I-Sodium Cyanide (NaCN) — Izinqubo Zokukhiqiza, Ukuqhathaniswa Kwekhwalithi Yomkhiqizo kanye Nochungechunge Lwenani Lomkhakha

Isingeniso

Sodium i-cyanide (I-NaCN) iyikhemikhali yezimboni eyisisekelo ezimayini namakhemikhali amahle, ikakhulukazi asetshenziselwa ukuvuza igolide nezinye izinsimbi eziyigugu. United Chemical ilungiselela lesi siqalisi semboni ukuchaza, ngolimi olulula kodwa olusezingeni eliphezulu, izinqubo zokukhiqiza eziyinhloko zezimboni I-Sodium Cyanide, izici zobuchwepheshe kanye nomehluko wekhwalithi yomkhiqizo wenqubo ngayinye, uchungechunge lwenani lemboni, namandla okuhweba ngamazwe ngamazwe. Umgomo uwukwazisa amakhasimende, ozakwethu kanye nomphakathi wonkana kuyilapho kugcizelela ukuphepha, ukuthobela imithetho kanye nokuhlinzeka ngobuqotho.

Inothi lokuphepha:i-sodium cyanide inobuthi kakhulu. Ukukhiqiza, ukuthutha, ukugcinwa kanye nokusetshenziswa kufanele kulandele ngokuqinile imithetho yokuphepha kwezwe kanye nendawo oya kuyo, yemvelo kanye neyokuthutha impahla eyingozi. Lesi sihloko senzelwe izinjongo zokwazisa nokuphromotha kuphela futhi siyakwenza hhayi hlinzeka ngemininingwane yokusebenza noma izindlela zokupheka ezingase zisetshenziswe kabi.

I-1. Kuyini I-sodium cyanide? (Kafushane)

I-sodium cyanide (NaCN) iwusawoti omhlophe, oyi-cubic crystalline inorganic owakha izakhiwo ezincibilikayo ezinegolide nezinye izinsimbi ezinhle. Ngenxa yalesi sakhiwo sisetshenziswa kakhulu ekulethweni kwamaminerali (ikakhulukazi i-cyanidation yegolide). Iphinde ithole ukusetshenziswa kwe-electroplating, i-pharmaceutical kanye ne-fine-chemical intermediates, i-agrochemical synthesis, nanjenge-reagent kulabhorethri. Ngenxa yobuthi bayo, ukuphatha okuqinile, ukulungela izimo eziphuthumayo nokulawulwa kwemvelo kubalulekile kulo lonke uchungechunge lokuhlinzeka.

2. Imizila emikhulu yokukhiqiza yezimboni nezici zobuchwepheshe (izinga eliphezulu)

Imizila yokukhiqiza yezimboni eyayisetshenziswa ngokomlando noma esetshenziswa njengamanje ihlanganisa: ukuhlanganisa/ukuncibilika (komlando), indlela ye-An, ukuqhekeka kwamafutha alula, i-methanol–ammoniation, kanye nokutholwa komkhiqizo we-acrylonitrile (co-product). Ngezansi sifingqa inqubo ngayinye, ukufaneleka/imikhawulo yayo, nezici ezijwayelekile zekhwalithi yomkhiqizo ukusiza abathengi nozakwethu baqonde ubudlelwano bekhwalithi yenqubo.

1) Indlela yokuhlanganisa / yokuncibilikisa (yomlando)

Isifinyezo senqubo: umzila wesithando somlilo/ukuhlanganiswa okhiqiza udoti oqinile, owuketshezi nowomoya futhi odla amandla aphezulu.
Isimo: Iqedwe kakhulu embonini yesimanje ngenxa yokungalungi kwemvelo namandla.
Ikhwalithi yomkhiqizo ejwayelekile:

• Ukuhlanzeka (okuqukethwe kwe-NaCN): ngokuvamile iphansi futhi iyaguquguquka.

• Ukungcola kwe-organic/sulphur: uma kuqhathaniswa, kuya ngamafutha nezinto zokusetshenziswa.

