Dabaru na Tace Karfe da Amfaninsu
Tace ƙarfe jerin hanyoyin ƙarfe ne da aka yi niyya don ƙara tsarkin ƙarfe daga kayansa—ko ma'adinai, mai mai da hankali, ko kuma tsarin narkewar ƙarfe na farko (ƙarfe mai ɗanɗano). A aikace-aikacen masana'antu, tacewa ta wuce kawai "yin tsarkake ƙarfe," amma kuma ta ƙunshi rage matakan wasu ƙazanta don cika ƙa'idodin da ake buƙata don takamaiman aikace-aikace. Misali, jan ƙarfe don kebul na lantarki yana buƙatar tsarki mai yawa don ingantaccen watsawa. A halin yanzu, ƙarfe mai ƙarfe don gini zai iya jure wasu abubuwan da aka haɗa matuƙar halayen injinansa sun dace. Wannan labarin ya tattauna manyan dabarun tace ƙarfe tare da misalan aikace-aikacensu a fannoni daban-daban.
Me yasa tace ƙarfe yake da muhimmanci?
Rashin tsafta a cikin karafa na iya yin tasiri sosai ga halayen jiki da sinadarai, kamar su wutar lantarki/zafin zafi, juriya ga tsatsa, ƙarfin tauri, juriya, da kuma halayen walda ko siminti. Ko da ƙananan adadin ƙazanta na iya haifar da lahani ga samfura, kamar karyewa a wasu yanayin zafi, saurin fashewa, ko rage juriya ga iskar shaka. Saboda haka, tace ƙarfe muhimmin mataki ne a cikin sarkar samarwa - daga haƙar ma'adinai da sarrafa ma'adinai zuwa narkewa da ƙera.
Bayan aiki, tacewa ta ƙunshi batutuwan aminci da muhalli. Rashin datti kamar sulfur, phosphorus, arsenic, ko gubar na iya yin tasiri ga hayakin da ake fitarwa da kuma sharar da ake fitarwa, wanda ke buƙatar kulawa don bin ƙa'idodi.
1) Tace sinadarin pyrometallurgical (bisa ga yawan zafin jiki)
Pyrometallurgy yana amfani da yanayin zafi mai yawa don oxidize, tururi, ko raba ƙazanta ta hanyar amsawa da fluxes da slag. Yawanci ana yin gyaran pyrometallurgical bayan fara aikin narkewa.
a. Zaɓaɓɓen iskar shaka da tsaftacewa tare da slag
A wannan dabarar, ƙazanta waɗanda suka fi sauƙin oxidize fiye da ƙarfen tushe ana mayar da su zuwa oxides kuma slag ɗin ya kama su. Ƙara kwararar ruwa (kamar lemun tsami/limestone don samar da CaO) yana taimakawa wajen ɗaure ƙazantawar oxide cikin slag wanda za a iya raba shi da ƙarfen da aka narke.
Misalan aikace-aikace:
– Yin Karfe: Tsarin aiki na yau da kullun kamar Basic Oxygen Furnace (BOF) yana lalata carbon, silicon, manganese, phosphorus, da wasu sulfur. Alkaline slag yana taimakawa wajen ɗaure phosphorus, yana rage yawan abin da ke cikinsa.
– Tace Tagulla: A matakin "tace wuta", ana hura iskar oxygen don ya yi kauri ga wasu ƙazanta, sannan a yi "poling" (rage haske) don kada iskar oxygen da ke cikin tagulla ta wuce gona da iri.
b. Ragewa da canzawa (ƙafewa)
Wasu karafa ko ƙazanta suna da ƙarancin ruwan zafi, don haka ana iya raba su bisa ga bambance-bambancen da ke tsakanin canjin yanayi. Wannan dabarar ta dace da karafa kamar zinc (Zn) ko Mercury (Hg), da kuma cire ƙazanta masu canzawa.
Misalan aikace-aikace:
– Tsaftace zinc: Wasu hanyoyin samar da zinc suna amfani da distillation don ƙara tsarkin zinc na narkewa.
– Cire ƙazanta masu canzawa: A wasu hanyoyin, ana iya raba ƙazanta kamar cadmium saboda sun fi ƙarfin canzawa fiye da babban ƙarfe.
