Boehmite 101: Crystal Structure, Properties, uye Mineralogy

1. Nhanganyaya

Boehmite, kemikari inoratidzwa sealuminium oxide hydroxide (AlO(OH)), inomira seyakakosha, inonakidza, uye inosiyana-siyana yemaminerari chikamu mukati meyakafara aluminium oxyhydroxide mhuri. Kunyange zvazvo yaimbozivikanwa nenyanzvi dzezvemamiriro ekunze nemainjiniya emigodhi sechinhu chakajairika chesimbi yealuminiyamu inotorwa pachishandiswa nzira yeBayer, boehmite yakashanduka mumakumi anoverengeka emakore apfuura kuita yakakwira-kukosha kwakasiyana siyana kemikari, yakaomesesa inokonzeresa simbi inotangira, uye neyayo yepamusoro inoshanda. Hunhu hwayo hwakasiyana-siyana, kugadzikana kwekushisa kunoshamisa, makemikari epamusoro, uye chimiro chakanaka chezvakatipoteredza zvakachiisa pamberi pemaindasitiri emazuva ano, kubva pakunatsa petrochemical uye kugadzirisa kwezvakatipoteredza kusvika pakucheka{3}edge lithium{4}ion bhatiri rekuchengetedza zvikamu nepamusoro{5}mapolymer maitiro.

Kunzwisisa boehmite kunoda hunyanzvi hwakasiyana-siyana, kuongorora kwakadzama kwesainzi kwekwakabva mineralological, atomic-level crystal configuration, thermodynamic behaviour, uye akasiyana physicochemical properties. Sezvo maindasitiri emazuva ano ekugadzira ari kuwedzera kuda zvinhu zvine hunyanzvi zvinokwanisa kumirisana nemamiriro ekushanda ane hutsinye, kutevedzera mitemo yekuchengetedza pasi rose, uye kupa hunyanzvi hwekushanda, boehmite yatora kutarisisa kwakanyanya kwevaongorori vezvidzidzo, masayendisiti ezvekushandisa, uye vanogadzira maindasitiri zvakafanana. Chinyorwa ichi chine hudzamu chinopa -muono wakadzama, wakadzama weboehmite, kunyatsoongorora maitikiro ayo enzvimbo, maumbirwo ayo ekristaro yakaoma kunzwisisa, maitiro ayo akakosha emuviri nemakemikari, uye maindasitiri echizvino-zvino anosimbisa kukosha kwayo kwehupfumi nehunyanzvi muupfumi hwepasi rose.

2. Mineralogy uye Natural Kuitika kweBoehmite

Geological Context uye Kuumbwa

Boehmite iminerari yechipiri yakapararira inowanikwa zvakanyanya mumadhipoziti ebauxite, ayo anoshanda senzvimbo inotengeswa pasi rose yealuminium metal uye zvakasiyana-siyana zvealuminium-zvigadzirwa zvemakemikari. Inonyanya kuumbwa kuburikidza nekunyanya, kwenguva refu kemikari yealuminium {{2} inotakura silicate matombo, feldspars, uye igneous kana metamorphic matombo evabereki pasi pemamiriro ekunze anodziya uye ekunze kwemamiriro ekunze, kana neimwe nzira kuburikidza nekushandurwa kwemaminerari ekutanga aluminosilicate pasi peiyo hydrothermal kana yakadzika diagenetic geological regimes. Mumazhinji makuru ekuumbwa kwebauxite kutenderera pasirese, boehmite inogara pamwe chete nemamwe aruminiyamu hydroxides uye oxides, kunyanya gibbsite (Al(OH)3) uye diaspore (AlO(OH)). Kuwanda kwakawanda, crystallinity, uye kugoverwa kwenzvimbo ye boehmite mukati me bauxite deposit inoshanda seyakakosha hupfumi uye tekinoroji zviratidzo zvekutengesa zvicherwa, sezvo boehmite inoda zvakanyanya kuomarara tembiricha, kudzvanywa, uye caustic digestion mamiriro panguva yeindasitiri yeBayer process ichienzaniswa negibbsite, inopesvedzera zvakananga chirimwa engineering dhizaini, kushandiswa kwesimba, uye hupfumi hwese hwekushanda.

