Thaum lub sij hawm smelting txheej txheem ntawm txhuas rods, aluminium kua yuav tsum tau hloov. Kev hloov kho kho yog ua ua ntej refining. Ua ntej cov kua txhuas hloov pauv los ntawm lub qhov cub melting mus rau lub ladle hloov, ib qho kev hloov kho tau ntxiv rau hauv qab ntawm lub qhov cub hauv daim ntawv ntawm cov hlau. Hloov cov ntsiab lus tsis ncaj qha ntxiv. Aluminium strontium alloy rods feem ntau yog siv los hloov kho. Sr yog lub sijhawm ua haujlwm ntev, thiab lub sijhawm hloov kho tuaj yeem kav li 6 mus rau 8 teev, uas ua kom cov ntxhib flake silicon rau hauv cov qauv zoo thiab ntxiv dag zog rau cov khoom siv kho tshuab. Qhov kev hloov kho no zoo dua li muab tso rau hauv qhov cub smelting, thiab tuaj yeem txo qhov kub hnyiab thiab lwj. Tom qab Sr melted nyob rau hauv qab ntawm lub cub tawg, siv rotational degassing mus do tusyees kom txo tau segregation. Tom qab Sr tau deteriorated, aluminium kua absorbs hydrogen sai sai thiab tsim ntau pinholes. Lub sijhawm nyob tom qab kev kho kom zoo yuav tsis ntev dhau. Yog tias nws dhau 1 teev, yuav tsum tau kuaj hydrogen tshiab. siv tau. Tom qab cov kua txhuas tau xa mus rau lub ladle hloov, tus neeg sawv cev ntxuav slag yog nplawm thiab nplawm kom tob kom tshem tawm cov tshauv slag. Ntsuas seb qhov kub ntawm cov kua txhuas tuaj yeem ncav cuag qhov kub thiab txias. Yog tias qhov kub thiab txias dhau lawm, cov ntaub ntawv rov qab yuav tsum tau muab ntxiv kom txias. Yog tias qhov ntsuas kub qis, lub zog yuav tsum tau qhib kom nce qhov kub. Lub refining kub yog tswj ntawm 720 ~ 740 degree. Sprinkle ib qho me me ntawm slag tu tus neeg sawv cev ntawm qhov chaw kom txog thaum kev hloov kho tsim nyog. Degassing refining feem ntau suav nrog degassing thiab tshem tawm hydrogen. Txij li feem ntau ntawm cov slag inclusions tau raug tshem tawm los ntawm kev sib sib zog nqus nplawm thawj zaug, tseem muaj ib qho me me ntawm txhuas slag sab hauv, yog li lub sij hawm thib ob txau ntxiv me me ntawm tus neeg saib xyuas tu.
Cov kev siv feem ntau ntawm degassing rotary refining yog degassing refining thiab hmoov txau refining. Lub hauv paus ntsiab lus yog kom dhau inert gas los yog refining tus neeg sawv cev rau hauv lub cub tawg hauv qab. Lub refining tus neeg sawv cev yog lub teeb heev. Lub inert gas los yog refining tus neeg sawv cev yog ejected los ntawm lub cub tawg hauv qab thiab pib nce. Cov txheej txheem nce qib coj Tshem tawm cov hydrogen thiab cov khib nyiab hauv cov kua txhuas kom ua tiav lub hom phiaj ntawm purifying cov kua txhuas. Lub tshuab degassing siv hauv degassing refining tsav lub flange los ntawm lub cev muaj zog, thiab lub flange txuas thiab tig nrog lub graphite rotor. General graphite rotors muaj lub neej ua haujlwm luv luv thiab ua rau corrosion thiab tawg. Nyob rau hauv no hais txog, lub graphite rotor yog immersed nyob rau hauv ib tug nruab nrab nyob rau hauv qhov kub thiab txias siab, thiab ces sintered thiab solidified los txhim kho nws cov kev pab cuam lub neej. Hom graphite no feem ntau yog imported thiab tus nqi siab.