• Izinsimbi ezinzima: ingase iphakanyiswe uma impahla eluhlaza noma okokusebenza kungalawulwa ngokuqinile.

• Umswakama / ukubhaka: umswakama ophezulu kanye nokungaqini kahle kwesitoreji uma ukomiswa/ngemuva kokwelashwa kunganele.

• Ifomu: izigaxa ezimahhadla noma izinhlayiya ezingajwayelekile; ngokuvamile kudinga ukucwengwa komfula.
  Ukufaneleka komfula: impofu ekusetshenzisweni kwebanga eliphezulu noma okubucayi (imithi, i-electronics); yamukeleka kuphela ezinhlelweni ze-low-spec lapho izindleko ziyisici esiyinhloko.

2) Indlela ka-An (Inqubo ka-An)

Isifinyezo senqubo: inqubo yabantu abadala evame ukusebenza eduze komfutho womoya, ayidingi okokufaka ukushisa kwangaphandle kwezinye izilungiselelo, futhi isebenzisa ugesi kancane uma kuqhathaniswa; Nokho, ngokuvamile kudinga imidiya ethile ye-catalytic kanye nezindleko ze-catalyst zingaba phezulu.
Ikhwalithi yomkhiqizo ejwayelekile:

• Uhlanzekile: okuphakathi kuya phezulu futhi kuzinzile ngokulawulwa okuhle kwenqubo.

• Ukungcola kwe-organic/sulphur: ngokuvamile aphansi uma izitoko nezilawuli zihlanzekile.

• Izinsimbi ezinzima: iyalawuleka ngokuphakelayo kanye nokuhlanzwa komfula.

• Umswakama / ukuzinza: ingafinyelela umswakama ophansi kanye nokuzinza okuhle kwesitoreji ngokumisa okwanele.

• Ifomu: ingakhiqizwa njengama-flakes, ama-granules noma impushana enosayizi wezinhlayiyana ezifanayo.
  Ukufaneleka komfula: ifanele izimayini (i-leaching), i-electroplating yezimboni kanye nezicelo eziningi zamakhemikhali amahle; ingadinga ukuhlanzwa okwengeziwe ukuze kusetshenziswe imithi.

3) Indlela yokuqhekeka kwamafutha alula

Isifinyezo senqubo: isebenzisa uwoyela okhanyayo oqhekekile noma amagesi omlilo njengokuphakelayo ukukhiqiza i-cyanide intermediates; ngokuvamile azinawo ama-catalyst kanye nokubekezela kokuphakelayo kwamazinga aphansi. Ukwelashwa kwegesi yomsila kuyinkimbinkimbi.
Ikhwalithi yomkhiqizo ejwayelekile:

• Uhlanzekile: maphakathi; kuncike ekuhlanzweni kwemifudlana eqhekekile.

• Izinsalela ze-Organic: izinsalela zezinto eziphilayo ezingenzeka kusukela ekuqhekekeni-kudinga ukugeza okuqinile nokuhlukaniswa.

• Isibabule: ngokuvamile iphansi uma i-feedstock is desulfurized; izimo ezithile zingangenisa izinhlobo zesibabule.

• Izinsimbi ezinzima: ngokuvamile aliphakeme kodwa lincike ekuphakeleni nasekusetshenzisweni.

• Umswakama / ukuzinza: iyalawuleka ngokomiswa ngendlela efanele, kodwa ukomiswa kabi kuholela ekwenzeni amakhekhe.

• Ifomu: impushana noma ama-granules anokusabalalisa usayizi wezinhlayiyana obanzi.
  Ukufaneleka komfula: esetshenziselwa kabanzi ukukhishwa kwezimayini kanye ne-electroplating evamile; ukuhlanzwa okwengeziwe okudingekayo ekusetshenzisweni kwamakhemikhali amahle azwelayo ku-organic.

