ʻO Ferro Silicon a me Calcium: Hoʻohana nui i nā pono a me nā noi 

ʻO Ferro silicon a me ka calcium—ʻelua mau mea pili i ka poʻomanaʻo i ka nūhou hana kila akā hana mālie i kēlā me kēia tona o ke kila kila kiʻekiʻe, paipu hao ductile, a i ʻole nā ​​mea hoʻolei kaʻa e holo ana i nā laina hana hou. Ma Inner Mongolia Xinxin Silicon Industry Co., Ltd., ua hoʻolako mākou i nā mea ʻelua no nā makahiki he 14-ʻaʻole like me nā mea kūʻai kaʻawale, akā ma ke ʻano he mau hoa hana pololei i ka mana metallurgical. ʻAʻole "deoxidize" wale ka Ferro silicon a me ka calcium. Hoʻonohonoho lākou i ka wehe ʻana i ka oxygen, nucleate graphite spheroids, hoʻopaʻa i nā kaula manganese sulfide, a laka i ka sulfur i loko o ka paʻa, hoʻokomo honua. ʻO ia ke kumu e nīnau ʻole ai ka poʻe kūʻai ma Shandong, Hebei, a me Vietnam *inā pono lākou iā lākou—e nīnau lākou *ʻo ke ʻano o ka ratio, *he aha ka nui o nā ʻāpana*, a me *pehea ka wikiwiki e hiki ai iā ʻoe ke hōʻoia i ke ʻano like ʻole?*

No ke aha e hana maikaʻi ai ka ferro silicon a me ka calcium ma mua o ka kaʻawale

Hoʻopau ka ferrosilicon kūʻokoʻa (FeSi) i ka oxygen-akā e waiho ana ma hope o ke koena sulfur a me ka morphology hoʻopili ʻole. ʻO ka calcium wale nō e mahu me ka wikiwiki i ke kila hoʻoheheʻe ʻia, e hāʻawi ana i ka hoʻihoʻi maikaʻi ʻole a me ka hāʻawi like ʻole. E hoʻohui iā lākou e like me ka calcium silicide (CaSi) a i ʻole silicon-barium-calcium alloy—a loaʻa iā ʻoe ke kūpaʻa wela, nā kinetics hoʻokuʻu ʻia, a me ka desulfurization synergistic. I loko o kā mākou mea kanu, ua hoʻohui ʻia ʻo CaSi i ka 0.8-1.2 kg/ton i hōʻemi ʻia ka nui o ka oxygen mai 32 ppm a i 18 ppm * a ʻoki ʻia ka ʻike sulfur e 37% me nā lāʻau FeSi-wale. ʻO ke kī? Hoʻololi ka calcium i nā hoʻokomo alumina; hoʻomau ke silika i ka lewa hoʻohaʻahaʻa. ʻAʻole hana maikaʻi kekahi me ka ʻole o kekahi.

ʻIke mākou i kēia i kēlā me kēia lā i ka manaʻo o ka poʻe kūʻai: Ua hoʻololi ʻia kahi mea hoʻokumu ʻo Tier-1 ma Tangshan mai ka uea FeSi + CaAl i ka Si-Ba-Ca i hoʻohui mua ʻia ma hope o ka hāʻule ʻana o ka nodularity i nā pahu hao ductile 40-mm. Ua lele ko lākou hua mai 71% a i 94% i loko o ʻelua pule. No ke aha mai? ʻO ka helu heheʻe haʻahaʻa o ka calcium silicide (985°C vs. 1,260°C no ka Ca maʻemaʻe) hiki iā ia ke hoʻoheheʻe piha ma mua o ka hoʻoheheʻe ʻana. Hoʻopaʻa ʻia kāna ʻike silika i ka reoxidation i ka wā paʻi. ʻAʻole ia ka manaʻo—ʻo ia ka 237 mau wela me ka nodularity>85% ma ka ASTM A536 Papa 65-45-12.

ʻEkolu mau noi honua maoli kahi e hana ai ka ferro silicon a me ka calcium i ka hana

• ʻO ka hoʻoheheʻe ʻana i ka hao: Kāleka silicide (maʻamau 30–33% Ca, 58–62% Si) nucleates Type I graphite spheroids ma 1,420–1,450°C. Ca liʻiliʻi loa → flake graphite; nui loa → ka lepo calcium oxide. ʻO kā mākou CaSi-30 maʻamau e hālāwai me GB / T 20935.1–2018 a paʻa i ka ± 0.8% ka hoʻomanawanui ma ka ʻike Ca-koʻikoʻi inā ʻo 0.12% o ka paona hoʻoheheʻe inoculant.
• ʻO ka hoʻomaʻemaʻe kila lua: I loko o ka RH degassers, ʻoi aku ka maikaʻi o nā huila Si-Ba-Ca i nā hui FeSi + CaF₂. Hoʻohaʻahaʻa ka Barium i ka haʻalulu o ka ʻili; hoʻoponopono ka calcium i ka sulfur; pale ka silikoni i ka hoʻohāhā ʻana. Ua hōʻemi kekahi mea kūʻai aku i ka hoʻohana argon ma 22% ma hope o ka hoʻololi ʻana—no ka mea, ua wikiwiki ka hoʻokomo ʻana me ka ʻole o ka nui o ka slag.
• ʻO ka hānai ʻana i ka uea i hoʻopaʻa ʻia no nā mea hoʻoheheʻe paʻa lahilahi: Maʻaneʻi, ʻoi aku ka nui o ka nui o nā ʻāpana ma mua o ka haku mele ʻana. Hoʻopili mākou iā CaSi iā D₅₀ = 0.85 mm—ʻoi loa ka paʻa no ka hānai ʻana i ka uea paʻa ma 280 m/min. Hōʻike nā mea kūʻai i ka 92% calcium recovery vs. 68% me nā pauka sub-0.3-mm.

