Kugadzirira kweultrafine rare earth oxides
Ultrafine isingawanzo kugadzirwa pasi ine huwandu hwakakura hwemashandisirwo kana ichienzaniswa neasingawanzo epasi makomisheni ane akajairwa particle saizi, uye parizvino pane kumwe kutsvagisa pazviri.Iyo nzira dzekugadzirira dzakakamurwa kuita yakasimba chikamu nzira, yemvura chikamu nzira, uye gasi chikamu nzira zvichienderana nekuunganidza mamiriro echinhu.Parizvino, iyo yemvura chikamu nzira inoshandiswa zvakanyanya mumarabhoritari uye indasitiri kugadzirira ultrafine poda yeasingawanzo pasi makomisheni.Iyo inonyanya kusanganisira nzira yekunaya, sol gel nzira, hydrothermal nzira, template nzira, microemulsion nzira uye alkyd hydrolysis nzira, pakati peiyo nzira yekunaya ndiyo yakanyanya kukodzera kugadzirwa kwemaindasitiri.
Iyo nzira yekunaya ndeyekuwedzera precipitant kune simbi munyu mhinduro yekunaya, uye ipapo kusefa, kugeza, kuoma uye kupisa nekuora kuti uwane zvigadzirwa zvehupfu.Inosanganisira nzira yekunaya kwemvura yakananga, nzira yekunaya kwemvura yakafanana uye nzira yekunaya.Munzira yakajairwa yekunaya kwemvura, maokisidhi epasi asingawanzo uye munyu usingawanzowaniki ane volatile acid radicals anogona kuwanikwa nekupisa mvura, nekukura kwe3-5 μ m.Iyo chaiyo nzvimbo iri pasi pegumi ㎡/g uye haina yakakosha yemuviri nemakemikari zvivakwa.Iyo ammonium carbonate precipitation method uye oxalic acid precipitation nzira pari zvino ndiyo nzira dzinonyanya kushandiswa kugadzira akajairwa okisidhi hupfu, uye chero mamiriro emaitiro enzira yekunaya achishandurwa, anogona kushandiswa kugadzira ultrafine isingawanzo kugadzirwa pasi oxide hupfu.
Tsvagiridzo yakaratidza kuti zvinhu zvikuru zvinokanganisa saizi yechikamu uye morphology yepasi isingawanzo ultrafine poda mu ammonium bicarbonate kunaya nzira zvinosanganisira kuwanda kwepasi risingawanzo mumhinduro, tembiricha yekunaya, kunaya kwemvura, nezvimwewo. mhinduro ndiyo kiyi yekugadzira yakafanana yakaparadzirwa ultrafine poda.Semuenzaniso, mukuedza kweY3 + kunaya kwekugadzirira Y2O3, apo kuwanda kwepasi risingawanzo 20 ~ 30g/L (yakaverengerwa neY2O3), nzira yekunaya kwemvura inotsvedzerera, uye yttrium oxide ultrafine poda yakawanikwa kubva kune carbonate precipitation by. kuomesa nekupisa idiki, yunifomu, uye Disperity yakanaka.
Mukuita kwemakemikari, tembiricha chinhu chakakosha.Muzviedzo zviri pamusoro apa, kana tembiricha iri 60-70 ℃, kunaya kunononoka, kusefa kunokurumidza, zvimedu zvakasununguka uye zvakafanana, uye zvine denderedzwa;Kana tembiricha yekupindura iri pazasi pe50 ℃, kunaya kwemvura kunoita nekukurumidza, iine zviyo zvakawanda uye diki diki.Munguva yemhinduro, huwandu hwe CO2 uye NH3 inofashukira ishoma, uye kunaya kuri mune inonamira fomu, iyo isingakodzeri kusefa nekugeza.Mushure mekupiswa mu yttrium oxide, kuchine blocky zvinhu zvinoungana zvakakomba uye zvine hombe particle size.Iko kusanganiswa kweammonium bicarbonate kunokanganisawo saizi yeyttrium oxide.Kana huwandu hweammonium bicarbonate huri pasi pe1mol / L, iyo inowanikwa yttrium oxide particle size idiki uye yakafanana;Kana huwandu hweammonium bicarbonate hukadarika 1mol/L, kunaya kwenzvimbo kunoitika, zvichikonzera kusangana uye zvimedu zvakakura.Pasi pemamiriro akakodzera, saizi ye 0.01-0.5 inogona kuwanikwa μ M ultrafine yttrium oxide poda.
Muiyo oxalate precipitation nzira, iyo oxalic acid mhinduro inowedzerwa inodonha nepo ammonia ichiwedzerwa kuti ive nechokwadi chenguva dzose pH kukosha panguva yekuita maitiro, zvichikonzera saizi yepakati isingasviki 1 μ M yeyttrium oxide poda.Kutanga, precipitate yttrium nitrate solution nemvura yeammonia kuti uwane yttrium hydroxide colloid, uye wozoishandura ne oxalic acid solution kuti uwane hukuru hwepakati pasi pe 1 μ Y2O3 poda ye m.Wedzera EDTA kuY3 + solution yeyttrium nitrate ine 0.25-0.5mol/L, gadzirisa pH kusvika 9 nemvura yeammonia, wedzera ammonium oxalate, uye donha 3mol/L HNO3 solution pamwero we1-8mL/ min pa50 ℃ kusvika kunaya kwapera pa pH=2.Yttrium oxide poda ine particle size ye40-100nm inogona kuwanikwa.
Panguva yekugadziriraultrafine rare earth oxidesnenzira yekunaya, madhigirii akasiyana eagglomeration anowanzo kuitika.Naizvozvo, panguva yekugadzirira, zvinodikanwa kunyatso kudzora mamiriro ekutanga, nekugadzirisa iyo pH kukosha, uchishandisa akasiyana precipitants, kuwedzera dispersants, uye dzimwe nzira dzekuparadzira zvizere zvigadzirwa zvepakati.Zvadaro, nzira dzakakodzera dzekuomesa dzinosarudzwa, uye pakupedzisira, yakapararira isingawanzo pasi pasi yakasanganiswa ultrafine powders inowanikwa kuburikidza necalcination.
Nguva yekutumira: Kubvumbi-21-2023