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    ALUMINA PRODUCTION PROCESS
    1.
    发明申请
    ALUMINA PRODUCTION PROCESS 审中-公开
    氧化铝生产工艺

    公开(公告)号：US20120003130A1

    公开(公告)日：2012-01-05

    申请号：US12863916

    申请日：2008-01-22

    申请人： Giorgio Vidili

    发明人： Giorgio Vidili

    IPC分类号： C01F7/02

    CPC分类号： C01F7/0613 ,  C01F7/14 ,  C01P2006/22

    摘要： An improved process for producing alumina from bauxite is disclosed comprising the steps of: a) wet grinding of the bauxite in the presence of an agent capable of reducing the viscosity of the semiliquid paste obtained; b) caustic etching of the bauxite ground in step a) with a concentrated solution of sodium hydroxide until a liquid phase is obtained comprising aluminium hydroxide and a solid phase; c) removal of the solid phase formed in step b) from the liquid phase; d) precipitation of the aluminium hydroxide from the liquid phase of step c); e) filtration of the aluminium hydroxide precipitated in step d); and f) calcination of the aluminium hydroxide of step e).

    摘要翻译： 公开了一种用于从铝土矿生产氧化铝的改进方法，包括以下步骤：a）在能够降低所获得的半液态糊料的粘度的试剂存在下，对铝土矿进行湿法研磨; b）在步骤a）中用浓氢氧化钠溶液苛化蚀刻铝土矿，直至得到包含氢氧化铝和固相的液相; c）从液相中除去步骤b）中形成的固相; d）从步骤c）的液相中沉淀出氢氧化铝; e）过滤步骤d）中沉淀的氢氧化铝; 和f）煅烧步骤e）的氢氧化铝。

    The bayer process for production of alumina trihydrate by alkaline digestion of bauxite, the process comprising a predesilication step
    2.
    发明申请
    The bayer process for production of alumina trihydrate by alkaline digestion of bauxite, the process comprising a predesilication step 失效
    通过铝土矿的碱性消解生产氧化铝三水合物的拜耳法，该方法包括预消溶步骤

    公开(公告)号：US20070178041A1

    公开(公告)日：2007-08-02

    申请号：US11569290

    申请日：2005-05-11

    申请人： Eric Tizon ,  Clotilde Fryns

    发明人： Eric Tizon ,  Clotilde Fryns

    IPC分类号： C01F7/02

    CPC分类号： C01F7/47 ,  C01F7/0613 ,  C01F7/062

    摘要： Bayer process, comprising grinding (L, B) and then digestion (N2, A) of a bauxite by bringing it into contact with a sodium aluminate liquor (20b, 120b). Digestion consists of forming a slurry (3a, 103) that is then treated to separate insoluble residues (5a, 105a) from the sodium aluminate liquor. The liquor is then crystallized (D) and recycled back to green liquor (20, 120) after having been separated from the alumina trihydrate (11, 111) precipitated during crystallization. The process comprises a predesilication treatment (P) during which the ground bauxite is brought before digestion into contact with an aqueous sodic solution that has a content of carbonates, sulphates and possibly chlorides which, expressed as a percentage related to the caustic concentration, is less than half the corresponding impurities content of the spent liquor (8, 108). Preferably, the pure caustic soda used to compensate for caustic soda losses in the Bayer circuit that was previously injected just after evaporation is now added in the aqueous sodic solution for the predesilication treatment.

    摘要翻译： 拜耳法，其包括通过使其与铝酸钠液体（20b，120b）接触来研磨（L，B）然后消化铝土矿（N 2，A）。 消化物包括形成浆液（3a，103），然后将其从铝酸钠液体中分离出不溶性残留物（5a，105a）。 然后在从结晶中沉淀的三水合氧化铝（11,111）中分离出液体之后，将液体结晶（D）并循环回绿液（20,120）。 该方法包括预消解处理（P），在该预处理处理（P）期间，研磨的铝土矿在消化之前与具有含碳酸盐，硫酸盐和可能的氯化物的水溶液接触，其以与苛性碱浓度相关的百分比表示，较少 超过废液的相应杂质含量的一半（8,108）。 优选地，用于补偿先前在蒸发之后注入的拜耳回路中的苛性钠损失的纯苛性钠现在被加入用于预溶解处理的水溶液中。

