Shiri naultrafine rare duniya oxides
Mahalli na ƙasa na ultrafine yana da fa'idar amfani da yawa idan aka kwatanta da mahaɗar ƙasa da ba kasafai ba tare da girma dabam dabam, kuma a halin yanzu akwai ƙarin bincike akan su.Hanyoyi na shirye-shiryen sun kasu kashi-kashi mai tsauri, hanyar ruwa, da kuma hanyar lokaci na iskar gas bisa ga yanayin tara abun.A halin yanzu, hanyar ruwa lokaci ana amfani da ko'ina a dakunan gwaje-gwaje da masana'antu don shirya ultrafine powders na kasa mahadi.Ya ƙunshi hanyar hazo, hanyar sol gel, hanyar hydrothermal, hanyar samfuri, hanyar microemulsion da hanyar alkyd hydrolysis, wanda hanyar hazo ta fi dacewa da samar da masana'antu.
Hanyar hazo ita ce a saka magudanar ruwa a cikin maganin gishiri na karfe don ruwan sama, sannan a tace, wanke, bushe da zafi da bazu don samun kayan foda.Ya ƙunshi hanyar hazo kai tsaye, hanyar hazo iri ɗaya da hanyar hazo.A cikin hanyar hazo na yau da kullun, ƙarancin ƙasa oxides da ƙarancin ƙasa mai ƙarancin gishiri mai ɗauke da radical acid masu canzawa ana iya samun su ta hanyar kona hazo, tare da girman barbashi na 3-5 μm.Ƙayyadadden yanki bai wuce 10 ㎡/g ba kuma bashi da kaddarorin jiki da sinadarai na musamman.Hanyar hazo na ammonium carbonate da hanyar hazo oxalic acid a halin yanzu sune hanyoyin da aka fi amfani da su don samar da foda na yau da kullun, kuma muddin aka canza yanayin yanayin yanayin hazo, ana iya amfani da su don shirya ultrafine rare earth oxide powders.
Bincike ya nuna cewa manyan abubuwan da suka shafi girman barbashi da ilimin halittar jiki na rare duniya ultrafine powders a cikin ammonium bicarbonate hazo hanya sun hada da maida hankali na rare ƙasa a cikin bayani, hazo zafin jiki, hazo wakili maida hankali, da dai sauransu A taro na rare ƙasa a cikin ƙasa. Magani shine mabuɗin ƙirƙirar foda na ultrafine iri ɗaya.Alal misali, a cikin gwajin Y3 + hazo don shirya Y2O3, lokacin da taro taro na rare duniya ne 20 ~ 30g / L (lisafta ta Y2O3), da hazo tsari ne santsi, da kuma yttrium oxide ultrafine foda samu daga carbonate hazo ta bushewa da konewa kadan ne, uniform, kuma Watsewa yana da kyau.
A cikin halayen sinadarai, zafin jiki shine muhimmin abu.A cikin gwaje-gwajen da ke sama, lokacin da zafin jiki ya kasance 60-70 ℃, hazo yana jinkirin, tacewa yana da sauri, barbashi suna sako-sako da uniform, kuma suna da mahimmanci;Lokacin da zafin jiki ya kasance ƙasa da 50 ℃, hazo yana ƙima da sauri, tare da ƙarin hatsi da ƙarami masu girma dabam.A lokacin amsawa, yawan adadin CO2 da NH3 ya ragu, kuma hazo yana cikin nau'i mai tsayi, wanda bai dace da tacewa da wankewa ba.Bayan an ƙone su zuwa cikin yttrium oxide, har yanzu akwai abubuwa masu toshewa waɗanda ke yin girma da ƙarfi kuma suna da girman barbashi.Matsakaicin ammonium bicarbonate shima yana rinjayar girman barbashi na yttrium oxide.Lokacin da maida hankali na ammonium bicarbonate ya kasance ƙasa da 1mol / L, girman barbashi na yttrium oxide da aka samu yana ƙarami kuma iri ɗaya;Lokacin da maida hankali na ammonium bicarbonate ya wuce 1mol/L, hazo na gida zai faru, yana haifar da agglomeration da manyan barbashi.A ƙarƙashin yanayin da ya dace, ana iya samun girman ƙwayar 0.01-0.5 μ M ultrafine yttrium oxide foda.
A cikin hanyar hazo oxalate, ana ƙara maganin oxalic acid a hankali yayin da aka ƙara ammonia don tabbatar da ƙimar pH akai-akai yayin aiwatar da amsawa, wanda ya haifar da girman barbashi ƙasa da 1 μ M na yttrium oxide foda.Da farko, zazzage maganin yttrium nitrate tare da ruwan ammonia don samun yttrium hydroxide colloid, sannan a canza shi tare da maganin oxalic acid don samun girman barbashi ƙasa da 1 μ Y2O3 foda na m.Ƙara EDTA zuwa Y3 + maganin yttrium nitrate tare da maida hankali na 0.25-0.5mol / L, daidaita pH zuwa 9 tare da ruwan ammonia, ƙara ammonium oxalate, kuma drip a 3mol / L HNO3 bayani a cikin adadin 1-8mL / min a 50 ℃ har sai hazo ya cika a pH = 2.Yttrium oxide foda da wani barbashi size na 40-100nm za a iya samu.
A lokacin aiwatar da shiriultrafine rare duniya oxidesta hanyar hazo, daban-daban digiri na agglomeration ne mai yiwuwa ya faru.Sabili da haka, a lokacin shirye-shiryen shirye-shiryen, ya zama dole don sarrafa yanayin haɗin kai, ta hanyar daidaita ƙimar pH, ta amfani da hazo daban-daban, ƙara masu rarrabawa, da sauran hanyoyi don tarwatsa samfurori na tsaka-tsaki.Sa'an nan, dace bushewa hanyoyin da aka zaba, kuma a karshe, da kyau tarwatsa rare earth fili ultrafine powders ana samun ta hanyar calcination.
Lokacin aikawa: Afrilu-21-2023