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48 条记录 (耗时 0.026 秒)

    Production of high purity alumina
    31.
    发明授权
    Production of high purity alumina 失效
    生产高纯氧化铝

    公开(公告)号：US4634581A

    公开(公告)日：1987-01-06

    申请号：US826468

    申请日：1986-02-05

    申请人： Edward L. Cambridge ,  Raouf O. Loutfy ,  James C. Withers ,  Daniel M. Blake

    发明人： Edward L. Cambridge ,  Raouf O. Loutfy ,  James C. Withers ,  Daniel M. Blake

    IPC分类号： C01F7/30 ,  C01F7/46

    CPC分类号： C01F7/306 ,  C01F7/46 ,  C01P2006/80

    摘要： A process is described for the formation of high purity alumina from Bayer Process alumina trihydrate (gibbsite). The solid hydrated alumina is reacted with concentrated HCl to cause partial or complete conversion to aluminum chloride hexahydrate (ACH). The ACH or mixture of ACH and unreacted hydrated alumina is recovered as a solid and calcined in a single or multistage calcination to high purity alumina. Soda contents in the product anhydrous alumina can be reduced by 98% or greater. Contents of other impurities, such as silica, iron, magnesium, etc., are also markedly reduced. Different degrees of impurity reduction can be obtained by controlling the degree of conversion of the hydrated alumina to ACH and by recycling and treating the acid after solid/liquid separation. The purified products find use in the specialty ceramics field, as catalyst supports, as adsorbents, in electronic components, in prosthetic devices or other applications in which alumina of controlled degrees of purity offers an advantage.

    摘要翻译： 描述了从拜耳法氧化铝三水合物（三水铝矿）形成高纯度氧化铝的方法。 固体水合氧化铝与浓HCl反应，使部分或完全转化为氯化铝六水合物（ACH）。 将ACH或ACH与未反应的水合氧化铝的混合物作为固体回收并在单次或多步煅烧中煅烧成高纯度氧化铝。 产品无水氧化铝中的纯碱含量可降低98％以上。 其他杂质如二氧化硅，铁，镁等的含量也明显降低。 通过控制水合氧化铝向ACH的转化程度和固/液分离后的酸的再循环和处理可以获得不同程度的杂质减少。 纯化的产品可用于特种陶瓷领域，作为催化剂载体，作为吸附剂，电子部件，假体装置或其中可控制度的氧化铝具有优点的其他应用。

    Production of anhydrous aluminum chloride from hydrated alumina
    32.
    发明授权
    Production of anhydrous aluminum chloride from hydrated alumina 失效
    从水合氧化铝生产无水氯化铝

    公开(公告)号：US4559215A

    公开(公告)日：1985-12-17

    申请号：US519795

    申请日：1983-08-03

    申请人： Raouf O. Loutfy ,  James C. Withers

    发明人： Raouf O. Loutfy ,  James C. Withers

    IPC分类号： C01F7/56 ,  C01F7/60 ,  C01F7/58

    CPC分类号： C01F7/60 ,  C01F7/56

    摘要： A process is described for the direct chlorination of hydrated alumina (preferably alumina trihydrate) to aluminum chloride hexahydrate (ACH) by reaction with concentrated hydrochloric acid. Preferably all of the initial hydrated alumina is converted to ACH. The ACH partially calcined to form an amorphous mixture of aluminum oxides and oxychlorides. This mixture is then reductively chlorinated to form anhydrous aluminum chloride which is suitable as a source of electrolytically produced aluminum metal.

    摘要翻译： 描述了通过与浓盐酸反应直接将水合氧化铝（优选三水合氧化铝）氯化为氯化铝六水合物（ACH）的方法。 优选将所有初始水合氧化铝转化为ACH。 ACH部分煅烧以形成氧化铝和氯氧化物的无定形混合物。 然后将该混合物还原氯化以形成适合作为电解生产的铝金属的来源的无水氯化铝。

    Method of using a thermal plasma to produce a functionally graded composite surface layer on metals
    39.
    发明授权
    Method of using a thermal plasma to produce a functionally graded composite surface layer on metals 有权
    使用热等离子体在金属上产生功能梯度复合表面层的方法

    公开(公告)号：US08203095B2

    公开(公告)日：2012-06-19

    申请号：US11735939

    申请日：2007-04-16

    申请人： Roger S. Storm ,  Vladimir Shapovalov ,  James C. Withers ,  Raouf Loutfy

    发明人： Roger S. Storm ,  Vladimir Shapovalov ,  James C. Withers ,  Raouf Loutfy

    IPC分类号： B23K10/00

    CPC分类号： C23C8/24 ,  C23C8/36 ,  C23C26/00

    摘要： A method of material treatment in which the surface of a metal substrate is converted to a composite structure of the metal and its nitride or carbide utilizing a high temperature chemically active thermal plasma stream, and the product obtained from that method. The complex thermal plasma contains controllable additions of active gas, liquid or solid substances. The surface layer obtained is functionally graded to the substrate resulting in an excellent bond that resists delamination and spalling, and provides a significant increase in hardness, wear and erosion resistance, and corrosion resistance, and a decrease in coefficient of friction.

    摘要翻译： 一种材料处理方法，其中使用高温化学活性热等离子体流将金属基材的表面转化为金属及其氮化物或碳化物的复合结构，以及从该方法获得的产品。 复杂的热等离子体包含可控添加的活性气体，液体或固体物质。 所获得的表面层在功能上分级到基材，导致优异的粘合，抵抗剥离和剥落，并且显着提高硬度，耐磨性和耐冲蚀性，耐腐蚀性以及摩擦系数的降低。