    Transfer of slurry in a bayer process
    4.
    发明授权
    Transfer of slurry in a bayer process 有权
    在拜耳过程中转移浆料

    公开(公告)号：US08628737B2

    公开(公告)日：2014-01-14

    申请号：US11558205

    申请日：2006-11-09

    申请人： Everett C. Phillips ,  Michael G. Strominger ,  Peter A. Dimas

    发明人： Everett C. Phillips ,  Michael G. Strominger ,  Peter A. Dimas

    IPC分类号： C01F1/00 ,  C01F7/04

    CPC分类号： C01F7/0613 ,  C01F7/066

    摘要： The present disclosure is directed to a method of improving the transfer of slurry in a Bayer process through the addition of one or more chemical species to a Bayer process, wherein said chemical species is selected from the group consisting of: non-ionic surfactants, polyglycols, polyglycol ethers, anionic surfactants, anionic polymers, and a combination thereof. The present invention is also directed to a method of deaerating a slurry in a Bayer process through the addition of an effective amount of one or more chemical species to a Bayer process, wherein said chemical species is selected from the group consisting of: non-ionic surfactants, polyglycols, polyglycol ethers, anionic surfactants, anionic polymers, and a combination thereof.

    摘要翻译： 本公开涉及通过将一种或多种化学物质添加到拜耳法来改进拜耳法中浆料的转移的方法，其中所述化学物质选自：非离子表面活性剂，聚二醇 ，聚乙二醇醚，阴离子表面活性剂，阴离子聚合物及其组合。 本发明还涉及通过向拜耳法加入有效量的一种或多种化学物质来进行拜耳法中的浆料脱气的方法，其中所述化学物质选自：非离子的 表面活性剂，聚二醇，聚乙二醇醚，阴离子表面活性剂，阴离子聚合物及其组合。

    Bauxite processing
    5.
    发明授权
    Bauxite processing 失效
    铝土矿加工

    公开(公告)号：US5279645A

    公开(公告)日：1994-01-18

    申请号：US910057

    申请日：1992-07-08

    申请人： Albert Rijkeboer

    发明人： Albert Rijkeboer

    IPC分类号： C01F7/06 ,  C22B1/02

    CPC分类号： C01F7/0613

    摘要： An improved process for the removal of organic matter from bauxite ore containing gibbsite comprises heating the ore under roasting conditions including a roasting temperature of from about 400.degree. C. to about 600.degree. C. with oxygen-containing roasting gas having a moisture content of less than 1% by volume water until the water of crystallization of the alumina present in the treated product is less than 0.5 mole per mole of alumina.

    摘要翻译： 用于从含有三水铝矿的铝土矿矿石中除去有机物的改进方法包括在焙烧条件下对矿石进行加热，包括焙烧温度为约400摄氏度至约600摄氏度，含有含水量较低的含氧焙烧气体 直到处理产物中存在的氧化铝的结晶水低于每摩尔氧化铝0.5摩尔为止的水含量为1体积％。

    Production of alumina from gibbsite-bearing bauxite of low reactive silica content
    6.
    发明授权
    Production of alumina from gibbsite-bearing bauxite of low reactive silica content 失效
    从含有低活性二氧化硅含量的含三水铝矿的铝土矿生产氧化铝

    公开(公告)号：US4650653A

    公开(公告)日：1987-03-17

    申请号：US857316

    申请日：1986-04-30

    申请人： Jean Lepetit ,  Jacques Mordini

    发明人： Jean Lepetit ,  Jacques Mordini

    IPC分类号： C01F7/06 ,  C01F7/46 ,  C01F7/47

    CPC分类号： C01F7/46 ,  C01F7/0613 ,  C01F7/062 ,  C01F7/47

    摘要： Process for the low-temperature treatment according to the Bayer cycle of gibbsite-bearing bauxite of low reative silica content, involving desilication of the said bauxite before leaching, by a liquor of low caustic soda concentration and characterized in that this sodium liquor consists of one or more washing waters originating from the Bayer cycle, mixed or otherwise with leaching liquor, wherein the weighted reactive silica content is preferably lower than 5% of the alumina content of the bauxite and the concentration of the sodium liquor used for desilication ranges from 50 to 120 g/liter of Na.sub.2 O caustic.