4) Indlela ye-Methanol–ammoniation (inqubo ye-methanol–ammonia)

Isifinyezo senqubo: isebenzisa i-methanol ne-ammonia njengezitokwe zokudla eziyinhloko ukukhiqiza i-cyanide intermediate, ngokuvamile ngaphansi kwezimo ezikhuthazayo. Lo mzila wamukelwa kabanzi ngoba i-methanol iyisitoko esivuthiwe, esitholakala kabanzi. Inikeza ukusebenza kahle kokuguqulwa okuphezulu kanye nokusetshenziswa kwamandla okuphansi.
Ikhwalithi yomkhiqizo ejwayelekile:

• Uhlanzekile: ngokuvamile iphakeme futhi izinzile ngaphansi kokulawulwa kwenqubo efanele.

• Ukungcola okuphilayo: iphansi uma izigaba zokuhlukanisa nokugeza ziklanywe kahle.

• Isibabule: okuphansi (okuhlanzekile kwe-methanol/ammonia okuphakelayo).

• Izinsimbi ezinzima: iyalawuleka emazingeni aphansi ngokulawula impahla kanye nokudla.

• Umswakama / ukuzinza: umswakama ophansi kanye nezici ezinhle zokulwa ne-caking ngemva kokwelashwa okufanele emva kokwelashwa.

• Ifomu: ingakhiqiza ama-flakes ekhwalithi ephezulu noma ama-granules afanele ukudayiswa kwezohwebo.
  Ukufaneleka komfula: esebenza kakhulu - ihle kakhulu ekulethweni kwezimayini (ukululama okuphezulu), i-electroplating kanye nezicelo eziningi zamakhemikhali ezinhle; inketho yokuncintisana yezifunda ezinokunikezwa okuzinzile kwe-methanol/ammonia.

5) I-Acrylonitrile co-product (by-product) recovery

Isifinyezo senqubo: I-sodium cyanide ibuyiselwa njengomkhiqizo ohlangene ovela ezinqubweni zokukhiqiza i-acrylonitrile; lokhu kuyindlela yokonga uma ihlanganiswe nokukhiqizwa kwe-acrylonitrile.
Ikhwalithi yomkhiqizo ejwayelekile:

• Uhlanzekile: okusezingeni eliphezulu futhi ezinzile; inzuzo eyodwa enkulu ngokuvamile iphansi kakhulu isibabule.

• Ukungcola okuphilayo: iphansi ngenxa yezinhlelo ezimisiwe zokuhlukanisa/zokuthola kabusha.

• Isibabule: ngokuvamile iphansi kakhulu - inzuzo eyinhloko.

• Izinsimbi ezinzima: ngokuvamile iphansi kuye ngokulawula umfula.

• Umswakama / ukuzinza: kuhle - umswakama ophansi otholakala ngokucubungula okujwayelekile.

• Ifomu: izimo ezivamile zokuhweba ezifana nama-flakes noma ama-granules anokubukeka okukhangayo nokuzinza.
  Ukufaneleka komfula: ilungele kakhulu ukucwiliswa kwezimayini kanye nezicelo ezizwelayo kukungcola; umthamo wokukhiqiza, nokho, uncike ekusebenzeni kwesitshalo se-acrylonitrile futhi ngenxa yalokho uboshelwe ekutholakaleni komkhiqizo ngokubambisana.

Qaphela: izifinyezo ezingenhla zekhwalithi yomkhiqizo ziyizinga eliphezulu lokujwayelekile komkhakha. Amamethrikhi ekhwalithi yangempela ancike kukhwalithi ye-feedstock, ukulawula inqubo kanye nezinyathelo zokuhlanzwa komfula/ukomisa/zokupakisha. Ngokucaciswa noma ukuthengwa kwempahla, hlala udinga Isitifiketi Sokuhlaziya (COA).

3. Amamethrikhi ekhwalithi engukhiye nokuthi athinta kanjani ukusetshenziswa komfula

Lawa amaqembu okuthola izichasiso zekhwalithi evamile futhi abasebenzisi bokugcina kufanele babeke phambili futhi bahlole kuma-COA:

• Okuqukethwe kwe-NaCN (% w/w): inquma umthamo osebenzayo we-cyanide nokusebenza kwe-leaching.

