Amasu Okwenza Insimbi Nge-Ore Ukuze Isetshenziswe Ezimbonini
Ukukhiqizwa kwezinsimbi ezivela kuma-ore kuyisisekelo esibalulekile semikhakha ehlukahlukene yezimboni, kusukela ekwakheni nasezimotweni kuya emandleni kanye nase-elekthronikhi. Cishe zonke izinto zensimbi ezisetshenziswa ngabantu zivela kumaminerali asemathunjini omhlaba, okumele acutshungulwe ngochungechunge lwezinyathelo zobuchwepheshe ukuze abe yizinsimbi ezihlanzekile noma ama-alloy anezakhiwo ezidingekayo zemishini namakhemikhali. Le nqubo, eyaziwa ngokuthi i-extractive metallurgy, ihlanganisa ukumbiwa kwemigodi, ukulungiswa kwe-ore, ukuhlukaniswa kwamaminerali ayigugu, ukukhishwa kwensimbi, kanye nokucwengisiswa. Emisebenzini yezimboni, ukukhetha ubuchwepheshe kuthonywa kakhulu uhlobo lwe-ore, okuqukethwe kwensimbi, ukungcola, ezomnotho, izidingo zamandla, kanye nomthelela wemvelo.
1. Izici Zensimbi Eyigugu kanye Nokunqunywa Kwendlela Yokukhipha
Itshe eliyigugu liyidwala noma iminerali equkethe insimbi enokugcwala okuphezulu okwanele ukuthi imbiwe futhi icutshungulwe ngokwezomnotho. Insimbi ingaba khona njenge-oxide (isb., i-Fe₂O₃ ku-hematite), i-sulfide (isb., i-CuFeS₂ ku-chalcopyrite), i-carbonate (isb., i-ZnCO₃ ku-smithsonite), noma ngisho ne-element yamahhala (isb., igolide). Uhlobo ngalunye lwamakhemikhali ludinga indlela ehlukile. Amatshe e-oxide kulula ukuwanciphisa abe yinsimbi, kuyilapho amatshe e-sulfide ngokuvamile edinga inqubo yokuthosa ukuze aguqule i-sulfide ibe yi-oxide ngaphambi kokunciphisa noma ukuncibilikisa.
Ngaphezu kwalokho, okuqukethwe kwensimbi kanye nohlobo lwe-gangue (idwala lokungcola njenge-silica, i-alumina, noma i-limestone) kunquma isu lokuhlukanisa. Ama-ore asezingeni eliphansi avame ukudinga ukuhlushwa okujulile ukuze kukhishwe kahle okulandelayo. Embonini yanamuhla, ukuhlaziywa kwe-mineralological kanye namakhemikhali (isb., i-XRF, i-XRD, noma ukuhlolwa) kwenziwa ukuze kutholakale indlela yenqubo engcono kakhulu.
2. Ukulungiswa Kwensimbi: Ukuchoboza Nokugaya
Isigaba sokuqala sokucubungula i-ore esitshalweni ukunciphisa usayizi ukuze kukhishwe amaminerali abalulekile ku-gangue. Le nqubo ivame ukuqala ngokuchoboza kusetshenziswa i-jaw crusher noma i-cone crusher ibe usayizi wamasentimitha ambalwa. Lokhu kulandelwa ukugaya kusetshenziswa i-ball mill noma i-SAG mill ibe usayizi wezinhlayiya ezincane, ngezinye izikhathi kuze kufike emashumini ama-micron, kuye ngezidingo zenqubo yokuhlukanisa.
Isihluthulelo sempumelelo kulesi sigaba ukuthola ibhalansi phakathi kokukhululwa kwezimbiwa kanye nokusetshenziswa kwamandla. Ukugaya kahle kakhulu kungandisa izindleko zikagesi futhi kube nzima ukuhlukana, kuyilapho ukugaya kakhulu kushiya amaminerali abalulekile eboshelwe ku-gangue, kunciphisa ukubuyiselwa kwamandla.
3. Ukuhlushwa Kwensimbi Eyigugu: Ukuhlukaniswa Kwamaminerali Ayigugu
Uma usayizi wezinhlayiya usufanele, i-ore iyacebiswa kusetshenziswa izindlela zokuhluza ukuze kwandiswe okuqukethwe yinsimbi. Amanye amasu avame ukusetshenziswa yile:
1. Ukuntanta (ukuntanta kwegwebu)
Isebenza kahle kakhulu kuma-ore e-sulfide njengethusi, i-lead, ne-zinc. Isimiso ukusebenzisa umehluko ezimpahleni zamaminerali angaphezulu. Ama-reagent athile enza amaminerali ayigugu angangeni manzi, anamathela kuma-bubble omoya, bese entanta njengegwebu, eliqoqwa njenge-concentrate.