Fa'idodin pyrometallurgy sun haɗa da yawan samar da kayayyaki da kuma dacewarsa da sarrafa su da yawa. Duk da haka, rashin amfanin sa sun haɗa da buƙatar makamashi mai yawa da kuma yuwuwar fitar da iskar gas (misali, SO₂) idan ba a sarrafa ta da tsarin sarrafawa ba.
2) Tace ruwa (wanda aka yi bisa ga maganin ruwa)
Hydrometallurgy yana amfani da halayen sinadarai a cikin matakin mafita, yawanci ta hanyar manyan matakai uku: cirewa, rabuwa/tsarkakewa na mafita, da dawo da ƙarfe kamar hazo ko amfani da wutar lantarki.
a. Zubewa da tsarkakewar mafita
Ana narkar da ma'adinin ko sinadarin acid, tushe, ko kuma wani abu mai haɗa sinadarai. Sannan ana tsarkake ruwan daga ƙazanta ta amfani da dabarun kamar ruwan sama mai zaɓi, musayar ion, ko kuma cirewar sinadarai.
Misalan aikace-aikace:
– Nickel da cobalt: Yawancin hanyoyin zamani suna sarrafa laterite ko sulfide ta hanyar cire sinadarin, sannan su tsarkake maganin don raba Ni da Co.
– Zinariya: A tsarin cyanidation, zinare yana narkewa a matsayin hadadden abu, sannan a raba shi da maganin ta amfani da kunna carbon adsorption da ƙarin matakai.
b. Cirewar sinadaran (SX)
SX yana amfani da bambance-bambancen da ke cikin alaƙar ƙarfe da ions ga wasu sinadarai na halitta, don haka ana iya "matsar da ƙarfen da aka nufa" daga matakin ruwa zuwa matakin halitta, sannan a mayar da shi (a cire shi) zuwa mafi tsaftataccen bayani.
Misalan aikace-aikace:
– Tagulla (SX-EW): Ana tsarkake ruwan da ke fitar da ruwa da SX, sannan a cire jan ƙarfe ta hanyar amfani da electrowinning don ya zama babban cathode na jan ƙarfe.
Ana ɗaukar Hydrometallurgy a matsayin mafi sassauƙa kuma sau da yawa yana samar da tsarki mai yawa, amma yana buƙatar kulawa da sinadarai masu kyau da kuma kula da ruwan sharar gida mai kyau.
3) Tace wutar lantarki (electrolytic refining da electrowinning)
Tace ƙarfe (Electrolytic refining) wata hanya ce mai matuƙar muhimmanci wajen samar da ƙarfe masu tsafta sosai. Manufar ita ce a yi amfani da wutar lantarki don narkar da ƙarfe daga anode sannan a sake sanya shi a kan cathode.
a. Fasawa da Wutar Lantarki
Anode ƙarfe ne mara tsarki, cathode ɗin sirara ne na ƙarfe mai tsarki, kuma electrolyte shine ruwan gishirin ƙarfe. Ƙarfe mai tsarki yana fitowa a kan cathode ɗin, yayin da wasu ƙazanta ke faɗuwa kamar yadda ƙazanta mai anode ko kuma su ci gaba da narkewa.
Misalan aikace-aikace:
– Tagulla: Yana samar da kathodes na tagulla masu tsarki (galibi ana amfani da su azaman masu amfani da wutar lantarki). Karafa masu daraja kamar azurfa da zinariya galibi ana tattara su a cikin slame na anode don ƙarin sarrafawa.
– Nickel: Electrorefining yana samar da nickel mai inganci don haɗawa da amfani da plating.
b. Yin amfani da wutar lantarki
Sabanin yadda ake sarrafa electrorefining, electrowinning yana fitar da ƙarfe kai tsaye daga ruwan leaching/refining, ba daga anode na ƙarfe mai ɗanɗano ba.
Misalan aikace-aikace:
– SX-EW jan ƙarfe, zinc, da wasu ƙarfe da dama: ana amfani da su sosai saboda suna iya samar da samfuran cathode masu tsarki.
Amfanin tsarin electrolytic shine tsarkin da ya fi kyau da kuma kyakkyawan tsarin sarrafawa, amma saka hannun jari a wutar lantarki da kuma buƙatar ingantaccen electrolyte sune muhimman abubuwa.