Kuzivikanwa uye Crystallography

Nezvicherwa, boehmite yakatanga kuzivikanwa nekutsanangurwa nesainzi mukutanga kwezana ramakore rechimakumi maviri, ichizopihwa zita remuGermany ane mukurumbira wekemesitiri Johannes Böhm, akaita zvidzidzo zvekutanga zvemagadzirirwo earuminiyamu hydroxides ekutanga X-ray diffraction techniques. Muchisikigo, boehmite haiwanzoitika yakakura,{2}}yakagadzirwa macroscopic makristasi ega anogona kuunganidzwa zviri nyore nemaoko kana kutsaurwa nemuchina; pachinzvimbo, rinowanzo ratidza se microcrystalline aggregates, ivhu guru, ivhu-sezvakaita matrix components, kana kuti akachenesesa -grained protective coatings mukati me bauxite ores uye laterititic profiles. Maitiro ekuongorora epamusoro, akadai sehupfu X-ray diffraction (XRD), yakakwirira-resolution transmission electron microscopy (TEM), scanning electron microscopy (SEM), neFourier-transform infrared spectroscopy (FTIR), yakakosha zvikuru pakuona kwayo nemazvo uye kutaridzika kwayo kwemavara echicherwa uye quantification can luminum uye quantification can hydroxide. Kunzwisisa kuparadzirwa kwayo kwechisikigo kunobatsira nyanzvi dze geologist kumeta bauxite genesis nemazvo uye kunobatsira mainjiniya emigodhi mukugadzirisa ore{10}}kugadziridza nzira dzepasi rose dzekugadzira aruminiyamu.

3. Chimiro cheCrystal cheBoehmite

Orthorhombic Crystalline Framework

Padanho reatomu, chimiro chekristaro che boehmite chinotsanangurwa ne orthorhombic lattice system, inowanzova yeboka remuchadenga Cmcm. Mavakirwo emukati e boehmite anonyanya kuumbwa nemashizha maviri kana zvidimbu zve octahedra, apo imwe neimwe yepakati aruminiyamu ion inobatanidzwa symmetrically nematanhatu akapoteredza okisijeni uye hydroxyl ions. Mukati memashizha akatambanudzwa aya, maatomu eokisijeni nemapoka ehydroxyl akarongwa muhombe, akavharika{2}}packed configuration, ukuwo maion aaruminiyamu achitora nzvimbo dzeoctahedral interstitial pakati pawo. Iyo inotsanangura yekuvaka uye thermodynamic chimiro che boehmite's crystal lattice ndiyo yakakura, yakarongedzerwa zvakanyanya network yeakasimba mabhondi ehydrogen anoshanda zvakananga pakati pepedyo octahedral sheets. Iyi yakasimba interlayer hydrogen bonding inobata dhizaini pamwe chete zvakasimba, ichipa kuoma kwakakura kwemuchina, makemikari kuramba, uye kugadzikana kwekupisa kana zvichienzaniswa nearuminiyamu hydroxides segibbsite, iyo inoratidzira isina kusimba kwazvo interlayer bonding masimba.