    摘要翻译： 根据具有低二氧化硅含量的含三水铝矿的铝土矿的拜耳循环的低温处理方法，包括在浸出之前通过低苛性钠浓度的液体对所述铝土矿进行脱硅，并且其特征在于该钠液体由1个 或更多来自拜耳循环的洗涤水，混合或以其他方式与浸出液混合，其中加权的反应性二氧化硅含量优选低于铝土矿的氧化铝含量的5％，用于脱盐的钠液的浓度范围为50至 120克/升Na2O苛性碱。

    Bayer process for production of alumina trihydrate by alkaline digestion of bauxite, the process comprising a predesilication step
    9.
    发明授权
    Bayer process for production of alumina trihydrate by alkaline digestion of bauxite, the process comprising a predesilication step 失效
    通过铝土矿的碱性消解生产氧化铝三水合物的拜耳法，该方法包括预清洗步骤

    公开(公告)号：US07704471B2

    公开(公告)日：2010-04-27

    申请号：US11569290

    申请日：2005-05-11

    申请人： Eric Tizon ,  Clotilde Fryns

    发明人： Eric Tizon ,  Clotilde Fryns

    IPC分类号： C01F7/00

    CPC分类号： C01F7/47 ,  C01F7/0613 ,  C01F7/062

    摘要： A Bayer process comprises grinding and then digestion of bauxite by bringing it into contact with a sodium aluminate liquor. Digestion consists of forming a slurry that is then treated to separate insoluble residues from the sodium aluminate liquor. The liquor is then crystallized and recycled back to green liquor after having been separated from the alumina trihydrate precipitated during crystallization. The process comprises a predesilication treatment during which the ground bauxite, before digestion, is brought into contact with an aqueous sodic solution that has a content of carbonates, sulphates and possibly chlorides which, expressed as a percentage related to the caustic concentration, has less than half of the corresponding impurities content of the spent liquor. Preferably, the pure caustic soda used to compensate for caustic soda losses in the Bayer circuit, previously injected just after evaporation, is now added in the aqueous sodic solution for the predesilication treatment.

    摘要翻译： 拜耳方法包括通过使其与铝酸钠液体接触来研磨并随后消化铝土矿。 消化由形成浆料组成，然后将其处理以从铝酸钠液体中分离出不溶性残留物。 然后在结晶中沉淀出的三水合氧化铝被分离后，将液体结晶并循环回绿液。 该方法包括预清洗处理，其中在消化之前，研磨的铝土矿与含有碳酸盐，硫酸盐和可能的氯化物的水溶液接触，其以与苛性碱浓度相关的百分比表示，具有小于 废液中相应杂质含量的一半。 优选地，用于补偿先前在蒸发之后注入的拜耳回路中的苛性钠损失的纯苛性钠现在被加入用于预溶解处理的水溶液中。

    IMPROVING GRINDING IN A ALUMINA EXTRACTION PROCESS
    10.
    发明申请
    IMPROVING GRINDING IN A ALUMINA EXTRACTION PROCESS 有权
    改进铝氧化物萃取工艺中的研磨

    公开(公告)号：US20080289260A1

    公开(公告)日：2008-11-27

    申请号：US11754033

    申请日：2007-05-25

    申请人： Everett C. Phillips

    发明人： Everett C. Phillips

    IPC分类号： C09K3/14

    CPC分类号： C22B21/0007 ,  C01F7/0613 ,  C22B1/00

    摘要： The present disclosure pertains to a method of improving the grinding of a bauxite containing slurry during the grinding stage of an alumina extraction process. Specifically, an effective amount of one or more non-ionic surfactants, polyglycols, polyglycol ethers, anionic surfactants, anionic polymers, or a combination thereof are added to said bauxite containing slurry during the grinding stage of an alumina extraction process to achieve an improved effect.

    摘要翻译： 本公开涉及在氧化铝提取过程的研磨阶段期间改进含铝土矿浆料的研磨的方法。 具体地说，在氧化铝提取过程的研磨阶段，将有效量的一种或多种非离子表面活性剂，聚二醇，聚乙二醇醚，阴离子表面活性剂，阴离子聚合物或其组合加入到所述含铝土矿浆料中以达到改善效果 。