2. Ukuhlukaniswa kwamandla adonsela phansi
Isetshenziswa uma kunomehluko omkhulu wobuningi, njengakuma-ore egolide aluhlaza, i-cassiterite (SnO₂), noma amaminerali athile ensimbi. Imishini ingaba yi-jig, i-spiral concentrator, noma itafula lokushukumisa.
3. Ukuhlukaniswa kwamagnetic
Ifanele amaminerali amagnetic njenge-magnetite (Fe₃O₄) noma ukuhlukanisa ukungcola okuthile. Ukuqina kwamagnetic kungalungiswa kusuka phansi kuya phezulu kuye ngezakhiwo zamaminerali.
4. Ukuwasha nokuhlunga
Kweminye insimbi, ukungcola kobumba kungancishiswa ngokuwasha. Okwamanje, ukuhlunga kungenziwa ngesandla noma ngokusebenzisa ukuhlunga okusekelwe kunzwa ukuze kuhlukaniswe amatshe asezingeni eliphansi ngaphambi kokucutshungulwa okwengeziwe.
Umphumela walesi sigaba uwukugcwala okucebile ngensimbi kanye nezinsalela (insalela) okumele ziphathwe ngokuphephile.
4. I-Pyrometallurgy: Ukukhishwa Kwezinsimbi Kusetshenziswa Ukushisa Okuphezulu
I-pyrometallurgy iyindlela yokukhipha izinsimbi ngokusebenzisa ukusabela kokushisa okuphezulu, ngokuvamile okubandakanya ukuncibilikisa nokunciphisa. Yakha umgogodla wokukhiqizwa kwensimbi kanye nezinsimbi eziningi ezingezona i-ferrous.
a. Ukuthosa kanye Nokuphekwa Kwe-Calcination
– Ukuthosa: ukufudumeza i-sulfide ore nge-oxygen ukuze kukhiqizwe ama-oxide kanye ne-SO₂. Isibonelo: ukucubungula i-copper sulfide concentrate ngaphambi kokuncibilikisa.
– Ukwakheka kwe-Calcination: ukushisa ama-carbonate noma ama-hydroxide ukuze kukhishwe i-CO₂ noma i-H₂O, isibonelo kwamanye ama-zinc ores.
b. Ukuncibilikisa Nokunciphisa
Enqubweni yokuncibilikisa, i-ore noma i-concentrate ixutshwa ne-reducing agent (njenge-coke noma i-carbon) kanye ne-flux (njenge-limestone) bese ishiswa esithandweni. I-flux isiza ukubopha ukungcola kube yi-slag, ehlukana nensimbi encibilikisiwe.
Isibonelo esidumile kakhulu isithando somlilo sensimbi: i-iron ore incishiswa yi-carbon monoxide ibe yi-liquid iron (insimbi eshisayo), kuyilapho i-silica nokunye ukungcola kwakheka i-slag kanye ne-CaO evela ku-limestone.
c. Ukuguqulwa Nokucwengisisa Kokuqala
Ethusini, ukuncibilikisa ngokuvamile kukhiqiza i-matte (ingxube yama-sulfide), eguqulwa ukuze kwandiswe okuqukethwe kwethusi. Ukuze insimbi ibe yinsimbi, insimbi eshisayo icutshungulwa ku-Basic Oxygen Furnace (BOF) noma i-Electric Arc Furnace (EAF) ukuze kuncishiswe ikhabhoni futhi kulawulwe ukwakheka kwe-alloy.
I-pyrometallurgy iphumelela kakhulu ngomthamo omkhulu kanye nesivinini senqubo, kodwa idinga amandla aphezulu kanye nezinhlelo zokulawula ukukhishwa komoya (uthuli, i-SO₂, i-CO₂).
5. I-Hydrometallurgy: Ukukhishwa Kwezinsimbi Ngezixazululo
I-Hydrometallurgy isebenzisa ukuncibilika okukhethiwe kwezinsimbi kusuka ku-ore zibe yisisombululo (ukuleaching), bese ibuyisa izinsimbi ngemvula, ukukhipha i-solvent, noma ukuwina ngogesi. Le ndlela ivame ukukhethwa kuma-ore asezingeni eliphansi noma ayinkimbinkimbi.
a. Ukuhlanzwa
Uhlobo lokuphuma kwensimbi luncike ensimbini kanye namaminerali:
– I-asidi ye-sulfuric yama-oxide athile ethusi noma ama-laterites.
– Ukufakwa kwe-cyanidation kwegolide nesiliva (ngokuphathwa kokuphepha okuqinile kakhulu).
– Ukuhlanzwa kwe-alkali kwe-bauxite (inqubo ye-Bayer ikhiqiza i-alumina).
Ukuhlanzwa kungenziwa enqwabeni yokuhlanzwa, ethangini lokuhlanzwa (i-reactor), noma e-autoclave ecindezelwe ukuze kutholakale ukusabela okudinga ukushisa/ukucindezela okuphezulu.
b. Ukuhlukaniswa Kwensimbi Nokubuyiselwa Kwayo
Ngemva kokuba insimbi incibilikisiwe, isixazululo kumele sihlanzwe ekungcoleni:
– I-Solvent Extraction (SX) ihlukanisa ama-ion athile ensimbi isebenzisa izinyibilikisi eziphilayo.
