Video: Yuav ua li cas yog caustic soda siv nyob rau hauv bauxite refining?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Ib kub caustic dej qab zib ( NaOH ) solution yog siv kom yaj cov hmoov txhuas-cov kabmob hauv cov dej bauxite (gibbsite, böhmite thiab diaspore) los tsim cov tshuaj sodium aluminate supersaturated los yog "ceev xeeb tub".
Hauv qhov no, koj yuav ua li cas kho cov bauxite?
Bauxite yog finely hauv av nyob rau hauv mills, ces tov nrog ib tug recycled caustic soda tov thiab chav nyob rau hauv lub digester hlab ntsha khiav hauj lwm ntawm kub thiab siab. Qhov no dissolves cov ntsiab lus alumina ntawm lub bauxite . Cov tshuaj yog ces txias nyob rau hauv ib tug series ntawm flash tanks.
Tom qab ntawd, lo lus nug yog, cov txheej txheem twg yog siv rau concentration ntawm bauxite? Bayer cov txheej txheem yog siv rau cov concentration ntawm aluminium ore, bauxite . Hauv no txheej txheem , cov impurities xws li hlau oxide thiab silica raug tshem tawm.
Tsis tas li ntawd paub, yuav ua li cas cov impurities hauv bauxite tshem tawm?
Cov bauxite yog purified los ntawm Bayer txheej txheem. Ua ntej lub ore yog tov nrog ib tug kub concentrated tov ntawm sodium hydroxide. NaOH yuav yaj cov oxides ntawm txhuas thiab silicon tab sis tsis yog lwm yam impurities xws li hlau oxides, uas tseem insoluble. Cov ntaub ntawv insoluble yog tshem tawm los ntawm kev lim.
Dab tsi yog electrochemical refining ntawm bauxite?
Alumina yog lub npe hu ua aluminium oxide (Al2O3). Cov txheej txheem Bayer, pom nyob rau hauv 1887, yog thawj txheej txheem uas alumina yog muab rho tawm los ntawm bauxite . Txhawm rau tsim cov ntshiab aluminium, alumina yog smelted siv Hall-Héroult electrolytic txheej txheem. Cov txheej txheem no raug xa mus rau kev tsim khoom tseem ceeb.
Pom zoo:
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Cov bauxite yog purified los ntawm Bayer txheej txheem. Ua ntej cov ore yog tov nrog ib tug kub concentrated tov ntawm sodium hydroxide. NaOH yuav yaj cov oxides ntawm txhuas thiab silicon tab sis tsis yog lwm yam impurities xws li hlau oxides, uas tseem insoluble. Cov ntaub ntawv insoluble raug tshem tawm los ntawm kev pom
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