Alumina

Aluminum'okesaside ia lŘlŘ i loko o ka 'āina i loko o ka palapala o kaʻike mau alumina, kona Nine Inch haʻilula - AL2O3. Ma kēiaʻano o nā pōaka i ole ka waihoʻoluʻu i mea ma ka wela o ka 2044 ° C hoʻomaka e maule, a me ka wā o ka nui o ka 3530 ° C hoʻolapalapa.

Ma maoli nā wahi wale nō i ka pilina paʻa nā loli substance mea Aluminum'okesaside me ka pa apŘ o 3,99 g. / Cm3. He He loa paa hāpana no a hiki i ka iwa o ka kiʻekiʻe o Mohs papaʻaina. Ke kumukuai o ka refractive inideka mea like penei: no ka mea maʻamau Ray - 1.765 a me 1.759 no ka mea kupanaha. Ma maoli nā wahi alumina pinepine he likeʻole metala oxides, nae, o ka mea pōhaku corundum ke loaʻa kekahi mau malu o kona ano. No ka laʻana, ua mau pohaku sapeiro, ka'agate, a me nā pōhaku makamae 'ē aʻe. E like me ia, i ka alumina i e makaukau a me keʻena hoʻokolohua-Nine Inch hana. No keia mea, A12O3 metastable palapala a me kā lākou mau decomposed thermally. Nō hoʻi, e like me ke kumu o ke keʻena hoʻokolohua iaoiaeii hoʻohana Aluminum'okesaside , Aluminum hydroxide.

Maʻamau nā loli i huiia o tetragonicheskuyu puka olu oia i loaʻa i loko o kona haku mele 'ana e pili ana i 1-2% wai. Hiki e loaa amorphous i loko o nā hale a alumina - alumina tuko pīlali, a gelevidny pāʻoihana a AL (OH) 3 ua dewatered e loaa i kekahi porous mea aniani moakaka nuipa a.

Aluminum'okesaside mea pono insoluble i loko o ka wai, akā, hiki ke pono ia ka pono ma ka cryolite, pii kai a hiki i ke ana wela kiʻekiʻe. Amphoteric waiwai. Characteristically ia i ka waiwai o ka synthesized alumina like me ka inverse kaukaʻi o kona ho okumu mahana a me Nine Inch aayoaeuiinoe. Likeʻimi hoʻopunipuni (a laila, loaa i ka wela o ka ma 1200 ° C), a kūlohelohe corundum i loko o ka maʻamau 'ia hōʻike nō ia oʻaneʻane hoʻokahi haneri pakeneka piha Nine Inch inertness a me ka nele o ka hygroscopicity.

'okesaside Aluminum Nine Inch waiwai helu kuhi puke i ka 'Imi hana ma ke anawela ma o ma kahi o 1000 ° C, ka wā e hoʻomaka ai i hoʻomaka koke pāʻani aku me ka' ona e like me kekahi mau mekala 'åkilikai carbonates o ka mekala' åkilikai ke hooheheeia. A pau keia AaOIeIOUIeXAOAaIN aluminates i hana. Na ke kua'āina i huiia reacts me SiO2, e like me nāʻano likeʻole o kaʻakika slags. E like me ka hopena o kēia mau hana kūleʻa i loaa aluminosilicates.

Alumina tuko pīlali a me ka alumina i i hoomakaukau ai ma ka calcination o Aluminum hydroxides i kekahi o ma ka liʻiliʻi loa 550 ° C, i ke kiʻekiʻe loa hygroscopicity, maikaʻi komo i loko o Nine Inch reactions a 'Imi pāʻani aku me kaʻakika a me kona'ākilikai pāʻoihana.

Nō kāu, e like me ka maka mea no ka hana Aluminum'okesaside e hoʻohana bauxite, alunite a me ka nepheline. A hiki i ka maʻiʻo o ka waiwai i loko o ninau i loko o ia oi ma mua o 6-7%? Iecaianoaaiiuo o ka papa kuhikuhiE ala - e Bayer, a ma ka maʻiʻo malalo o ka waiwai a pau i na mea i eliia sintering hana pu ia paha soda. Bayer kaʻina mea he aaioee pepe iho la ka pohaku i ka mea poepoe o nā mea wili, ua malamaia lakou nei, hahai bauxite me kona'ākilikai pāʻoihana ma ke ana wela o 225-250 ° C. I ka haku mele, penei ka loaa i nāu kekahi me koʻana koko paʻakai aluminate pāʻoihana a me ka i wae 'ia. Ma ke kaʻina hana o ka 'oʻoleʻa kekahi slurry i loaʻa ka alumina, nona ka waiwai hoʻopili like i ka hae, ua decomposed ma centrifuges. Oia enehana apono 'e loaa 50% hua o ka waiwai. Eia kekahi, o ka hana ana o keia iaoiaʻo ia ka mea hiki ke mālama i ka makuahine lama no ka hoʻohana ma mahope hana ma leaching o bauxite.

Nui, ka mea kūpono kemikala iaoia Aluminum'okesaside ua hoʻohana 'ia e like me ka palapala mea no ka makaukau o ka maemae Aluminum. I ka hana, ka mea, ua hoʻohana 'ia me ka maka mea no ka hana refractory mea, pālolo abrasive a me ka okioki ana i na mea paahana. enehana Hoikehonua, 'Imi pili hookahi nā pōaka o Aluminum'okesaside i loko o ka? iecaianoaaiiie hora, PCB, Jewelry.