Kuenzanisa Kwemaitiro nePolymorphs

Boehmite inogovanisa kemikari chaiyo stoichiometry se diaspore, ese ari muboka realuminium oxide hydroxides ane empirical formula AlO(OH), asi anopenya mumakristaro akasiyana zvachose-boehmite ane orthorhombic chimiro, nepo diaspore ichipenya mumonoclinic system. Ichi chimiro chepolymorphism chinoguma nekuwanda kwakasiyana kwakasiyana kwemuviri, ndege dzekutsemura, hurema hwekuomarara, uye hunhu hwe thermodynamic. Uyezve, kana ichienzaniswa yakananga kune trihydroxide mineral gibbsite (Al(OH) 3), boehmite ine yakanyanya kushomeka yemvura paatomu yealuminium. Aya akakosha crystallographic misiyano inoraira kuti chicherwa chega chega chinopindura sei pakupisa, zvichipesvedzera iyo chaiyo, inoteedzana nhevedzano yechikamu shanduko inoitika kana zvinhu izvi zviri pasi pekupisa kwakanyanya mumaindasitiri calciners, ceramic kilns, kana murabhoritari yekupisa kupisa zviridzwa.

4. Physicochemical Properties yeBoehmite

Thermal uye Thermodynamic Behavior

Chimwe chezvakanyanya kukosha uye chinoshandiswa pakutengeserana cheboehmite inokwanisa kufanoziva,-yakanyorwa nemaitiro ekupisa kwayo. Kana boehmite ichiiswa mukudziya kunofambira mberi, inosangana neyakaomarara, yakanyanya endothermic chikamu shanduko. Sezvo tembiricha inokwira kusvika 300 madhigirii celsius kusvika angangoita 500 madhigirii celsius, crystal lattice inoburitsa mapoka ayo ehydroxyl akasungwa semhute yemvura yakachena, ichisandura zvakarongeka kuita maalumina akasiyana-siyana anochinja, akadai segamma{5}}alumina, delta{6}}inoshandura alumina, uye isati yavapo{7} alpha-alumina patembiricha yepamusoro inodarika 1100 degrees Celsius. Iyi endothermic dehydration process, pamwe nekukwanisa kwayo kuburitsa mhute yemvura yakachena zvisina njodzi, inoita kuti boehmite ive inovharisa kupisa uye isingaite {{11}chepfu, eco-murazvo wehushamwari-usingadzoreki kuzofa kwepolymer nemaapplication emagetsi.

Surface Chemistry uye Reactivity

Boehmite inoratidzira kemesitiri yepamusoro, inoratidzwa nenzvimbo yakakwirira zvakanyanya, kunyanya kana yagadzirwa nenzira dzakanyanya kunaya yehydrothermal kuti ibudise nano{0}}zvimedu zvakakura, fibrous crystals, kana colloidal boehmite sols. Iyo yepamusoro yekugadzira boehmite particles yakazara nevanhu vane reactive hydroxyl mapoka, ichipa yakasarudzika amphoteric hunhu hunoibvumira kudyidzana zvakanaka neese ari maviri uye akakosha makemikari marudzi mumhinduro. Mukumisikidzwa kwemvura, boehmite inogona kuumba yakagadzika, translucent colloidal sols, chivako chinoshandiswa zvakanyanya musol sol-nzira dzekugadzira gel dzekugadzira ceramics, zvinodzivirira, uye membrane kugadzira. Aya maitiro akasiyana-siyana, akasanganiswa nemaitiro anogoneka zvikuru kubva pandiro-sekristaro kusvika pakakwirira-chimiro-ratio fibrous tsono, inobvumira masayendisiti kugadziridza boehmite nokuda kwakanangwa rheological control, yakakwidziridzwa adsorption, uye sophisticated heterogeneous application.

5. Indasitiri Kukosha uye Mazuva Ano Zvikumbiro

Precursor yeSpecialty Aluminas uye Catalysts

Boehmite inoshanda seyakatangira muindastiri kune yakakura-kugadzira kwepamusoro-kuchena shanduko yealumina, kunyanya gamma-alumina. Aya maaluminas anochinja ane porosity yakasarudzika, kurongeka kwechimiro, uye nzvimbo dzakakura dzepamusoro, zvichiita kuti ive yekutanga tsigiro yerutsigiro inoshandiswa zvakanyanya mupetroleum kunatsa hydroprocessing, mota catalytic converters, uye yakaoma makemikari synthesis maitiro. Nekunyatso kudzora maparamendi ekunaya, mamiriro ekuchembera, uye hydrothermal kugadzirisa kwe boehmite precursors, vagadziri vemakemikari vanogona kunyatsogadzirisa pore vhoriyamu, avhareji pore saizi kugovera, mechanical kupwanya simba, uye acidic pamusoro nzvimbo kusangana nekuomarara zvinodiwa zvemazuva ano heterogeneous catalysis.

