Inkampani Yomthetho: Indlela Ukubopheleka Kwemithetho Ye-VOC Ikhubaza Ekuthwebuleni Kwemikhumbi Yezici

Izilinganiso ze-EPA NESHAP ne-EU REACH ezibiza ukulawula kumasebenzi okuciphisa amava

Ukukhululwa kwe-Volatile Organic Compounds (VOCs) ngesikhathi sokwakha izinkulungwane ze-resin ephambene ne-diamond kuthathwa ngcono kakhulu ku-United States ngaphansi kwezinhlobo zokushisa kwe-EPA ezizenzakalo eziphathelene nezimali eziphazanyayo (NESHAP) futhi kuzo zonke iZakhenke ngaphansi kwezibophelo, ukubhalisa, ukufaka, ukuvikela nokulawula izinto ezinzima ezibizwa ngama-REACH. Izindawo ezisetshenzisana nokuphefumula okunxibenyayo lapho izinkimbini zihamba phakathi kwama-120 nama-220 degrees Celsius ukuze zilungise izinkulungwane zomlando kufanele zilandele lezo zindlela uma izindleko zabo ze-VOC ngonyaka ziyagcina ama-10 tons e-Amerika noma zifinyelela amakhweyiphuzu abekwe ngu-REACH ngokusho kwezinkinga ezithile ezivelwa kusuku lwe-2023. Uma izindawo zifaka kuleso sigaba, zidingeka ukufaka izixhobo zokuphatha ukushisa njenge-thermal oxidizers noma izivikelophu zokujikeleza ukuze zimthinthe izinkimbili ezinxitya emifuleni ngaphambi kokuthi zihlule emifuleni. Isizathu esemva kwaleso siqaleko sikhuluma futhi, ngoba ukuphefumula izinto kulezi zinkimbili kakhulu kuyakhula ukudala i-VOCs, lokhu kusho ukuthi ukubamba iqhaza kuphela kufanele kube khona hhayi kuphela ukuhlala kwiindlela eziphethwe yilawu kodwa futhi ukuze kuthintwe konke okungaphezu komali noma konke okungaphezu kwebala elizayo.

Ulolwazi lwe-disc resin-bonded ekugcinwa njenge 'ukusebenzisa i-coating kanye ne-adhesive' ngaphansi kwezimiso ze-VOC emissions

I-EPA yaseMelika ngokwesivumelwano ne-ECHA eEurope kuyathatha izinkulungwane zodidi lwedisc yesiliconi ehlobene ngezibindi njengenkulumo yamacala futhi njengamanje kuzindlela zokuphaza okuqukethwe kwi-VOC. Lokhu kulingana nokuthi kuchazwe ku-Clean Air Act ngamagama amacala. Undima wale ngxenye kukhona ekugcineni indlela lezinkulungwane ezinezinto eziphinde zibandakanya izidili zokubanda emanzini zenzela ukudluliswa kwemali emanzini emanzini kuzintamo zomthwalo noma kuzingxenye zezinhlekele. Lezi zinto zihlengeka ngendlela efana naleyo ethinta izicelo sezinhlangothi zokusebenza kakhulu uma kushisa. Uma kushiswa, izinkulungwane ephathelene nomfanekiso noma ezingenakuqhubi kizinyanga zizohlaba futhi zithumele i-compounds ze-organic volatile njenge-formaldehyde, i-glycidyl ethers, nase-N methyl 2 pyrrolidone, ezaziwayo ngokuthi yi-NMP. Ngoba kule miphumela, abasebenzisi basebhange bayadinga ukususa izinyathelo ezithile. Kufanele bafake izinhlelo eziphepha kahle kakhulu zokuvuselela umoya, bantwaze izinkulungwane eziphazanyayo kuma-VOC noma ezingenakuqhubi kabonke uma kudingeka, bahlale banakekela amabhuku abalulekile mayelana nobuhlukahluka bebandla ngokulandela ii-guidelines ze-OSHA nezimo zokuphepha kwe-European Union.

Umbango Wesimo: I-Chemistry Ye-Resin Nokuphila Kwayo Okuthintelayo Kukhupha i-VOC

Imithetho yokukhupha i-VOC: ukusabalalisa komthwalo wokucindezela kunokuphila kwayo (okuphile kakhulu) kwi-120–220°C

Kwakhiwa kwezinkundla zediamond, izimo ezihlukene (VOC) ezingavimbiyo ziyase kuqashelwa kusuka kumelemini amabili: xa i-solvents ivalela ngokuqala, kanti emva kwalokho nge-thermal decomposition noma pyrolysis. Izinto ze-solvent zazange ziphucule kude ngokushesha ekuphindiseni kwemfazwe, kodwa ziguquka lapho ubudlebole buhlanga kusuka ku-120 ukuya ku-220 degrees Celsius, okubaluleke kakhulu ibanga elijwayelekile lempilo apho i-resins qala ukuxhumana. Ngalesi simo esikhulu, izikhangeli ze-polymer zivalela ngokwaneleyo, zibeka izinto ezihlukile njenge-benzene, acrolein, ne-formaldehyde kumoya. Ize imbono yekholekhesi yethu lithi le ndlela ye-pyrolysis ibika ama-VOC ayingu-3 ukuya ku-5 ngaphezulu kungeya kusalwa ngu-solvent kuphela ngalunye uhlu lwe-resin olusebenziswa. Lokhu kuchaza kungani izikhululo kumele kube ne-thermal oxidizers endaweni yokulunga ngokuphelele kwezinyathelo zothelelo uma zifuna ukulindela izinhambuzo zomphakathi.

