Txoj Kev Npaj ntawm High-Strength Graphite Silicon Carbide Crucible rau Hlau Smelting

Txoj kev npaj ntawm lub zog siabgraphite silicon carbide cruciblerau hlau smelting muaj xws li cov kauj ruam hauv qab no: 1) raw khoom npaj; 2) kev sib xyaw ua ke; 3) cov khoom kom qhuav; 4) crushing thiab tshuaj ntsuam xyuas; 5) kev npaj cov khoom siv thib ob; 6) kev sib xyaw ua ke; 7) nias thiab molding; 8) txiav thiab txiav; 9) ziab; 10) glazing; 11) Kev tua thawj zaug; 12) impregnation; 13) Kev tua hluav taws thib ob; 14) txheej; 15) cov khoom tiav. Lub crucible uas tsim los siv cov qauv tshiab no thiab cov txheej txheem ntau lawm muaj zog-kub thiab corrosion kuj. Qhov nruab nrab lifespan ntawm lub crucible ncav cuag 7-8 lub hlis, nrog ib tug zoo xws li cov qauv thiab tsis muaj qhov tsis xws luag, muaj zog, nyias phab ntsa, thiab zoo thermal conductivity. Tsis tas li ntawd, cov txheej txheem glaze thiab txheej txheej ntawm qhov chaw, nrog rau ntau yam ziab thiab tua cov txheej txheem, ua kom cov khoom muaj zog tiv thaiv corrosion thiab txo qis zog ntawm kwv yees li 30%, nrog rau qib siab ntawm vitrification.

Txoj kev no suav nrog kev ua haujlwm ntawm cov hlau tsis yog hlau casting, tshwj xeeb tshaj yog txoj kev npaj ntawm high-strength graphite silicon carbide crucible rau hlau smelting.

[Background Technology] Tshwj xeeb graphite silicon carbide crucibles yog tsuas yog siv nyob rau hauv non-ferrous hlau casting thiab forging txheej txheem, raws li zoo raws li nyob rau hauv lub rov qab thiab refining ntawm precious hlau, thiab zus tau tej cov high-temperature thiab corrosion-resistant khoom yuav tsum tau rau cov yas, ceramics, iav, cement, roj hmab, thiab kev tsim tshuaj, nrog rau cov thawv ntim khoom uas yuav tsum tau muaj hauv kev lag luam petrochemical.

Existing tshwj xeeb graphite silicon carbide crucible formulations thiab ntau lawm txheej txheem tsim cov khoom nrog ib tug nruab nrab lifespan ntawm 55 hnub, uas yog luv heev. Kev siv thiab cov nqi tsim khoom txuas ntxiv nce ntxiv, thiab cov khoom siv pov tseg kuj tseem siab. Yog li ntawd, kev tshawb fawb hom tshiab tshwj xeeb graphite silicon carbide crucible thiab nws cov txheej txheem tsim khoom yog qhov teeb meem ceev los daws, vim cov crucibles no muaj cov ntawv thov tseem ceeb hauv ntau yam kev lag luam tshuaj.

[0004] Txhawm rau daws cov teeb meem saum toj no, ib txoj hauv kev los npaj lub zog siab graphite silicon carbide crucibles rau hlau smelting yog muab. Cov khoom npaj raws li txoj kev no yog tiv taus kub thiab corrosion, muaj lub neej ntev kev pab cuam, thiab ua tiav kev txuag hluav taws xob, emission txo, kev tiv thaiv ib puag ncig, thiab cov khoom siv rov ua dua tshiab ntawm cov khoom pov tseg thaum lub sij hawm tsim khoom, ua kom muaj txiaj ntsig zoo thiab siv cov peev txheej.

Txoj kev npaj ntawm high-strength graphite silicon carbide crucibles rau hlau smelting muaj xws li cov nram qab no cov kauj ruam:

