO₂), ndi mchere wina wachitsulo.
Zipangizo: jig, spiral concentrator, shaking table, sluice box, ndi centrifugal concentrator. Ubwino wake ndi kuphweka kwake komanso kufunika kochepa kwa mankhwala, koma mphamvu yake imachepa pa tinthu tating'onoting'ono kwambiri.
c. Kulekanitsa kwa Maginito
Amagwiritsidwa ntchito pa mchere wokhala ndi mphamvu zamaginito, monga magnetite, komanso kulekanitsa zodetsa zachitsulo kuchokera ku miyala ina yamafakitale. Pali kusiyana kwa maginito kotsika komanso kokwera kutengera mtundu wa mcherewo.
Zipangizo: cholekanitsa maginito cha ng'oma, cholekanitsa maginito chapamwamba kwambiri.
d. Kuyandama (Kuyandama kwa Chipatso)
Njira yoyandama ndiyo njira yomwe imagwiritsidwa ntchito kwambiri popanga zitsulo monga mkuwa, lead, zinc, ndi nickel, komanso mchere wina wa oxide. Mfundoyi imagwiritsa ntchito kusiyana kwa mawonekedwe a pamwamba: mchere wina umapangidwa kukhala wopanda hydrophobic, zomwe zimawalola kuti azimatirira ku thovu la mpweya ndikuyandama ngati thovu, pomwe zonyansa zimatsalira mu zamkati.
Zinthu zofunika kwambiri: chosonkhanitsa, chofufumitsa, chosinthira (pH regulator), chochepetsa nkhawa, choyambitsa. Kuyandama kwa madzi kumakhala kosinthasintha kwambiri, koma kumafuna kuwongolera mwamphamvu kwa mankhwala ndi magwiridwe antchito.
e. Kulekanitsa Kochokera pa Kukula (Kukula)
Nthawi zina, kusiyana kwa kukula kwa tinthu timeneti pambuyo pa kugawanika kumakhala kofunikira kwambiri kotero kuti kulekanitsa kosavuta mwa kufufuza kapena kugawa m'magulu kumathandiza kukonza magwiridwe antchito otsatira. Kukula sikugwira ntchito kokha kuti kuwonjezere giredi, koma ndikofunikira ngati gawo lothandizira.
2. Pyrometallurgy (Kuchotsa ndi Kutentha Kwambiri)
Pyrometallurgy ndi njira yochotsera zitsulo pogwiritsa ntchito kutentha kwambiri, nthawi zambiri kumafuna njira zochepetsera okosijeni.
a. Kuphika ndi Kuwotcha
- Kutenthetsa chitsulocho kuti chichotse madzi, CO₂, kapena zinthu zina zofooka.
- Kuwotcha kumapangitsa kuti sulfide ikhale ma oxides ndi SO₂, zomwe zimapangitsa kuti miyalayo isungunuke kapena kuchotsedwa.
Chitsanzo: kuwotcha zinthu zopangidwa ndi mkuwa kapena zinc sulfide.
b. Kusungunula
Kusungunula kumaphatikizapo kusungunula concentrate mu uvuni kuti ilekanitse chitsulo kapena matte (chisakanizo cha sulfide yachitsulo) ndi slag. Ma fluxes monga silika kapena laimu amawonjezeredwa kuti amange zonyansa.
Chitsanzo: kusungunula mkuwa kumapanga mkuwa wosasalala womwe umayengedwanso.
c. Kusintha ndi Kuyeretsa Kutentha
Chitsulo chosalimba kapena chopanda mphamvu nthawi zambiri chimakhala ndi zinthu zosafunika. Njira yosinthira zinthu imawonjezera zinthu zosafunikazi, kuzilekanitsa ndi zinthu zotsalira kapena mpweya. Njira zina zingaphatikizepo kuyeretsa moto kapena kuyeretsa magetsi kuti zikhale zoyera kwambiri.
