Process for reclaiming aluminum from waste paper and packaging products
    2.
    发明授权
    Process for reclaiming aluminum from waste paper and packaging products 失效
    从废纸和包装产品中回收铝的工艺

    公开(公告)号:US5456739A

    公开(公告)日:1995-10-10

    申请号:US175154

    申请日:1993-12-23

    IPC分类号: C01F7/74

    CPC分类号: C01F7/741

    摘要: Aluminum is recovered from organic waste paper and packaging material containing aluminum foil by heating the waste material in a kiln or other such device to decompose the organic constituents in the waste material, preferably by pyrolysis, producing hot gaseous by-products with a carbonaceous ash residue containing aluminum. The ash residue is contacted with an aqueous solution of sulfuric acid under conditions which cause the aluminum to react with the sulfuric acid to produce aluminum sulfate. Preferably, the ash/acid contacting is carried out with a relatively dilute sulfuric acid solution and at an elevated temperature in the range of from about 80.degree. C. to about 100.degree. C. to produce Al.sub.2 (SO.sub.4).sub.3.18H.sub.2 O as the reaction product.

    摘要翻译: 从有机废纸和含有铝箔的包装材料中回收铝,通过在窑炉或其它这样的装置中加热废料来分解废料中的有机成分,优选通过热解,产生具有碳质灰渣的热气态副产物 含铝。 在使铝与硫酸反应生成硫酸铝的条件下,灰渣与硫酸水溶液接触。 优选地,灰分/酸接触用相对稀的硫酸溶液进行,并且在约80℃至约100℃的升高温度下进行,以产生作为反应产物的Al 2(SO 4)3.18H 2 O 。

    Recovery of aluminum and other metal values from fly ash
    3.
    发明授权
    Recovery of aluminum and other metal values from fly ash 失效
    从飞灰中回收铝和其他金属值

    公开(公告)号:US4252777A

    公开(公告)日:1981-02-24

    申请号:US090175

    申请日:1979-11-01

    摘要: The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid-leachable form.

    摘要翻译: 本文描述的本发明涉及一种改善在煤灰中发现的铝和其它金属值的酸浸出性的方法,该方法包括在酸浸出之前,在含硫酸钙的组合物中在硫酸钙的温度下烧结飞灰 在烧结期间保留在所述组合物中,并且足以将所述飞灰中的铝定量转化为酸可浸出形式的时间。

    Aluminum sulfate manufacture from aluminum dross tailings
    7.
    发明授权
    Aluminum sulfate manufacture from aluminum dross tailings 失效
    由铝渣渣生产的硫酸铝

    公开(公告)号:US4320098A

    公开(公告)日:1982-03-16

    申请号:US221380

    申请日:1980-12-30

    IPC分类号: C01F7/74 C22B21/00

    摘要: There is disclosed a method for the elimination of the chief impurities in aluminum dross tailings. The method can be used as a pretreatment in the manufacture of aluminum sulfate from aluminum dross tailings in a continuous flow reaction zone in which the dross tailings prior to reaction with sulfuric acid are pretreated to reduce the more objectionable contaminants contained therein to acceptable levels. The most objectionable contaminant in the dross tailings is aluminum metal which, in the invention, is oxidized with water or steam at elevated temperatures. The dross tailings, which are chiefly particles of aluminum oxide, are suspended in an aqueous slurry and the slurry is heated to a temperature from 185.degree.-225.degree. F. and maintained under liquification pressures and sufficient agitation to insure particle-to-particle attrition that removes an aluminum hydroxide coating which would otherwise inhibit the reaction.

    摘要翻译: 公开了一种消除铝渣渣中主要杂质的方法。 该方法可用作在连续流动反应区中从铝渣渣生产硫酸铝中的预处理,其中在与硫酸反应之前的浮渣尾部被预处理以将包含在其中的更令人反感的污染物减少到可接受的水平。 浮渣尾矿中最令人反感的污染物是铝金属,其在本发明中在高温下被水或蒸汽氧化。 将主要是氧化铝颗粒的浮渣尾料悬浮在含水浆料中,将浆料加热到185-225°F的温度,并保持在液化压力和足够的搅拌下以确保颗粒到颗粒的磨耗 其除去否则会抑制反应的氢氧化铝涂层。

    Process for manufacturing aluminum sulfate
    10.
    发明授权
    Process for manufacturing aluminum sulfate 失效
    硫酸铝制造工艺

    公开(公告)号:US3925532A

    公开(公告)日:1975-12-09

    申请号:US44112874

    申请日:1974-02-11

    IPC分类号: C01F7/74

    CPC分类号: C01F7/741

    摘要: There is disclosed a process for manufacturing high purity aluminum sulfate by reacting aluminum containing metal impurities with sulfuric acid in the presence of liquid mercury. During the reaction period, the metallic impurities in the aluminum are absorbed into the mercury and the aluminum sulfate produced. The impurity containing mercury is thereafter separated from the aluminum sulfate product. If further desired the impurities may be separated from the mercury and the thus purified mercury is, in a preferred embodiment, recycled to the reaction zone.

    摘要翻译: 公开了在液态汞存在下使含铝金属杂质与硫酸反应来制造高纯度硫酸铝的方法。 在反应期间,铝中的金属杂质被吸收到汞中并产生硫酸铝。 然后从硫酸铝产品中分离出含有汞的杂质。 如果进一步需要,杂质可以与汞分离,并且在一个优选的实施方案中,由此纯化的汞被再循环到反应区。