Abstract:
There are provided processes for decomposing AlCl 3 •6H 2 O into γ-Al 2 O 3 that comprise heating the AlCl 3 •6H 2 O at a temperature of about 600°C to about 800°C in the presence of steam and optionally at least one gas (for example chosen from air, argon, nitrogen, carbon dioxide, hydrogen and hydrochloric acid), under conditions suitable to obtain the γ-Al 2 O 3 . For example, the γ-Al 2 O 3 obtained can be suitable for use in an aluminum smelting process or optionally for processes for treating the γ-Al 2 O 3 to obtain high purity alumina, fused alumina, transition alumina, tabular alumina, calcined alumina, ultra-pure alumina or specialty alumina.
Abstract translation:提供了将AlCl 3·6H 2 O分解成γ-Al 2 O 3的方法,其包括在蒸汽和任选的至少一种气体(例如选自空气)的情况下,在约600℃至约800℃的温度下加热AlCl 3·6H 2 O ,氩气,氮气,二氧化碳,氢气和盐酸)中,在适于获得γ-Al 2 O 3的条件下进行。 例如,所得到的γ-Al 2 O 3可适用于铝冶炼工艺,也可适用于处理γ-Al2O3以获得高纯度氧化铝,熔融氧化铝,过渡型氧化铝,片状氧化铝,煅烧氧化铝,超纯氧化铝 或特种氧化铝。
Abstract:
There is provided a process for purifying aluminum ions comprising: reacting an aluminum-containing material with an acid so as to obtain a composition comprising aluminum ions; precipitating said aluminum ions in the form of AlCl 3 ; optionally converting AlCl 3 into Al(OH) 3 ; and heating said AlCl 3 or said Al(OH) 3 under conditions effective for converting AlCl 3 or Al(OH) 3 into Al 2 O 3 and optionally recovering gaseous HCl so-produced. Aluminum ions so purified are thus useful for preparing various types of alumina.
Abstract:
There are provided processes for converting alumina into α-Al 2 O 3 or transition alumina that comprise heating the alumina at a temperature of about 900° C to about 1200° C in the presence of steam and optionally at least one gas under conditions suitable to obtain the α-Al 2 O 3 or transition alumina. For example, the alumina can comprise a transition alumina (such as γ -Al 2 O 3 ), an amorphous alumina or a mixture thereof.
Abstract translation:提供了将氧化铝转化为α-Al 2 O 3或过渡型氧化铝的方法,其包括在蒸汽和任选的至少一种气体的存在下,在约900℃至约1200℃的温度下,在适于获得α -Al2O3或过渡氧化铝。 例如,氧化铝可以包含过渡氧化铝(例如γ-Al 2 O 3),无定形氧化铝或其混合物。