Advanced Applications muEnergy Storage

Mumakore achangopfuura, boehmite yakawana irikuchimbidza, -zvekushandisa tekinoroji yepamusoro muchikamu chekuchengetedza simba repasi rose, sechishandiso chepamusoro chekunamira zvitsauriso mumabhatiri e lithium-ion nesodium{2}}. Nekuda kwekudzikama kwayo kwemafuta, zvivakwa zvemagetsi zvakanakisa, murazvo{4}}unoramba uchinonoka, uye kusasimba kwekemikari, ultra-fine synthetic boehmite poda yakaputirwa sedhaka rakatetepa redhaka pazviparadzanisa zvebhatiri repolymer. Iyi inodzivirira inorganic coating inodzivirira kupera kweparator, mukati mapfupi maseketi, uye kupisa kwemhepo mukati me-tembiricha yekushushikana, overcharging, kana zvipikiri{8}}zvipikiri zvekupinda, zvichiwedzera kuchengetedzeka, kuvimbika, uye hupenyu hwemabhatiri emotokari yemagetsi, grid{{9}, masisitimu emagetsi anotakurika.

Flame Retardancy uye Nanomaterial Synthesis

Pamusoro pekuchengetedza simba uye catalysis, boehmite iri kuramba ichishandiswa seeco{{0}hushamwari, halogen{1}yemahara inodzoreredza moto mumoto{2}mumapurasitiki einjiniya epamusoro, akadhindwa bhodhi relaminates, uye zvekuvakisa zvemhando yepamusoro. Kana yakasanganiswa mumapolymers pakurodzwa kwemafuta akakwira, kupera kwayo kwekupedzisira kwemvura kunotora kupisa kwakadzika uye kunonyungudutsa inopisa pyrolysis magasi panguva yechiitiko chemoto. Pamusoro pezvo, ma synthetic boehmite nanoparticles anoshandiswa zvakanyanya seanosimbisa mafirita mumapolymer nanocomposites, anokwenya-resistant optical coatings, uye ceramic filtration membranes, zvichitaridza shanduko inoshamisa kubva mumigodhi kuenda kune yazvino technology inofambisira mberi{6}

6. Mhedziso

Boehmite (AlO(OH)) yakabudirira kudarika tsananguro yayo yechinyakare sekungove kusachena kusingadiwe bauxite kana chigadziro chemigodhi kuti ive chinhu chekona muinjiniya yemakemikari epamberi, sainzi yemidziyo, uye tekinoroji yemazuva ano. Yayo yakasarudzika orthorhombic crystal chimiro, inoratidzwa nerobust interlayer hydrogen bonding, inopa yakasarudzika yekudziya kugadzikana uye inofanotaurwa zvakanyanya chikamu shanduko nzira. Yakasanganiswa nenzvimbo yayo yepamusoro yepamusoro, amphoteric pamusoro chemistry, uye akasiyana-siyana colloidal zvivakwa, boehmite inogonesa kwakakosha kufambira mberi kwetekinoroji munzvimbo dzakasiyana dzemaindasitiri. Kubva pakushanda semutanho wekutanga wepamusoro-rutsigiro rwekuita basa rekushanda sechinhu chakakosha chekuchengetedza mu lithium-mabhatiri eion uye eco-asingaregi moto mumoto muma polymers akagadzirwa, boehmite inoratidza kuti foundational mineralogy inoenderera mberi ichikurudzira nekufambisa kuvandudzwa kweindasitiri yemazuva ano.