Ubwino wa pyrometallurgy ndi kuchuluka kwa ntchito mwachangu komanso kuyenerera kugwiritsidwa ntchito kwakukulu, koma ndalama zamagetsi zimakhala zambiri ndipo mpweya woipa uyenera kulamulidwa.
3. Hydrometallurgy (Kuchotsa Mayankho)
Hydrometallurgy imagwiritsa ntchito mankhwala omwe amapangidwa mu gawo lamadzimadzi kuti asungunule zitsulo kenako nkuzilekanitsa ndi yankho.
a. Kutulutsa madzi
Kutulutsa madzi kumasungunula chitsulo kuchokera ku miyala kapena kusakaniza pogwiritsa ntchito zosungunulira zina.
– Pa mkuwa okusayidi: yankho la sulfuric acid (H₂SO₄).
– Pa golide: cyanidation (NaCN) yokhala ndi pH control, kapena njira zina monga thiosulfate nthawi zina.
– Pa nickel laterite: leaching yamphamvu kwambiri (HPAL) pogwiritsa ntchito asidi pa kutentha kwakukulu ndi kupanikizika.
b. Kulekanitsa ndi Kuyeretsa Mayankho
Pambuyo pochotsa madzi m'thupi, yankho lokhala ndi zitsulo zambiri (njira yochotsera madzi m'thupi yokhala ndi pakati) limakonzedwa ndi:
– Kutulutsa zosungunulira (SX): kumasamutsa ayoni achitsulo kupita ku gawo lachilengedwe.
– Kusinthana kwa ma ion: utomoni umagwira ma ion ena achitsulo.
– Kugwa kwa mvula: kugwetsa zitsulo monga ma hydroxide, sulfide, kapena mchere winawake.
c. Kupambana ndi Kukonzanso Ma Electro
– Kupambana kwa electro (EW) kumachititsa kuti chitsulo chichoke mu yankho la cathode kudzera mu mphamvu yamagetsi, zomwe zimapangitsa kuti chitsulo choyera kwambiri (monga cathode copper).
- Kuyeretsa zitsulo zamagetsi kumayeretsa zitsulo zosaphika kukhala zoyera kwambiri, zomwe zimapezeka mu mkuwa, nickel, ndi zitsulo zamtengo wapatali.
Kugwiritsira ntchito hydrometallurgy nthawi zambiri kumakhala kosankha bwino ndipo kungakhale kosamalira chilengedwe ngati kusamalidwa bwino, koma kumafuna kuyang'aniridwa mosamala kwa mayankho, ma reagents, ndi madzi otayira omwe angakhalepo.
Kutseka
Mfundo ndi njira zogwiritsira ntchito miyala yachitsulo zonse zimachokera ku cholinga chimodzi: kuwonjezera phindu la miyala yamtengo wapatali kudzera mu kulekanitsa bwino mchere wamtengo wapatali ndi kuchotsa zitsulo. Njira zopezera phindu monga kusintha, kulekanitsa mphamvu yokoka, kulekanitsa maginito, ndi kuyandama zimagwira ntchito yofunika kwambiri popanga zinthu zokhazikika zomwe zili ndi kalasi yovomerezeka. Kuphatikiza apo, pyrometallurgy ndi hydrometallurgy ndi njira zazikulu zotulutsira ndi kuyeretsa zitsulo, kutengera mawonekedwe a miyala yamtengo wapatali, kukula kwa kupanga, komanso mtengo ndi zinthu zomwe zimafunika pa chilengedwe.
Mu machitidwe amakono, kukonza bwino miyala yachitsulo kumatsimikiziridwa ndi kuphatikiza kwa mineralogy, process engineering, kuwongolera khalidwe, ndi udindo pa chilengedwe. Ndi zatsopano zaukadaulo—monga masensa osankhika, ma grinding circuits okonzedwa bwino, flotation yogwira ntchito bwino kwambiri, komanso njira zosankhidwa bwino zochotsera ndi kuyeretsa—makampaniwa akupitilizabe kupita patsogolo ku njira zogwiritsira ntchito mphamvu zochepa, zosunga madzi bwino, komanso zokhazikika.