4) Tsarkakewa ta musamman don tsarki mai matuƙar girma
Don dalilai na lantarki, na gani, ko bincike, tsarkin ƙarfe na iya kaiwa kashi 99,99% (4N) ko sama da haka. A nan ne ake amfani da dabarun musamman.
a. Gyaran yanki
Ana narkar da ƙarfen a cikin wani ƙaramin yanki da ke tafiya tare da sandar. Datti yakan narke da kyau a lokacin ruwa fiye da na daskararru, don haka ana tura su tare da motsi na yankin narkewar kuma suna taruwa a ƙarshen sandar, wanda daga nan sai a yanke shi.
Misalan aikace-aikace:
– Silicon, germanium, gallium: yana da matuƙar muhimmanci a masana'antar semiconductor.
b. Tace injin tsotsa
A ƙasan matsin lamba, ƙazanta masu canzawa suna ƙafewa cikin sauƙi. Wannan dabarar tana da tasiri wajen rage gurɓataccen iskar gas (hydrogen, nitrogen) ko ƙazanta masu canzawa.
Misalan aikace-aikace:
- Karfe na musamman da kuma ƙarfe masu ƙarfi: cire gas ɗin injin yana ƙara tauri da rage porosity.
– Titanium da zirconium: a wasu matakai, sarrafa yanayi yana da matuƙar muhimmanci saboda yawan amsawarsu ga iskar oxygen da nitrogen.
5) Aiwatar da sakamakon tace ƙarfe a sassa daban-daban
a. Wutar lantarki da na'urorin lantarki
Ana amfani da ƙarfe masu tsarki kamar jan ƙarfe da aluminum a cikin kebul, sandunan bus, da kayan haɗin jagora. Tsafta mai tsarki ya zama dole don ƙarancin asarar wutar lantarki da ƙarancin samar da zafi. A cikin kayan lantarki, ƙarfe masu tsarki da semiconductor suna tallafawa aikin transistor, firikwensin, da guntu.
b. Sufuri da gini
A cikin ƙarfe da ƙarfe, tacewa yana taimakawa wajen sarrafa ƙazanta kamar sulfur da phosphorus, wanda zai iya haifar da karyewa. Sakamakon haka shine abu mai ƙarfi, mai jure nauyi, kuma mafi aminci wanda ya dace da gadoji, gine-gine, jiragen ruwa, har ma da firam ɗin abin hawa.
c. Masana'antar sinadarai da makamashi
Haɗaɗɗun ƙarfe masu tushen nickel, chromium, da molybdenum suna buƙatar tsauraran matakan sarrafawa don jure tsatsa da yanayin zafi mai yawa - misali, a cikin reactor na sinadarai, bututun mai, injinan iskar gas, da kuma tashoshin wutar lantarki. Tacewa yana taimakawa wajen tabbatar da cewa ƙazanta masu haɓaka tsatsa ba su wuce iyaka ba.
d. Kayan ado da karafa masu daraja
Ana tace zinare, azurfa, da platinum don cimma takamaiman maki (misali, zinare 24K) ko kuma a yi amfani da su a cikin kayan ado. Tsarin tacewa kuma yana ba da damar dawo da karafa masu daraja daga tarkacen lantarki da kuma laka na anode.
Kammalawa
Dabaru na tace ƙarfe sun haɗa da hanyoyin pyrometallurgical, hydrometallurgical, da electrolytic, da kuma hanyoyi na musamman kamar tace yanki da tace injin tsotsa. Zaɓin hanyar ya dogara da nau'in ƙarfe, siffar kayan da aka yi amfani da su, nau'in da abubuwan da ke cikin ƙazanta, abin da ake nufi da tsarki, da kuma la'akari da tattalin arziki da muhalli. A aikace, masana'antu sau da yawa suna haɗa dabaru da dama don cimma sakamako mafi kyau. Tare da tsaftacewa mai kyau, ƙarfe na iya cika ƙa'idodi masu inganci - daga kebul na lantarki da tsarin gini zuwa abubuwan semiconductor - waɗanda sune ginshiƙin fasahar zamani.
Idan kuna so, zan iya daidaita wannan labarin don ya zama mafi ilimi (tare da ambato da zane-zanen kwararar aiki), ko kuma in mai da hankali kan wani takamaiman ƙarfe kamar jan ƙarfe, aluminum, ko nickel.