1. Kev npaj cov khoom siv raw: Silicon carbide, graphite, av nplaum, thiab hlau silicon tau muab tso rau hauv lawv cov khoom siv hoppers los ntawm crane, thiab PLC qhov kev pab cuam cia li tswj cov paug thiab hnyav ntawm txhua yam khoom raws li qhov yuav tsum tau ua. Pneumatic li qub tswj qhov tso tawm, thiab tsawg kawg yog ob lub ntsuas qhov hnyav tau teeb tsa rau hauv qab ntawm txhua cov khoom siv hopper. Tom qab qhov hnyav, cov ntaub ntawv raug muab tso rau hauv lub tshuab sib tov los ntawm lub laub tsis siv neeg txav tau. Thawj qhov sib ntxiv ntawm silicon carbide yog 50% ntawm nws tag nrho cov nyiaj.
2. Kev sib xyaw thib ob: Tom qab cov khoom siv raw tau sib xyaw hauv lub tshuab sib xyaw, lawv tau tawm mus rau hauv qhov tsis sib xws, thiab cov khoom siv hauv qhov tsis sib xws yog nqa mus rau qhov sib xyaw hopper los ntawm lub thoob of elevator rau kev sib xyaw thib ob. Cov cuab yeej tshem tawm hlau yog teem rau ntawm qhov chaw nres nkoj ntawm lub thoob of elevator, thiab cov khoom siv dej ntxiv tau teeb tsa saum toj ntawm qhov sib xyaw hopper ntxiv dej thaum nplawm. Cov dej ntxiv yog 10L / min.
3. Cov khoom kom qhuav: Cov khoom ntub dej tom qab sib tov yog qhuav hauv cov khoom siv ziab ntawm qhov kub ntawm 120-150 ° C kom tshem tawm cov dej noo. Tom qab ua tiav ziab, cov khoom raug muab tshem tawm kom txias txias.
4. Crushing thiab tshuaj ntsuam: Cov khoom qhuav clumped nkag mus rau hauv crushing thiab tshuaj ntsuam cov cuab yeej rau pre-crushing, ces nkag mus rau hauv counterattack crusher rau ntxiv crushing, thiab ib txhij dhau los ntawm ib tug 60-mesh soj ntsuam cov khoom. Cov khoom loj dua 0.25mm raug xa rov qab rau kev rov ua dua tshiab rau kev sib tsoo ua ntej, crushing, thiab tshuaj ntsuam xyuas, thaum cov khoom me dua 0.25mm raug xa mus rau lub hopper.
5. Kev npaj cov khoom siv thib ob: Cov ntaub ntawv hauv qhov tso tawm hopper raug thauj rov qab mus rau lub tshuab batching rau kev npaj theem nrab. Qhov seem 50% ntawm silicon carbide ntxiv thaum lub sij hawm kev npaj theem nrab. Cov ntaub ntawv tom qab kev npaj theem nrab raug xa mus rau lub tshuab sib tov kom rov sib tov.
6. Kev sib xyaw thib ob: Thaum lub sij hawm sib xyaw ua ke, cov tshuaj tshwj xeeb nrog viscosity yog ntxiv rau qhov sib xyaw hopper los ntawm cov tshuaj tshwj xeeb ntxiv cov cuab yeej nrog lub ntiajteb txawj nqus tshwj xeeb. Cov tshuaj tshwj xeeb yog ntsuas los ntawm lub thoob qhov hnyav thiab ntxiv rau qhov sib xyaw hopper.
7. Nias thiab molding: Cov ntaub ntawv tom qab kev sib xyaw ua ke yog xa mus rau isostatic pressing tshuab hopper. Tom qab thauj khoom, compaction, nqus tsev, thiab tu hauv pwm, cov ntaub ntawv raug nias rau hauv isostatic pressing tshuab.
8. Txiav thiab trimming: Qhov no suav nrog txiav qhov siab thiab txiav cov crucible burrs. Txiav yog ua los ntawm lub tshuab txiav los txiav lub crucible mus rau qhov siab xav tau, thiab cov burrs tom qab txiav yog txiav.
9. Qhuav: Lub crucible, tom qab txiav thiab trimmed nyob rau hauv kauj ruam (8), yog xa mus rau lub qhov cub kom qhuav kom qhuav, nrog ib tug qhuav kub ntawm 120-150 ° C. Tom qab ziab, nws yog khaws cia sov li 1-2 teev. Lub qhov cub kom qhuav yog nruab nrog lub tshuab cua hloov kho, uas muaj ob peb daim hlau hloov tau. Cov phaj aluminium adjustable no yog teem rau ntawm ob sab sab hauv ntawm lub qhov cub kom qhuav, nrog rau cov pa cua ntawm txhua ob daim hlau. Qhov sib txawv ntawm txhua ob daim hlau txhuas yog kho kom tswj tau cov pa cua.
10. Glazing: Cov glaze yog tsim los ntawm kev sib xyaw cov ntaub ntawv glaze nrog dej, suav nrog bentonite, refractory av nplaum, iav hmoov, feldspar hmoov, thiab sodium carboxymethyl cellulose. Lub glaze yog siv manually nrog txhuam thaum glazing.
11. Thawj tua hluav taws: Lub crucible uas siv glaze raug rho tawm haujlwm ib zaug hauv qhov cub rau 28-30 teev. Txhawm rau txhim kho kev ua haujlwm tua hluav taws, lub txaj labyrinth kiln nrog cov nyhuv sealing thiab huab cua thaiv yog teem rau hauv qab ntawm lub kiln. Lub txaj kiln muaj ib txheej hauv qab ntawm cov paj rwb sealing, thiab saum toj no lub sealing paj rwb, muaj ib txheej ntawm rwb thaiv tsev cib, tsim ib lub labyrinth kiln txaj.
12. Impregnation: Cov hluav taws kub hnyiab tau muab tso rau hauv lub tank impregnation rau lub tshuab nqus tsev thiab siab impregnation. Cov tshuaj impregnation yog thauj mus rau lub impregnation tank los ntawm lub kaw lus kaw, thiab lub sij hawm impregnation yog 45-60 feeb.
13. Secondary firing: Lub impregnated crucible yog muab tso rau hauv ib lub qhov cub rau theem nrab firing rau 2 teev.
14. Txheej: Lub crucible tom qab kev tua hluav taws kub yog coated nrog dej-raws li acrylic resin xim rau ntawm qhov chaw.
15. Cov khoom tiav: Tom qab txheej txheej tiav, qhov saum npoo yog qhuav, thiab tom qab ziab, lub crucible yog ntim thiab khaws cia.