Cov nyhuv refining ntawm rotating hmoov txau yog zoo dua, tab sis nws yog ib qho yooj yim los thaiv cov graphite rotor. Hauv ntau lawm, qhuav inert gas los yog high-purity nitrogen feem ntau yog siv rau refining. Cov roj txuas nrog lub flange, thiab lub flange pib tig nyob rau hauv lub tsav ntawm lub cev muaj zog, thiab lub graphite rotor Raws li lub flange rotates ua ke, qhov kev sib hloov ceev yog 400-600 r / min, qhov ntws ntawm inert gas (argon) tswj ntawm 15-25 L/min, nitrogen gas yog 20-40 L/min, thiab siab yog (0.4±0.1) MPa . Thaum lub sijhawm ua haujlwm, thawj zaug qhib lub roj valve, tom qab ntawd maj mam txo lub degasser kom txog thaum qhov kev ncua deb ntawm lub graphite rotor ntawm lub degasser thiab hauv qab ntawm lub ladle hloov yog 100 mus rau 150 hli. Thaum kawg, tig rau lub cev muaj zog thiab pib degassing thiab refining. Lub sij hawm refining yog 10 mus rau 20 feeb. . Txhawm rau tiv thaiv cov kua txhuas los ntawm vortexing vim qhov kev sib hloov ceev ntawm cov graphite rotor, baffles muab tso rau ntawm ib lossis ob sab ntawm lub graphite rotor kom txo tau qhov turbulence ntawm txhuas kua thaum lub sij hawm kev sib hloov. Thaum degassing lub graphite rotor, xyuas kom meej tias cov npuas yog me me, dispersed heev, thiab zoo. Qhov no tuaj yeem tsis tsuas yog ua kom cov nyhuv degassing, tab sis kuj tiv thaiv cov npuas los ntawm bursting oxide zaj duab xis saum npoo thiab ua rau boiling, thiab tsis txhob muab ob npaug rau suction. Tom qab degassing tiav lawm, tua lub cev muaj zog, nqa lub graphite rotor deb ntawm cov kua nto, thiab tom qab ntawd kaw cov roj valve. Txij li cov slag tu tus neeg sawv cev ntxiv rau saum npoo ua ntej degassing, aluminium slag yog tsim los ntawm qhov chaw thaum lub sij hawm degassing. Nws yog ib qho tsim nyog los tshem tawm cov tshauv slag thiab siv lub cuab yeej tshwj xeeb los rub tawm cov lim dej hauv lub lauj kaub hloov. Nws raug pom zoo tias qhov kev ncua deb tsawg dua 50 mm los ntawm cov kua theem thiab nchuav sai thiab du. hauv ob qho tib si crucibles. Ib qho ntawm cov crucibles yog solidified nyob rau hauv ib txwm siab; lwm lub crucible yog ceev nrooj npog nrog lub tswb hub thiab nqus tsev vacuumed. Lub tshuab nqus tsev siab yuav tsum ncav cuag 8 MPa. Lub sijhawm nqus tsev yog 3 mus rau 4 feeb. Muab tso rau hauv dej kom txias, tshem tawm thiab so kom qhuav. Nias lub siab ib txwm ua ntej thiab tom qab ntawd Siv lub tshuab nqus tsev ntsuas qhov sib npaug sib npaug. Qhov tsawg dua qhov sib npaug sib npaug, qhov qis dua cov ntsiab lus hydrogen ntawm cov kua txhuas, thiab qhov zoo dua qhov degassing refining nyhuv. Cov khoom sib txawv muaj cov kev xav tau sib txawv rau qhov sib npaug sib npaug. Yog tias qhov sib npaug sib npaug yog tsis tsim nyog, nws yuav tsum tau ua kom zoo dua. Qhov sib npaug ntom ntom: DI=(ρ-ρ1)/ρ
Nyob rau hauv cov mis: ρ yog qhov ceev nyob rau hauv ib txwm siab; ρ1 yog qhov ceev hauv lub tshuab nqus tsev.