• I-cyanide yamahhala / i-cyanide encibilikayo: kuthinta ukusebenza kabusha nokubamba ukuphepha.

• Okuqukethwe umswakama (%): kuthinta ukuqina kwesitoreji kanye nokuthunyelwa (umswakama ophezulu → ukupheka).

• I-alkali encibilikayo (isb., NaOH) / i-alkalinity yamahhala: ishintsha i-pH yesisombululo futhi ingaba nomthelela kumakhemikhali wokuvuza.

• Izinhlobo zesibabule / sulfate / chloride: ukungcola okuthile kuthinta kabi ama-syntheses azwelayo.

• Izinsalela ze-Organic: i-organics ingadla i-cyanide ngokusabela okuseceleni, inciphise ukutholakala kwe-cyan okusebenzayo kokucwiliswa.

• Izinsimbi ezinzima (Pb, Hg, Cd, njll.): okubalulekile ekusetshenzisweni kwemithi/amakhemikhali okuhle nokuhambisana nemvelo.

• Usayizi wezinhlayiya kanye nefomu (i-flake / pellet / powder): kunomthelela izinga lokuchithwa, ukusebenziseka kalula kwemithamo nokuziphatha kwezokuthutha.

Izibonelo zemithelela engezansi:

• I-Gold Leaching: ikhetha i-NaCN ephezulu, i-organics ephansi kanye ne-alkalinity elawulwayo ukuze ilulame kahle.

• I-Electroplating: izwela isibabule nezinsimbi ezinzima; iyunifomu, i-cyanide ehlanzekile ikhethwa.

• I-Pharma/amakhemikhali amahle: idinga imikhawulo eqinile ye-heavy-metal kanye ne-organic ukungcola - ngokuvamile idinga ukuhlanzwa okwengeziwe.

4. Ithebula lokuqhathanisa lekhwalithi ephezulu

Ithebula ireferensi yemboni ejwayelekile. Ngaso sonke isikhathi qinisekisa i-COA yomkhiqizo futhi wenze izivivinyo ezikusayithi zezinhlelo zokusebenza ezibucayi.

5. Ukuqhathanisa kwenqubo — ubukhulu obuyinhloko (isifinyezo)

• Umkhondo / ukukhishwa kwemvelo: ukuhlanganisa/ukuncibilikisa > ukuqhekeka kwamafutha alula / Indlela ka-An > i-methanol–ammoniation ≈ i-acrylonitrile co-product (">" isho “umthwalo wemvelo omkhulu”).

• Ukusetshenziswa kwamandla nezindleko zokusebenza: ukuhlanganisa kanye nokuqhekeka kwamafutha alula kuvame ukuba namandla kakhulu; Ukukhiqizwa ngokubambisana kwe-methanol–ammoniation kanye ne-acrylonitrile ngokuvamile kubonisa izinzuzo zezindleko lapho isitoko sinenani elihle.

• Ukuvumelana nezimo kokukhiqiza: I-methanol–ammoniation kanye nendlela ka-An inikeza ukulawula okungcono okuzimele komthamo wokukhiqiza; co-product (acrylonitrile recovery) iboshelwe ekuphumeni kwesitshalo se-acrylonitrile.

• Ukuphepha nokuzenzakalela: I-An ne-methanol–ammoniation iyathandeka kakhulu uma iqhathaniswa nokusebenza kwezinga lokushisa eliphansi kanye ne-automation ephezulu; ukuqhekeka nokuhlanganiswa kukawoyela okhanyayo kudinga igesi yomsila eqinile kanye nezilawuli zokuphepha ezisezingeni eliphezulu.

6. Uchungechunge lwenani lemboni (enhla nomfula — phakathi nomfula — phansi komfula)

I-Upstream — izinto zokusetshenziswa nemishini

• Izinto zokusetshenziswa eziyinhloko: i-soda ash (Na₂CO₃), i-ammonia ye-liquid (NH₃), i-methanol (CH₃OH), i-urea, izixazululo ze-caustic, uwoyela okhanyayo nokunye kuye ngokukhetha kwenqubo.

