Ukulungiswa kweIioksidi zomhlaba ezinqabileyo ze-ultrafine
Iikhompawundi zomhlaba ezinqabileyo ze-Ultrafine zinoluhlu olubanzi losetyenziso xa kuthelekiswa neekhompawundi zomhlaba ezinqabileyo ezinobungakanani bamasuntswana aqhelekileyo, kwaye ngoku kukho uphando olongezelelekileyo kuzo. Iindlela zokulungiselela zahlulwe zaba yindlela yesigaba esiqinileyo, indlela yesigaba solwelo, kunye nendlela yesigaba serhasi ngokwemeko yokuhlanganiswa kwezinto. Okwangoku, indlela yesigaba solwelo isetyenziswa kakhulu kwiilabhoratri nakwishishini ukulungiselela i-ultrafine powders yeekhompawundi zomhlaba ezinqabileyo. Ikakhulu ibandakanya indlela yemvula, indlela ye-sol gel, indlela ye-hydrothermal, indlela ye-template, indlela ye-microemulsion kunye nendlela ye-alkyd hydrolysis, phakathi kwayo indlela yemvula eyona ndlela ifanelekileyo kwimveliso yezoshishino.
Indlela yemvula kukongeza i-precipitant kwisisombululo setyuwa yesinyithi ukwenzela imvula, kwaye emva koko ukucoca, ukuhlamba, ukoma kunye nokubola kobushushu ukufumana iimveliso zomgubo. Ibandakanya indlela yemvula ethe ngqo, indlela yemvula efanayo kunye nendlela yokulinganisa. Kwindlela yemvula eqhelekileyo, ii-oxides zomhlaba ezinqabileyo kunye neetyuwa zomhlaba ezinqabileyo eziqulethe i-radicals ye-asidi eguqukayo inokufumaneka ngokutshisa i-precipitate, kunye ne-particle size ye-3-5 μ m. Indawo ethile yomphezulu ingaphantsi kwe-10 ㎡/g kwaye ayinayo iipropati ezikhethekileyo zomzimba kunye neekhemikhali. I-ammonium carbonate precipitation method kunye ne-oxalic acid precipitation method ngoku zezona ndlela zixhaphakileyo zokuvelisa iipowders ze-oxide eziqhelekileyo, kwaye nje ukuba iimeko zenkqubo yendlela yemvula zitshintshile, zingasetyenziselwa ukulungiselela i-ultrafine enqabileyo yomhlaba oksidi powders.
Uphando lubonise ukuba izinto eziphambili ezichaphazela ubungakanani bamasuntswana kunye ne-morphology yomhlaba onqabileyo we-ultrafine powders kwi-ammonium bicarbonate precipitation method ibandakanya ukuxinwa komhlaba onqabileyo kwisisombululo, ubushushu bemvula, ukugxilwa kwe-arhente yemvula, njl. Isisombululo sisitshixo sokwenza umgubo osasazekileyo we-ultrafine. Ngokomzekelo, kuvavanyo lwe-Y3 + yemvula yokulungisa i-Y2O3, xa ubunzima bomhlaba obunqabileyo buyi-20 ~ 30g / L (ibalwe yi-Y2O3), inkqubo yemvula ihamba kakuhle, kunye ne-yttrium oxide ultrafine powder efunyenwe kwi-carbonate precipitation. ukomisa kunye nokutshisa kuncinci, ukufana, kwaye iDisperity ilungile.
Kwiimpendulo zemichiza, ubushushu buyisigqibo. Kule mifuniselo ingentla, xa ubushushu bungama-60-70 ℃, imvula icotha, ukuhluzwa kuyakhawuleza, amasuntswana akhululekile kwaye afanayo, kwaye ngokusisiseko angqukuva; Xa ubushushu bokusabela bungaphantsi kwe-50 ℃, imvula yenza ngokukhawuleza, ngeenkozo ezininzi kunye nobukhulu bamasuntswana amancinci. Ngethuba lokuphendula, inani le-CO2 kunye ne-NH3 liphuphuma lincinci, kwaye imvula ikwifom enamathele, engafanelekanga ukuhluzwa kunye nokuhlamba. Emva kokuba utshiswe kwi-yttrium oxide, kusekho izinto ezibloko ezidibanisa ngokunzulu kwaye zineesayizi ezinkulu zamasuntswana. Ukuxinwa kwe-ammonium bicarbonate kuchaphazela ubungakanani be-yttrium oxide. Xa i-concentration ye-ammonium bicarbonate ingaphantsi kwe-1mol / L, i-yttrium oxide efunyenwe ubungakanani be-particle ubukhulu buncinci kwaye bufana; Xa i-concentration ye-ammonium bicarbonate idlula i-1mol/L, imvula yendawo iya kwenzeka, ibangele i-agglomeration kunye namasuntswana amakhulu. Ngaphantsi kweemeko ezifanelekileyo, ubukhulu be-particle ye-0.01-0.5 bunokufumaneka μ M ultrafine yttrium oxide powder.
Kwindlela ye-oxalate precipitation, isisombululo se-oxalic acid yongezwa nge-dropwise ngelixa i-ammonia yongezwa ukuze kuqinisekiswe ixabiso le-pH rhoqo ngexesha lenkqubo yokusabela, okubangelwa ubungakanani be-particle engaphantsi kwe-1 μ M ye-yttrium oxide powder. Okokuqala, isisombululo se-yttrium nitrate samanzi kunye namanzi e-ammonia ukufumana i-yttrium hydroxide colloid, kwaye emva koko uyiguqule ngesisombululo se-oxalic acid ukuze ufumane ubungakanani be-particle ngaphantsi kwe-1 μ Y2O3 powder of m. Yongeza i-EDTA kwi-Y3 + isisombululo se-yttrium nitrate kunye ne-concentration ye-0.25-0.5mol / L, lungisa i-pH kwi-9 ngamanzi e-ammonia, yongeza i-ammonium oxalate, kwaye udilize isisombululo se-3mol / L HNO3 kwizinga le-1-8mL / min ku-50 ℃ de imvula igqibezele kwi-pH=2. I-Yttrium oxide powder ene-particle size ye-40-100nm inokufumaneka.
Ngexesha lenkqubo yokulungiselelaIioksidi zomhlaba ezinqabileyo ze-ultrafinengokwendlela yemvula, imigangatho eyahlukeneyo ye-agglomeration ithanda ukwenzeka. Ngoko ke, ngexesha lenkqubo yokulungiselela, kuyimfuneko ukulawula ngokuthe ngqo iimeko zokudibanisa, ngokulungelelanisa ixabiso le-pH, usebenzisa i-precipitants eyahlukeneyo, ukongeza i-dispersants, kunye nezinye iindlela zokusasaza ngokupheleleyo iimveliso eziphakathi. Emva koko, iindlela zokomisa ezifanelekileyo zikhethiwe, kwaye ekugqibeleni, ukusasazwa kakuhle komhlaba onqabileyo owenziwe ngumgubo we-ultrafine ufunyanwa ngokubala.
Ixesha lokuposa: Apr-21-2023