– Ukuna kwemvula kunciphisa izinsimbi noma ukungcola ngokulungisa i-pH kanye nama-reagent.
– Ukunqoba ngogesi (EW) kubeka insimbi ku-cathode ngogesi, isibonelo kuthusi le-SX-EW elikhiqiza i-cathode enokuqukethwe okuphezulu kwe-Cu.
I-hydrometallurgy ivame ukukhetha kakhulu futhi inganciphisa ukukhishwa komoya, kodwa idinga ukuphathwa kahle kwamanzi amdaka kanye nokuqina kwemisila.
6. I-Electrometallurgy: Ukukhiqizwa Nokucwengisiswa Okusekelwe Kugesi
I-Electrometallurgy isebenzisa ugesi kagesi ukukhiqiza noma ukucwenga izinsimbi. Izicelo ezimbili ezibalulekile yilezi:
1. I-electrolysis kasawoti oncibilikisiwe
Isetshenziselwa i-aluminium. I-Alumina (Al₂O₃) incibilikiswa ku-cryolite encibilikisiwe bese ixutshwa ngogesi (inqubo ye-Hall-Héroult). Le ndlela idla amandla amaningi, kodwa isibe yindinganiso embonini ngoba i-aluminium kunzima ukuyinciphisa ngqo nge-carbon.
2. Ukuhlanza ngogesi
Ukucwenga izinsimbi ezifana nethusi: i-anode yethusi engcolile iyancibilika bese kuthi ithusi elimsulwa liwe phezu kwe-cathode. Ukungcola okuyigugu njengegolide noma isiliva kungaqoqwa njenge-slime ye-anode bese kucutshungulwa kabanzi.
I-Electrometallurgy ihamba phambili ekukhiqizeni ubumsulwa obuphezulu, kodwa incike ekutholakaleni kukagesi omningi kanye nokulawulwa kwenqubo okuqinile.
7. Ukulawulwa Kwekhwalithi, Ukuhlanganiswa, Nokwakhiwa Kwemikhiqizo Yezimboni
Izinsimbi ezikhishwe azivamile ukusetshenziswa ngqo ngaphandle kokulungiswa kokwakheka. Izimboni zivame ukwengeza izakhi zokuhlanganisa ukuze kufezwe izakhiwo ezithile: i-chromium ne-nickel yokumelana nokugqwala ensimbi engagqwali, noma i-magnesium ne-silicon kuma-aluminium alloys ukuze kuqiniswe futhi kukhiqizwe. Ukucubungula okwengeziwe kuhlanganisa ukukhipha igesi, ukususa i-sulfurization, kanye nokulawula i-oxygen ne-nitrogen. Umkhiqizo ube usubunjwa ngokukhipha, ukugoqa, ukubumba, noma ukukhipha ngokwezidingo zochungechunge lokuphakelwa kwezimboni.
8. Izici Zemvelo Nokuzinza
Imboni yokukhipha insimbi ibhekene nezinselele ezinkulu: ukukhishwa kwe-CO₂ okuvela ezinqubweni zokushisa, ukukhishwa kwe-SO₂ okuvela kuma-sulfide ores, kanye nokuphathwa kwama-tailings. Ngakho-ke, ubuchwepheshe besimanje buhlanganisa ukubanjwa kwesibabule ukukhiqiza i-sulfuric acid, ukusetshenziswa kwamandla avuselelekayo ekusetshenzisweni kwe-electrolysis, ukuvuselelwa kwamanzi ngenqubo, kanye nokuqina kwama-tailings kuya ezindinganisweni zokuphepha eziphakeme. Ngaphezu kwalokho, ukuvuselelwa kwensimbi (i-metallurgy yesibili) kubaluleke kakhulu ekunciphiseni ukuthembela kuma-ore amsulwa kanye nokunciphisa umthelela wekhabhoni.
I-Penutup
Inqubo yokukhiqiza izinsimbi ezivela kuma-ore ukuze zisetshenziswe ezimbonini ihilela uchungechunge lwezinqubo eziyinkimbinkimbi nezixhumene: kusukela ekulungiseleleni nasekugxiliseni, kuya ku-pyrometallurgy, i-hydrometallurgy, kanye ne-electrometallurgy. Insimbi ngayinye inomzila ohlukile ngokusekelwe ezicini zamakhemikhali zamaminerali kanye nezidingo zomnotho nezendawo ezungezile. Ngokuthuthuka kwezobuchwepheshe, imboni iyaqhubeka nokuya ezinqubweni ezisebenza kahle, ezikhethayo, nezisimeme—ukuze izidingo zensimbi zentuthuko kanye nokusungula izinto ezintsha zingahlangatshezwana nazo ngaphandle kokubeka engcupheni ukuphepha kanye nokusimama kwemvelo.