• Amathuluzi amakhulu namasevisi: ama-reactors, amayunithi okukhipha i-distillation kanye nokuhlukanisa, amathangi okugcina, amasistimu okwelapha igesi eliwumsila, amasistimu okuqapha nokuphepha, kanye nosonkontileka be-EPC (ubunjiniyela, ukuthenga nokwakha) nabahlinzeki bempahla.

• Abahlanganyeli: abahlinzeki be-feedstock (i-methanol, i-ammonia, izicwengisisi), abakhiqizi bemishini, abakhi bama-catalyst, amafemu onjiniyela.

I-Midstream - ukukhiqizwa, ukulawulwa kwekhwalithi nokuhweba

• Imisebenzi: ukukhiqiza (izindlela ezihlukene zenqubo), ukugreda nokufakwa kwemikhiqizo (amaflakisi, ama-pellets, izimpushana; izinto ezijwayelekile zokuhweba ezifana nama-98% we-NaCN), ukuhlolwa nezitifiketi ezivela eceleni, ukusatshalaliswa kanye nohwebo lwamazwe ngamazwe.

• Ukukhathazeka Okubalulekile: amanani entengo yezinto ezingavuthiwe, ukuthobela imvelo, ukulungela izimo eziphuthumayo, ukupakishwa kwempahla eyingozi kanye nokuhanjiswa.

I-downstream — qeda ukusetshenziswa namakhasimende

• Izimakethe zokugcina ezinkulu: i-metal leaching (igolide nezinye izinsimbi eziyigugu - ukusetshenziswa kwevolumu enkulu kakhulu), i-electroplating, i-pharmaceutical intermediates kanye namakhemikhali amahle, i-agrochemical synthesis, izithasiselo ze-flotation kanye nama-reagents aselabhorethri.

• Izimfuneko zekhasimende: amazinga aphezulu okuthembeka kokuhlinzeka, ikhwalithi engaguquki kanye nokuphathwa kwempahla eyingozi; amaphrojekthi ezimayini ikakhulukazi adinga isikhathi esibikezelwayo kanye nemibhalo.

7. Uhwebo lwamazwe ngamazwe kanye nezimo zokuthekelisa ngaphandle (isifinyezo semboni)

• I-trajectory iyonke: selokhu kwavuleka umnotho waseShayina, izwe selishintshile lisuka ekubeni ngumthengi we-sodium-cyanide kwamanye amazwe laya kwelinye labakhiqizi nabathumela kwamanye amazwe abakhulu kakhulu emhlabeni. Ukuthunyelwa kwamanye amazwe eLatin America, e-Afrika, e-Oceania, e-Asia Ephakathi naseNingizimu-mpumalanga ye-Asia kukhule eminyakeni yamuva. Ukuphazamiseka ekukhiqizweni phesheya kwezilwandle (isb, imiphumela yenkathi yobhubhane) kuvame ukukhuphula isidingo sabahlinzeki baseShayina.

• Idatha emele: ngo-2024, ukuthunyelwa ngaphandle kwe-sodium cyanide yaseChina cishe Amathani angama-216,000 (21.6 ×10⁴ t), phezulu 12.03% unyaka nonyaka, ngevelu yokuthekelisa nxazonke USD 454 wezigidi, phezulu 1.34% unyaka nonyaka.

• Izindawo okuyiwa kuzo ezinkulu: I-Afrika, iNingizimu Melika, iRussia, iNtshonalanga ye-Asia naseNingizimu-mpumalanga ye-Asia. Amazwe anjengeRussia, iPeru, iZimbabwe, iMexico, iNiger, iTurkey kanye neBurkina Faso ehlangene abalelwa ku- 57.15% yokuthekelisa, nezinye izifunda zabelane ngokusele.

• Abashayeli bemakethe: ukwanda kwezimayini zegolide, ukukhula kwezimboni ze-agrochemical/fine-chemical phesheya kanye nezindleko ezilinganiselwe kanye nezinzuzo zamandla zabakhiqizi baseShayina.