He aha nā mea kūʻai e nānā aku ai - a uku no ka hope

Manaʻo kekahi poʻe he mea hoʻololi nā ferro silicon a me nā huahana calcium. ʻAʻole lākou. Ua hoʻāʻo mākou i 17 mau pahu CaSi i lawe ʻia mai nā ʻāina ʻekolu: 4 i hāʻule i ka kānana kānana (ʻoi aku ka uku), 6 hōʻike i ka hoʻokaʻawale ʻana o Ca ma nā ʻāpana keʻa, a ʻo 3 i loaʻa > 0.15% phosphorus- lawa e hoʻoheheʻe i nā kila haʻahaʻa. Ka hopena honua maoli? Ua ʻoki ʻia e kahi wili paipu ma Jiangsu he 112 tons o ka API 5L X65 ma hope o ka haki ʻana i ka hydrogen-induced - i ʻike ʻia i CaSi waiwai nui o ka phosphorus i hala i kā lākou QC e komo mai ana.

ʻO ia ke kumu o kā mākou hōʻoia maikaʻi ʻaʻole he pepa-ʻo ia ka physics. Loaʻa nā ʻāpana āpau i ka loiloi OES (Spectro MAXx), ka nui o ka diffraction laser (Malvern Mastersizer 3000), a me ka microscopy wela wela e hōʻoia i ka hana hoʻoheheʻe ʻana ma 1,480°C. Hoʻopaʻa mākou i kēlā me kēia hopena hoʻāʻo - ʻaʻole i hala / hāʻule wale. Inā koi kāu palapala noi <0.02% Al a i ʻole <0.005% S, e kaʻana like mākou i ka faila spectra maka. ʻAʻohe mea hoʻonani kūʻai. ʻIke wale nō hiki iā ʻoe ke hānai i kāu Melt Shop MES.

Hoʻomaka ke koho ʻana i ka huahana kūpono me kāu umu—ʻaʻole kā mākou papa inoa

E nīnau iā ʻoe iho i ʻekolu mau nīnau ma mua o ke kauoha ʻana:

1. He aha kāu ʻike wela ladle? Ma lalo o 1,400°C? E koho iā CaSi-28 (kahi hoʻoheheʻe haʻahaʻa). Ma luna o 1,480°C? E hele i ka CaSi-33 no ka hoʻoheheʻe lohi a me ke komo hohonu.
2. He aha kāu pahuhopu sulfur? >0.020%? E hoʻokumu i ka Si-Ba-Ca (Hoʻonui ka Ba i ka mana sulfide). <0.008%? E hoʻohana i ka uea CaSi + MgFe no ka hoʻoliʻi hope ʻana.
3. Pehea ka paʻa o kāu puka hoʻouna? ʻO kā mākou manawa alakaʻi maʻamau he 7 mau lā FOB Tianjin. No nā kauoha ulia pōpilikia ma lalo o 48 mau hola, paʻa mākou i ka 120 MT o CaSi-30 i loko o kahi waihona hale kūʻai paʻa - hoʻāʻo mua ʻia, paʻa mua, mākaukau no ka hoʻouka ʻana i ka ipu.

ʻAʻole mea hoʻohui ka Ferro silicon a me ka calcium. He mau lever metallurgical lākou - pololei, hiki ʻole ke hoʻololi ʻia, a hiki ʻole ke kūkākūkā ʻia i nā noi kiʻekiʻe. Ma Inner Mongolia Xinxin Silicon Industry Co., Ltd., hana mākou iā lākou pēlā: ʻaʻohe kumu kūʻai, ʻaʻohe kikoʻī maʻamau, ʻaʻohe manaʻo. Hoʻopili wale ʻia nā alloys i kāu kemika, kāu mea hana, a me kāu hui ʻōpala. No ka mea, ke pi'i kou wela a'e i 1,430°C, 'o ka mea nui 'a'ole ka lepili ma ka 'eke—'o ia ka ho'ohehe'e 'ana o ka calcium *ma mua o ka ho'okumu 'ana o ka slag, a inā paha e ho'oikaika 'ia ke silikoni ma hope o ka 'ōhū 'ana o ka argon.