{"id":6620,"date":"2021-04-04T12:32:53","date_gmt":"2021-04-04T12:32:53","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6620"},"modified":"2021-04-12T06:48:56","modified_gmt":"2021-04-12T06:48:56","slug":"penjelasan-rinci-tentang-parameter-bubuk-alumina","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/id\/penjelasan-rinci-tentang-parameter-bubuk-alumina\/","title":{"rendered":"Penjelasan rinci tentang parameter bubuk alumina"},"content":{"rendered":"

Saat ini, dunia bubuk alumina<\/a> yang dihasilkan oleh proses Bayer menyumbang lebih dari 90% dari total produksi, yang sebagian besar digunakan untuk membuat logam aluminium, dan kurang dari 10% digunakan untuk tujuan lain.<\/p>\n

Bubuk alumina<\/a> adalah alumina, simbol kimia: Al2O3, berat molekul 102, alumina murni adalah bubuk amorf putih, umumnya dikenal sebagai bauksit, kepadatan 3,9-4.0g \/ cm3, titik leleh 2050 \u2103, titik didih 2980 \u2103, tidak larut dalam air, oksida amfoter, larut dalam asam anorganik dan larutan basa, ada empat alotrop \u03b2-alumina \u03b4-alumina v-alumina a-alumina, dan terutama ada dua varian tipe \u03b1 dan tipe \u03b3. Secara industri dapat diekstraksi dari bauksit.<\/p>\n

Dalam kisi kristal alumina tipe-\u03b1, ion oksigen dikemas secara padat dalam segi enam, dan Al3+ terdistribusi secara simetris di pusat koordinasi oktahedral yang dikelilingi oleh ion oksigen. Energi kisi besar, sehingga titik leleh dan titik didihnya tinggi. Alumina tipe-\u03b1 tidak larut dalam air dan asam. Ini juga disebut aluminium oksida dalam industri. Ini adalah bahan baku dasar untuk membuat logam aluminium. Ini juga digunakan untuk membuat berbagai batu bata tahan api, cawan lebur tahan api, tabung tahan api, dan instrumen uji suhu tinggi; itu juga dapat digunakan sebagai abrasif, penghambat api, pengisi, dll.; alumina tipe \u03b1 dengan kemurnian tinggi juga merupakan bahan baku untuk produksi korundum buatan, ruby buatan dan safir; itu juga digunakan untuk produksi sirkuit terintegrasi skala besar modern.<\/p>\n

Alumina tipe \u03b3 diproduksi melalui dehidrasi aluminium hidroksida pada suhu rendah 140-150\u00b0C. Alumina ini juga disebut alumina aktif dan lem aluminium dalam industri. Dalam strukturnya, ion oksigen kira-kira dikemas secara padat dalam bidang vertikal, dan Al3+ terdistribusi secara tidak teratur di dalam rongga oktahedral dan tetrahedral yang dikelilingi oleh ion oksigen. Alumina tipe \u03b3 tidak larut dalam air, tetapi dapat dilarutkan dalam asam kuat atau larutan alkali kuat. Ketika dipanaskan hingga 1200 \u2103, ia sepenuhnya diubah menjadi alumina tipe-\u03b1. Alumina tipe \u03b3 adalah bahan berpori, dengan luas permukaan internal hingga beberapa ratus meter persegi per gram, dengan aktivitas tinggi dan kapasitas adsorpsi yang kuat. Produk industri sering kali tidak berwarna atau partikel silinder agak merah muda dengan ketahanan tekanan yang baik. Ini biasanya digunakan adsorben, katalis dan pembawa katalis dalam penyulingan minyak bumi dan industri petrokimia; digunakan sebagai agen deasidifikasi untuk minyak transformator dan minyak turbin di industri; itu juga digunakan untuk analisis kromatografi; di laboratorium, ini adalah pengering kuat netral Kapasitas pengeringannya tidak kalah dengan fosfor pentoksida. Setelah digunakan, dapat diregenerasi dan digunakan kembali setelah dipanaskan pada suhu 175 \u00b0 C selama 6-8 jam.<\/p>","protected":false},"excerpt":{"rendered":"

At present, the world’s alumina powder produced by Bayer process accounts for more than 90% of the total output, most of which are used to make metal aluminum, and less than 10% are used for other purposes. Alumina powder is alumina, chemical symbol: Al2O3, molecular weight 102, pure alumina is white amorphous powder, commonly known 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