• Izingozi zohwebo: Imithetho yokuthutha impahla eyingozi, izidingo zemvelo noma ukuphepha kwezwe okuyiwa kulo, ukuphazamiseka kwezwe nelokusebenza, uhlobo lwemali kanye nezingozi zokukhokha.

8. Izingozi zemboni, izinto eziza kuqala ukuthobela imithetho nezincomo zamabhizinisi

1. Beka kuqala ukuphepha nendawo ezungezile: ukutshala imali ekuhlanzeni igesi yomsila kanye namanzi angcolile, ukutholwa kokuvuza, impendulo ephuthumayo kanye nokuxhumana nomphakathi ukuze kuncishiswe ingozi nengozi yokulawula.

2. Vikela ukunikezwa kwezinto ezingavuthiwe: ukusungula izinkontileka zesikhathi eside noma ubudlelwano bamasu ne-methanol, i-ammonia nabanye abahlinzeki ababalulekile ukuze kuzinziswe izindleko nokuhlinzeka.

3. Khetha inqubo ngokwemibandela yendawo: khetha imizila yokukhiqiza ngokusekelwe ekutholakaleni kwe-feedstock, izindleko zamandla, ukuqina kokulawulwa kwemvelo kanye nekhwalithi yomkhiqizo oyifunayo.

4. Diversify izimakethe namasevisi: ukwandisa izimakethe ezingezansi (isb., i-agrochemical intermediate, i-electroplating, ama-lab reagent) futhi unikeze ukusekelwa kobuchwepheshe, ukuqeqeshwa kokuphepha endaweni kanye nezinsizakalo zokuthutha eziyingozi ukuze kwandiswe ukugcinwa kwamakhasimende.

5. Ukuqinisekisa ikhwalithi: zidinga Izitifiketi Zokuhlaziya, ukulandeleka kwenqwaba kanye nozakwethu namalebhu agunyaziwe; ngezicelo ze-high-spec zinikeza ukuhlanzeka okwengeziwe noma iziqinisekiso ze-QC ze-bespoke.

6. Thumela ukuthobela: ukuqapha ngokucophelela ezokuthutha zamazwe ngamazwe & yokungenisa imithetho ye ama-cyanides futhi usebenzise amadokhumenti aqinile, ukupakisha kanye nokuhlolwa kwenkampani yenethiwekhi ukuze kugwenywe ukubambezeleka kokuthunyelwa noma ukwenqatshwa.

Isiphetho - United Chemicalukuzibophezela

United Chemical uyakubona lokho ukukhiqizwa kwe-sodium cyanide futhi uhwebo aluthwali nje kuphela inani lezentengiselwano kodwa futhi lunesibopho esikhulu. Sizibophezela ku-:

• ukwamukela imizila yokukhiqiza ehlanzekile, ezinzile kanye nokwenza ngcono ukusebenza kahle kwamandla kanye nokulawula ukungcola;

• ukuphoqelela ukuhlolwa kwekhwalithi okuqinile, ukuphathwa kwempahla eyingozi kanye nemibhalo yamakhasimende;

• enikeza ukwakheka okuhambisanayo, ukwesekwa kobuchwepheshe kanye neziqondiso zokuthobelana kozakwethu bomhlaba;

• ukuqinisekisa amaketanga okuhlinzeka okuthembekile ngenkathi kugcizelelwa ukuphepha kanye nokuphathwa kwemvelo.

Ngemibuzo mayelana nokucaciswa, ama-COA, ukupakishwa kanye nemibhalo yokulawula, noma ukucela ukwesekwa kobuchwepheshe nokuqeqeshwa ukuphatha ngokuphepha, sicela uthinte United Chemical ngewebhusayithi yethu esemthethweni noma amahhovisi okuthengisa esifunda. United Chemical sibheke ngabomvu ukusebenzisana namakhasimende omhlaba wonke ezimayini namakhemikhali ezixazululweni zokuhlinzeka eziphephile, ezithobelayo nezisezingeni eliphezulu.