Ukwekwezi kwesithuthi: i-phenolic (formaldehyde), epoxy (glycidyl ethers), kanye ne-polyimide (NMP) njengamaphethini akhethekile okuvutha VOC

Ichemikhali yesithuthi isikela umfanekiso wokuvutha nokuhlelo lwemfundo yokulawula:

I-Phenolic resins—ezisetshenziswa ku-65% kwebala lezimali ze-diamond—ziyaletha indiza enkulu ye-formaldehyde ngexesha lokucwalisa. Isetyenziso sabo esikhulu sikhuthaza ukuba kube yindlela ekhombisa ukuthembekile nokulungiswa kwizinto eziphathelene ne-abrasives industry.

Ukuthintana Kumele: Ubuhle, Ukuphepha, nokuthintana kwezimali kwegunya elingavikelekanga le-VOC

Imithwalo yesempilo yokusebenza—ukuthi benzene, acrolein, no-formaldehyde kuzindawo zokwenza i-grinding wheel

Ukuphuma kwe-VOC okungaphathwayi kuthinta ngokugcwele nokuphakama izindlela zokusebenza kubasebenzi ekwakhiweni kwemikhumbi yediamond. Ukuchazwa kuka NIOSH (2023) ukuthi ukuthintana nge-formaldehyde kuphela kuthintana nokukhathala kokuhlanya kubantu abanguqu 23% basebenzayo emvelaphi yezibambo. Ukuciphisa ngqo kusungulwa amathambo amathathu aphepha ebomu elihlaza:

• Benzene , yindoda ebalulekile yokudla (IARC Group 1), enxanyene ne-leukemia;
• Acrolein , indawo ephakeme yokuhlanya eyenza ukuthintana kwegazi lesiphithiphithi kanye nokulahlekelwa kwebumba ngemithwalo engaphansi;
• Formaldehyde , enxanyene nokwandiswa komkhumbi wenhloso kanye nokuthintana ngokuziphatha.

Ukuthintana ngokudla kuxhumanisa nokunyuka kwe-40% kokuqashwa kwe-asthma esizweni kanye nokufa kwesimo sokufunda—kuthintana nokulinganiso kwe-OSHA kwezimali ezivumelekile (PELs) kanye ne-EU Directive 2017/164/EU mayelana nobomi bokudla kanye nobomi bokuthembeka.

Ukuphela kwezivimba kanye nokuthintana nokulinganiso kwebalekileli kubomi bomoya obungaphandle kubangela ukusebenzisa izinhambuzo zolawulo

Ukungasebenzi kweziventilasi noma ukuphila kwakhe okubi ngexesha lokuchazela kwe-thermal kwenza imiphumela emangalisayo yomoya phakathi—neemeko ezilawulo zokuphucula. Xa iindawo zokuphuma kwindawo noma iindawo zobunzima bokuphanda babuyile:

1. Iingcambu ze-VOC phakathi kwindawo ziqhubeka ziyekwa ngaphezulu kwezilinganiso ze-EPA ngama-8–12%, zibizela ingxaki ekufuneka ibazwe ngayo ngaphantsi kwe-40 CFR Part 63;
2. Ukudilika kwemithetho yokulinganisa umoya wodwa kunokubangela amabhente angama-$37,500 ngexesha ngexesha ngaphansi kwe-Clean Air Act;
3. Ukungafani okuphindaphindi kuthintela ukuphela kwemisebenzi xa iziko zihlala ziya kwiimfuno zezinxalenye ezingaphandle;

Umbuzo othile wokulawula kwe-EPA ngo-2022 uwabonisa ukuba abantu abangu-78% basebenzisana nezixhobo zokukhula nezixhobo ezimbini eziphambene ne-VOC babephila njengoko babehlala nazo okanye babeyikrele ukuguqula indlela yobuchwepheshe—baxabisa kuthi ngaba ntoni iindlela ezimelezelayo zokunjalo neemfundo ephinde-phinde zisondele ayizizo kuphela kodwa na iindlela ezimelezelayo zokuphatha imisebenzi.

Imibuzo Evame Ukubuzwa

Ziziphi i-volatile organic compounds (VOCs)?

Izinkinga zokubutha kakhulu zizinkinga eziphazanyisayo ezinamandla okuphazanya okuphakeme futhi zingasebenze njengemiphumela yomnyango wamahubo uma zilayishwa emlonyeni.

Thermal curing iyiphi?

Ukugcina ngokwesibindi kuyindlela ekwenziwa ngayo izikhumba ze-diamond ezigcinwe ngaphandle ngokudweba i-diamonds eziphazanyisayo kusayizi ngamandla aphezulu ukusetha izinto.

Kungani ukulawula VOC kumele kubaluleke kakhulu ekwakheni kwezikhumba ze-diamond?

Ukulawula kuka-VOC kumele kube balulekile ngokusho kwemiphumela engcono noma engavumelekile kuhlanya nokuzimisele. Izindlela zokwakha ephathelene ne-VOC kudinga ukulandela izinhukumbuzo njenge-NESHAP ye-EPA futhi REACH ye-EU ukuze kugunyaziwe imiphumela engavumelekile.

Yiziphi iziphumo ezidingekayo ukuqhamuka kokulawula?

Amathuba angadinga ukufaka izinqumo zokulawula imiphumela njengezokugaya kwezibindi noma izivivinyo zokuguquguquka ukuhlela imiphumela ye-VOC ngduring production processes.