Ko te tikanga whakapouri hau he tikanga whakapouri e whakamahi ana i te hāora i roto i te hau ki te oxidizeceriumki te tetravalent i raro i etahi tikanga.Ko te tikanga ko tenei tikanga ko te tunu i te konupora fluorocarbon cerium ore, oxalates whenua onge, me te warowaiha ki te hau (mohiotia ko te whakamau i te waiora) te tunu ranei i nga waiora o te whenua onge (te hau whakamaroke hau maroke) te whakauru ranei i te hau ki roto o te whenua onge hydroxides slurry (te hau makuku waiora) mo te waikura.
1、 Roasting hāora
Te tunu i te konupuku cerium fluorocarbon ki te hau i te 500 ℃, te tunu ranei i te Baiyunebo onge whenua concentrate ki te konutai waro ki te hau i te 600-700 ℃.I te wa o te pirau o nga kohuke whenua onge, ka waikurahia te cerium i roto i nga kohuke ki te tetravalent.Nga tikanga mo te weheceriummai i nga hua calcined ko te tikanga tote rua o te whenua sulfate, tikanga tangohanga whakarewa, aha atu.
I tua atu i te oxidation rosting owhenua ongete kakano, te tote penei i te oxalate whenua onge me te warowaikawa whenua onge ka paopao ki roto i te hau hau, ka waikurahia te cerium ki te CeO2.Kia pai te whakarewatanga o te ranunga waikura whenua onge i te tunu, kia kaua e tiketike rawa te pāmahana tunu, i waenga i te 700 me te 800 ℃.Ka taea te whakakore i nga waikura i roto i te 1-1.5mol/L wairewa waikawa pungatara, 4-5mol/L wairewa waikawa nitric ranei.I te wa e werohia ana te hinu pahuhu ki te waikawa pungatara me te waikawa nitric, ka uru te cerium ki te otinga i roto i te ahua tetravalent.Ko te mea o mua ko te tango i te wairewa onge whenua ngawha he 50g/L REO kei roto i te 45 ℃, katahi ka whakaputa cerium dioxide ma te whakamahi i te tikanga tangohanga P204;Ko te mea whakamutunga ko te whakarite i te wairewa pakawa whenua onge kei roto REO o 150-200g/L i te pāmahana o te 80-85 ℃, ka whakamahi i te tangohanga TBP hei wehe i te cerium.
Ka rewa nga waikura onge whenua ki te waikawa pungatara waimeha, waikawa nitric ranei, he ahua kore te CeO2.Na reira, he iti te waikawa hydrofluoric me whakauru ki te otinga hei whakakorikori i te waahanga o muri o te whakakorenga hei whakapai ake i te whakarewatanga o te CeO2.
2、 Te waikura hau maroke
Whakanohoia te waiwai onge whenua ki roto i te oumu whakamaroke ka whakahaorahia i raro i nga tikanga whai hau i te 100-120 ℃ mo te 16-24 haora.Ko te tauhohenga waiora e whai ake nei:
4Ce(OH)3+O2+2H2O=4Ce(OH)4
Ko te tere o te haukura o te cerium ka tae ki te 97%.Mena kei te piki ake te paanga o te waiora ki te 140 ℃, ka taea te whakapoto i te wa o te waikura ki te 4-6 haora, ka taea hoki te tere o te haukura o te cerium ki te 97% ~ 98%.Ko te tukanga whakamaroke hau maroke ka whakaputa i te nui o te puehu me nga tikanga mahi kino, e whakamahia ana i tenei wa i roto i te taiwhanga.
3、 Ko te hau hau mākū o te hau
Whakaranuhia te waiwaiwai onge whenua ki te wai hei hanga slurry, whakahaere i te kukū REO ki te 50-70g/L, tāpiri NaOH ki te whakapiki ake i te alkalinity o te slurry ki te 0.15-0.30mol/L, a ka wera ki te 85 ℃, tika whakauru hau ki whakahāorahia te cerium trivalent katoa i roto i te slurry ki te cerium tetravalent.I roto i te tukanga hāoratanga, he ahua nui te whakaetonga o te wai, no reira me tapiri etahi wai i nga wa katoa kia mau tonu ai te kukū o te whenua onge.A, no te 40L o slurry te oxidized i roto i ia puranga, te wa hāora ko 4-5 haora, a ka taea te tere hāora o cerium 98%.A, no te 8m3 o slurry onge whenua waihā te oxidized ia wa, te auau rere hau ko 8-12m3 / min, a ka nui haere te wa hāora ki te 15h, te tere hāora o cerium taea tae 97% ~ 98%.
Ko nga ahuatanga o te tikanga whakangao hau makuku hau ko: te nui o te waikura o te cerium, te whakaputanga nui, te pai o te mahi, te mahi ngawari, a ko tenei tikanga e whakamahia nuitia ana i roto i te umanga ki te whakaputa i te hauhā cerium masivesivá.
4、 Te waikura hau mākū pēhanga
I raro i te pehanga noa, ka roa ake te wa whakapouritanga o te hau, ka whakapotohia e te tangata te wa whakapouri ma te whakamahi i te pehanga.Ko te pikinga o te pehanga hau, ara, ko te pikinga o te pehanga wahanga o te hāora i roto i te punaha, he pai ki te rewa o te hāora i roto i te otinga me te tiritiri o te hāora ki te mata o nga matūriki hydroxide whenua onge, na reira ka tere ake te mahi o te waikura.
Whakaranuhia te waiwai wai onge whenua ki te wai ki te 60g/L, whakatikahia te pH ki te 13 me te konutai waikawa, whakanekehia te pāmahana ki te 80 ℃, whakaurua te hau mo te waiora, te whakahaere i te pehanga ki te 0.4MPa, me te oxidize mo te 1 haora.Ko te tere o te haukura o te cerium ka eke ki te 95%.I roto i te hanga tūturu, ka whiwhi te waikura onge whenua matawai waikura i te huringa alkali i roto i te rerenga o te whenua onge konutai pūkawa ngāwha tote matatini.Hei whakapoto i te mahi, ka taea te taapiri i te rerenga o te konutai konutai konutai te tote matatini me te wairewa kawakore ki roto i te taika waikura, ka mau tonu te pehanga me te pāmahana.Ka taea te whakauru mai i te hau, te hauora whai kiko ranei hei huri i te whenua onge i roto i te tote matatini ki roto i nga hauwai onge whenua, a, i taua wa ano, ka taea te Ce (OH) 3 i roto ki te waikura hei Ce (OH) 4.
I raro i nga ahuatanga o te pehanga, ka pai ake te tere o te huringa alkali o te tote matatini, te tere o te whakapouri o te cerium, me te tere o te waiora o te cerium.I muri i te 45 meneti o te tauhohenga, ka eke te tere o te huringa o te alkali tote rua me te tere o te waikura o te cerium ki runga i te 96%.
Te wa tuku: Mei-09-2023